Senior Product Security Engineer
LMArena
full-time
Posted on:
Location Type: Hybrid
Location: Bay Area • California • 🇺🇸 United States
Visit company websiteJob Level
Senior
Tech Stack
Distributed SystemsGoJavaScriptNode.jsPythonTypeScript
About the role
- Own the product security vision for LMArena, ensuring security and trust are core to every stage of our product lifecycle.
- Design and implement platform-wide security features, including Sybil resistance, bot detection, reputation systems, and anti-abuse primitives.
- Lead threat modeling and security architecture reviews for new and existing product features.
- Collaborate with infrastructure and product engineering to design secure APIs, data flows, and identity systems that scale.
- Improve developer velocity by creating secure-by-default frameworks and tooling for internal teams.
- Partner with incident response to quickly assess, contain, and remediate security events, and lead deep postmortems to improve defenses.
- Stay ahead of the curve by monitoring emerging attack techniques and applying cutting-edge security research to our platform.
- Mentor engineers across the company on secure coding practices, architecture trade-offs, and operational security.
Requirements
- 8+ years of experience in software engineering or security engineering, including staff-level scope in securing large-scale, user-facing platforms.
- Proven track record designing and implementing systems to detect, mitigate, and prevent adversarial behavior (bots, Sybil attacks, automated abuse).
- Strong experience with threat modeling, secure architecture design, and risk assessment.
- Hands-on experience building security features into production systems at scale (millions of DAU / billions of requests).
- Proficiency in backend development (Node.js, TypeScript, Python, or Go) and willingness to work across the stack when needed.
- Strong knowledge of distributed systems security, identity, and authentication mechanisms.
- Excellent communication skills, able to build alignment across engineering, product, and leadership teams.
Benefits
- Comprehensive health and wellness benefits, including medical, dental, vision, and additional support programs.
- Competitive compensation and equity aligned to the markets where our team members are based.
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard skills
threat modelingsecure architecture designrisk assessmentbackend developmentNode.jsTypeScriptPythonGodistributed systems securitysecure coding practices
Soft skills
communicationmentoringcollaborationleadershipproblem-solvingalignment buildingincident responsepostmortem analysisdeveloper velocity improvementsecurity research application