API Development is an effective way for software to communicate and interact with each other over the internet. It’s a great way for developers to expand the capabilities of a program or systems by creating interfaces and allow data to be shared between different types of technology. With an API, existing systems can connect and more advanced solutions can be made. Hiring an API Developer can enable businesses to streamline processes and enable a much faster integration of existing software solutions.

API Developers are skilled engineers specialized in creating new APIs and maintaining existing ones. They are responsible for developing and troubleshooting current APIs, designing APIs from standards-based web services, maintaining inventory and implementing authorization mechanisms. Additionally, they incorporate different technologies together to create advanced software solutions that integrate cloud systems like Amazon Web Services or MongoDB and APIs with point-and-click platforms, like WordPress or HubSpot.

Here’s some projects that our expert API Developer made real:

  • Creating advanced databases on different cloud systems
  • Linking between two cameras from a microscope
  • Interfacing with customizing Wordpress themes, Woocommerce themes and SMS services
  • Building secure back end systems to analyze different public APIs
  • Applying sophisticated authorization mechanisms
  • Creating comprehensive ecommerce websites using MERN Stack
  • Developing node APIs for exchange markets using Node.js, Web3.js, Ether.js
  • Automatically out of stocking items from supplier’s stock through an API system.

It is no surprise that good API Development is the cornerstone of many successful software solutions. Our expert API Developers are well experienced in developing suitable solutions for projects ranging from app development to SaaS applications, game development to enterprise system integrations. WithFreelancer.com, businesses can easily hire one of these skilled professionals to build their own bespoke projects that are perfectly tailored for their needs. So why not post your own project on Freelancer today and hire an expert API Developer?

从101,864个评价中,客户给我们的 API Developers 打了4.9,共5星。
雇佣 API Developers

API Development is an effective way for software to communicate and interact with each other over the internet. It’s a great way for developers to expand the capabilities of a program or systems by creating interfaces and allow data to be shared between different types of technology. With an API, existing systems can connect and more advanced solutions can be made. Hiring an API Developer can enable businesses to streamline processes and enable a much faster integration of existing software solutions.

API Developers are skilled engineers specialized in creating new APIs and maintaining existing ones. They are responsible for developing and troubleshooting current APIs, designing APIs from standards-based web services, maintaining inventory and implementing authorization mechanisms. Additionally, they incorporate different technologies together to create advanced software solutions that integrate cloud systems like Amazon Web Services or MongoDB and APIs with point-and-click platforms, like WordPress or HubSpot.

Here’s some projects that our expert API Developer made real:

  • Creating advanced databases on different cloud systems
  • Linking between two cameras from a microscope
  • Interfacing with customizing Wordpress themes, Woocommerce themes and SMS services
  • Building secure back end systems to analyze different public APIs
  • Applying sophisticated authorization mechanisms
  • Creating comprehensive ecommerce websites using MERN Stack
  • Developing node APIs for exchange markets using Node.js, Web3.js, Ether.js
  • Automatically out of stocking items from supplier’s stock through an API system.

It is no surprise that good API Development is the cornerstone of many successful software solutions. Our expert API Developers are well experienced in developing suitable solutions for projects ranging from app development to SaaS applications, game development to enterprise system integrations. WithFreelancer.com, businesses can easily hire one of these skilled professionals to build their own bespoke projects that are perfectly tailored for their needs. So why not post your own project on Freelancer today and hire an expert API Developer?

从101,864个评价中,客户给我们的 API Developers 打了4.9,共5星。
雇佣 API Developers

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    I earn revenue from reward programs that credit me each time an advertisement is fully viewed on YouTube. What I need is a dependable solution that can watch roughly 1,000 ads per day on that platform without raising red flags or violating YouTube’s policies. Here is what matters to me: • Every view must register as a complete ad watch on YouTube so the reward platform credits the event. • The process has to run hands-free once it is set up—no daily babysitting on my side. • My personal YouTube account must stay safe. I cannot afford any strikes, bans, or suspicious activity notices. • A basic dashboard or log that shows how many ads were viewed in the last 24 hours is essential so I can verify performance. I am flexible on how you achieve this. ...

    $78 / hr Average bid
    $78 / hr 平均报价
    1 个竞标

    I'm seeking an experienced Android developer to finish up my app. The project involves enhancing the user interface, completing backend functionality, and thorough testing and debugging. Key Tasks: - User Interface: Improve and finalize the app's UI for a better user experience. - Backend Functionality: - API Development: Create and integrate necessary APIs. - User Authentication: Set up secure user authentication methods. - Testing and Debugging: Identify and fix bugs, ensure app stability and performance. 1. App purpose Build a TikTok Operations OS that: - Standardizes ideation, approvals, production, post-mortems, and analytics. - Implements the existing “TikTok Music Virality Playbook” as a living system. - Supports roles: Creator, Editor, Social Manag...

    $3720 Average bid
    $3720 平均报价
    156 个竞标

    ABOUT US We are a small automation business with five working Python services, each running in Docker. The code currently exists in only one place, without version history or a reliable backup. We want to organize it properly in GitHub before building anything new. We are not programmers. Clear, plain-English documentation matters as much as the technical work. SCOPE OF WORK We will provide the source code directly. No production-server access or live credentials are required. You will: Create four private repositories in our GitHub organization—one for each service. Organize each service into a clean, sensible structure. Add the correct .gitignore, dependency files, Docker files, and an . with placeholders. Check for passwords, tokens, API keys, .env files, and other ...

    $322 Average bid
    $322 平均报价
    107 个竞标

    I’m building a responsive web platform that puts an online bookstore—both physical titles and ebooks—at its heart and then layers in a set of everyday utility services. The first release must pair a clean, mobile-first UI with a smooth shopping experience: catalog browsing, advanced search, product detail pages, a full shopping cart, and a wishlist that users can save across devices. Buyers will check out through an integrated payment gateway, pay with an on-site wallet, and earn cashbacks that appear instantly in their account. Order history needs to update in real time, while SMS and WhatsApp push every key status change automatically. Beyond books, the site will let users recharge phones, settle utility bills, book bus seats, and reserve IRCTC train tickets—all ...

    $71 / hr Average bid
    $71 / hr 平均报价
    49 个竞标

    I need a fully custom-built business website that goes beyond a simple brochure and includes core e-commerce capabilities: a secure payment gateway and an intuitive product search with robust filtering. I am not looking for a WordPress or Shopify solution—I want clean, maintainable code written from the ground up so I am free of template constraints and monthly platform fees. Key deliverables: • End-to-end design and development of a modern, responsive business site • Seamless payment gateway integration (PCI-compliant, major cards + wallets) • Fast, accurate search and filter functionality for my product catalogue • Admin dashboard where I can add or edit products, prices, and inventory • Deployment to my hosting environment with basic docum...

    $1805 Average bid
    $1805 平均报价
    88 个竞标

    Professional Software Development Team Wanted We are looking for an experienced and reliable Software Development Team / Company to build a professional, secure, and scalable Educational Live Learning Platform. Project Scope Website & Web Platform iOS & Android Applications Windows & macOS Support Live Classes System integrated with Agora, , or similar solutions OTP Verification & Authentication Payment Gateway Integration Booking, Scheduling & Calendar System Student, Teacher & Admin Dashboards Notifications & Reminders Reports, Progress Tracking & Management System Backend, Database & Cloud Infrastructure Recorded content is not a priority at this stage, but the architecture must be scalable and ready to support recorded courses and additional feat...

    $20905 Average bid
    $20905 平均报价
    144 个竞标

    I want a lightweight, web-based tool that helps me stay on top of project tasks from start to finish. The core of the system is a clean LIST VIEW where I can: • create and assign tasks to specific team members, • set due dates with automatic reminders, and • record quick progress updates that are easy to scan at a glance. If a task changes hands or a deadline shifts, editing should be frictionless and instantly reflected for everyone. I do not need Kanban columns or a full Gantt timeline—just a fast, searchable list that can be filtered by assignee, status, or due date. A straightforward dashboard, email or in-app notifications, and the ability to export data (CSV or similar) would round things out nicely. I’m open to the underlying stack as long as it’...

    $259 / hr Average bid
    $259 / hr 平均报价
    137 个竞标

    Our hotel needs a modern, conversion-focused website whose single purpose is to turn visitors into confirmed guests. The site must be built around a fully custom reservation system rather than a plug-in or third-party widget. Key elements I expect from that system: • Real-time availability tied to each room type, so guests never encounter double-booking issues. • Integrated payment gateway for instant, secure card processing. • Automated booking-confirmation emails & WhatsApp messages triggered immediately after payment. • An interactive, filterable room catalogue that showcases each category with photos, rates and key amenities. * To display nearby attractions & popular eateries Beyond the booking engine, the rest of the site should load quickly on ...

    $887 Average bid
    $887 平均报价
    49 个竞标
    C# Revit Rebar Automation
    6 天 left
    已验证

    I need a focused C# add-in that taps straight into the Autodesk Revit API to automate rebar placement. The goal is simple: with a single command the plug-in should populate beams, columns, and walls with the correct bar sizes, counts, and spacing based on user-defined parameters or templates, saving the manual layout work our team currently performs. Core workflow I have in mind • User selects the structural elements (or the active view) • A settings dialog lets them pick the bar family, cover, spacing rules, and any lap or hook options • The routine then generates the bars, respecting host geometry, covers, and clashes, and updates instantly if the host member changes Acceptance criteria • Written in C# using Revit 2023+ API • Clean, well-commented cod...

    $298 Average bid
    $298 平均报价
    5 个竞标

    I want to launch a complete e-commerce solution that works seamlessly on the web, iOS, and Android. The project begins with a clean, modern UI: intuitive menus, fast product search, and a checkout flow that feels effortless on any screen size. Every page needs to be fully responsive so shoppers who start on desktop can continue on a phone without missing a beat. For the mobile side, I need native-like performance on both iOS and Android, whether you prefer Flutter, React Native, or another cross-platform approach. Push notifications, secure in-app payments, and deep linking should be baked in from day one. On the web, the same feature set must be available—product catalogue, user accounts, wish-lists, reviews, and a robust admin dashboard for inventory, orders, and analytics. Secur...

    $71 / hr Average bid
    $71 / hr 平均报价
    73 个竞标

    OBD Calling App + Web Admin Panel – Full Source Code Required I need a developer to build a complete OBD (Outbound Dialer) Calling System for business use. The project must include: - Android App - Web Admin Panel - Backend/API - Database - OBD/Cloud Telephony API Integration - IVR/DTMF Response System - Lead & Customer Management - Telecaller Module - Complete Reports - Notifications - Full editable source code Main Requirement Admin should be able to upload customer mobile numbers through Excel/CSV and run automated outbound voice-call campaigns. The system should: - Automatically call uploaded customers through an approved OBD/cloud telephony provider - Play prerecorded voice messages - Detect answered, busy, no-answer and failed calls - Capture call duration - Capture ...

    $1122 Average bid
    $1122 平均报价
    32 个竞标

    I need a straightforward system that lets us follow every 5-gallon / 20 L bottle from the moment it leaves our factory until it comes back again. Each container already carries a permanent QR code such as “BTL-000127”, so the job is to capture those scans and turn them into clear, actionable data. Scope of work • Web dashboard – a browser-based control centre where I can see, at a glance, where every bottle is, which customer it is linked to, its full scan history, and any units that are overdue, lost, or marked damaged. • Mobile application – the drivers’ tool for scanning and assigning bottles while they are on the road. This must run on both iOS and Android, work with the phone’s camera QR reader, and allow quick offline capture that sy...

    $1601 Average bid
    $1601 平均报价
    116 个竞标

    Tôi cần một đoạn script giúp tự động hoá các tác vụ trên website. Trọng tâm là “Automating tasks” nên mã phải gọn, dễ triển khai và chạy ổn định ngay cả trên hosting phổ thông. Những gì tôi mong đợi: • Mã nguồn đầy đủ kèm hướng dẫn cài đặt từng bước. • Tài liệu cấu hình để tôi tự chỉnh sửa các tham số khi cần. • Ghi rõ mọi thư viện, API hoặc cron job sử dụng. Bạn có thể viết bằng PHP, Python hoặc JavaScript server-side tuỳ kinh nghiệm, miễn sao không làm chậm trang và dễ bảo trì. Ưu tiên những bạn đã từng xây dựng automation cho website và c&oacut...

    $298 Average bid
    $298 平均报价
    38 个竞标
    Complete assessment
    6 天 left
    已验证

    I have an online assessment . PALS to take with sections and questions.

    $157 Average bid
    $157 平均报价
    51 个竞标

    I need the daily outbound quota of my registered WhatsApp Business API number lifted from the current 100 k ceiling to the maximum tier Meta allows (ideally “unlimited”). The work concerns sending only; incoming traffic is already handled smoothly. The phone number is a single, fully verified WABA line that sits inside an active Meta Business Manager, and we already run approved message templates and signature‐based authentication on every call to /messages. Your task is to analyse our present setup, determine the quickest compliant route to the top-tier limit, and execute the required steps—whether that involves sending the additional quality/volume signals Meta’s system expects, submitting further documents, coordinating with a BSP, or optimising our existing Clo...

    $3359 Average bid
    $3359 平均报价
    57 个竞标

    I need an embedded-software specialist who can take my collection of Wi-Fi and LoRaWAN gateways and assorted sensors and knit them into a single, production-ready IoT platform. The job covers the full stack from firmware that runs on the edge devices through to the application layer that users will see. Core capabilities the platform must deliver: • Data collection from every gateway and sensor • Robust device management (on-boarding, remote configuration, OTA updates) • Built-in analytics so I can visualise trends and run simple rules without exporting data elsewhere You’ll be free to recommend languages, embedded RTOS options, and cloud back-ends, provided they reliably handle both Wi-Fi and LoRaWAN traffic and scale cleanly as more hardware is added. De...

    $2189 Average bid
    $2189 平均报价
    26 个竞标

    I’m building a fully automated rice-mill and need a cross-platform mobile application that lets me observe the plant in real time. The current phase is strictly Monitoring; the framework, however, should be flexible enough to accommodate future Control and Reporting extensions. Core data streams to visualise: • Machine performance (uptime, temperature, speed, etc.) • Production statistics (throughput, yield, rejects) • Energy consumption (per machine and overall) The app must compile for both iOS and Android from a single code base—Flutter, React Native or a comparable toolkit is fine—presenting intuitive dashboards, trend charts and push-alert thresholds. A lightweight cloud back-end (Firebase, AWS, Azure or similar) will collect sensor or PLC data; plea...

    $2009 Average bid
    $2009 平均报价
    53 个竞标

    i want freelance for food and insta mart delivery app & web developer with what's app api automation setup work

    $1538 Average bid
    $1538 平均报价
    32 个竞标

    I need a small Dolibarr module that lets me attach JPEG images directly to a project report and label every file with its relevant project-stage tag (e.g. Planning, Execution, Handover, etc.). When a user uploads the image, the tag should be chosen from this fixed list so we keep our naming consistent across the ERP. Right now I am undecided about letting users create their own tags. If you can keep the code flexible enough to switch that feature on or off through the module settings, please highlight how you would do it. Key expectations • Seamless upload from the Project card – no separate menu. • Stored files must follow Dolibarr’s standard directory logic so backups keep working. • Tag field visible in the document list and in the file detail pop-up. ...

    $1695 Average bid
    $1695 平均报价
    28 个竞标

    I’m planning a full-featured cosmetics store built with Flutter for both iOS and Android. The core of the app is straightforward: customers browse an attractive catalogue, add items to their cart, pay securely, and leave ratings or reviews that appear in real time. I want phone-number OTP to be the one and only way users create an account and sign in; email or social logins can stay out of scope for now. For payments, the checkout flow must support credit and debit cards alongside two local options—Vodafone Cash and InstaPay—so please factor in the necessary gateways or custom API work. If you prefer Stripe, Paymob, or another processor, let me know the pros and cons for these specific wallets. High-level deliverables • Flutter source code structured for easy mai...

    $3798 Average bid
    $3798 平均报价
    156 个竞标

    Hi, I would like a professional website designed and developed for new courier company, Ayzaro. Ayzaro will initially provide local, same-day and scheduled courier services, with the intention of expanding into a larger delivery platform as demand grows. The website should look modern, trustworthy, fast and easy to use on both mobile phones and computers. Pages required: Home About Us Our Services Request a Quote / Book a Delivery Track a Delivery Become a Courier Business Accounts Frequently Asked Questions Contact Us Privacy Policy, Cookie Policy and Terms and Conditions Services to display: Same-day delivery Local courier services Scheduled deliveries Business and office deliveries Document and small-parcel delivery Multi-drop delivery Urgent deliveries Booking and quotation fo...

    $4889 Average bid
    $4889 平均报价
    306 个竞标

    I need someone to **set up the complete process to automatically send scheduled WhatsApp messages from Zoho CRM through Twilio**. I will provide all the WhatsApp message content, videos and Twilio templates. **Your job is to build the automation that sends them automatically at the correct times.** ### 1. Enquiries – Consumer Automatically send: * Enquiries – ConsumerWhatsApp – Day 0 *Enquiries – Consumer WhatsApp – Day 8 *Enquiries – Consumer WhatsApp – Day 14 * Enquiries – ConsumerWhatsApp – Day 21 * Enquiries – ConsumerWhatsApp – Day 30 ### 2. Enquiries – Self Booking / Preplanning Automatically send: * WhatsApp Self Booking /– Day 0 * WhatsApp Self Booking /– Day 8 * WhatsApp Self Booking /&ndash...

    $1224 Average bid
    $1224 平均报价
    151 个竞标

    Realizar un sistema informatico que de cumplimiento a la NOM 023 ASEA 2025, Requerimientos de la CNE, PROFECO y STPS para 5 estaciones de servicio. la idea es que sea una plataforma que centralice la informacion de estas estaciones, alerte cuando tenga vencimientos, lleve bitácoras operativas y de informes de auditorias

    $1397 Average bid
    $1397 平均报价
    72 个竞标

    I already run a working tele-calling suite: one web portal and three Android apps distributed as locally installed APKs. The code is stable, but the original developer has moved on, so I need a parallel copy of the entire stack—web and mobile—where we can add new functionality without touching the production system. After the environment is mirrored, I want two key upgrades: • Call recording built right into the apps, capturing both sides of every conversation, saving securely on the server, and linking each recording to its corresponding call log for easy playback. • A clear analytics & reporting layer that turns raw call data into actionable charts and exportable reports—think totals, durations, agent performance, and conversion metrics viewable on the...

    $667 Average bid
    $667 平均报价
    28 个竞标

    Project Overview I am looking for an experienced WhatsApp Cloud API / Meta Business API developer to set up WhatsApp Cloud API from start to finish and integrate it with our existing OnTime Cabs cab-booking website. This is a complete implementation project. I need someone who can handle Meta setup → WhatsApp API → templates → webhook → backend integration → website integration → testing → production deployment → documentation and handover. WhatsApp API Setup Freelancer must handle the complete Meta setup, including: Meta Business Portfolio configuration WhatsApp Business Account WhatsApp Business phone number Meta Developer App WhatsApp Cloud API API authentication Webhook Webhook verification Message templates Template variables Production con...

    $212 Average bid
    $212 平均报价
    41 个竞标

    $5-$10. Max for this expert information: EXPERT REQUIRED: POLYMARKET HISTORICAL DATA ARCHITECTURE FOR QUANTCONNECT/LEAN I need an expert to solve one specific problem in my existing Polymarket quantitative trading system. With traditional futures trading, I can obtain large amounts of continuous historical data for the same underlying asset and use QuantConnect/LEAN to perform discovery, backtesting, walk-forward testing, out-of-sample validation, overfitting analysis, parameter optimization, and strategy validation. Polymarket is fundamentally different because it consists of thousands of individual prediction markets that open, evolve, and resolve at different times. My concern is that my current LEAN bridge does not have enough historical Polymarket data in a format that allows it ...

    $149 Average bid
    $149 平均报价
    25 个竞标

    i want full script of "" and develop of other domain

    $118 Average bid
    $118 平均报价
    35 个竞标

    Mam gotowy, wstępnie przygotowany przez Cloud fragment kodu w Pythonie – potrzebuję, abyś szybko przekuł go w działający skrypt automatyzacyjny. Zadaniem skryptu ma być jednoczesne: • zbieranie danych ze wskazanych stron internetowych (kilka prostych źródeł HTTP/HTML), • komunikacja z zewnętrznym API, do którego pozyskane dane będą wysyłane w ustalonym formacie JSON. Kod startowy oraz dostęp do repozytorium, przykładowe endpointy API i krótką specyfikację otrzymasz ode mnie od razu po rozpoczęciu współpracy. Oczekuję, że: • uzupełnisz brakujące moduły / funkcje, • zadbasz o przejrzyste logowanie błędów i solidne obsłużenie wyjątków, • przygotujesz prostą instrukcję uruchomienia (README) wraz z listą wymaganyc...

    $863 Average bid
    $863 平均报价
    49 个竞标

    I need a complete SellHub store built and ready for launch. The site must handle both digital downloads and physical inventory, so the product structure should be organised for licensing files, instant-deliverables as well as shippable items. Please add an initial batch of products.. For payments I’ve settled on Stripe and crypto for checkout, refunds and webhook handling all have to run through Stripe’s latest API version so I can use their dashboard without extra plugins. Discord is a core part of the workflow. Customers should be able to sign in with Discord OAuth2 (user authentication) and, once an order is completed, a purchase-confirmation message must post automatically to a channel I specify (notification system). Keep the code clean so I can later extend it to activi...

    $620 Average bid
    $620 平均报价
    65 个竞标

    I already have an Android Device Policy Controller that locks financed handsets when an EMI is missed, plus a small web dashboard that lets the lending team provision devices and trigger unlocks. The current build is unstable on Android 13, the UI feels dated, and the payment workflow is tied to a gateway we no longer use. I need the entire solution rebuilt and hardened. Core behaviours that must work flawlessly: • Lock the phone the moment a scheduled payment fails. • Allow me to whitelist only basic apps (dialer, messages, payment app) while the device is locked. • Push automatic reminders before the due date and after a failure until settlement. • Capture an e-mandate (eNACH/UPI AutoPay) during onboarding so future EMIs run without user action. The admin portal sho...

    $15098 Average bid
    $15098 平均报价
    167 个竞标

    I need a secure client portal developed using Titan Forms or Salesforce. The primary function of this portal is data submission, specifically for employee information. Essential Functionalities: - Form validation: Ensure all submitted data is accurate and complete. - Data encryption: Protect sensitive employee information during transmission and storage. - File uploads: Allow clients to upload necessary documents securely. Ideal Skills & Experience: - Proficiency in Titan Forms and Salesforce. - Strong background in form validation and data encryption. - Experience with secure file upload functionalities.

    $188 / hr Average bid
    $188 / hr 平均报价
    111 个竞标

    Estoy buscando un socio técnico para colaborar en un sistema de ciberseguridad patentado, SISTEMA DE DETECCIÓN Y CONTENCIÓN AUTÓNOMA DE MOVIMIENTO LATERAL (ALC-FL), desarrollado con IA y basado en 23 reivindicaciones de la patente registrada en República Dominicana. El código, creado junto a un ingeniero en Canadá, está escrito en Rust y listo para compilarse como MVP. Entre sus características destacan: - Cierre de ventanas laterales en 0.01 segundos. - Eliminación de falsos positivos. - Mejora del rendimiento del CPU y reducción de temperatura del chip. - Limpieza del 80% del ruido o información no válida. Estoy interesado en asociarme con alguien que pueda analizar, compilar, ofuscar y empaqueta...

    $1106 Average bid
    $1106 平均报价
    20 个竞标

    I already have an Android Device Policy Controller that locks financed handsets when an EMI is missed, plus a small web dashboard that lets the lending team provision devices and trigger unlocks. The current build is unstable on Android 13, the UI feels dated, and the payment workflow is tied to a gateway we no longer use. I need the entire solution rebuilt and hardened. Core behaviours that must work flawlessly: • Lock the phone the moment a scheduled payment fails. • Allow me to whitelist only basic apps (dialer, messages, payment app) while the device is locked. • Push automatic reminders before the due date and after a failure until settlement. • Capture an e-mandate (eNACH/UPI AutoPay) during onboarding so future EMIs run without user action. The admin port...

    $4033 Average bid
    $4033 平均报价
    52 个竞标

    ## AI-Powered Personalized Exam Preparation — React Native Expo App I have an existing **React Native Expo mobile application** for government/competitive exam preparation and want to integrate an **AI-powered personalized learning system** that analyzes each student's existing exam activity and provides actionable, personalized guidance. ### What I Need Built The AI should use the student's existing data, such as: * Exams/courses attempted * Questions attempted * Correct and incorrect answers * Question-wise performance * Subjects and chapters * Topics/subtopics * Mock test scores * Previous/PYQ performance * Time spent or other available performance metrics * Overall progress and historical performance The system should analyze this data and generate a **personalized...

    $847 Average bid
    $847 平均报价
    45 个竞标

    I’m building a Java-based web application and the very first module I need completed is secure user authentication that relies on two-factor verification rather than the usual single-password flow. The goal is simple but critical: a visitor must be able to register, log in, and re-authenticate using a second factor (TOTP, SMS, or a similar mechanism we agree on) before gaining access to protected routes. The stack is Java on the back-end; I’m comfortable if you lean on frameworks such as Spring Boot and Spring Security, but I’m equally open to lighter solutions provided you can document every step clearly. What matters most is clean, maintainable code and a frictionless developer setup so the rest of the product team can extend your work later. Deliverables I need from ...

    $1977 Average bid
    $1977 平均报价
    70 个竞标

    *1. Project Name* `On-Demand GP Home Visit App | React Native + Node.js MVP` *2. Project Description* Building MediRide - an on-demand platform for GP home visits in South Africa. Scope for MVP: - Patient app: Book visits, triage, pay, live GP tracking, ratings - GP app: Go online/offline, accept jobs, navigate, submit clinical notes offline - Backend: Job dispatch, real-time tracking, Stripe/Paystack payments with split payouts, push notifications - Admin dashboard: Manage jobs, users, pricing, payouts What’s ready: - Full PRD v1.2 with flows and acceptance criteria - Figma designs for mobile + web admin - with all copy - Brand assets and staging API keys Tech: React Native for iOS + Android, Node.js + Express backend, PostgreSQL. Open to recommendations but must launch on ...

    $1875 Average bid
    $1875 平均报价
    219 个竞标

    Immediate need : I'm connecting our RingCentral Contact Center (NICE CXone) platform to Salesforce Sales Cloud and need an experienced developer to own the build over the next 20 to 40 hours. What it needs to do: On every inbound call, surface the matching Lead, Contact or Account to the agent If the caller is unknown, launch a guided screen that captures their details and creates a Lead on save Pass the dialed number through so the Lead is tagged with the campaign that drove the call The work: Configure Open CTI, Call Center and Softphone Layout using our existing managed package, so no custom adapter is needed. Build the Apex REST lookup endpoint CXone calls on each inbound call. Standardize phone data to +1 E.164 and set duplicate and matching rules so caller matching works. Buil...

    $1193 Average bid
    $1193 平均报价
    59 个竞标

    1. Mobile Apps Android phone app iPhone app iPad optimized app Login/OTP Home/dashboard Video player QBank PYQs Test series Results Performance analytics Bookmarks/notes Offline downloads Notifications Subscription/payment Profile/settings 2. Backend / API User authentication User profiles Course/subject management Video APIs QBank APIs Test APIs Result calculation Performance/analytics APIs Subscription management Payment verification Coupon system Notification APIs Device/session management Access control Database Backup/recovery API security 3. Admin Panel Admin login & roles User management Subject/topic management Video upload & management Notes/PDF management MCQ/QBank management PYQ management Test creation Test scheduling Results management Subscription management Payment...

    $28312 Average bid
    $28312 平均报价
    95 个竞标

    Production build: multi-tenant HR/recruitment SaaS — Saudi-hosted Saudi-registered company. We have a working, demo-ready prototype of a bilingual recruitment and HR platform. We are commissioning a production-grade rebuild and are looking for an established development company — not an individual. Non-negotiable: all data must reside and be processed inside Saudi Arabia. Acceptable: STC Cloud, SCCC Alibaba Cloud, Google Cloud Dammam, Oracle Riyadh. Bids proposing hosting outside KSA will be rejected without review. Platform architecture — two layers 1. Tenant application — the workspace each client company uses, fully isolated 2. Owner console — our internal layer for client provisioning, plan management, entitlements and revenue Scope — 50+ modules a...

    $17287 Average bid
    $17287 平均报价
    218 个竞标

    My current Octoparse crawler no longer starts: when I click “Run” the workflow simply refuses to launch. The target is a non-e-commerce, non-news website, and the job is not about delivering a one-off data file—I need the workflow itself brought back to life so I can run it autonomously whenever I wish. What the crawler must still handle • Pagination des pages • Gestion des captchas • Extraction des données dynamiques Your mission Diagnose why the task will not start, correct or rebuild the workflow, and return a fully operational Octoparse file. Please outline your previous experience with Octoparse (especially on complex or anti-bot scenarios), describe the steps you usually take to pinpoint scraping failures, and give me an estimated t...

    $251 Average bid
    $251 平均报价
    50 个竞标

    We have a requirement for creating repeatable Azure deployments. This project has has the following milestones and deliverables: Milestone 1 — Environment and deployment setup Set up and script the deployment of the application environment using infrastructure-as-code. Deliverable: repeatable deployment from a clean subscription. Milestone 2 — Authentication and access configuration Configure application identity and access, and automate the parts that are currently manual. Deliverable: sign-in works on a freshly deployed environment with no manual steps. Milestone 3 — Pre-deployment validation Add checks that run before deployment starts and report clearly if prerequisites are not met, rather than failing part-way. Deliverable: validation step plus user-facing messagi...

    $8961 Average bid
    $8961 平均报价
    204 个竞标

    I need a secure, browser-based portal where my business customers can log in, view all open invoices, see the applicable cash discount for each one, and immediately settle the balance through our bank-transfer gateway. After the customer confirms payment, the system must generate a downloadable payment advice and then e-mail an official payment receipt automatically. Core workflow 1. Pull invoice data from our ERP (REST API available) and display it in a clean, filterable grid. 2. Let the customer tick the invoices they wish to pay; the portal calculates cash discounts in real time. 3. Route the net amount to our bank-transfer gateway (we already have the API docs). 4. On success, create the payment advice PDF, mark the invoices as paid through the ERP callback, trigger the e-mail...

    $30847 Average bid
    $30847 平均报价
    113 个竞标

    ## B2B Lead Generation Platform I’m looking for an experienced full-stack developer to build a **B2B lead-generation platform** that allows me to search for business prospects worldwide, filter them by different criteria, verify business emails, and export qualified leads to CSV. ### Main Features * Search businesses worldwide * Filter by: * Industry * Country / city / region * Company size * Job title / contact role * Other available firmographic data * Use reliable **licensed APIs/data providers** * Collect available company and business contact information * Email verification with deliverability status * Custom filters, tags, and lead management * Search results with pagination * Bulk lead selection * One-click CSV export * Secure database * Admin dashboard * API ke...

    $2362 Average bid
    $2362 平均报价
    73 个竞标

    I need a full-scale hotel management platform, but the very first milestone has to be a rock-solid Reservation System that guests can use end-to-end online. Visitors must be able to check real-time room availability, create a booking, receive instant confirmation, and manage their stay dates from any device. On the back end I want a clean dashboard where staff can see incoming reservations, apply rate rules, block rooms, and override allocations without delays. Online Booking is the only feature that must ship in this phase; modules such as Billing & Payment or broader Inventory Management can wait until the reservation flow is proven in production, yet the architecture should leave room for those add-ons. A responsive web interface, secure database design, role-based access, and succ...

    $71 / hr Average bid
    $71 / hr 平均报价
    103 个竞标

    Looking for a low-level Linux/KVM/QEMU developer. I already handle the Ubuntu/Linux host, Windows VM, GPU passthrough and VFIO/IOMMU setup myself. I only need help building a LeechCore-style DMA converter/backend for my own lab VM. Project idea: PC2 client connects over LAN to the Linux host. The Linux host reads memory from my own KVM/QEMU test VM. The converter exposes a DMA-like read API for research and testing. Needed features: - read(address, size) - scatter read - memory map handling - caching / batching for speed - TCP client/server communication - speed test / benchmark mode - clean error handling - config file support Preferred backend: - LibVMI - LeechCore QEMU backend - QEMU/KVM memory introspection Required skills: - C/C++ or Rust - Linux low-level develo...

    $3484 Average bid
    $3484 平均报价
    71 个竞标

    I’m building an online “rental boyfriend” service that exists entirely in the digital space. The goal is to let customers book virtual time with a companion and enjoy three core experiences once the booking starts: • live video calls powered by WebRTC or a comparable real-time engine • in-platform text chat that stays archived for each session • lightweight interactive games the pair can launch without leaving the call User discovery should feel familiar—visitors scroll through cards that show a profile picture, click one they like, and land on a more detailed availability page. For now, a photo is the only mandatory profile element, but the codebase should keep room for optional bios or interest tags so we can activate those later without r...

    $2017 Average bid
    $2017 平均报价
    47 个竞标
    Web & Mobile Quiz App Build
    5 天 left
    已验证

    I have a full bank of multiple-choice questions, their options, and an answer key ready to load. What I need is a lightweight quiz application that: • Runs smoothly on both a responsive website and a companion mobile app. • Lets each student create an account, log in, and sit the test only once. • Presents one question at a time (or paginated, whichever is quicker for you to code), captures their selections, and forces completion before submission. • Immediately displays the final score to the student on screen. • Emails me an easy-to-read report that shows every question, the student’s chosen answer, the correct answer, and a total tally of right vs. wrong. Timing is critical: you’ll need to start within 24 hours of award and deliver a fully ...

    $1483 Average bid
    $1483 平均报价
    390 个竞标

    I am starting a new project that revolves around ASP .NET Core 8 (C# 12). The priority is pure backend work: designing and coding a robust API layer that will let intelligent agents plug into our existing business systems in real time. The heart of the job is the “connexion d’agents IA” aspect. You will be creating MCP-compliant services that expose context, receive agent actions, and safely persist results. While the immediate focus is this AI bridge, your code must stay clean and extensible so we can later hook the same backbone to front-end interfaces or even an eventual Sage 100 connector. To move forward I need a detailed project proposal outlining: • the architecture you would follow for an MCP server under ASP .NET Core 8 • the way you will secu...

    $1287 Average bid
    $1287 平均报价
    120 个竞标

    I’m launching a CPQ-driven webshop that must talk directly to new license server. My priorities are straightforward: • Users will sign in exclusively through Microsoft Azure AD SSO. No local usernames or social-logins—just Azure AD with proper role mapping. • After authentication, customers need the usual CPQ flow (configure → price → quote → checkout) and, on completion, the system must call the license server’s API to create or update the customer’s subscription license automatically. • Every product in the catalogue is subscription-based, so the cart, checkout and subsequent renewals have to respect recurring-billing rules. I’m flexible on the underlying commerce platform—whether that ends up being Shopify, WooC...

    $1467 Average bid
    $1467 平均报价
    114 个竞标

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