{"id":4211151,"url":"https://alion.io/job/physicsx-platform-security-engineer","title":"Platform Security Engineer","company":{"id":251,"name":"PhysicsX","domain":"physicsx.ai","url":"https://alion.io/company/physicsx","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":83,"open_postings":40,"ghost_share":0.2,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":98,"computed_at":"2026-11-12T10:38:37Z"}},"role":"Security","role_family":"Security","seniority":"staff","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AI Agents","optional":false},{"name":"CI/CD","optional":false},{"name":"Go","optional":false},{"name":"OWASP Top 10","optional":false},{"name":"Python","optional":false},{"name":"Threat Modeling","optional":false}],"status":"live","first_seen_at":"2026-11-12T20:30:11Z","employer_posted_date":"2026-11-12","last_verified_at":"2026-11-13T01:02:40Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"About us\nRe-architecting Engineering for the Age of Intelligence\n\nPhysicsX 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.\nThe Role\nWe 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.\nWhat you will do\nDesign and implement platform security features and guardrails.\nAct as an SME for security for the Delivery and FDSE’s teams. This includes mentoring, performing threat modeling, security code reviews, security design reviews.\nValidating and performing hands-on work remediating product security vulnerabilities.\nContribute to secure coding standards and provide training/mentorship to developers.\nBuild automations, integrations, and custom agentic agents to secure our platform at scale.\nWhat you bring to the table\n10+ years with a strong focus on application security including design reviews and threat modeling.\nExtensive interest and experience in building agents to augment/assist security teams.\nStrong understanding of AI security fundamentals.\nHands-on experience with secure coding ranging from the OWASP Top 10 to advanced industry-specific threats.\nStrong developer skills and experience shipping code to production in high-stakes environments.\nExperienced in CI/CD, IaC, Python and Go.\nTrack record of balancing pragmatism and security rigor in a fast-paced team.\nStrong communication skills, comfortable working across development teams and managing multiple initiatives.\nNice to Have Skills\nExperience in cloud security and incident response.\nExperience working in restricted environments and US citizenship.\nParticipation in bug bounty programs.\nFamiliarity with the BSIMM framework.\nExperience in cloud security including identity and access management and cloud-native services.\n\nWhat we offer\nBuild what actually matters\nHelp 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.\nLearn alongside exceptional people\nWork 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.\nInfluence over hierarchy\nWe 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.\nSustainable pace, long-term ambition\nBuilding 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.\nAnd it doesn’t stop there …\n Equity options - share meaningfully in the company you’re helping to build.\n 5% contribution to 401(k) - build long-term security with a strong retirement plan.\n Free team lunch 1x/week - good food, great company, and space to connect.\n Private health insurance - comprehensive cover for you, offering total peace of mind.\n 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.\n 20 days of Annual Leave (+ Public Holidays) - because taking time to rest matters.\n Personal development - dedicated support for learning, development, and leveling up over time.\n Gympass / Wellhub (subsidized) - for you and up to 3 family members, supporting both physical and mental wellbeing.\n Flexible Spending Account (FSA) - set aside pre-tax dollars for eligible healthcare expenses.\n Watch this space, we’re continuing to build this as we grow…\nWe 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. \nWe 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. 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