Back End Developer

Sr. Backend EngineerSan Francisco, CA | $200K–$260K + equityFast-growing, profitable AI infrastructure company seeking a Backend Engineer (3+ years) to own our guardrails and observability tooling at scale. You'll build for high-volume, mission-critical traffic and work directly with developers at large enterprise customers.You'll:• Build and scale our backend for reliability at massive volume• Own guardrails and logging code, ensuring traceability and clear error handling• Strengthen our observability stack for high-throughput, low-latency performance• Develop in Python and/or Rust, including CPU-level guardrails against common attacks• Engage directly with enterprise customer developers several times a weekYou have:• 3+ years backend engineering experience, ideally at a high-growth startup• Proficiency in Python or Rust• Experience with backend frameworks (FastAPI, Flask) and observability/monitoring tools• Familiarity with PostgreSQL and Redis• A CS degree or related technical field• Comfort with frequent customer interaction and a ~60 hr/week paceGood energy, hustle, and genuine excitement for startup life a must.