# Software Engineer — Open Source at Better Auth

- Company: Better Auth
- What the company does: The Most Comprehensive Authentication Framework. Backed by Peak XV and Y Combinator.
- Company website: https://www.better-auth.com/
- Type: Startups
- Level: Mid level
- Location: San Francisco, United States
- Work setup: On-site
- Posted: 2026-04-30
- Apply by: 2026-10-08
- Apply: https://jobs.gem.com/better-auth/am9icG9zdDp71mT4xWXbJ3bZFfLp-sae
- Page: https://www.1752.vc/careers/jobs/better-auth-software-engineer-open-source/

## About the role

You’ll work across the open-source core and the enterprise platform we’re building on top of it. This is not a feature-factory role. You’ll make architectural decisions that shape Better Auth’s public APIs, plugin system, runtime compatibility, reactive client behavior, and security model.

## What they're looking for

- 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
- Security and Platform Judgment — You’re comfortable working in auth-heavy, security-sensitive systems and can reason across sessions, tokens, redirects, CSRF, OAuth2/OIDC, and cross-runtime constraints
- Open Source Leadership — You communicate clearly, write thoughtful reviews, maintain a high quality bar, and understand the responsibility that comes with building APIs other developers depend on
- Ownership — You’re comfortable taking ambiguous, high-leverage work from idea through implementation, release, and follow-through