Software Engineer jobs at Y Combinator startups

Find open roles and connect with founders and hiring teams of over 1,000 vetted, funded Y Combinator startups. And create one application to apply to hundreds of roles at YC companies.
Create Profile ›
EngineeringDesignRecruitingScienceProductOperationsSalesMarketingLegalFinance
SnapMagic (S15) AI copilot for electronics design(22 days ago)
Director of Software & Product

fulltimeRedwood City, CA, US / Remote (Redwood City, CA, US)Engineering manager

Pax Historia (W26) The first AI-powered grand strategy platform
Founding Engineer (AI / ML)

fulltimeSan FranciscoFull stack

Pax Historia (W26) The first AI-powered grand strategy platform
Founding Engineer (Full Stack Web)

fulltimeSan Francisco, CA, USFull stack

Leadbay (F25) Discover and qualify SMB leads that couldn't be found before.
Backend Engineer

fulltimeParis, IDF, FR / Paris, Île-de-France, FR / San Francisco, CA, USBackend

Leadbay (F25) Discover and qualify SMB leads that couldn't be found before.(28 days ago)
Engineering Intern

internParis, IDF, FR / Paris, Île-de-France, FR / San Francisco, CA, USFull stack

Unsiloed AI (F25) API for parsing multimodal unstructured data(23 days ago)
Founding Software Engineer - Backend and Infrastructure

fulltimeSan Francisco, CA, USBackend

Unsiloed AI (F25) API for parsing multimodal unstructured data
Founding ML Researcher

fulltimeSan Francisco, CA, USMachine learning

SF Tensor (F25) Infrastructure for AI labs to focus on research.(about 17 hours ago)
Founding GPU Compiler Engineer

fulltimeSan FranciscoFull stack

SF Tensor (F25) Infrastructure for AI labs to focus on research.
Founding Research Engineer, AI-Driven Compilation

fulltimeSan FranciscoFull stack

Flick (F25) Figma + Cursor, for AI Filmmaking(19 days ago)
Founding Frontend Engineer

fulltimeSunnyvale, CA, US / RemoteFrontend

Hypercubic (F25) AI to maintain and modernize COBOL.
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

Brickwise (F25) AI property manager for landlords and estate agents(13 days ago)
Software Engineer (Full Stack)

fulltimeLondon, England, GBFull stack

Structured AI (F25) AI workforce for Construction Engineering(about 11 hours ago)
Founding Engineer

fulltimeNew York, NY, USFull stack

Uplane (F25) Replace marketing agencies with AI(14 days ago)
Founding Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

Uplane (F25) Replace marketing agencies with AI(4 days ago)
Founding AI Engineer

fulltimeSan Francisco, CA, USData science

Fleetline (S25) Optimizing fleet planning with data driven algorithms(about 2 months ago)
Founding Algorithm Developer

fulltimeNew York, NY, USData science

Fleetline (S25) Optimizing fleet planning with data driven algorithms
Founding Engineer

fulltimeNew York, NY, USFull stack

Floot (S25) The easiest way for non-coders to build apps with AI.(about 2 hours ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

Minimal AI (S25) AI Agents for E-commerce Customer Support(11 days ago)
Full-Stack Developer (NYC)

fulltimeNew York, NY, USFull stack

Minimal AI (S25) AI Agents for E-commerce Customer Support(11 days ago)
Founding Engineer: Product-Focused Full-Stack Developer (NYC)

fulltimeNew York, NY, USFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(8 days ago)
Software Engineer (Founding Team)

fulltimeZürich, ZH, CH / Zürich, Zurich, CH / San Francisco, CA, USFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(10 days ago)
Open Source Engineer (DevRel / Community)

fulltimeSan Francisco, CA, US / Zürich, Zurich, CHBackend

Channel3 (S25) Database of every product on the internet(2 days ago)
Fullstack Engineer

fulltimeNew York, NY, USFull stack

Channel3 (S25) Database of every product on the internet
Backend Engineer

fulltimeNew York, NY, USBackend

BootLoop (S25) Firmware in minutes, not months - rigorously tested on real hardware(24 days ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

truthsystems (S25) Automatically blocking risky behavior with real-time governance agents(about 2 months ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

AgentMail (S25) Email Inboxes for AI Agents(about 2 months ago)
Founding Engineer

fulltimeSan Francisco, CA, USBackend

Parametric (F25) Robots for frontline physical labor — starting with laundry
Machine Learning Research Engineer

fulltimeSan Francisco, CA, USMachine learning

Parametric (F25) Robots for frontline physical labor — starting with laundry(7 days ago)
Software Engineer, Data Engine

fulltimeSan Francisco, CA, USData science

Delty (X25) Transforming healthcare operations with AI agents(25 days ago)
Full stack software engineer

contractSan Francisco, CA, US / RemoteFull stack


Sign up to see more ›