Fullstack Engineer - Cofounder
generalintelligencecompany
Early in your career, you want to pick a role where you can own something real. This fullstack position at Cofounder gives you end-to-end visibility: you'll ship features across frontend and backend, see users interact with them the same week, and iterate fast. That's how you actually learn engineering.
You'll work on the agent platform itself—the flows people create, the integrations that connect tools like Gmail and GitHub, and the UI that makes autonomous workflows feel simple instead of overwhelming. This means React/Next.js on the frontend, backend systems for reliability and observability, and the product thinking required to make complex systems work for real people.
We're looking for someone with at least 4 years shipping user-facing products end to end. You know TypeScript, component-driven development, and performance. You can debug across the stack and care about code quality and tests. If you've built something people actually use, this role is built for depth.
Apply through CareerJumpShip with your resume, GitHub profile, and a note about a product you've shipped. We're in New York City—this is an on-site role.
About this role
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