Agent Runtime & Security Engineer — Equity Eligible

Nebula; El Segundo (CA); On-site; USD 100,000 - 250,000; Full time

Benefits offered by this job

Equity participation in a high-growth 

Comprehensive health, dental, and VIs

401(k) with company matching

Bonus for living within 5 miles of El 

On-site work with rare work-from-home

Merit-based organization where your‑to

Job summary

Nebula in El Segundo is building Merovingian, the AI side of our internal platform. You will design and implement the runtime, identities, and permissions that let agents work inside the company as colleagues of people here, and craft the trust model that keeps them secure.

The work spans distributed systems and security: identities, leases, policy-driven access, audit trails, and the evidence layer behind every call. You will own the execution plane and shape how agents and people share work.

Qualifications

• Bachelor's degree or equivalent experience in computer science or related field.
• Hands-on production distributed systems experience (leases, expiry, idempotency, back-pressure).
• Security and access-control engineering experience (authentication/authorization, audits).
• Comfort with Rust or another systems language (parsers, interpreters, state machines).
• Strong observability skills for telemetry, tracing, and cost accounting.

Responsibilities

• Develop the agent runtime, including parser/interpreter and execution loops.
• Define identity/lease models, heartbeats, and exactly-once delivery.
• Implement permission and trust models with need-to-know scoping and sandboxing.
• Ensure verification, safe handover, and audit trails for actions.
• Build telemetry, event taxonomy, tracing, and evaluations.
• Manage session context, retention, and cross-session notes.
• Define tool interfaces and access-control schemas.
• Design organization structure for multiple agents with proper supervision.

Skills

Distributed systems

Security engineering

Access control

Rust

Observability

Threat modeling

Adversarial testing

Education

CS or related degree, or equivalent experience

Job description

Nebula in El Segundo is building Merovingian, the AI side of our internal platform. You will design and implement the runtime, identities, and permissions that let agents work inside the company as colleagues of people here, and craft the trust model that keeps them secure.

The work spans distributed systems and security: identities, leases, policy-driven access, audit trails, and the evidence layer behind every call. You will own the execution plane and shape how agents and people share work.