Senior Software Security Developer – Core Platform Services

🔒 Confidential Employer
Posted 24 March 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
CATEGORY
Technology
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

RBAC/ABAC Authentication Secure coding OWASP Top 10 Threat modeling CI/CD Python Go

FULL DESCRIPTION

[Employer hidden — view at passion-project.co.uk] is a deep-tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software.

We are building an AI-driven simulation software stack for engineering and manufacturing across advanced industries. By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, [Employer hidden] unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

The Role

We are recruiting for a Senior Software Security Developer within our Core Platform Services Team. You will be responsible primarily for writing secure code components that many teams will use across the business. There is a strong emphasis on authentication for this role.

What you will do

  • Design and implement platform security features and guardrails.
  • Act as an SME for security for the Core Services development team. This includes mentoring, performing threat modeling, sand ecurity code reviews.
  • Help shape incident response procedures and vulnerability management workflows
  • Support the response team by validating and remediating product security vulnerabilities.
  • Contribute to secure coding standards and provide training/mentorship to developers

What you bring to the table

  • 8+ years in a developer role focused with strong focus on designing and building security features
  • Extensive RBAC/ABAC knowledge and implementation experience
  • Experience with user, agent, and machine authentication workflows.
  • Hands-on experience with secure coding, OWASP Top 10, and threat modeling
  • Strong developer skills and extensive experience shipping code to production.
  • Experienced in CI/CD, IaC, Python and Go.
  • Track record of balancing pragmatism and security rigor in a fast-paced team
  • Thorough knowledge of authentication and authorization protocols (e.g., OAuth, OpenID Connect, SAML, LDAP, etc.).
  • Strong communication skills, comfortable working across development teams and managing multiple initiatives.

Nice to Have Skills

  • Strong understanding of AI security fundamentals
  • Participation in bug bounty programs
  • Familiarity with the BSIMM framework
  • Experience in cloud security including identity and access management and cloud-native services.
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