Y Combinator portfolio in San Francisco

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Built from a search like: “Y Combinator-backed companies in San Francisco”

Ranked by current headcount across Y Combinator-backed companies in San Francisco. 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
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
3
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
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4
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
- 10.5k employees
- Founded 2011
5
Deel· San Francisco, California, United States
Deel is one platform for payroll, HR, benefits, mobility, performance, and device management across 150+ countries. Built on owned infrastructure, powered by AI, and supported by thousands of local experts, Deel helps businesses scale smarter, faster, and more compliantly. Trusted by 40,000+ customers, and created to become a global brand people love. Learn more at deel.com.
- Series E
- 9.7k employees
- Founded 2019

6
Rippling· San Francisco, California, United States
Rippling is a workforce management system that eliminates the friction from running a business. Today, most companies struggle with everything from routine tasks, like running payroll, to cross-functional planning, like aligning on headcount. That’s because all their data related to people, processes, and systems is scattered in a hundred places. Rippling has every application you need to run your business—from applicant tracking and payroll to IT and expenses—in one place. But unlike other systems, Rippling sits on top of a unified platform. Data flows dynamically between Rippling’s applications, giving every team a shared source of truth, the power to automate processes, and access to the insights they need. This allows your business to execute better, faster.Based in San Francisco, CA, Rippling has raised $1.2B from the world’s top investors—including Kleiner Perkins, Founders Fund, Sequoia, Greenoaks, and Bedrock.Get help: rippling.com/contactLicensing details: https://app.rippling.com/licensing
- Series G
- 7.8k employees
- Founded 2016
7
Brex· San Francisco, California, United States
Brex is the intelligent finance platform built for speed and control, empowering founders and finance teams to spend smarter and move faster globally with intuitive corporate cards, banking, expenses, and travel. Over 35,000 companies run on Brex, including DoorDash, ServiceTitan, Wiz, and Five Guys. Brex LLC is a wholly owned subsidiary of Capital One, N.A.
- Debt
- 7.5k employees
- Founded 2017
8
Scale AI· San Francisco, California, United States
Scale’s mission is to develop reliable AI systems for the world’s most important decisions. We provide the high-quality data and full-stack technologies that power the world’s leading models, and help enterprises and governments build, deploy, and oversee AI applications that deliver real impact.The Scale Generative AI Platform allows customers to build, evaluate, and control advanced AI agents and applications that continuously improve. The Scale Data Engine provides the technology to collect, curate, and annotate high-quality datasets. Through our Scale Labs, we test models with rigorous benchmarks and novel research to ensure breakthroughs translate into systems people can trust.Scale powers the most advanced LLMs and generative models in the world through RLHF, data generation and model evaluation. We work with industry leaders like Meta, Cisco, DLA Piper, Mayo Clinic, Time Inc., the Government of Qatar, and U.S. government agencies including the Army and Air Force.
- Corporate
- 7.3k employees
- Founded 2016
9
PagerDuty· San Francisco, California, United States
In an always-on world, teams trust PagerDuty to help them deliver an optimal digital experience to their customers, every time. PagerDuty is the central nervous system for a company’s digital operations. We identify issues and opportunities in real-time and bring together the right people to respond to problems faster and prevent them in the future. From digital disruptors to nearly half of the Fortune 500 and the Forbes AI 50s, over 34,000 paid and free customers rely on PagerDuty to help them continually improve their digital operations—so their teams can spend less time reacting to incidents and more time building for the future.Dutonians believe that we are a part of a bigger movement of businesses being built to benefit everyone—the customer and the employee, as well as our community. We are go-getters fueled by the fire to reinvent how people and companies work together. We take the lead and get creative to be first in the hearts of our customers. Whether it’s keeping the world on or changing it entirely, Dutonians are fueled by the fire to reinvent how people and companies work together to deliver in real-time, across the globe.Join us to lead uncharted efforts and reinvent how companies run.
- Post-IPO debt
- 6.9k employees
- Founded 2009
10
Reddit, Inc.· San Francisco, California, United States
Reddit is the heart of the internet, where millions of people get together to talk about any topic imaginable. Share, vote, and decide what matters in everything from breaking news, to fandoms, lifehacks, gaming, sports, health, and the internet’s cutest animals. With over 100,000 subreddit communities about every topic you could think of (and thousands more you couldn’t), whatever it is, there’s a place for you on Reddit. Interested in joining our growing team? Check out redditinc.com/careers.
- Series F
- 5.1k employees
- Founded 2005

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Y Combinator portfolio companies in San Francisco

Y Combinator’s San Francisco portfolio is one of the most active recruiting pools in the market. The list above ranks Y Combinator-backed companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 1,137 matching companies in Refolk’s index, you can see exactly where the Y Combinator thesis has landed locally.

Y Combinator companies in San Francisco tend to attract a specific type of operator - a founder or early hire bought into both the firm’s thesis and the city’s ecosystem. That makes the engineers and designers at these companies particularly valuable signals.

Refolk lets you reach this pool. Ask for “Y Combinator companies in San Francisco hiring founding engineers” or “founders of Y Combinator-backed companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

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

Last refreshed: Sat, 19 Sep 2026 05:17:29 GMT

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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.

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