Senior Fullstack Engineer- Auth Team

As a Senior Full Stack Engineer on the Platform Team, you will develop and operate Alpaca’s authentication, authorization, and Identity Provider (IdP) systems - the systems that handle user login, access control, and secure access across our APIs, customer products, and internal tools.

We are looking for experienced engineers who are comfortable owning services end to end: API design, data modeling, deployments, and production debugging. Most of your time will be spent writing Go (backend services, gRPC/REST APIs, shared client libraries), with meaningful work in React/TypeScript for auth-related UI, and occasionally Java for identity-provider extensions. You will also work with Helm charts, analyze logs and metrics, manage deployments, and help other teams to integrate with our services.

Things You Get To Do

• Build and improve authentication-related experiences in customer and partner web applications, including login, permissions, and credential management.
• Develop and maintain the platform’s authentication, authorization, and IdP services.
• Create and evolve shared libraries and SDKs.
• Integrate with identity providers and keep login and access policies working reliably across products.
• Deploy, monitor, and troubleshoot identity services in production.
• Help modernize legacy authentication patterns as the platform evolves.
• Own work end to end, from requirements through delivery and follow-up.
• Collaborate with other engineering teams on identity and access integration.
• Maintain high code quality, write tests, and participate in code reviews.
• Help investigate incidents and bugs, including on-call rotation.

Who You Are (must-haves)

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