Your looking for someone to write short functions and unit test before deploying to Github.
I've built an ecommerce site with a frontend built with Vue that is served using Express.js.
Inputs and outputs going through the logic, I've written multiple tests using Jest.
For serverless websites I've used Google Firebase for cloud functions and databases.
Ive used Postgres and Maria DB to store data.
Your questions will help produce a quality app. Let's chat about your project and I'll provide even more details about my abilities. Good luck on your ongoing search. Talk soon.