Full-Stack Engineer (Front-End Spike)

About HUD

HUD is building infrastructure to create RL training data and evals for frontier AI agents, as well as a marketplace to sell these to frontier labs through the HUD marketplace. Our platform is used by frontier labs, Fortune 500 companies, and startups. We’ve raised $15M from top VCs and were YC W25.

About the role

We’re looking for a full-stack engineer who spikes in front-end to build a polished user experiences for a high-performing product.

Responsibilities

Build and ship end-to-end product features across frontend and backend, with a strong emphasis on user experience

Translate product and design requirements into high-quality, intuitive user interfaces with strong attention to detail

Optimize applications for performance, responsiveness, and cross-browser compatibility

Develop and maintain backend services and APIs that power core product functionality

Talk directly with customers, understand their workflows, and turn messy real world feedback into product improvements

Experience

You may be a good fit if you have:

Strong experience owning products end-to-end and working across the stack

Evidence of rapid learning and adaptability in technical environments (e.g., programming competitions)

A portfolio of shipped products, side projects, or live demos that demonstrate your frontend craftsmanship

Startup experience in early-stage technology companies with ability to work independently in fast-paced environments

Familiarity with current AI tools and LLM capabilities

Strong communication skills for remote collaboration across time zones

Strong candidates may also have:

A standout portfolio showcasing exceptional UI/UX work, interaction design, or creative engineering

Experience with reinforcement learning, post-training, or model training workflows

Familiarity with product analytics tools and experimentation (e.g., A/B testing)

We prioritize technical aptitude and learning potential over years of experience. Motivated candidates are encouraged to apply even if they don't meet all criteria.

Team & company details

Team Size: ~15 people currently, mostly full-time in-person, but some remote.

Our team: Our team includes 4 International Olympiad medalists (IOI, ILO, IPhO), serial AI startup founders, and researchers with publications at ICLR, NeurIPS, etc.

Company stage: We have 8 figures in funding and high revenue growth. We’re scaling profitably and quickly to meet very strong demand.

Logistics

Employment: Full-time.

Location: On-site in the San Francisco Bay Area.

Visa Sponsorship: We provide support for relocation and visas for strong full-time candidates to the US.

Timeline: Applications are rolling. The process is 2 technical interviews and a 1-week work trial.

What we offer

Competitive compensation

100% covered top-of-the-line medical, dental, and vision from Blue Shield of CA

Lunch and dinner when you’re in the office

Company-wide holiday break (Christmas Eve to New Year’s Day) on top of PTO and paid holidays

Other perks including an Equinox membership, 401k, and commuter benefits

Unlimited access to tokens for ChatGPT, Claude Code, Cursor, etc. By unlimited, we mean no one on our token usage leaderboard has ever hit a limit. So we have no idea what the limit is.

Due to high volume, we may not actively respond to every application, but feel free to contact us at recruiting@hud.so or elsewhere if we missed your application!