Technical Writer — API Documentation & Developer Portal

We have built a payment infrastructure API used by 400+ developers and our documentation is embarrassingly outdated — written 3 years ago and missing 60% of our current endpoints. We need a technical writer who can read TypeScript and JSON to document our full REST API in OpenAPI 3.1 format, write getting started guides for 4 use cases, create code samples in JavaScript, Python, and Go, write a migration guide from v1 to v2, and publish everything in a Mintlify developer portal. You will work closely with 3 backend engineers. NDA required. Candidates should share an API docs portfolio sample with their proposal.