Software Engineer jobs at Y Combinator startups

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Mashgin (W15) Self-Checkout using Computer Vision.
Senior Software Engineer, Full-Stack

fulltimePalo Alto, CAFull stack

Mashgin (W15) Self-Checkout using Computer Vision.
Senior Software Engineer, Backend

fulltimePalo Alto, CABackend

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

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

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

Webflow (S13) Professional website design and publishing platform.
Senior Software Engineer

fulltimeSan Francisco, CA or Remote (US Only) / RemoteBackend

Webflow (S13) Professional website design and publishing platform.
Senior Software Engineer

fulltimeSan francisco, CA / RemoteFull stack

Vulcan Technologies (S25) AI regulatory drafting and compliance(6 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(about 2 hours ago)
Founding Engineer

fulltimeNew York, NY, USBackend

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

fulltimeSan Francisco, CA, USFull stack

StarSling (X25) Cursor for DevOps(21 days ago)
Founding 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
Software Engineer, Full-Stack

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. (about 1 hour ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

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

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

Crimson (X25) The AI Associate for Litigation Lawyers(1 day 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
AI Platform Engineer

fulltimeSan Francisco, CA, USMachine learning

Harper (W25) AI-native commercial insurance brokerage(16 days ago)
AI Forward Deployed Engineer

fulltimeSan Francisco, CA, USMachine learning

Waypoint Transit (W25) We automate urban planning so cities can build cheaper and faster.(15 days ago)
Founding Software Engineer

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


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