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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Built from a search like: “Y Combinator-backed Developer tools companies”

Ranked by current headcount across Y Combinator-backed Developer tools companies. Refreshed monthly.

1
DoorDash· 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
- 83.2k employees
- Founded 2013
2
Airbnb· 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
- 72.9k employees
- Founded 2007
3
Instacart· 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
- 25.3k employees
- Founded 2012
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4
Twitch· 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
- 14.5k employees
- Founded 2011
5
Café (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
- 14.1k employees
- Founded 2020

6
Carta· San Francisco, California, United States
Carta powers interconnectivity in private markets — uniting data, people, and workflows in one connected system.We connect founders, investors, and limited partners through software purpose-built for private capital. Trusted by 50,000+ companies in 160+ countries, Carta’s platform of software and services lays the groundwork so you can build, invest, and scale with confidence.Carta’s Fund Administration platform supports 8,500+ funds and SPVs, representing nearly $185B in assets under management, with tools designed to enhance the strategic impact of fund CFOs. Carta has been included on the Fortune Best Large Workplaces in Financial Services and Insurance and Best Workplaces in the Bay Area lists, Forbes’ list of the World's Best Cloud Companies, Fast Company's Most Innovative list, Inc.'s Fastest-Growing Private Companies list, and is certified as a Great Place to Work for 2025-2026 (3 years running!). For more information, visit carta.com.
- Series unknown
- 11.7k employees
- Founded 2012
7
Faire· San Francisco, California, United States
Faire is a wholesale technology platform empowering brands and retailers to strengthen the unique character of local communities.
- Secondary
- 10.9k employees
- Founded 2017
8
Amplitude· San Francisco, California, United States
We help companies unlock the power of their products. ⚡• Join the team: http://amplitude.com/careers• Join the community: http://community.amplitude.com
- Secondary
- 10.1k employees
- Founded 2012
9
Gusto· San Francisco, California, United States
Gusto has been growing the small business economy with technology and heart for more than a decade. Launched in 2012 as ZenPayroll, today Gusto serves more than 500,000 businesses nationwide. Each year we process tens of billions of dollars of payroll and provide employee benefits—like health insurance and 401(k) accounts—while helping companies create incredible work places.Through one refreshingly easy, integrated platform, we automate and simplify your payroll, benefits, and HR, all while providing expert support. You and your employees will get the peace of mind you need to do your best work.We offer:▪️ Automated Tax Filing▪️ Comprehensive HR & Benefits▪️ Contractor Support▪️ Integrations & Employee Self-Service▪️ And so much moreWe started Gusto with a simple belief: small businesses are the backbone of the American economy. And they deserve a partner that is committed to making their life better.
- Secondary
- 10k employees
- Founded 2011
10
Snap Inc.· Santa Monica, California, United States
Snap is a technology company. We believe the camera presents the greatest opportunity to improve the way people live and communicate. Snap contributes to human progress by empowering people to express themselves, live in the moment, learn about the world, and have fun together. The Company’s three core products are Snapchat, a visual messaging app that enhances your relationships with friends, family, and the world; Lens Studio, an augmented reality platform that powers AR across Snapchat and other services; and its AR glasses, Spectacles.
- Post-IPO debt
- 8.1k employees
- Founded 2011

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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. 1,252 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.

How this list is built

Refolk pulled Developer tools companies whose disclosed Crunchbase investor list includes Y Combinator, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes monthly.

Last refreshed: Fri, 16 Oct 2026 00:06:21 GMT

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