API & Integrations Engineer

API & Integrations Engineer

Location: San Francisco, CA – Onsite
C2C/1099

• 100% Onsite – San Francisco
• High-ownership, fast-paced startup environment
• Direct collaboration with the founding team

Opportunity to shape API and integration architecture from the ground up

Position Summary

We are looking for an experienced API & Integrations Engineer to take ownership of the company’s public APIs and third-party integrations. This is a high-ownership engineering role working closely with the founding team, where you will make architectural decisions and own technical problems end to end.

This is not a general backend engineering role. Strong hands-on experience building and operating external APIs and complex third-party integrations is essential.

Key Responsibilities

• Design, develop, maintain, and evolve public/external APIs.
• Own API architecture, design, versioning, security, and scalability.
• Build and maintain complex third-party SaaS integrations.
• Implement and manage OAuth 2.0 and OpenID Connect (OIDC) authentication flows.
• Develop reliable webhook systems and data synchronization processes.
• Design solutions for API rate limits, retries, failures, and integration reliability.
• Troubleshoot production integration issues and drive problems through resolution.
• Partner closely with the founding team on architecture and technical decisions.
• Take full ownership of projects and technical problems from design through production.

Required Skills

• Strong hands-on experience with public/external API architecture, design, and versioning.
• Deep understanding of OAuth 2.0 and OIDC.
• Proven experience with complex third-party SaaS integrations.
• Strong knowledge of webhooks, data synchronization, rate limiting, and API reliability.
• Production troubleshooting and incident-resolution experience.
• Strong development experience with Node.js and TypeScript.
• Ability to work independently in a high-ownership environment.

Preferred Qualifications

• Experience working in an early-stage startup/SaaS environment.
• Comfortable making architectural decisions with limited direction.
• Strong communication and collaboration skills.
• Experience working directly with founders or senior technical leadership.
• Demonstrated ability to own initiatives and deliver solutions end to end.