Software Engineer, Product Security

Arena
San Francisco
Workplace: RemoteFull timeFunction: CybersecurityExperience: 8+ yearsSkills: ["Communication","Mentoring","Leadership","Collaboration","Problem-solving"]

Senior Product Security Engineer to lead strategy, design, and hands-on implementation of platform security for an AI-focused product. You will own security vision across the product lifecycle, design platform-wide protections (Sybil resistance, bot detection, reputation, anti-abuse), perform threat modeling, collaborate on secure APIs and data flows, and mentor engineers while staying ahead of emerging attack techniques.

Loading

Loading job details...

Preparing the role view and application actions.

FursaFursa
Arena
Arena
8 months ago

Software Engineer, Product Security

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 18 hours agoStatus: Live

Job Summary

Senior Product Security Engineer to lead strategy, design, and hands-on implementation of platform security for an AI-focused product. You will own security vision across the product lifecycle, design platform-wide protections (Sybil resistance, bot detection, reputation, anti-abuse), perform threat modeling, collaborate on secure APIs and data flows, and mentor engineers while staying ahead of emerging attack techniques.
Location: San Francisco
Workplace: Remote
Employment Type: Full time
Job Function: Cybersecurity
Seniority: Sr. Manager level

Key Responsibilities

  • •Own the product security vision for LMArena across the 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 features.
  • •Collaborate with infrastructure and product engineering to design secure APIs, data flows, and identity systems that scale.
  • •Mentor engineers on secure coding practices, architecture trade-offs, and operational security.

Pay and Benefits

Equity and Bonus:Equity
Perks:Equity

Key Requirements

  • •8+ years of experience in software engineering or security engineering
  • •proven track record designing systems to detect and prevent adversarial behavior (bots, Sybil attacks)
  • •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
Experience:8+ yearsSecuritySoftware securityAI security
Skills:CommunicationMentoringLeadershipCollaborationProblem-solving
Languages:English
Tech Stack:Node.jsTypeScriptPythonGoSecurityIdentityAuthentication

Company Brief

Arena
LMArena operates a community-driven platform for evaluating and benchmarking large language models via crowdsourced pairwise comparisons and leaderboards, used by researchers and AI labs to measure real-world model performance. ([linkedin.com](https://www.linkedin.com/company/lmarena?utm_source=openai))
Industry: Developer Tools
Company Size: Small (11 to 50 employees)
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series A
Headquarters: San Francisco, United States
Founded: 2025
WebsiteLinkedIn