Senior full-stack design engineer

About the Role

Join a product team at an early-stage AI infrastructure startup to design and build interfaces for tools used to create and evaluate AI agent environments. You will work across product design and front-end engineering, making technically complex workflows clear and actionable while helping shape how people work with AI systems.

What You'll Do

• Design and build product interfaces from early concepts through release.
• Make agent runs, evaluation results, reward signals, and quality feedback understandable and useful.
• Partner with research and engineering to turn reinforcement learning and evaluation workflows into practical tools.
• Talk with users, identify where they struggle, and improve the product based on feedback.
• Create reusable interaction patterns and maintain strong usability, visual quality, and implementation standards.

What We're Looking For

• At least 3 years of experience in design engineering, product design, or a similar role shipping product interfaces.
• Hands-on front-end engineering skills and experience turning designs into working interfaces. No specific programming stack is listed.
• A portfolio of shipped design engineering work and a track record of learning from user feedback.
• Experience working closely with engineers and researchers on product development.
• Strong product and interaction design judgment, clear communication, and comfort working with technical concepts.
• Experience with developer tools, data-rich products, research software, AI agents, evaluations, reinforcement learning, or training data is valuable.

Compensation & Benefits

Annual salary range: $130,000 to $225,000. Visa sponsorship is available.

Location

Based in San Francisco, California. The role may be on-site or remote.