Full Stack Software Engineer
US$100,000 – US$225,000 / yr base salary
Posted 21 Aug 2026
Advertised as “Full-Stack Software Engineer, Reinforcement Learning”
BranchFactor Summary
The original posting with the fluff stripped out
- Management level
- Individual contributor
- Employment
- On-Site
- Contract
- Full-time
- Visa sponsorship
- Offered
| Base salary | US$100,000 – US$225,000 / yr |
|---|
About HUD
HUD's mission is to build reliable, fair and open infrastructure for AI data. We want data to be valuable for the people who create it and trustworthy for the labs that train on it. Our team is a quickly growing group of researchers, engineers and operators building the economy that shapes what AI will become. Backed by $16M from top VCs and YC (W25), our marketplace and platform are used by startups, Fortune 500 companies and frontier labs.
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
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Develop product-facing tools for browsing environments, inspecting trajectories, reviewing task quality, debugging failures, and understanding model behavior
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Build vendor-facing workflows that make it easy for external partners to create, submit, test, and iterate on RL environments and training data
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Create dashboards and observability tools that surface environment quality, eval results, data collection progress, grader issues, reward signal problems, and pipeline health
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Design backend services and APIs that connect task authoring, data collection, evaluation, QA/QC, and RL training infrastructure
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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:
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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
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Experience owning user-facing or internal products end-to-end
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Good product taste and the ability to build tools that are intuitive for both technical and non-technical users
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Comfort with cloud infrastructure, Docker, CI/CD, observability, and production debugging