Software Engineer jobs at Y Combinator startups

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

fulltimePalo Alto, CABackend

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

fulltimePalo Alto, CAFull stack

OneSignal (S11) Engage customers through personalized omni-channel messaging(7 months ago)
Senior Software Engineer, Journeys Team (Fullstack)

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

OneSignal (S11) Engage customers through personalized omni-channel messaging(4 months ago)
Staff Software Engineer, SMS Team (Fullstack)

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

Hive (S14) Marketing automation for event promoters (email, sms, ads, CRM)
Senior Product Engineer, Agentic AI

fulltimeCanada (Remote) / Remote (CA)Full stack

Hive (S14) Marketing automation for event promoters (email, sms, ads, CRM)
Staff Software Engineer, Data Systems

fulltimeCanada (Remote) / Remote (CA)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

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

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

Amplitude (W12) Digital Analytics Platform(about 2 months ago)
Senior Product Engineer, AI Agents

fulltimeSan Francisco, CA, USFull stack

Amplitude (W12) Digital Analytics Platform
Staff Product Engineer, AI Agents

fulltimeSan Francisco, CA, USFull stack

Avelis Health (S25) We audit medical claims for self-insured employers and health plans.(6 days ago)
Founding Engineer - Full Stack

fulltimeSan Francisco, CA, US / RemoteBackend

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

Idler (S25) Scale AI for reinforcement learning environments.
Senior Software Engineer

fulltimeSan FranciscoFull stack

Idler (S25) Scale AI for reinforcement learning environments.
Software Engineer

fulltimeSan FranciscoFull stack

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

Relling (S25) Data and infra for world models(7 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.
Founding Engineer

fulltimeZürich, ZH, CH / Zürich, Zurich, CH / San Francisco, CA, USFull stack

Pangolin (S25) Open-source alternative to Cloudflare Tunnels(15 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

EffiGov (S25) The AI OS for Cities
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

Blank Bio (S25) RNA-based AI for better drugs and smarter clinical trials.(about 1 month ago)
Machine Learning Research Scientist

fulltimeSan Francisco, CA, USMachine learning

Blank Bio (S25) RNA-based AI for better drugs and smarter clinical trials.(about 1 month ago)
Machine Learning Engineer

fulltimeSan Francisco, CA, USMachine learning

AgentMail (S25) Email Inboxes for AI Agents(6 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USBackend

Besimple AI (X25) Expert-in-the-loop eval data for AI(5 days ago)
Product Engineering Intern - Remote Part Time

internUS / Remote (US)Full stack

Besimple AI (X25) Expert-in-the-loop eval data for AI
Founding Engineer (Full-Stack)

fulltimeRedwood City, CA, USFull stack

Sixtyfour (X25) AI Agents for Research
Infrastructure Engineer — Systems & Platform

fulltimeSan Francisco, CA, USDevops

Sixtyfour (X25) AI Agents for Research
AI Engineer

fulltimeSan Francisco, CA, USFull stack

Claim Health (X25) The first AI revenue platform for post-acute healthcare
Full Stack Engineer

fulltimeNew York, NY, USFull stack

Avallon AI (X25) AI agents for insurance claims operations
Founding Software Engineer

fulltimeNew York, NY, USFull stack

Avallon AI (X25) AI agents for insurance claims operations
Founding Forward Deployed Engineer

fulltimeNew York, NY, USFull stack

Bloom (X25) Build and share mobile apps in seconds(5 days ago)
Founding Engineer

fulltimeZürich, ZH, CH / RemoteFull stack


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