Y Combinator portfolio Developer tools companies
The most prolific seed accelerator in the world, batch class twice a year. Filtered to companies in Developer tools.
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- InvestorY Combinator
- IndustryDeveloper tools
- Matches1,242
Built from a search like: “Y Combinator-backed Developer tools companies”
Ranked by current headcount across Y Combinator-backed Developer tools companies. Refreshed daily.
- 1DoorDash· San Francisco, California, United States
At DoorDash, our mission to empower local economies shapes how our team members move quickly and always learn and reiterate to support merchants, Dashers and the communities we serve. We are a technology and logistics company that started with door-to-door delivery, and we are looking for team members who can help us go from a company that is known for delivering food to a company that people turn to for any and all goods. DoorDash is growing rapidly and changing constantly, which gives our team members the opportunity to share their unique perspectives, solve new challenges, and own their careers. Our leaders seek the truth and welcome big, hairy, audacious questions. We are grounded in our company values, and we make intentional decisions that are both logical and display empathy for our range of users—from Dashers to Merchants to Customers.
- Post-IPO debt
- 82.4k employees
- Founded 2013
- 2Airbnb· San Francisco, California, United States
Airbnb was born in 2007 when two hosts welcomed three guests to their San Francisco home, and has since grown to over 5 million hosts who have welcomed over 2 billion guest arrivals in almost every country across the globe. Every day, hosts offer unique stays, experiences and services that make it possible for guests to connect with communities in a more authentic way.
- Post-IPO debt
- 72.2k employees
- Founded 2007
- 3Instacart· San Francisco, California, United States
Instacart is a leading grocery technology company that partners with more than 2,200 retail banners – representing nearly 100,000 stores – to transform how people shop for the groceries they need from the retailers they trust, while creating flexible earning opportunities for shoppers. Through the Instacart Marketplace, Instacart Enterprise platform, and Instacart Ads ecosystem, the company powers ecommerce, fulfillment, in-store technology, AI offerings, and advertising for partners. With Instacart Health, the company is providing tools to increase nutrition security, make healthy choices easier for consumers, and expand the role that food can play in improving health outcomes. For more information, visit www.instacart.com/company.
- Private equity
- 25.2k employees
- Founded 2012
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- 4Twitch· San Francisco, California, United States
Twitch is where thousands of communities come together for whatever, every day. Together for streamers. Together for games we love. Together for each other.
- Series C
- 14.9k employees
- Founded 2011
- 5Café (YC S21)· New York, New York, United States
Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.Employees can discover colleagues, coordinate in-person meetings, and manage internal events — all in one platform.By connecting teams across locations and departments, Café boosts productivity, knowledge sharing, and organizational alignment.Make your workforce more connected, engaged, and collaborative ☕️
- Pre-seed
- 13.7k employees
- Founded 2020
Y Combinator’s Developer tools portfolio
The list above ranks Y Combinator-backed Developer tools companies by current headcount, drawn from public LinkedIn and Crunchbase records. 1,242 matching companies in Refolk’s index give you a quick read on where Y Combinator has gone deepest in the Developer tools space.
Y Combinator’s Developer tools bets tend to share a thesis. The engineers, ML researchers, and founders inside these companies are often building the same primitives - and they show up in Developer tools talent pools across the next decade.
Refolk converts this list into a live search. Ask for “Y Combinator Developer tools companies hiring senior engineers” or “founders of Y Combinator-backed Developer tools companies” and Refolk returns a fresh ranked shortlist.
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Last refreshed: Wed, 05 Aug 2026 10:57:07 GMT
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Common questions
How is this ranking built?
The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.
How fresh is the data?
The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 10:57:07 GMT.
Can I get the full list of 1,242 companies?
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Can I find the people inside these companies?
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