Senior/Staff Founding Full-Stack Engineer, Agent Systems

Headcount: 1

Job Details

• Experience: 4+ years
• Salary: Not specified
• Equity: 1%–2%
• Visa sponsorship: H-1B, O-1, OPT
• Employment type: Full-time
• Work type: In person

Benefits & Perks

• Meals in the office
• Health insurance
• Unlimited PTO

About This Role

This is a backend- and systems-heavy founding engineering role where “full-stack” means owning the product and system end to end. The role is based at our San Francisco office, in person five days a week.

What You’ll Own

• The workflow engine for long-running human and agent work: durable state, retries, idempotency, approvals, replay, compensation, and auditability
• Identity and authorization for humans, services, and agents: principals, delegation, scoped sessions, tenant isolation, and traceable authority
• A versioned policy engine defining who or what can perform which action on which resource, and under what context
• Secure storage and use of customer keys, OAuth tokens, and admin credentials, including isolation, rotation, ephemeral injection, revocation, and blast-radius containment
• The probabilistic-to-deterministic execution boundary, including validation, evaluations, and release gates
• Isolated virtual environments and development boxes for agents, including reproducible state, observability, resource controls, and safe teardown
• The interfaces and APIs to author, approve, inspect, debug, and operate these systems in production

Requirements

• Experience designing and operating complex production systems, with the ability to explain what broke, how it was recovered, and what changed
• Strong backend and systems architecture skills, with the ability to work across frontend, data, infrastructure, and product
• Depth in one or more of the following: IAM/authorization, policy systems, workflow orchestration, security, multi-tenant SaaS, agent infrastructure, MDM, ITSM, enterprise integrations, or virtualized execution
• Thinks in invariants, threat models, failure modes, and user outcomes
• Works well amid ambiguity and moves quickly without compromising correctness, security, or operability