Security Architect for AI/Agentic Platform

Flow Engineering, Inc.; Greater London; Hybrid; GBP 120,000 - 160,000; Full time

Job summary

Flow Engineering, an AI-native requirements platform, is seeking a Staff Software Engineer to own security across the platform, including AI/LLM safety and secure design reviews. You will shape architecture, drive cloud security, and lead incident response in a fast-moving environment.

This is the first dedicated security hire, offering the opportunity to define posture from day one, collaborate with product and customers, and build robust security controls for defense and aerospace contexts.

Qualifications

• 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).
• SOC 2 ownership in regulated/high-trust environments; export control/ITAR or FedRAMP experience a big plus.
• Strong on threat modeling, secure architecture, and incident response.
• Experience securing AI or LLM systems.
• Comfortable being the security lead at a startup and setting the agenda themselves.

Responsibilities

• 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 readiness 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.

Job description

Flow Engineering, an AI-native requirements platform, is seeking a Staff Software Engineer to own security across the platform, including AI/LLM safety and secure design reviews. You will shape architecture, drive cloud security, and lead incident response in a fast-moving environment.

This is the first dedicated security hire, offering the opportunity to define posture from day one, collaborate with product and customers, and build robust security controls for defense and aerospace contexts.