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 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

Wefunder (W13) We're Robinhood for pre-IPO startups. Everyone can invest $100.(11 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
Computer Vision Engineer

fulltimeUK / Remote (US)Full stack

Amplitude (W12) Digital Analytics Platform(1 day ago)
Full-stack AI Engineer II, Assistant

fulltimeSan Francisco, CA, USFull stack

Amplitude (W12) Digital Analytics Platform(16 days ago)
Senior Product Engineer, AI Agents

fulltimeSan Francisco, CA, USFull stack

RealRoots (S25) AI social app for female transplants(24 days ago)
Software Engineer, Full-Stack

fulltimeSan Francisco, CA, USFull stack

burnt (S25) Agentic Operating System for Food Supply Chain(3 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

TectoAI (S25) Recruit and Monitor AI Employees(2 days ago)
Founding Engineer (ML + Full-Stack)

fulltimeSan Francisco, CA, USFull stack

Humoniq (S25) AI-Native BPO for travel & transport
Senior Backend Engineer (GDS Experience Required)

fulltimeBoulder, CO, US / Mission Viejo, CA, US / New York, NY, US / Remote (US)Backend

Floot (S25) The easiest way for non-coders to build apps with AI.(4 days ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

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

fulltimeSan Francisco, CA, USEmbedded systems

Embedder (S25) Coding Agent for Firmware
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

AgentHub (S25) The simulation and evaluation engine for AI agents(7 days ago)
Research Engineer Intern

internSan Francisco, CA, USMachine learning

AgentHub (S25) The simulation and evaluation engine for AI agents
Founding Research Engineer

fulltimeSan Francisco, CA, USMachine learning

Herdora (S25) Fast AI Inference(about 22 hours ago)
Member Of Technical Staff (Winter Intern)

internSan Francisco, CA, USMachine learning

Herdora (S25) Fast AI Inference(about 5 hours ago)
Member of Technical Staff

fulltimeSan Francisco, CA, USMachine learning

truthsystems (S25) Automatically blocking risky behavior with real-time governance agents(about 13 hours ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, 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

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

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

fulltimeIN / Remote (IN)Backend

Tegore (X25) conversational & personalized AI teacher to help with K-12 learning(1 day ago)
Full Stack Developer Intern

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

Bloom (X25) Build and share mobile apps in seconds(4 days ago)
Founding Engineer

fulltimeZürich, ZH, CH / RemoteFull stack

Bloom (X25) Build and share mobile apps in seconds(about 9 hours ago)
AI / Full-Stack Student Internship (Winter or Summer 2026)

internZürich, ZH, CH / Remote (US)Full stack


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