FE
Staff Software Engineer - Security
Contract type
Ongoing
Work mode
Remote · London
Experience
Senior · 8+ years
Job description
Flow Engineering is hiring its first dedicated security hire, a Staff Software Engineer, to own security across its AI-native requirements platform for hardware teams. The role covers security architecture, platform hardening, SOC 2 and defense-related compliance, and securing LLM and agentic systems.
At a glance
- Employment
- Full-time
- Work mode
- Remote · London
What you'll do
- Own security architecture across the platform: threat modeling, secure design reviews, and the standards we build against.
- Harden the full stack, from application security to cloud infrastructure (identity, network, secrets), tenant isolation, and data protection.
- Drive SOC 2 and get us ready for the certifications defense and aerospace customers ask about, including export control and ITAR.
- Secure our AI and agentic systems: prompt injection, data leaking through models, what actions agents are allowed to take, and guardrails.
- Build the security tooling we need across detection, monitoring, vulnerability management, and CI/CD.
- Stand up incident response and run it, from detection through postmortems.
- Work with sales and product to get through security reviews and win customer confidence.
What we're looking for
- 8+ years building production software, including running secure services at scale in the cloud.
- Deep experience in application and cloud security (AWS, GCP, or Azure): identity and access, secrets, network security, data protection.
- You've owned security in a regulated or high-trust environment and have implemented SOC 2 yourself.
- Solid on threat modeling, secure architecture, and incident response.
- You've secured AI or LLM systems.
- You're comfortable being the security lead at a startup and setting the agenda yourself.
Nice to have
- Export control, ITAR, or FedRAMP experience is a big plus.
Benefits
- Competitive salary and meaningful equity.
- Health, dental, and vision coverage.
- Flexible time off and support for experimentation, learning, and staying current with the AI ecosystem.
Apply
About Flow Engineering
AI-native requirements platform for modern engineering organizations
Flow Engineering is an AI-native requirements platform for modern engineering organizations, enabling hardware teams to collaborate with AI agents to design, validate, and evolve complex systems with speed and rigor.
Key facts
- Customers in defense, aerospace and more trust Flow with sensitive systems requirements.
- This is the company's first dedicated security hire.
What they value
- Speed over everything: prototype AI workflows quickly, then harden what works.
- Own, downscope, ship, iterate: one clear owner per feature, from prototype to production.
- Fundamentals done well: evaluation, observability, and safety are part of the first version, not an afterthought.