Full-Stack Software Engineer, Design (Visa Sponsorship - San Francisco, USA)

Visa sponsorship available. A growing product team at an early-stage company is building infrastructure for creating and evaluating reinforcement learning environments. The role blends full-stack engineering with product design to make technically complex AI training and evaluation workflows clear and useful. You will work directly with users and with research and engineering teams, and you will have room to work independently.

What you'll do

• Design and build interfaces for the core platform and marketplace, from early concepts through to launch.
• Make agent runs, evaluation results, reward signals and quality feedback easy to understand and act on.
• Work with research and engineering teams to turn complex reinforcement learning and evaluation workflows into practical tools.
• Talk with users, watch where they get stuck, and improve the product based on what you learn.
• Create clear interaction patterns and keep a high bar for usability, visual quality and implementation.

What you need

• At least 3 years in design engineering, product design or a similar role, with a record of shipping product interfaces.
• Primarily full-stack engineering background, including front-end skills and experience turning designs into working interfaces.
• A portfolio of shipped work with strong visual design, plus experience improving products based on user feedback.
• Technical education or strong technical fundamentals, and the ability to explain complex ideas clearly.
• Experience working closely with engineers and researchers. Familiarity with developer tools, data-heavy products, AI agents, evaluations, reinforcement learning or training data is a plus.
• Good product judgment, clear communication, and comfort working independently in an early-stage environment. Experience building reusable interface patterns is valued.

How to apply

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