Staff Software Engineer, Product

Staff Software Engineer

We're looking for a Staff Software Engineer to own entire product areas at Arena — identifying what to build, designing and shipping the solution, driving it to measurable outcomes, and raising the bar for the team along the way. This is a hands-on IC role. You are the architect, not the delegator. You write code, design systems, and ship product — and you have a track record of doing this repeatedly with clear, attributable impact.

You'll:

• Own product areas end-to-end — from identifying opportunities that aren't on anyone's roadmap, to building conviction, shipping, and driving to measurable outcomes
• Design complete systems: data model, API design, frontend architecture (full-stack) or backend services and infrastructure (backend), and deployment strategy
• Make high-stakes technical decisions under uncertainty — build-vs-buy, monolith-vs-service, when to prototype and when to harden — and be accountable for the outcomes
• Work with ML researchers to turn research services into reliable, product-consumable systems
• Ship and iterate — you don't hand off after v1. You measure, course-correct, and drive to sustained impact
• Raise the technical and product quality bar on the team — introduce practices others adopt, unblock teammates, and create clarity out of ambiguity
• Navigate cross-functional collaboration with product, design, research, and leadership to align on what matters

You'll have:

• 8+ years of experience in software engineering, with a focus on product development
• Deep experience building web applications spanning data model, API, frontend architecture, and deployment. You can design complete systems end-to-end and explain why you rejected alternatives at each decision point. You can explain how your architecture decisions shaped the product's capabilities and measurably improved product quality or team velocity.
• A track record of repeated, attributable impact — multiple projects across different roles or companies where you can quantify outcomes (revenue, engagement, efficiency) and the impact sustained after you moved on
• Personal technical depth, not delegation — you are the architect. You've dealt with real performance issues: slow queries, N+1 problems, caching, transaction isolation. You can go three levels deep on any decision and get more specific, not vaguer.
• Product judgment and autonomous ownership — you've identified opportunities, validated them with evidence, built buy-in, shipped, and the bet paid off. You know when to prototype, harden, or kill work.
• Clear, persuasive communication — you build buy-in across engineering, product, and leadership. You create clarity for others, not just yourself.
• Genuine conviction about AI evaluation and Arena's mission — you can articulate why this domain matters and where the product should go

Bonus Points:

• Production experience with AI/LLM systems — inference pipelines, evaluation workflows, model integration, or AI-powered product features
• Familiarity with our stack: NextJS, React, TypeScript, Tailwind, ShadCN, HonoJS, Postgres, Vitest
• Experience with Supabase or Vercel's AI SDK
• You've raised the bar on a team with measurable before/after — introduced practices, tools, or standards that others adopted

Our Tech Stack:

• NextJS
• React + TypeScript
• Tailwind + ShadCN
• HonoJS
• Postgres
• Vitest

What We Offer:

• We offer competitive compensation and equity aligned to the markets where our team members are based. The base salary range will depend on the candidate's permanent work location.
• Comprehensive health and wellness benefits, including medical, dental, vision, and additional support programs.
• The opportunity to work on cutting-edge AI with a small, mission-driven team
• A culture that values transparency, trust, and community impact

Come help build the space where anyone can explore and help shape the future of AI.

Arena Intelligence provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, genetics, sexual orientation, gender identity, or gender expression. We are committed to a diverse and inclusive workforce and welcome people from all backgrounds, experiences, perspectives, and abilities.