Dear Peter. Hope you are doing well under the pandemic. As a seasoned Javascript developer, I have strong skills in MEAN and MERN which you mentioned. There are many javascritp frameworks I mastered like Angular, ngSaga, React/Redux, Vue, Next, Node, Nest, Svelte and so forth.
I am very familiar with API integration and confident with Git you may use.
I can start right now and can deliver it within a mean time.
Looking forward to your reply.
Thanks.