Software Engineer jobs at Y Combinator startups

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OneSignal (S11) Engage customers through personalized omni-channel messaging(5 months ago)
Senior Software Engineer, Journeys Team (Fullstack)

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

OneSignal (S11) Engage customers through personalized omni-channel messaging(3 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 Software Development Engineer

fulltimeSanta Clara, CA, USBackend

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

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

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

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

fulltimeSan Francisco, Remote / Remote (US)Full stack

Wefunder (W13) We're Robinhood for pre-IPO startups. Everyone can invest $100.(2 days ago)
Full Stack, Senior Software Engineer

fulltimeSan Francisco, CA, USFull stack

CircuitHub (W12) On-Demand Electronics Manufacturing
Haskell Engineer

fulltimeUK / Remote (US)Full stack

CircuitHub (W12) On-Demand Electronics Manufacturing
Full-Stack Robotics Engineer Summer 2026 Intern

fulltimeSouth Deerfield, MassachusettsFull stack

Amplitude (W12) Digital Analytics Platform
AI Product Engineer II, Assistant

fulltimeSan Francisco, CA, USFull stack

Amplitude (W12) Digital Analytics Platform(7 days ago)
Senior Product Engineer, AI Agents

fulltimeSan Francisco, CA, USFull stack

RealRoots (S25) AI social app for female transplants(15 days ago)
Software Engineer, Full-Stack

fulltimeSan Francisco, CA, USFull stack

burnt (S25) Agentic Operating System for Food Supply Chain(5 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

Magnetic (S25) AI Tax Preparer for CPA firms
Founding Engineer (Applied AI)

fulltimeSan Francisco, CA, USFull stack

Humoniq (S25) AI-Native BPO for travel & transport(10 days ago)
Senior AI Engineer

fulltimeMission Viejo, CA, USData science

Floot (S25) The easiest way for non-coders to build apps with AI.(1 day ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

Socratix AI (S25) AI coworkers for fraud and risk teams.
Founding Backend Engineer

fulltimeMenlo Park, CA, US / Mountain View, CA, US / San Mateo, CA, USBackend

Embedder (S25) Coding Agent for Firmware
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

Embedder (S25) Coding Agent for Firmware
Founding Embedded Software Engineer

fulltimeSan Francisco, CA, USEmbedded systems

truthsystems (S25) Automatically blocking risky behavior with real-time governance agents(2 days ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

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

fulltimeSan Francisco, CA, US / San Mateo, CA, US / Palo Alto, CA, US / Menlo Park, CA, US / Redwood City, CA, USFull stack

StarSling (X25) Cursor for DevOps(about 2 months ago)
Founding Software Engineer (Full-Stack)

fulltimeSan Francisco, CA, US / San Mateo, CA, US / Palo Alto, CA, US / Menlo Park, CA, US / Redwood City, CA, USFull 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. (1 day ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

Crimson (X25) The AI Associate for Litigation Lawyers(3 days ago)
Founding Engineer (Full Stack)

fulltimeLondon, England, GBFull stack

Artifact (W25) An Collaborative, AI-native IDE for Hardware Engineers(5 months ago)
Senior Software Engineer

fulltimeNew York, NY, USFull stack

Artifact (W25) An Collaborative, AI-native IDE for Hardware Engineers(5 months ago)
Software Engineer

fulltimeNew York, NY, USFull stack


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