Software Engineer jobs at Y Combinator startups

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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 1 month 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 an Engineering Manager

fulltimeSanta Clara, CA, USEngineering manager

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

fulltimeSanta Clara, CA, USBackend

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(about 21 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
Software Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

StarSling (X25) Cursor for DevOps(13 days ago)
Founding Software Engineer (Full-Stack)

fulltimeSan Francisco, CA, USFull stack

Eloquent AI (X25) The AI Operator for Financial Services
AI Engineer, AIOps & Infrastructure

fulltimeSan FranciscoFull stack

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

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
Senior Software Engineer (Backend)

fulltimeIN / Remote (IN)Backend

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

fulltimeIN / Remote (IN)Frontend

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. (about 13 hours ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

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

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

fulltimeSan Francisco, CA, USBackend

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

fulltimeSan Francisco, CA, USFull stack

Harper (W25) AI-native commercial insurance brokerage(7 days ago)
AI Forward Deployed 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 days ago)
Backend/Fullstack Software Engineer

fulltimeSan Francisco, CA, USFull stack

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

fulltimeSan FranciscoFull stack


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