JSON Resume is a community driven open source initiative to create JSON-based standard for resumes. Makes it ideal for running through a generator to output a static resume document. Of course, the PoC is written in node.js. Can be integrated into various CMSes and management platforms.

Github: https://github.com/jsonresume/resume-schema

A site that offers integrations to several hundred different online services as a service, because so many APIs are garbage. JSON and XML supported. Tries to make integration easy.

Authenticate against Github to make life easy. Has a generous free tier.

Their code is also on Github so self-hosting is an option: https://github.com/cenit-io/cenit