This range is provided by Third Republic. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range $90,000.00/yr - $220,000.00/yr Direct message the job poster from Third Republic Leading the recruitment for Machine Learning / AI, Cloud & Data Engineers across the US My client is a Seed-funded startup (aiming for Series A this year), hiring a Senior Backend Engineer to help build the foundational infrastructure for a new kind of financial ecosystem - one where autonomous AI agents can seamlessly pay for services. What You’ll Be Doing: Own the design, implementation, and scaling of backend systems powering real-time payments and identity flows between digital agents and services. Help define core APIs that will serve both internal systems and external integrations. Work closely with founders and product leadership to scope requirements and make architectural decisions from scratch - 0→1 ownership expected. Contribute to everything from backend logic and data models to observability, deployment pipelines, and production monitoring. Develop resilient systems that prioritize throughput, latency, and type safety. You Should Have: Deep experience in backend engineering, ideally with Node.js and TypeScript (this is not a role for frontend engineers picking up Node). A strong understanding of API design, including authentication (OAuth2, JWT), authorization (RBAC), and performance considerations. Experience working in small teams or startup environments, with a track record of delivering production-ready services with minimal oversight. Confidence in owning your work end-to-end - from technical design to testing, shipping, and maintenance. Familiarity with PostgreSQL, CI/CD workflows, and modern cloud environments (e.g., Render, AWS, GCP, etc.) Bonus Points For: Exposure to agent-based systems, LLMs, or any work with AI/ML infrastructure Experience with event-driven architecture, time/space complexity optimization, or distributed systems Curiosity about the intersection of AI and programmable finance Prior contributions to developer platforms, SDKs, or internal tooling The Offer Competitive salary based on level and experience (mid-to-senior range) Meaningful early-stage equity Hybrid working (3 days/week in a downtown SF office) Health coverage A tight-knit, low-ego engineering culture Seniority level Seniority level Mid-Senior level Employment type Employment type Full-time Job function Industries Software Development and Financial Services Referrals increase your chances of interviewing at Third Republic by 2x Get notified about new Software Engineer jobs in San Francisco, CA . San Francisco, CA $130,000.00-$238,000.00 9 hours ago San Francisco, CA $145,000.00-$230,000.00 1 day ago Software Engineer Frontend (Multiple Levels) - Slack San Francisco, CA $130,000.00-$190,000.00 9 hours ago San Francisco, CA $56.25-$173,000.00 1 day ago San Francisco, CA $150,000.00-$176,000.00 2 weeks ago San Francisco, CA $170,000.00-$270,000.00 2 weeks ago San Francisco, CA $99,500.00-$200,000.00 2 weeks ago San Francisco, CA $120,000.00-$190,000.00 6 months ago San Francisco, CA $180,000.00-$250,000.00 6 months ago San Francisco, CA $130,000.00-$185,000.00 2 weeks ago Software Engineer, Frontend (All Levels) San Francisco, CA $150,000.00-$220,000.00 2 weeks ago Senior Fullstack Engineer – Frontend Leaning, Handshake AI We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI.

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