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Y Combinator is hiring a full-stack product engineer to work at the center of how YC operates — from the application pipeline to events and internal tools. This role sits at the intersection of engineering, product, and operations. You’ll spend most of your time building production software for both internal teams and founders, while also helping design and improve the processes those tools support. At its core, this role is about turning operational complexity into well-designed software. We don’t have traditional PMs or designers. Engineers own the product experience end-to-end — from understanding the problem to designing the UI to shipping the system. The right person is excited to create their own interfaces, workflows, and user experiences, not just implement someone else’s specs.
Job Responsibility:
Design, build, and ship full-stack applications powering YC's admissions pipeline, events platform, and internal tools
Develop and extend YC's events platform (Demo Day, meetups, recruiting events, office hours, investor events), including registration, coordination, and media handling
Integrate with external systems (Google Calendar, Slack, email, data pipelines) to coordinate internal teams, external founders and more
Build deep AI and search systems (semantic search, embeddings, natural language queries) across large datasets
Make pragmatic engineering tradeoffs in a fast-moving environment
Build systems that automate YC's admissions workflow (scheduling, notifications, status tracking, email triage, deadlines)
Improve how applications are routed, interviews are coordinated, and information is surfaced to partners
Develop internal tools and copilots using LLMs (email classification, workflow automation, natural language interfaces)
Eliminate manual work so the team can focus on high-leverage decisions
Work directly with partners and ops teams to understand workflows and build better systems
Create dashboards and analytics to track pipeline health and operational metrics
Contribute to process improvements during admissions cycles
Requirements:
Experience shipping full-stack web applications
Strong system design and independent decision-making
Strong product sense and comfort designing user experiences
Ability to work directly with non-technical stakeholders
Clear communication skills
High judgment and integrity
Nice to have:
Experience with Rails, React, Postgres (or similar)