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nestjs-auth-graphql-starter
Discontinued NestJS starter template with GraphQL and PassportJS authentication.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
As for project setup, something as big as Upwork in a production environment IMHO would be using a framework like NestJS instead of barebones ExpressJS, as it offers more abstractions. If you'd like to see how I implemented all the features an API like that would need, I urge you to check out my NestJS GraphQL w/ authentication boilerplate! It also features REST endpoints if you don't want to use GQL.