Hello
We can use "Infopath" form to design online sickness form.
We can use "workflow" so that admin distribution group will get a notification about form submission.
I understand that you want online sickness for your staff and it should select auto-fill the staff member name according to his/her username.
We are a team of software developers who work on Microsoft technology stack like C#, asp.net, SQL Server, Azure SQL database, WPF, WCF, Sharepoint, MVC etc.
Other skills- HTML5, CSS, JQuery, Bootstrap, JavaScript.
We can schedule a chat/call for further discussion.
Thanks,
Smita