AI agent platform automating business operations.
Fullstack Engineer - Cofounder
Not a pure design role, but this fullstack engineer owns UI/UX end-to-end on the product team — including "novel ways of building human-agent interactions." At a small team with no dedicated designer, this person will shape the entire product experience. Interesting for design engineers who also code backend.
Job description
About Cofounder
Cofounder is an autonomous agent platform that connects to your tools (Gmail, Slack, Notion, Linear, Google Workspace, GitHub, Airtable, etc.) to run workflows end to end. We're building the operating system for one-person, billion-dollar companies.
What you'll own
End-to-end product work across the agent experience: flows, integrations, and UI/UX
Flows: creation, editing, run criteria, execution reliability, and observability
Integrations: add new integrations and deepen existing ones
UI/UX: work on novel, interesting ways of building human<>agent interactions
Product sense for complex UX: making powerful systems feel simple and reliable
Ship features across the stack with a tight feedback loop from real users (frontend + backend)
Improve performance, reliability, and cost across agent runs and flow execution
Build instrumentation, analytics, and developer tooling to speed up iteration
Maintain a high bar for code quality, tests, observability, and documentation
Requirements
4+ years building and shipping user-facing products end to end
Frontend: React/Next.js (or equivalent), TypeScript; component-driven development, performance profiling, accessibility, data fetching/state, optimistic UI and cache invalidation
Backend: Python FastAPI, background workers/queues, webhooks, Postgres (or similar) schema design, transactions, migrations
Solid testing and observability habits (unit/integration tests, metrics, traces, structured logs)
Bias to ship: scope thin slices, deliver quickly, instrument, iterate
Nice to have
Event-driven architectures (Inngest/Temporal), WebSockets/real-time UIs
LLM/agent experience: tool-use patterns, prompt hygiene, guardrails, evaluation
Infra familiarity (Render/Modal/Supabase/Redis Cloud or equivalent), CI/CD, feature flags
Why join
Ship directly to engaged users; your work is visible and high-impact
Build the core of an autonomous agent platform with real integrations and real workloads
Small, elite team; high ownership; fast decisions; zero bureaucracy
About General Intelligence Company
AI agent platform automating business operations.
One of the most ambitious AI agent startups in NYC — building an "operating system for one-person billion-dollar companies." The product is polished, the comp bands are elite-tier, and the team clearly cares about craft. Design will matter enormously as they figure out how humans interact with autonomous agents. High ceiling.
cofounder.co