Software Engineer jobs at Y Combinator startups

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SnapMagic (S15) AI copilot for electronics design(4 days ago)
Director of Software & Product

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

PicnicHealth (S14) Empowering Patients for Deep Real World Data(9 days ago)
Product Engineer

fulltimeSan Francisco, Remote / Remote (US)Full stack

CircuitHub (W12) On-Demand Electronics Manufacturing
Full-Stack Robotics Engineer Summer 2026 Intern

fulltimeSouth Deerfield, MassachusettsFull stack

CircuitHub (W12) On-Demand Electronics Manufacturing
Haskell Engineer

fulltimeUK / Remote (US)Full stack

Amplitude (W12) Digital Analytics Platform(about 2 months ago)
Full-stack AI Engineer II, Assistant

fulltimeSan Francisco, CA, USFull stack

Amplitude (W12) Digital Analytics Platform
Staff Product Engineer, AI Agents

fulltimeSan Francisco, CA, USFull stack

DiligenceSquared (F25) AI-powered market due diligence for investment decisions
Founding Engineer - Frontend

fulltimeNew York, NY, USFrontend

DiligenceSquared (F25) AI-powered market due diligence for investment decisions(13 days ago)
Founding Engineer - Backend

fulltimeNew York, NY, USFrontend

Miniswap (F25) The Marketplace for Complex Hobbies(5 days ago)
Founding Engineer

fulltimeSan Francisco, CA, US / Remote (San Francisco, CA, US)Full stack

Karumi (F25) The Waymo of Personalized demos(about 12 hours ago)
AI/ML Applied Engineer

fulltimeNew York, NY, US / San Francisco, CA, USMachine learning

Karumi (F25) The Waymo of Personalized demos(10 days ago)
Product Engineer (Full-Stack)

fulltimeSan Francisco, CA, US / New York, NY, USFull stack

HireGlide (F25) AI screening and matching for hiring teams
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

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

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

Structured AI (F25) AI workforce for Construction Engineering
Founding Engineer

fulltimeNew York, NY, USFull stack

Idler (S25) Reinforcement learning environments.
Senior Software Engineer

fulltimeSan FranciscoFull stack

Idler (S25) Reinforcement learning environments.
Software Engineer

fulltimeSan FranciscoFull stack

Floot (S25) The easiest way for non-coders to build apps with AI.(27 days ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

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

fulltimeNew York, NY, USFull stack

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

fulltimeNew York, NY, USFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(7 days ago)
Founding Engineer

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

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

fulltimeSan Francisco, CA, USFull stack

AgentMail (S25) Email Inboxes for AI Agents(16 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USBackend

Delty (X25) Transforming healthcare operations with AI agents
Machine Learning Engineer

contractSan Francisco, CA, US / RemoteMachine learning

Delty (X25) Transforming healthcare operations with AI agents(about 1 hour ago)
Full stack software engineer

contractSan Francisco, CA, US / RemoteFull stack

Sixtyfour (X25) AI Agents for Research
Infrastructure Engineer — Systems & Platform

fulltimeSan Francisco, CA, USDevops

Sixtyfour (X25) AI Agents for Research(7 days ago)
Software Engineer - Full-Stack

fulltimeSan Francisco, CA, US / Remote (US; CA)Full stack

Avallon AI (X25) AI agents for insurance claims operations
Founding Forward Deployed Engineer

fulltimeNew York, NY, USFull stack

Chestnut (X25) The first AI mortgage lender
Software Engineer

fulltimeSan Francisco, CAFull stack


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