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SupabaseSupabaseUnited States

SDK Engineer - JavaScript

Build and maintain public JavaScript and TypeScript SDKs used across Supabase’s platform, owning type experiences, runtime compatibility, realtime behavior, packaging, testing, and developer documentation. The role requires expert TypeScript, published library experience, open-source maintenance, and strong asynchronous communication.

Salary not listed
RemoteFrontend Engineering

About the role

Responsibilities

  • Build and evolve Supabase’s JavaScript and TypeScript SDKs.
  • Identify missing capabilities, make the case for them, and build new functionality.
  • Triage inbound issues, review and shepherd external contributions, maintain CI and release automation, and manage scope in public repositories.
  • Maintain generated database types so autocomplete and type inference remain reliable.
  • Ensure compatibility across Node, Deno, Bun, browsers, Cloudflare Workers, and React Native/Expo.
  • Support dual ESM/CJS publishing and correct type resolution across module resolution modes.
  • Develop realtime capabilities involving long-lived WebSocket connections, reconnection, subscriptions, and presence semantics.
  • Keep SDKs aligned with platform changes across authentication, realtime, storage, PostgREST, and edge runtime services.
  • Write RFCs, migration guides, release notes, changelogs, and documentation.
  • Improve SDK usability for AI coding agents.

Requirements

  • Expert-level TypeScript, including generics, conditional types, and mapped types.
  • Experience authoring or maintaining a published library with a public API and external consumers.
  • Open-source maintainer experience, including issue triage, external pull-request review, release automation, changelogs, semantic versioning, and security reports.
  • Fluency with npm packaging, dual ESM/CJS builds, export maps, type resolution, and semantic versioning.
  • Experience with unit, type-level, and end-to-end testing against a real stack.
  • Strong written communication for design documents, changelogs, and public issue responses.
  • Ability to work autonomously, scope work, ship independently, and communicate tradeoffs.
  • Clear communication with technical and non-technical audiences.
  • Experience working asynchronously or with globally distributed teams.
  • Comfort solving developer-focused problems, navigating ambiguity, and moving quickly.

Benefits

  • Fully remote work with global hiring and a WeWork membership or coworking allowance.
  • Employee equity through an ESOP.
  • Tech allowance for equipment and workspace needs.
  • Health insurance coverage: 100% for employees and 80% for dependents.
  • Annual company off-sites.
  • Flexible, asynchronous work.
  • Annual professional development allowance.

Skills

TypeScriptJavaScriptnpmesmcommonjsWebSocketsNode.jsdenobunReact Nativeexpocloudflare workerssemantic versioningOpen Sourceend-to-end testing

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