Y Combinator

Product Engineer, New Products

San Francisco Bay Area

Sponsorship not specified$185k-$485kDetected 29 days ago

TypeScriptReactRailsFull-Stack DevelopmentGitPostgreSQLLLMsAI OrchestrationCommunication

About the role

Some ship in the open to hundreds of thousands of developers (gstack, gbrain - already north of 130,000 GitHub stars between them).
You won't be maintaining someone else's roadmap.
You'll be taking new products from zero to one, owning them end-to-end, and putting them in front of real users fast.

Take new products from 0→1 - design, build, and ship full-stack systems and developer tools end-to-end
Build AI-native software: agent orchestration, semantic search, embeddings, knowledge graphs, LLM workflows
Own developer and user experience completely - 30-second installs, time-to-first-value measured in minutes, interfaces people actually want to use
Use your own fully AI-enabled dev stack and make pragmatic tradeoffs in a fast-moving environment
Are a strong full-stack, product-minded engineer who owns products, not just code - no PMs, no designers, you make the product and UX calls

Experience shipping full-stack or systems software end-to-end.
Strong product sense and comfort designing user experiences - Clear communication and the ability to work directly with non-technical stakeholders - High judgment and integrity

LLMs, prompt engineering, or agent-based systems
Open-source maintainership and community engagement
TypeScript, Postgres/pgvector, Rails, React (the stack our current products run on)
Retrieval, search, or knowledge-graph systems

Compensation: $185K–$485K base + profit-sharing (comparable to startup equity or VC carry)

Medical, dental, vision, 401(k) + 4% match, parental leave, flexible PTO, and more
$185K-$485K base + profit-sharing (comparable to startup equity or VC carry)

Live in an AI-native dev stack and have built AI-enabled products, agents, or prototypes
Care about developer experience and the craft of a tool people love
Like turning hard problems into clean, usable systems and shipping fast
Are low-ego, comfortable with ambiguity, and get along with everyone in our ~100-person company
Former founders and early-stage startup engineers
Prolific open-source contributors or maintainers
Product engineers who've built and shipped complete products end-to-end
Engineers who've owned both backend systems and frontend/user experience

Y Combinator is willing to sponsor certain employment visas in accordance with company policy.

This listing is sourced directly from Y Combinator's careers page and normalized into a canonical job model.