Software Engineer jobs at Y Combinator startups

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SnapMagic (S15) AI copilot for electronics design(16 days ago)
Director of Software & Product

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

Amplitude (W12) Digital Analytics Platform(3 months ago)
Full-stack AI Engineer II, Assistant

fulltimeSan Francisco, CA, USFull stack

Amplitude (W12) Digital Analytics Platform(26 days ago)
Senior AI Product Engineer

fulltimeSan Francisco, CAFull stack

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

fulltimeSan Francisco, CA, USFull stack

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

fulltimeSan FranciscoFull stack

Leadbay (F25) Discover and qualify SMB leads that couldn't be found before.(22 days ago)
Engineering Intern

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

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

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

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

fulltimeSan Francisco, CA, USMachine learning

Unsiloed AI (F25) API for parsing multimodal unstructured data(17 days ago)
Founding Software Engineer - Backend and Infrastructure

fulltimeSan Francisco, CA, USBackend

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

fulltimeSan FranciscoFull stack

SF Tensor (F25) Infrastructure for AI labs to focus on research.
Founding GPU Kernel Engineer

fulltimeSan FranciscoFull stack

Flick (F25) Figma + Cursor, for AI Filmmaking(13 days ago)
Founding Frontend Engineer

fulltimeSunnyvale, CA, US / RemoteFrontend

Sorce (F25) Tinder for jobs(5 days ago)
Founding Member of Technical Staff (AI Agents)

fulltimeSan Francisco, CA, USBackend

Brickwise (F25) AI property manager for landlords and estate agents(8 days ago)
Software Engineer (Full Stack)

fulltimeLondon, England, GBFull stack

Structured AI (F25) AI workforce for Construction Engineering(2 days ago)
Founding Engineer

fulltimeNew York, NY, USFull stack

Uplane (F25) Replace marketing agencies with AI(6 days ago)
Founding AI Engineer

fulltimeSan Francisco, CA, USData science

Uplane (F25) Replace marketing agencies with AI(9 days ago)
Founding Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

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

fulltimeNew York, NY, USFull stack

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

fulltimeNew York, NY, USData science

Humoniq (S25) AI-Native BPO for travel & transport
AI Engineer/s (Southern California)

fulltimeLadera Ranch, CA, US / Boulder, CO, US / New York, NY, USBackend

Idler (S25) Reinforcement learning environments.
Senior Software Engineer

fulltimeSan FranciscoFull stack

Idler (S25) Reinforcement learning environments.
Staff Software Engineer

fulltimeSan FranciscoFull stack

Floot (S25) The easiest way for non-coders to build apps with AI.(11 days ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

Minimal AI (S25) AI Agents for E-commerce Customer Support(13 days ago)
Founding Engineer: Product-Focused Full-Stack Developer (Amsterdam)

fulltimeAmsterdam, NH, NL / Amsterdam, North Holland, NLFull stack

Minimal AI (S25) AI Agents for E-commerce Customer Support(5 days ago)
Founding Engineer: Backend + AI-Focused Full-Stack Developer (Amsterdam)

fulltimeAmsterdam, NH, NL / Amsterdam, North Holland, NLFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(5 days ago)
Open Source Engineer (DevRel / Community Engineer)

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

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(5 days ago)
Infra God (Cloud / DevOps Engineer)

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

BootLoop (S25) Firmware in minutes, not months - rigorously tested on real hardware(18 days ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

truthsystems (S25) Automatically blocking risky behavior with real-time governance agents(about 1 month ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

AgentMail (S25) Email Inboxes for AI Agents(about 1 month ago)
Founding Engineer

fulltimeSan Francisco, CA, USBackend


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