Ellipsis
Hiring
What they do:
Cloud platform for coding agents
Quick facts:
HQ: New York, NY, United States
Top Developer Tools Startups in the United States
This list has 603 startups and was last updated on Oct 15, 2026. 157 of them are hiring right now. Biggest hubs: San Francisco (441), New York (75), and Los Angeles (20). Largest teams: GitLab, PagerDuty, and Algolia. Latest round: Supabase raised $150M (Oct 2, 2026).
603 startupsPage 7 of 17
What they do:
The orchestration platform for teams who ship.
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HQ: New York, NY, 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
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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
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HQ: San Francisco, CA, United States
Replicas
Hiring
What they do:
Run any coding agent harness in the cloud
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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
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HQ: San Francisco, CA, United States
What they do:
World's fastest and most optimal route optimization engine
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HQ: Ontario, CA, United States
What they do:
Customer support tool purpose-built for companies that sell APIs
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HQ: Truckee, CA, United States
Blink
Hiring
What they do:
Build fully functional apps with AI.
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HQ: San Francisco, CA, United States
What they do:
Agentic workflows for complex, long running business operations
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HQ: San Francisco, CA, United States
What they do:
No-Code LLM Application / Workflow Builder
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HQ: San Francisco, CA, United States
Star
Hiring
What they do:
Make games with AI - no coding required
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HQ: Springfield, MO, United States
What they do:
The intelligence and execution layer for agentic B2B card payments.
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HQ: New York, NY, United States
What they do:
Plaid for Commercial Real Estate
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HQ: Boston, MA, United States
What they do:
Autonomously scaling environments
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HQ: San Francisco, CA, United States
What they do:
The Agent Analytics Platform
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HQ: Los Angeles, CA, United States
Consus
Hiring
What they do:
The fastest and cheapest way to use AI with ITAR or CUI data.
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HQ: San Francisco, CA, United States
What they do:
Hardware-Aware AI for Embedded Software
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HQ: San Francisco, CA, United States
What they do:
Collaborative AI app builder for teams
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HQ: San Francisco, CA, United States
What they do:
The agent-native serverless cloud
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HQ: San Francisco, CA, United States
What they do:
We give AI agents realtime web context via API
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HQ: San Francisco, CA, United States
What they do:
Cosmic is an AI-powered headless CMS
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HQ: San Francisco, CA, United States
Deepnote
Hiring
What they do:
A better data science notebook.
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HQ: San Francisco, CA, United States
What they do:
Open source agent generation framework
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HQ: San Francisco, CA, United States
What they do:
Safer, faster dependency upgrades
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HQ: New York, NY, United States
What they do:
Unifying how the optical industry does business.
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HQ: Los Angeles, CA, United States
Automat
Hiring
What they do:
Agentic automation that understands context, recovers, and improves.
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HQ: San Francisco, CA, United States
YC W23Growth stage
What they do:
Helps teams work effectively with AI coding agents.
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HQ: San Francisco, CA, United States
What they do:
Generate fast, reliable APIs for any platform
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HQ: San Francisco, CA, United States
Emergent
Hiring
What they do:
AI app builder that turns your ideas into monetizable software.
Quick facts:
HQ: San Francisco, CA, United States
YC S24Growth stage