Founding Full-Stack Engineer — AI Security Platform

Thomas Talent Network; San Francisco (CA); On-site; USD 200,000 - 300,000; Full time

Job summary

Confidential client in San Francisco, CA seeks a backend-focused founding engineer to own the product end-to-end. You will build the workflow engine for long-running human and agent work, design identity and authorization, and develop a versioned policy engine with secure storage for keys and tokens.

This is a systems-heavy role requiring ownership of measurements, auditing, and secure execution boundaries, with hands-on development of isolated environments for agents and production interfaces.

Qualifications

• 4+ years of experience in backend or systems engineering.

Responsibilities

• Build the workflow engine for long-running human and agent work (durable state, retries, idempotency, approvals, replay, compensation, auditability).
• Design identity and authorization for humans, services, and agents: principals, delegation, scoped sessions, tenant isolation, traceable authority.
• Develop a versioned policy engine (who/what can do which action on which resource under what context).
• Secure storage and use of customer keys, OAuth tokens, and admin credentials: isolation, rotation, episodic injection, revocation, blast-radius containment.
• Bridge probabilistic model behavior and deterministic execution (validation, evals, release gates).
• Create isolated virtual environments and dev boxes for agents: reproducible state, observability, resource controls, safe teardown.

Job description

Confidential client in San Francisco, CA seeks a backend-focused founding engineer to own the product end-to-end. You will build the workflow engine for long-running human and agent work, design identity and authorization, and develop a versioned policy engine with secure storage for keys and tokens.

This is a systems-heavy role requiring ownership of measurements, auditing, and secure execution boundaries, with hands-on development of isolated environments for agents and production interfaces.