Sweep
Hiring
What they do:
The best AI coding assistant for JetBrains
Quick facts:
HQ: San Francisco, CA, United States
Top Developer Tools Startups in California
This list has 465 startups and was last updated on Oct 15, 2026. 133 of them are hiring right now. Biggest hubs: San Francisco (441) and Los Angeles (20). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Supabase raised $150M (Oct 2, 2026).
465 startupsPage 5 of 13
Cloudglue
Hiring
What they do:
The video context layer for AI.
Quick facts:
HQ: San Francisco, CA, United States
Onlook
Hiring
What they do:
The Developer tool for Designers
Quick facts:
HQ: San Francisco, CA, United States
Freebuff
Hiring
What they do:
The free coding agent
Quick facts:
HQ: San Francisco, CA, United States
Infinite
Hiring
What they do:
Global B2B Stablecoin Processor
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Stablecoin API for global payments
Quick facts:
HQ: San Francisco, CA, United States
TraceRoot.AI
Hiring
What they do:
Open Source AI Agent Improvement Platform
Quick facts:
HQ: San Francisco, CA, United States
Floot
Hiring
What they do:
The app platform inside Claude and ChatGPT.
Quick facts:
HQ: San Francisco, CA, United States
Superset
Hiring
What they do:
Building self-improving software
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Scalable validation infrastructure for AI agents
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HQ: San Francisco, CA, United States
What they do:
No-code business app builder
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HQ: San Francisco, CA, United States
MSPilot
Hiring
What they do:
Turn AI adoption into a recurring revenue line.
Quick facts:
HQ: San Francisco, CA, United States
Poly
Hiring
What they do:
Intelligent Personal Cloud Storage
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HQ: San Francisco, CA, United States
Firecrawl
Hiring
What they do:
Building the library for superintelligence.
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Secure multiplayer workspace for teams building with agents
Quick facts:
HQ: San Francisco, CA, United States
cmux
Hiring
What they do:
Open source applied AI lab building next-gen devtools
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HQ: San Francisco, CA, United States
a0.dev
Hiring
What they do:
We make mobile apps using AI.
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HQ: San Francisco, CA, United States
Cua
Hiring
What they do:
Give every agent a cloud desktop
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HQ: San Francisco, CA, United States
Attune
Hiring
What they do:
Faster builds, zero effort.
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HQ: San Francisco, CA, United States
What they do:
Training gyms for computer use and software engineering work
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HQ: San Francisco, CA, United States
What they do:
Automation Foundation Models For Tiny Devices
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HQ: San Francisco, CA, United States
Nozomio
Hiring
What they do:
product lab. focused on personal ai and context.
Quick facts:
HQ: San Francisco, CA, United States
Sourcebot
Hiring
What they do:
Helping humans and AI agents understand massive codebases
Quick facts:
HQ: San Francisco, CA, United States
What they do:
AI engineer that debugs and fixes production incidents in realtime
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Empowering anyone to build cellular network
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HQ: San Francisco, CA, United States
Rulebricks
Hiring
What they do:
Add powerful decision-making capabilities to any automated workflow.
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HQ: San Francisco, CA, United States
Cerulion
Hiring
What they do:
Open source operating system for robots
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HQ: San Francisco, CA, United States
HumanLayer
Hiring
What they do:
The multiplayer control plane for your software factory
Quick facts:
HQ: San Francisco, CA, United States
Humwork
Hiring
What they do:
Human experts as API for AI Agents
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HQ: San Francisco, CA, United States
Unsiloed AI
Hiring
What they do:
API for parsing multimodal unstructured data
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HQ: San Francisco, CA, United States
Lemma
Hiring
What they do:
Production Monitoring for AI agents
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HQ: San Francisco, CA, United States
Waddle Labs
Hiring
What they do:
LLMs that control robots
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HQ: San Francisco, CA, United States
Salus
Hiring
What they do:
Guardrails to validate your agent's actions before they execute
Quick facts:
HQ: San Francisco, CA, United States
Replicas
Hiring
What they do:
Run any coding agent harness in the cloud
Quick facts:
HQ: San Francisco, CA, United States
Reason Machines
Hiring
What they do:
Reason Machines builds Reason Agent, the autonomous software engineer…
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HQ: San Francisco, CA, United States
Workers IO
Hiring
What they do:
Simulation Environments for Verifying Mission Critical Software
Quick facts:
HQ: San Francisco, CA, United States