Castle
Hiring
What they do:
Block bots & bad behavior
Quick facts:
HQ: San Francisco, CA, United States
Top Developer Tools Startups
This list has 794 startups and was last updated on Oct 15, 2026. 187 of them are hiring right now. Biggest hubs: San Francisco (441), New York (75), and London (39). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Coding Giants raised €6M (Oct 14, 2026).
Survival statistics →886 open roles →
794 startupsPage 4 of 23
Handoff
Hiring
What they do:
AI estimator & agent for remodelers.
Quick facts:
HQ: Austin, TX, United States
What they do:
Subscription infrastructure & paywall experimentation for mobile apps
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HQ: New York, NY, United States
Serif Health
Hiring
What they do:
Healthcare Price Transparency APIs and Data Products
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HQ: Los Angeles, CA, United States
Replo
Hiring
What they do:
Sell anything
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HQ: San Francisco, CA, United States
What they do:
We make Orca, MIT open source terminal-based agent orchestrator
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HQ: San Francisco, CA, United States
What they do:
Stripe-like API Docs in just a few clicks
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HQ: Tbilisi, Georgia
Medplum
Hiring
What they do:
API first electronic health record (EHR) that is open source
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HQ: San Francisco, CA, United States
Axle
Hiring
What they do:
AI-native clearinghouse for insurance
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HQ: New York, NY, United States
What they do:
The #1 Actionable FinOps Platform
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What they do:
Production-ready document processing
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HQ: New York, NY, United States
LiteLLM
Hiring
What they do:
Call every LLM API like it's OpenAI [100+ LLMs]
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HQ: San Francisco, CA, United States
Artie
Hiring
What they do:
Software that streams data from databases to warehouses in real-time
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HQ: San Francisco, CA, United States
What they do:
Frontier coding data for training and evaluating LLMs
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HQ: San Francisco, CA, United States
Junction
Hiring
What they do:
API for at-home health data
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HQ: London, United Kingdom
What they do:
The open source AI coding agent
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What they do:
The fastest way to ship airtight AI
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HQ: San Francisco, CA, United States
Porter
Hiring
What they do:
Easiest way to deploy on AWS/GCP/Azure
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HQ: New York, NY, 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:
Software delivery built for machine scale.
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HQ: Remote
Terminal
Hiring
What they do:
Plaid for Telematics Data in Commercial Trucking
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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
What they do:
Social Infrastructure for Games; Makers of Nakama game server, Satori…
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HQ: London, United Kingdom
Oway
Hiring
What they do:
Building the open operating system for the automated physical economy.
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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
What they do:
Anima - Design Agent | AgentGrid.io - Shared drive for humans & agents
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What they do:
Design system platform joins developers and designers together
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HQ: Prague, Czechia
BuildBuddy
Hiring
What they do:
BuildBuddy provides enterprise features for Bazel — the open source…
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HQ: San Francisco, CA, United States
What they do:
Self-Service Data Prep and Blend Built for Data Teams.
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HQ: Kraków, Poland
Meticulous
Hiring
What they do:
Automated e2e screenshot testing without writing or maintaining tests
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HQ: London, United Kingdom
Noloco
Hiring
What they do:
Flexible Business Apps for Modern Teams
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HQ: Dublin, Ireland
Velt
Hiring
What they do:
SDK for adding an agent and human governance layer to your product
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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
What they do:
The open-source document editor for humans and AI agents.
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