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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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

OneSignal (S11) Engage customers through personalized omni-channel messaging(about 2 months ago)
Staff Software Engineer, SMS Team (Fullstack)

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 Fullstack

fulltimeBengaluru, KA, IN / Bengaluru, Karnataka, INFrontend

HackerRank (S11) Change the world to value skills over pedigree
Web Design Engineer

fulltimeHybrid in Santa Clara, CAFull stack

Tenjin (S14) Mobile marketing analytics and infrastructure
Senior Full-Stack Ruby on Rails Engineer

fulltimeUS / CA / MX / BR / AR / CO / PE / Remote (US; CA; MX; BR; AR; CO; PE)Full stack

Tenjin (S14) Mobile marketing analytics and infrastructure
Senior Mobile SDK Engineer

fulltimeSan Francisco / Remote (US; CA; MX; CO; AR; BR; PE)Full stack

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

fulltimeSan Francisco, Remote / Remote (US)Full stack

Vulcan Technologies (S25) AI regulatory drafting and compliance(5 days 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.
Electrical Engineer

fulltimePhiladelphia, PA, USElectrical

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

fulltimeNew York, NY, USBackend

StarSling (X25) Cursor for DevOps(20 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, .＊RAG

fulltimeSan FranciscoFull stack

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

fulltimeSan FranciscoFull stack

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

fulltimeIN / Remote (IN)Backend

Novoflow (X25) AI employees that automate medical operations for clinics.
Founding Forward Deployed Engineer

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

Novoflow (X25) AI employees that automate medical operations for clinics. (2 days ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

Crimson (X25) The AI Associate for Litigation Lawyers(about 10 hours ago)
Founding Engineer (Full Stack)

fulltimeLondon, England, GBFull stack

YouLearn (X25) AI tutor for each student.
Founding Engineer (Full Stack)

fulltimeSan Francisco, CA, USFull stack

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)
Senior Software Engineer

fulltimeNew York, NY, USFull stack

Harper (W25) AI-native commercial insurance brokerage(16 days ago)
Machine Learning / Data Scientist - Member of Technical Staff

fulltimeSan Francisco, CA, USData science

Harper (W25) AI-native commercial insurance brokerage
AI Engineer - Voice

fulltimeSan Francisco, CA, USFull stack

Waypoint Transit (W25) We automate urban planning so cities can build cheaper and faster.
Software Engineering Intern (Summer 2026)

internSan Francisco, CA, USFull stack

Waypoint Transit (W25) We automate urban planning so cities can build cheaper and faster.(14 days ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

Bindwell (W25) Discovering new pesticides with AI
Founding Machine Learning Engineer

fulltimeSan Francisco, CA, USMachine learning

Bindwell (W25) Discovering new pesticides with AI(2 months ago)
Machine Learning Intern (Summer 2026)

internSan Francisco, CA, USMachine learning

Olive (W25) Build internal tools with a prompt.
Founding Software Engineer

fulltimeSan Francisco, CAFull stack

Olive (W25) Build internal tools with a prompt.
Software Engineering Intern

fulltimeSan Francisco, CA / Remote (US)Full stack


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