What they do:
Frontier coding data for training and evaluating LLMs
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 3 of 13
What they do:
The fastest way to ship airtight AI
Quick facts:
HQ: San Francisco, CA, United States
Inkeep
Hiring
What they do:
Build AI Agent teammates and automations in code or no-code
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HQ: San Francisco, CA, United States
What they do:
Develop your CI/CD pipelines as code and run them anywhere
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HQ: San Francisco, CA, United States
What they do:
Crazy fast, open source infra for AI agents to use the Internet
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HQ: San Francisco, CA, United States
Oway
Hiring
What they do:
Building the open operating system for the automated physical economy.
Quick facts:
HQ: San Francisco, CA, United States
Revyl
Hiring
What they do:
The Mobile Development Platform
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HQ: San Francisco, CA, United States
Activeloop
Hiring
What they do:
Database for AI
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HQ: San Francisco, CA, United States
BuildBuddy
Hiring
What they do:
BuildBuddy provides enterprise features for Bazel — the open source…
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HQ: San Francisco, CA, United States
Velt
Hiring
What they do:
SDK for adding an agent and human governance layer to your product
Quick facts:
HQ: San Francisco, CA, United States
Omnistrate
Hiring
What they do:
Build your control plane to deploy your product in your customer VPC…
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HQ: San Francisco, CA, United States
Wordware
Hiring
What they do:
AI agents you can rely on
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HQ: San Francisco, CA, United States
Cekura
Hiring
What they do:
Voice AI and Chat AI agents: Testing and Observability
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HQ: San Francisco, CA, United States
What they do:
Pull Requests as a Service
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HQ: San Francisco, CA, United States
Ditto
Hiring
What they do:
Manage the words across your team’s product from design to production.
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HQ: San Francisco, CA, United States
Svix
Hiring
What they do:
Enterprise ready webhooks service, open-source and in the cloud
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HQ: San Francisco, CA, United States
Unsloth AI
Hiring
What they do:
Open-Source Reinforcement Learning (RL) & Fine-tuning for LLMs.
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HQ: San Francisco, CA, United States
Wasmer
Hiring
What they do:
The Operating System for Edge Computing
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HQ: San Francisco, CA, United States
Skyvern
Hiring
What they do:
Open Source AI Agent to automate browser workflows via an API
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HQ: San Francisco, CA, United States
ParadeDB
Hiring
What they do:
You should just use Postgres.
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HQ: San Francisco, CA, United States
SuperTokens
Hiring
What they do:
Open source alternative to Auth0 / AWS Cognito / Firebase Auth
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HQ: San Francisco, CA, United States
What they do:
AI SDET for mobile apps
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HQ: San Francisco, CA, United States
Dots 💸
Hiring
What they do:
Developer friendly drop in payouts infrastructure
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HQ: San Francisco, CA, United States
Reflex
Hiring
What they do:
The operating system for building mission-critical enterprise apps.
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HQ: San Francisco, CA, United States
Zep AI
Hiring
What they do:
The unified context layer for enterprise data
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HQ: San Francisco, CA, United States
Coval
Hiring
What they do:
Simulation & Evaluation that scales voice and chat AI agents
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HQ: San Francisco, CA, United States
Mem0
Hiring
What they do:
The Memory layer for AI Agents
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HQ: San Francisco, CA, United States
Thunder Compute
Hiring
What they do:
GPUs for Agents
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HQ: San Francisco, CA, United States
AgentMail
Hiring
What they do:
Email Inboxes for AI Agents
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HQ: San Francisco, CA, United States
What they do:
Meet Tara AI, your new engineering efficiency co-pilot.
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HQ: San Francisco, CA, United States
WarpBuild
Hiring
What they do:
Accelerate software development with WarpBuild's 10x faster CI infra.
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HQ: San Francisco, CA, United States
Silimate
Hiring
What they do:
Fast, efficient agents for chip design and debug
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HQ: San Francisco, CA, United States
Conductor
Hiring
What they do:
Run a team of coding agents on your Mac
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HQ: San Francisco, CA, United States
Dedalus Labs
Hiring
What they do:
Persistent computers for AI agents
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HQ: San Francisco, CA, United States
What they do:
API for healthcare compliance
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HQ: San Francisco, CA, United States
What they do:
The modern, open source, self-hosted AI customer support platform
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HQ: San Francisco, CA, United States