Software Engineer, Marketing & Web

LLMArena; San Francisco (CA); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Health benefits

Equity

Cutting-edge AI workload

Job summary

Arena Intelligence is seeking a frontend-specialized Software Engineer to own Arena's public web surfaces, including the blog, marketing pages, and the leaderboard UI used by millions to evaluate AI models.

You will own the blog end-to-end using Next.js and Sanity CMS, build marketing pages in the design system, and ensure fast, accessible interfaces with strong SEO and i18n. 6+ years of frontend experience and a portfolio of high‑craft public pages are required.

Qualifications

• 6+ years of frontend engineering experience.
• Portfolio of high-craft public pages.
• Deep skill in React, TypeScript, Next.js, and CSS.
• Able to read an API, extend a route, and follow the request lifecycle in a product codebase.
• Excellent cross-functional communication with designers, marketers, and engineers.
• Evidence of shipping and iterating, with post-launch changes.
• Genuine curiosity about AI evaluation and Arena's mission.

Responsibilities

• Own Arena's public web surfaces end-to-end.
• Build blog, marketing pages, and leaderboard UI.
• Ensure surfaces are fast, accessible, and indexable with i18n.
• Collaborate with design and engineering teams to defend tradeoffs.

Skills

Frontend expert

React

TypeScript

Next.js

CSS / Tailwind

Cross-functional collaboration

Performance optimization

SEO & accessibility

Tools

Sanity CMS

HonoJS

Job description

About Arena Intelligence

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.

About the Role

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. You'll Own the Arena blog end-to-end — Next.js, Sanity CMS, content models, publishing workflows, and the templates authors use every week. 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 readable at a glance. Keep these surfaces fast, accessible, and indexable — Core Web Vitals, SEO, structured data, and the i18n we already run. Build CMS models and internal publishing tools so marketing and content can ship without waiting on engineering for every copy change.

• 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 with precision
• Enough full-stack skill to work in a product codebase. You can read an API, extend a route, and follow the request lifecycle. You are not a backend specialist, and you do not need to beClear 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

Bonus

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

Tech Stack

• Next.js
• React + TypeScript
• Tailwind + ShadCN
• Sanity CMS (blog and marketing pages)
• HonoJS

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.