Applied AI Engineer, Video Agent

About the role

You will make Video Agent better at doing what the user actually asked for, and you will prove it with data. Some weeks that means redesigning a tool the agent calls. Other weeks it means building an eval, running an A/B test, or shipping a new editing experience in React. Pro members see the company and apply now. It opens to everyone on November 1.

What you'll do

• Build the agent. Design the tools, prompts, and context the agent works with. Improve how it plans, how it recovers from mistakes, and how it handles long, multi-turn conversations.
• Measure quality. Build evals and offline replays of real sessions. Run experiments behind feature flags and read the results honestly. Watch real user sessions and agent traces to find where things go wrong.
• Ship across the stack. Build user-facing features in TypeScript and React. Build backend services and long-running workflows in Python and Go.
• Work closely with others. Partner with product managers, designers, and the research and rendering teams that the agent depends on.

What they're looking for

• You have built and shipped an AI agent that real people use. We mean a system where a model calls tools, plans across several steps, and acts on the results. A chat wrapper or a prompt demo is not enough on its own. We...
• You know how to tell whether an AI system got better. You have built evals or test sets for model behavior. You can tell a real improvement from noise, and you are skeptical of results that look too good.
• You are a strong full-stack engineer. You have 2 or more years of professional experience. You are fluent in TypeScript and React on the frontend and Python on the backend.
• You have strong product sense. You use what you build, you care how it feels, and you look at how customers actually use it.
• You take ownership. You do not wait for a spec. You find the most important problem, fix it, and tell people what changed.
• A degree in computer science or a related field is welcome but not required. Equivalent experience counts.

Nice to have

• You have fine-tuned models before.
• You have worked on code-to-video models, which generate video by writing code such as HTML or animation scripts.
• You have worked on video agent models in general.
• Show us an agent you’ve built