Backend Systems Engineer — AI Agents & Scalable APIs

Zof AI; San Francisco, Northern (CA, KY); Hybrid; USD 120,000 - 190,000; Full time

Job summary

Zof AI is seeking a Backend Software Engineer to own the services, APIs, and data layer that our agent fleets run on. You will own job orchestration, queueing for long-running agent runs, and Postgres schema and query performance.

This role also covers storage for evidence and traces, with a focus on observability and reliability. The ideal candidate writes clear, well-tested services and balances throughput, correctness, and cost in a fast-moving, on-site environment in San Francisco.

Qualifications

• Experience building and shipping backend services in production.
• Strong software engineering foundation.
• Familiarity with relational databases and SQL, ideally Postgres.

Responsibilities

• Design, build, and operate the services and APIs our agent fleets run on.
• Build the job orchestration and queueing that keeps long-running agent work moving.
• Own Postgres schema design, migrations, and query performance as data grows.
• Ship the storage and retrieval paths for the evidence and traces every agent run produces.
• Instrument services so failures are observable, debuggable, and recoverable.
• Harden reliability with testing, retries, idempotency, and backpressure under real load.
• Partner with product and AI engineers to turn agent behavior into stable interfaces.
• Own backend systems from design through production.

Skills

Backend development

SQL/PostgreSQL

APIs

Queues / async processing

Testing

Clear communication

Distributed systems mindset

Tools

PostgreSQL

Node.js

TypeScript

Python

Job description

Zof AI is seeking a Backend Software Engineer to own the services, APIs, and data layer that our agent fleets run on. You will own job orchestration, queueing for long-running agent runs, and Postgres schema and query performance.

This role also covers storage for evidence and traces, with a focus on observability and reliability. The ideal candidate writes clear, well-tested services and balances throughput, correctness, and cost in a fast-moving, on-site environment in San Francisco.