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.
What we offer
Build what actually matters
Help shape an AI-native engineering company at a formative stage, tackling problems that genuinely matter for industry and society. This is work with real-world impact - and something you can be proud to stand behind.
Learn alongside exceptional people
Work with a high-caliber, collaborative team of engineers, scientists, and operators who care deeply about doing great work, and about helping each other get better. We come from diverse backgrounds, but we share a commitment to operating at the highest level and addressing some of the most complex challenges out there. If you’re ambitious, thoughtful, and driven by impact, you’ll feel at home.
Influence over hierarchy
We operate with a flat structure: good ideas win - wherever they come from. Questioning assumptions and challenging the status quo isn’t just welcomed, it’s expected.
Sustainable pace, long-term ambition
Building meaningful technology is a marathon, not a sprint. We believe in balancing focused, ambitious work with a life beyond it. Our hybrid model blends time together in our Shoreditch office with work-from-home days, giving you the flexibility to work sustainably while staying connected in person.
And it doesn’t stop there …
🚀 Equity options - share meaningfully in the company you’re helping to build.
🏦 10% employer pension contribution - because investing in future matters.
🍽️ Free office lunches - to keep you energised and focused.
👶 Enhanced parental leave - 3 months full pay paternity and 6 months full pay maternity leave, to provide extra flexibility during the moments that matter most.
🍼 YellowNest nursery scheme - to help working parents manage childcare costs.
☀️ 25 days of Annual Leave (+ Public Holidays) - because taking time to rest matters.
🏥 Private medical insurance - 100% employee cover, giving you complete peace of mind.
💪 Wellhub Subscription - gain access to thousands of gyms, classes and wellness apps, supporting both physical and mental wellbeing.
👀 Eye tests - because good work depends on good health.
📈 Personal development - dedicated support for learning, development, and leveling up over time.
💛 Employee Assistance Programme (EAP) - confidential wellbeing support, available whenever you need it.
🚲 Bike2Work scheme and 🚆 Season ticket loan - to make getting to work easier and greener.
🚗 Octopus EV salary sacrifice - for a simpler, more sustainable way to drive electric.
🔎 Watch this space, we’re continuing to build this as we grow…
Skills Required
- 8+ years in a developer role focused on designing and building security features
- Extensive RBAC and 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 with extensive experience shipping code to production
- Experience in CI/CD and Infrastructure as Code (IaC)
- Proficiency in Python and Go
- Thorough knowledge of authentication and authorization protocols (OAuth, OpenID Connect, SAML, LDAP)
- Strong communication skills and ability to work across development teams
- 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 We Do
PhysicsX is a deep-tech company of scientists and engineers, developing machine learning applications to accelerate physics simulations and enable a new frontier of optimization opportunities in design and engineering. Born out of numerical physics, we help our customers radically improve their concepts and designs, transform their engineering processes and drive operational product performance. We do this in some of the most advanced and important industries of our time – including Space, Aerospace, Medical Devices, Additive Manufacturing, Electric Vehicles, Motorsport, and Renewables. Our work creates positive impact for society, be it by improving the design of artificial hearts, reducing CO2 emissions from aircraft and road vehicles, and increasing the performance of wind turbines. We are currently recruiting for multiple positions, however please only apply for the role that best aligns with your skillset and career goals. We do not currently offer work experience
