Software Engineer jobs at Y Combinator startups

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Qventus (W15) We automate operations for hospitals and health systems
Solutions Architect, Conversational AI & Prompt Engineering

fulltimeRemote, United States / Remote (US; CA)Full stack

Hive (S14) Marketing automation for event promoters (email, sms, ads, CRM)
Senior Backend Engineer

fulltimeCA / Remote (CA)Backend

Hive (S14) Marketing automation for event promoters (email, sms, ads, CRM)
Head of Engineering

fulltimeCanada (Remote) / Remote (CA; US)Full stack

DevCycle (W14) Feature Flag Management Built for Developers
Full-Stack Engineer

fulltimeToronto / Remote (CA)Full stack

Etleap (W13) Etleap is an ETL solution for creating perfect data pipelines.
Software Engineer - Integrations South America (remote)

fulltimeBR / Remote (BR)Backend

Etleap (W13) Etleap is an ETL solution for creating perfect data pipelines.
Senior Software Engineer

fulltimeLondon, England, GBBackend

MorphoAI (X25) Software tool for designing robots and machines (about 1 month ago)
Founding Engineer

fulltimeLondon, England, GBMachine learning

Third Chair (X25) Agents for in-house legal teams
Software Engineer (Frontend)

fulltimeIN / Remote (IN)Frontend

Third Chair (X25) Agents for in-house legal teams
Senior Software Engineer (Backend)

fulltimeIN / Remote (IN)Backend

Combinely (X25) AI coworker for accountants
Founding Engineer (Full-stack)

fulltimeSan Francisco, CA, USFull stack

Combinely (X25) AI coworker for accountants
Founding AI Engineer

fulltimeSan Francisco, CA, USFull stack

GroundControl (X25) Vertical AI for highly-regulated manufacturing(about 2 months ago)
Cloud Operations Engineer

fulltimeSan Francisco, CA, US / St. John's, Newfoundland and Labrador, CADevops

QFEX (X25) 24/7 Global Stock Exchange(2 days ago)
Founding Backend Engineer

fulltimeLondon, England, GBBackend

AfterQuery (W25) Research lab investigating the boundaries of AI capabilities.
ML Research Intern

internSan Francisco, CA, US / Remote (US; CA; GB)Machine learning

AfterQuery (W25) Research lab investigating the boundaries of AI capabilities.
Software Engineer Intern

internSan Francisco, CA, US / Remote (US)Frontend

Solidroad (W25) AI agents for sales and support teams, starting with training and QA.(4 days ago)
Software Engineer

fulltimeSan FranciscoFull stack

Solidroad (W25) AI agents for sales and support teams, starting with training and QA.(18 days ago)
Senior Product Engineer

fulltimeSan Francisco, CA, USFull stack

Bindwell (W25) Discovering new pesticides with AI(10 days ago)
Machine Learning Intern

internSan Francisco, CA, US / RemoteMachine learning

Olive (W25) Build internal tools for your data with natural language.
Software Engineering Intern

fulltimeSan Francisco, CA / Remote (US)Full stack

Olive (W25) Build internal tools for your data with natural language.
Founding Software Engineer

fulltimeSan Francisco, CAFull stack

ZeroEntropy (W25) High accuracy search API over unstructured data.
Founding Full Stack Engineer

fulltimeSan Francisco, CA, USFull stack

ZeroEntropy (W25) High accuracy search API over unstructured data.
Fall Intern (2025)

internSan Francisco, CA, USMachine learning

Keye (F24) The Smartest Private Equity Investor
Senior Software Engineer (Hybrid)

fulltimeNew York, NY, USFull stack

Keye (F24) The Smartest Private Equity Investor
Senior Frontend Engineer (Hybrid)

fulltimeNew York, NY, USFrontend

attimet (F24) we predict stuff(about 5 hours ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

telli (F24) AI phone agents that convert
Software Engineer

fulltimeBerlin / Remote (US)Full stack

telli (F24) AI phone agents that convert
Forward Deployed Engineer (AI)

fulltimeBerlinFull stack

Onlook (W25) Cursor for Designers(3 months ago)
Founding Engineer (Fullstack)

fulltimeSan Francisco, CA, USFull stack

Helium (S24) Self Improving Software
Founding Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

Helium (S24) Self Improving Software
Full-Stack Web Application Contractor

contractRemoteFull stack


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