AI Product Engineer — Build Usage

Builds Build Usage end to end, from the Python and FastAPI backend that computes NEXUS plan tiers and session and weekly limits to the vanilla JavaScript frontend that renders them. Wires live usage into the page over real-time WebSocket updates and exposes it to AI agents through API and MCP so an agent can read its own remaining budget.

⭐ Bonus points for any apps built on the platform using "Build it Better"

💰 Salary: $150,000 – $220,000 USD / year · Remote OK

What you'll do

• Implement backend endpoints that resolve plan tier, live session use and weekly limits for Free, Pro, Max 5x and Max 20x
• Build the vanilla JavaScript frontend that renders usage and limit state
• Stream live usage to the page with real-time WebSocket updates rather than polling
• Expose usage data to AI agents through API and MCP interfaces
• Keep every displayed figure correct and consistent between backend and frontend

What you bring

• Strong Python and FastAPI backend skills
• Proficiency with vanilla JavaScript and real-time WebSocket data on the frontend
• Experience exposing features to AI agents via API and MCP
• Care for numeric accuracy and end-to-end feature ownership

Try the app

cymetica.com/usage

This role is part of AI Product Engineer — EventTrader AI Apps.