Software Engineer jobs at Y Combinator startups

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PicnicHealth (S14) Empowering Patients for Deep Real World Data(about 22 hours ago)
Product Engineer

fulltimeSan Francisco, Remote / Remote (US)Full stack

Webflow (S13) Professional website design and publishing platform.
Quality Assurance Manager

fulltimeSan francisco, CA or Remote (US Only) / Remote (US)Engineering manager

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

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

CircuitHub (W12) On-Demand Electronics Manufacturing(2 months ago)
Operations Research Engineer

fulltimeUK / Remote (US)Full stack

CircuitHub (W12) On-Demand Electronics Manufacturing(5 months ago)
Full-Stack Robotics Engineer

fulltimeDeerfield, MA, US / Remote (US)Full stack

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

fulltimeSan Francisco, CA, USFull stack

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

fulltimeSan Francisco, CA, USFull stack

DiligenceSquared (F25) AI-powered market due diligence for investment decisions(2 days ago)
Founding Engineer - Fullstack

fulltimeNew York, NY, USFrontend

DiligenceSquared (F25) AI-powered market due diligence for investment decisions
Founding Engineer - Frontend

fulltimeNew York, NY, USFrontend

HireGlide (F25) AI screening and matching for hiring teams
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

Selfin (F25) Building the first AI Bank(about 16 hours ago)
Software Founding Engineer

fulltimeSan Francisco, CA, US / London, England, GBMachine learning

Structured AI (F25) AI workforce for Construction Engineering
Founding Engineer

fulltimeNew York, NY, USFull stack

Fleetline (S25) Optimizing fleet planning with data driven algorithms
Founding Engineer

fulltimeNew York, NY, 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.(16 days ago)
Founding Full-Stack Engineer

fulltimeSan Francisco, CA, USFull stack

Relling (S25) Data and infra for world models(1 day ago)
Founding Engineer

fulltimeSan Francisco, CA, USFull stack

mcp-use (S25) Open-source dev tools and infrastructure for MCP.(6 days ago)
Founding Engineer

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

BootLoop (S25) Firmware in minutes, not months - rigorously tested on real hardware
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

AgentMail (S25) Email Inboxes for AI Agents(5 days ago)
Founding Engineer

fulltimeSan Francisco, CA, USBackend

Besimple AI (X25) Voice data for AI
Founding Engineer (Full-Stack)

fulltimeRedwood City, CA, USFull stack

Besimple AI (X25) Voice data for AI(8 days ago)
Product Engineering Intern - Remote Part Time

internUS / Remote (US)Full stack

Novoflow (X25) AI employees that automate medical operations for clinics. (about 2 months ago)
Founding Software Engineer

fulltimeSan Francisco, CA, USFull stack

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

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

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

fulltimeSan Francisco, CA, USDevops

Sixtyfour (X25) AI Agents for Research
Full-Stack Software Engineering Intern (Winter 2026)

internSan Francisco, CA, USFull stack

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

fulltimeNew York, NY, USFull stack

cubic (X25) AI-powered code review platform(13 days ago)
Founding Product Engineer @ cubic (YC X25)

fulltimeLondon, England, GBFull stack


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