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Arena

Arena

Crowdsourced AI model evaluation and leaderboard platform

16 open roles
aiSan Francisco, CA51-200Series AFounded 2023

About

Arena builds a community-driven platform where users compare frontier AI models side-by-side via real-world prompts, vote on preferences, and generate public leaderboards across text, vision, code, and more. It serves builders, researchers, enterprises, and model labs seeking reliable human-feedback-based evaluations beyond traditional benchmarks. This shapes AI progress transparently through millions of organic votes and powers enterprise eval services.

Tech stack

PythonPyTorchSQLTypeScriptTensorFlowSparkSupabaseJAXpandasNumPyDatabricksSnowflakeDelta LakeNode.jsGo

Open roles

16
Arena

Associate General Counsel

ArenaCalifornia

Embedded legal partner to product and engineering teams at an AI evaluation platform. Own global privacy compliance (GDPR, CCPA), advise on AI governance and responsible development, negotiate data agreements, and build scalable legal processes and tools. Requires JD, 8+ years privacy/product counseling experience, technical fluency in AI/ML, and hands-on tool-building ability.

Salary not listed
Hybrid8+ YOELegal
Arena

Growth Marketing Manager, Email and Lifecycle

ArenaCalifornia

Own Arena's email and lifecycle marketing strategy to drive user activation, retention, and engagement for millions of AI practitioners. Build and optimize multi-channel programs, partner with Product/Engineering on infrastructure, run experiments, and write technical copy.

Salary not listed
Hybrid5+ YOEGrowth Marketing
Arena

Data Scientist

ArenaCalifornia

Data Scientist designing and analyzing A/B tests, causal inference experiments, and retention frameworks (cohorts, churn, DAU/WAU/MAU) to drive product growth and user engagement at Arena Intelligence. Requires 3+ years in experimentation, strong stats background, SQL/Python/PySpark skills.

150k – 350k/yr
Hybrid3+ YOEData Science
Arena

People Operations Lead

ArenaUnited States

Design and scale HR programs including onboarding, performance, and compensation while serving as an HR business partner to leadership in a fast-moving AI startup.

Salary not listed
Hybrid6+ YOEPeople Ops
Arena

Assistant Controller

ArenaCalifornia

Builds accounting function from scratch for high-growth AI startup, owning financial closes, revenue recognition under ASC 606, ERP implementation, internal controls, and audit readiness. Requires 8+ years experience, CPA, GAAP expertise, and hands-on builder mindset with AI workflow integration.

Salary not listed
Hybrid8+ YOEFinance & Accounting
Arena

Security Engineer, Anti-Abuse

ArenaSan Francisco, CA +1

Builds detection, enforcement, and investigation systems to protect AI evaluation platform from abuse, bots, sybils, rating manipulation, and AI-specific harms like jailbreaks. Requires 6+ years production engineering under adversarial conditions, strong SQL, backend proficiency.

Salary not listed
Hybrid6+ YOESecurity Engineering
Arena

Senior Software Engineer, Product

ArenaSan Francisco, CA +1

Senior Software Engineer owns end-to-end product features across full stack, from scoping and building to deployment and iteration based on user feedback. Collaborates with ML researchers and requires 4+ years experience in product development with web apps.

Salary not listed
Hybrid4+ YOEFullstack Engineering
Arena

Product Solutions Engineer

ArenaSan Francisco, CA +1

Partners with AI labs to integrate models, run evaluations, and deliver results while building custom engineering solutions across the stack to address customer needs and push platform capabilities.

Salary not listed
Hybrid4+ YOESolutions Architecture
Arena

Analytics Engineer

ArenaSan Francisco, CA +1

Designs and builds analytics data models, pipelines, and metrics from raw AI evaluation data. Partners with product and research teams to ensure scalable, high-quality data for insights and dashboards. Requires 3+ years experience with SQL, Python, Airflow, and modern data warehouses.

Salary not listed
Hybrid3+ YOEData Engineering
Arena

Technical Recruiter

ArenaSan Francisco, CA +1

Technical Recruiter partners with hiring managers on full-cycle recruiting for deep-tech roles, focusing on sourcing passive talent in ML and research, building pipelines, and driving process excellence in a hybrid environment.

Salary not listed
Hybrid10+ YOERecruiting
Arena

Senior Software Engineer, ML Infrastructure

ArenaSan Francisco, CA

Leads design and development of scalable, real-time API and data infrastructure for AI model evaluations, processing large-scale event streams with low latency. Requires 5+ years in infrastructure or ML systems, expertise in distributed systems, stream processing, and backend architecture.

Salary not listed
Hybrid5+ YOEML Engineering
Arena

Staff Software Engineer, Product

ArenaSan Francisco, CA +1

Staff Software Engineer owns entire product areas end-to-end at an AI evaluation platform, designing full-stack systems, making high-stakes technical decisions, shipping features, and driving measurable impact. Requires 8+ years experience with deep technical expertise in web apps and product judgment.

Salary not listed
Hybrid8+ YOEFullstack Engineering
Arena

Senior Software Engineer, Data Infrastructure

ArenaSan Francisco, CA +1

Build and scale data pipelines to process millions of user votes for AI model evaluation. Partner with researchers to deliver insights via dashboards, ensuring data quality and reliability in a fast-paced environment. Requires 5+ years in data engineering with big data tools.

Salary not listed
Hybrid5+ YOEData Engineering
Arena

Founding Product Security Engineer

ArenaSan Francisco, CA +1

Leads product security strategy, designs and implements identity, auth, and secure inference paths for a large-scale AI evaluation platform. Requires 6+ years securing user-facing systems with backend proficiency and threat modeling expertise.

210k – 320k/yr
Hybrid6+ YOESecurity Engineering
Arena

Machine Learning Scientist - Open Source Lead

ArenaSan Francisco, CA +1

Leads open-source ML research by designing experiments, developing evaluation methodologies, analyzing preference data, and releasing datasets/code to advance AI model transparency. Requires PhD-level expertise in ML/LLMs and hands-on experience with RLHF/DPO fine-tuning.

Salary not listed
HybridAI Research
Arena

Machine Learning Scientist

ArenaSan Francisco, CA +1

Designs and conducts experiments to evaluate AI models using human preference data, develops new metrics and methodologies, and analyzes large-scale interaction data to advance model reliability and alignment.

Salary not listed
HybridAI Research