Software Engineer, Marketing & Web

Arena is the platform for evaluating how AI models perform in the real world. Founded by researchers from UC Berkeley's SkyLab, we're on a mission to measure and advance the frontier of AI for real-world use, and to build the foundation for everyone to understand, shape, and benefit from it.

Tens of millions of people use Arena each month to evaluate how frontier systems handle the work they actually do. The preferences they share power the most transparent, rigorous, and human-centered evaluations in AI. Leading AI labs, enterprises, and independent researchers rely on our work and open datasets to understand how models behave in real workflows: agentic coding, creative generation, professional productivity, and beyond. We go beyond leaderboards and decompose what human experience reveals about AI, so models advance toward the work people actually do.

We're a team of researchers, academics, builders, and creatives from UC Berkeley, Google, Stanford, and DeepMind. We seek truth, move fast, and value craftsmanship, curiosity, and impact over hierarchy. We're building a company where thoughtful, curious people from all backgrounds can do their best work together, in an office culture that radiates excellence, energy, and focus.

We're looking for a frontend-specialized Software Engineer to own Arena's public web surfaces: the blog, marketing pages, and the leaderboard UI that millions of people use to judge how AI models perform.

• Own the Arena blog end-to-end

• Build and maintain marketing pages (product, features, resources, careers, campaign pages) in the same design system as the product

• Improve the public leaderboard frontend: tables, charts, filters, and the UX that makes evaluation data accessible

• Keep these surfaces fast, accessible, and indexable

• Build CMS models and internal publishing tools so marketing and content can ship without waiting on engineering

• 6+ years of software engineering, with most of that time on production frontend

• A portfolio or shipped work that shows high-craft public pages: marketing sites, content sites, or data-dense product UI

• Deep skill in React, TypeScript, Next.js, and CSS — you can implement complex layouts, motion, and responsive design

• Enough full-stack skill to work in a product codebase. You can read an API, extend a route, and follow the request lifecycle

• Clear communication with designers, marketers, and engineers — you can defend a tradeoff and explain it to a non-engineer

• Evidence of shipping and iterating. You can describe a page or surface you owned, what happened after launch, and what you changed

• Genuine curiosity about AI evaluation and Arena's mission. You have looked at arena.ai and can say why this public surface matters

• Experience with a headless CMS (Sanity, Contentful, or similar): content modeling, structured data, and the operational side of a live site

• Leaderboards, data tables, or visualization work (charts, ranking UIs, dense filterable tables)

• SEO, Core Web Vitals, structured data / JSON-LD

• Animation (Motion, GSAP, or CSS) used with restraint

• You've shipped without a dedicated PM — took a brief from marketing or design and drove it to production

• Next.js

• React + TypeScript

• Tailwind + ShadCN

• Sanity CMS (blog and marketing pages)

• HonoJS