Software Engineer — Open Source

Core framework architecture — auth endpoints, sessions, cookies, request context, middleware, and before/after hook pipelines

Public API and type system design — shaping stable, ergonomic interfaces across the framework, plugins, and client libraries

Plugin and package architecture — evolving Better Auth’s extension model across the core library and first-party packages

Reactive client systems — designing and evolving the typed client, shared session state model, and cross-framework reactive architecture that power React, Vue, Svelte, Solid, and Lynx

Runtime and framework compatibility — ensuring Better Auth works correctly and consistently across Node.js, Bun, Deno, Cloudflare Workers, and multiple framework integrations

Security and identity protocols — OAuth2, OIDC, SAML, SCIM, passkeys, CSRF protections, origin validation, rate limiting, and secure session handling

Enterprise platform foundations — helping define and build capabilities around org management, provisioning, admin workflows, observability, analytics, and operational tooling

OSS/commercial product boundaries — deciding what belongs in the open-source framework, what belongs in the enterprise layer, and how the two compose cleanly

Release quality and contributor experience — code review, issue triage, docs, tests, migration strategy, and safe upgrade paths for users

Experience level — 7+ years of software engineering experience building and shipping production systems in TypeScript

Advanced TypeScript — You’re comfortable with complex generics, conditional types, mapped types, template literal types, and inference, and you know how to use them to design developer-facing libraries

API Design Instinct — You think carefully about ergonomics, backwards compatibility, migration paths, and the long-term consequences of public API decisions