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.
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Tab (W15) Revolutionising the way travellers discover, plan and book a trip(about 2 months ago)
Product Engineer

fulltimeLondon, UKFull stack

OneSignal (S11) Engage customers through personalized omni-channel messaging(about 1 month ago)
Staff Software Engineer, SMS Team (Fullstack)

fulltimeUnited States (Remote) / Remote (US)Full stack

OneSignal (S11) Engage customers through personalized omni-channel messaging(4 months ago)
Senior Software Engineer, Journeys Team (Backend)

fulltimeUnited States (Remote) / Remote (US)Full stack

HackerRank (S11) Change the world to value skills over pedigree
HackerRank (YC S11) is Hiring a Senior Software Engineer

fulltimeSanta Clara, CA, USBackend

HackerRank (S11) Change the world to value skills over pedigree
HackerRank (YC S11) is Hiring an Engineering Manager

fulltimeSanta Clara, CA, USEngineering manager

PicnicHealth (S14) Empowering Patients for Deep Real World Data
AI Tools Engineer

fulltimeSan Francisco, Remote / Remote (US)Full stack

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

fulltimeLondon, England, GBBackend

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

fulltimeBR / Remote (BR)Backend

Vulcan Technologies (S25) AI regulatory drafting and compliance(about 4 hours ago)
Founding Engineer

fulltimeAustin, TX, USFull stack

Albacore Inc. (S25) Autonomous undersea vehicles to deter maritime invasions.
Mechanical Engineer

fulltimePhiladelphia, PA, USMechanical

Albacore Inc. (S25) Autonomous undersea vehicles to deter maritime invasions.
Software Engineer

fulltimePhiladelphia, PA, USFull stack

StarSling (X25) Cursor for DevOps(11 days ago)
Founding Software Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

StarSling (X25) Cursor for DevOps
Software Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

Eloquent AI (X25) The AI Operator for Financial Services
AI Engineer, Multimodal LLMs

fulltimeSan FranciscoFull stack

Eloquent AI (X25) The AI Operator for Financial Services
AI Engineer, Agent

fulltimeSan FranciscoFull stack

MorphoAI (X25) Software tool for designing robots and machines (3 months 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

Artifact (W25) An Collaborative, AI-native IDE for Hardware Engineers(4 months ago)
Software Engineer

fulltimeNew York, NY, USFull stack

Artifact (W25) An Collaborative, AI-native IDE for Hardware Engineers(4 months ago)
Forward-Deployed Software Engineer

fulltimeNew York, NY, USFull stack

Ergo (W25) AI Agents for Sales Operations
Software Engineer - Fullstack

fulltimeSan Francisco, CA, USFull stack

Ergo (W25) AI Agents for Sales Operations
Software Engineer - Backend

fulltimeSan Francisco, CA, USBackend

Harper (W25) AI-native commercial insurance brokerage
AI Platform Engineer - Member of Technical Staff

fulltimeSan Francisco, CA, USMachine learning

Harper (W25) AI-native commercial insurance brokerage
Head of Voice AI

fulltimeSan Francisco, CA, USFull stack

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

Cuckoo Labs (W25) Real-time AI translator for global sales and marketing
Full Stack Engineering Internship (Summer 2026)

internSan Francisco, CA, US / Seoul, KRFull stack

SalesPatriot (W25) We help defense firms win more contracts with the Pentagon(4 months ago)
Forward Deployed Software Engineer

fulltimeSan FranciscoFull stack

SalesPatriot (W25) We help defense firms win more contracts with the Pentagon
AI Infrastructure Engineer

fulltimeSan Francisco, CA, USFull stack

Bild AI (W25) AI that understands construction blueprints(19 days ago)
Founding Engineer (Applied AI)

fulltimeSan Francisco, CA, USMachine learning


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