Arena

3 months ago

Software Engineer, Anti-Abuse

✓ Verified Job

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

Source: Company careers pageValidated by: Fursa AI

Last checked: 1 hour agoStatus: Live

Job Summary

Lead the design and implementation of end-to-end abuse detection, enforcement, and investigation systems for Arena’s platform. Own the abuse vision, build detection for bots and coordinated manipulation, implement humane enforcement, and ensure safe, trusted leaderboards across product launches while collaborating with security, policy, and leadership.

Location: San Francisco

Workplace: Hybrid

Employment Type: Full time

Job Function: Entrepreneurship & Venture Building

Seniority: Sr. Manager level

Key Responsibilities

•Own the abuse vision for Arena: what gets detected, what gets enforced, how fast, and with what false-positive budget
•Design and operate detection for bots, sybils, coordinated inauthentic voting, and rating-system manipulation — the integrity of Arena's leaderboards is the product
•Build enforcement primitives (rate limits, challenges, shadowbans, account actions, model-side refusals) that are reversible, auditable, and humane
•Detect and mitigate inference abuse and cost exploitation at the platform layer
•Build jailbreak and multi-provider misuse detection across the models Arena serves, and partner with model-provider trust & safety teams on signal-sharing and escalation

Key Requirements

•6+ years of production software engineering experience, including building and operating systems under adversarial conditions
•Shipped experience in at least one of: trust & safety, anti-abuse, anti-fraud, anti-spam, integrity, or risk engineering
•Strong SQL and data-analysis skills — this role is 30%+ pattern-finding and investigation, not just shipping code
•Proficiency in a modern backend language (Node.js, TypeScript, Python, or Go)
•Excellent communication — you'll build alignment with engineering, product, policy, and leadership routinely

Experience:6+ yearsTrust & safetyAnti-abuseAnti-fraudIntegrityRisk engineering

Skills:Node.jsTypeScriptPythonGoSQLCommunicationProblem-solving

Tech Stack:Node.jsTypeScriptPythonGoSQL

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

Website LinkedIn

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Arena

3 months ago

Software Engineer, Anti-Abuse

✓ Verified Job

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

Source: Company careers pageValidated by: Fursa AI

Last checked: 1 hour agoStatus: Live

Job Summary

Location: San Francisco

Workplace: Hybrid

Employment Type: Full time

Job Function: Entrepreneurship & Venture Building

Seniority: Sr. Manager level

Key Responsibilities

•Own the abuse vision for Arena: what gets detected, what gets enforced, how fast, and with what false-positive budget
•Design and operate detection for bots, sybils, coordinated inauthentic voting, and rating-system manipulation — the integrity of Arena's leaderboards is the product
•Build enforcement primitives (rate limits, challenges, shadowbans, account actions, model-side refusals) that are reversible, auditable, and humane
•Detect and mitigate inference abuse and cost exploitation at the platform layer
•Build jailbreak and multi-provider misuse detection across the models Arena serves, and partner with model-provider trust & safety teams on signal-sharing and escalation

Key Requirements

•6+ years of production software engineering experience, including building and operating systems under adversarial conditions
•Shipped experience in at least one of: trust & safety, anti-abuse, anti-fraud, anti-spam, integrity, or risk engineering
•Strong SQL and data-analysis skills — this role is 30%+ pattern-finding and investigation, not just shipping code
•Proficiency in a modern backend language (Node.js, TypeScript, Python, or Go)
•Excellent communication — you'll build alignment with engineering, product, policy, and leadership routinely

Experience:6+ yearsTrust & safetyAnti-abuseAnti-fraudIntegrityRisk engineering

Skills:Node.jsTypeScriptPythonGoSQLCommunicationProblem-solving

Tech Stack:Node.jsTypeScriptPythonGoSQL

Company Brief

Arena

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

Website LinkedIn