Ninoo · Remote (worldwide) · Full-time

Product Engineer, Ninoo Builder

Full-stack on the Builder and Ninoo Code: the chat, the live preview, the sandbox runtime and the billing seams behind them.

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About the role

The Builder is Ninoo in a browser. A person describes an app, watches it get built in a live preview and publishes it to their own address. Behind that sits a coding agent, a disposable cloud workspace per project, a code view, imports from GitHub and ZIP, and a single balance shared with the gateway.

You will ship across the whole surface: the Next.js app, the agent harness, the sandbox daemon and the routes that meter tokens and workspace minutes. Small team, direct ownership, a product used every day by the people who build it.

What you’ll do

01Build and refine the Builder's core loop: prompt, plan, edit, preview, publish.
02Improve the agent harness and its tools, and the evals that keep quality from drifting.
03Own parts of the sandbox runtime: workspace lifecycle, file sync, previews and publishing.
04Keep the shared design system consistent across the Builder and the marketing sites.
05Work from real sessions: read traces, find where users get stuck and fix it.

What we look for

Three or more years building web products with TypeScript, React and Next.js.
Comfortable on the server side: Node, Postgres, queues, containers and the AWS pieces around them.
Experience building on top of LLM APIs, including streaming and tool use.
Taste: you notice a 2px misalignment and a 200ms stall, and you fix both.

Nice to have

You have built a coding agent, an IDE feature or a developer tool people paid for.
Experience with container sandboxes, Firecracker or similar isolation.
Design-engineering ability: you can take a rough idea to a finished screen without a handoff.

Apply

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The button opens an email to careers@nicrron.ai with the subject line filled in. Tell us why this role and point us at one thing you have shipped. We reply to every application within a week.

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