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
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 & Tools

threat modelingsecure architecture designrisk assessmentbackend developmentNode.jsTypeScriptPythonGodistributed systems securityauthentication mechanisms

Soft Skills

communicationmentoringcollaborationleadership