Platform Security Engineer
Confirmed on the employer's own hiring board on Nov 13, 2026. First seen by Alion on Nov 12, 2026. PhysicsX scores B on the Alion truth index.
About us
Re-architecting Engineering for the Age of Intelligence
PhysicsX is the physics AI company for industrials. The company’s mission is to accelerate hardware innovation by overhauling what industrial engineering and manufacturing look like today. PhysicsX is building a new simulation software stack to deliver deep physics AI enablement across the entire engineering lifecycle. The company partners with leading organisations in aerospace & defence, automotive, semiconductors, materials, and energy & renewables, supporting them on some of their most critical and complex challenges. PhysicsX is headquartered in the United Kingdom, with offices in London, New York, and Singapore and an expanding presence in the Bay Area.
The Role
We are recruiting for a Product Security Engineer to support our FDSE’s and delivery teams. You will be responsible primarily for threat modeling, security design reviews, assessing vulnerabilities and building agents for scaling the platform security function.
What you will do
- Design and implement platform security features and guardrails.
- Act as an SME for security for the Delivery and FDSE’s teams. This includes mentoring, performing threat modeling, security code reviews, security design reviews.
- Validating and performing hands-on work remediating product security vulnerabilities.
- Contribute to secure coding standards and provide training/mentorship to developers.
- Build automations, integrations, and custom agentic agents to secure our platform at scale.
What you bring to the table
- 10+ years with a strong focus on application security including design reviews and threat modeling.
- Extensive interest and experience in building agents to augment/assist security teams.
- Strong understanding of AI security fundamentals.
- Hands-on experience with secure coding ranging from the OWASP Top 10 to advanced industry-specific threats.
- Strong developer skills and experience shipping code to production in high-stakes environments.
- Experienced in CI/CD, IaC, Python and Go.
- Track record of balancing pragmatism and security rigor in a fast-paced team.
- Strong communication skills, comfortable working across development teams and managing multiple initiatives.
Nice to Have Skills
- Experience in cloud security and incident response.
- Experience working in restricted environments and US citizenship.
- 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 New York 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.
5% contribution to 401(k) - build long-term security with a strong retirement plan.
Free team lunch 1x/week - good food, great company, and space to connect.
Private health insurance - comprehensive cover for you, offering total peace of mind.
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.
20 days of Annual Leave (+ Public Holidays) - because taking time to rest matters.
Personal development - dedicated support for learning, development, and leveling up over time.
Gympass / Wellhub (subsidized) - for you and up to 3 family members, supporting both physical and mental wellbeing.
Flexible Spending Account (FSA) - set aside pre-tax dollars for eligible healthcare expenses.
Watch this space, we’re continuing to build this as we grow…
We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity. We strongly encourage individuals from groups traditionally underrepresented in tech to apply. To help make a change, we sponsor bright women from disadvantaged backgrounds through their university degrees in science and mathematics.
We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with employment and equality legislation. This information is confidential, used only in aggregate form, and will not influence the outcome of your application.