About the role

JavaScript/TypeScript SDK Engineer building open-source developer tools for Supabase’s Postgres platform. Owning SDK APIs, type systems, runtimes, realtime, releases, and public documentation.

Responsibilities

Build and evolve Supabase’s JavaScript and TypeScript SDKs
Identify missing platform capabilities, make the case for them, and build new features
Triage inbound issues and review and shepherd outside contributions in public repositories
Maintain CI and release automation and manage project scope
Ensure generated database types flow correctly through client APIs for accurate autocomplete and inference
Support Node, Deno, Bun, browsers, Cloudflare Workers, and React Native/Expo runtimes
Maintain dual ESM/CJS publishing and correct type resolution across module resolution modes
Develop realtime functionality involving WebSocket connections, reconnection, subscriptions, and presence semantics
Keep SDKs aligned with changes to auth, realtime, storage, PostgREST, and edge runtime services
Write RFCs, migration guides, release notes, changelogs, and documentation
Make SDKs legible to AI coding agents

Expert-level TypeScript, including generics, conditional types, and mapped types
Authored or maintained a published library with a public API and external consumers
Experience working on open-source projects from the maintainer side
Experience with issue triage, outside pull-request reviews, release automation, changelogs, semantic versioning, and security reports
Fluency with npm packaging, dual ESM/CJS builds, export maps, and type resolution
Testing experience across unit, type-level, and end-to-end tests against a real stack
Strong written communication for design documents, changelogs, and public issue responses
Ability to work autonomously: identify, scope, and ship important work
Ability to communicate clearly across technical and non-technical audiences
Experience in async or globally distributed teams
Comfortable navigating ambiguity and moving quickly
Energized by solving real-world problems for developers