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 $16M from top VCs and were YC W25.
About the role
We’re looking for a Full-Stack Software Engineer, Reinforcement Learning to build the product surfaces, backend systems, and internal tools that power HUD’s RL data engine.
You’ll own product surfaces end-to-end, including backend services, APIs, databases, dashboards, tools, vendor workflows, data collection, and observability for RL rollouts. You don’t need to be a researcher, but you need to work research engineers and vendors to translate ambiguous needs into polished products that enable our RL systems.
Responsibilities
Develop product-facing tools for browsing environments, inspecting trajectories, reviewing task quality, debugging failures, and understanding model behavior
Build vendor-facing workflows that make it easy for external partners to create, submit, test, and iterate on RL environments and training data
Create dashboards and observability tools that surface environment quality, eval results, data collection progress, grader issues, reward signal problems, and pipeline health
Design backend services and APIs that connect task authoring, data collection, evaluation, QA/QC, and RL training infrastructure
Partner closely with research, operations, and GTM teams to turn vague, high-stakes requests into well-designed systems that ship quickly
Experience
You may be a good fit if you have:
Strong software engineering fundamentals and real full-stack range, including proficiency in Python and a modern web stack such as React, TypeScript, Next.js, or similar
Experience owning user-facing or internal products end-to-end
Good product taste and the ability to build tools that are intuitive for both technical and non-technical users
Comfort with cloud infrastructure, Docker, CI/CD, observability, and production debugging
High agency—you identify what needs to exist, build it, and improve it without waiting for a perfect spec
Strong communication skills for working across research, engineering, operations, vendors, and founders
Strong candidates may also have:
Experience building data collection, labeling, annotation, eval, or research tooling platforms
Experience building dashboards, review workflows, observability tools, or debugging interfaces for complex systems
Experience building developer tools, infrastructure products, internal platforms, or workflow products that made a team dramatically faster
Experience with AWS, Kubernetes, Terraform, Docker, Grafana, or similar infrastructure tools as tools to ship product, not as the center of the role
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 only, for now. You can join the team in the San Francisco Bay Area or Singapore offices.
Visa Sponsorship
: We provide support for relocation and visas for strong full-time candidates to the US or Singapore.
Timeline
: Applications are rolling. The process is 2 technical interviews and a 2-3 day work trial.
What we offer
Competitive compensation
100% covered top-of-the-line medical, dental, and vision from Blue Shield of CA (US employees)
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 (US employees)
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 [[email removed]](mailto:[email removed]) or elsewhere if we missed your application!
Visa: US citizen/visa only.