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PhysicsX

Senior Software Security Developer – Core Platform Services

PhysicsX · London

Posted about 2 months ago

or apply directly on PhysicsX's site. We never take the application ourselves.

Is this posting real?

This role has been open
66 days
PhysicsX's roles stay open a median of 66 days
Reposted
No
Salary listed
No
26% of PhysicsX's roles list one
Ghost-job risk at PhysicsX
high
33 stale, 2 reposted of 42 open
Hiring momentum
58 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-10-08

Measured from postings appearing on and disappearing from PhysicsX's own greenhouse board since 2026-08-03. Full hiring picture for PhysicsX.

About this role

As a Senior Software Security Developer at PhysicsX, you will focus on writing secure code components and implementing platform security features. Your role involves mentoring the Core Services development team, performing threat modeling, and supporting incident response procedures. You will also contribute to secure coding standards and provide training to developers.

Our read on this posting2.8out of 5
benefits
5/5
freshness
1/5
career value
4/5
role clarity
4/5
pay transparency
0/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of PhysicsX as an employer.

What you need

  • 8+ years in a developer role focused 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

Nice to have

  • 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

What you get

  • Equity options
  • 10% employer pension contribution
  • Free office lunches
  • Enhanced parental leave
  • YellowNest nursery scheme
  • 25 days of Annual Leave (+ Public Holidays)

Worth weighing

  • Strong emphasis on authentication in the role
  • Focus on secure coding and security features may limit exposure to other development areas
  • Fast-paced team environment may require balancing security rigor with pragmatism

Summarised from PhysicsX's posting. Read the full original.

Listed by PhysicsX on their greenhouse job board, last confirmed open on 2026-10-08. PitchMeAI is not the employer.

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