Y Combinator Developer tools portfolio in San Francisco

The most prolific seed accelerator in the world, batch class twice a year. Filtered to Developer tools companies headquartered in San Francisco.

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

Ranked by current headcount across Y Combinator-backed Developer tools companies in San Francisco. Refreshed daily.

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
- 82.4k 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
- 72.2k 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
- 25.2k 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
- 14.9k employees
- Founded 2011
5
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

6
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
- 7k employees
- Founded 2016
7
Gusto· San Francisco, California, United States
Gusto has been growing the small business economy for 15+ years. Not with just great technology, but with heart. We serve 500K+ businesses with payroll, HR, benefits, compliance, and more. Small businesses are the backbone of the economy, and we're the team in their corner.Licensing details: https://gusto.com/about/licenses
- Series unknown
- 4.5k employees
- Founded 2011
8
Dropbox· San Francisco, California, United States
Dropbox is the one place to keep life organized and keep work moving. With more than 700 million registered users across 180 countries, we're on a mission to design a more enlightened way of working. To learn more about working at Dropbox, visit jobs.dropbox.comWe also have a few simple guidelines to keep this space respectful and productive. Please avoid:- Harassing other people or using language that’s hateful, offensive, vulgar, or advocates violence- Trolling, fraud and spamming- Violating someone else’s rights or privacy- Advertising or soliciting donations- Link baiting - Posting off topic comments or thread hijackingWe may remove comments that violate these guidelines.
- Post-IPO debt
- 4.2k employees
- Founded 2007
9
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
- 2.4k employees
- Founded 2012
10
Vanta· San Francisco, California, United States
Vanta is the #1 Agentic Trust Platform that helps businesses earn and prove trust. From startup to enterprise, Vanta is trusted by 15,000+ customers, including Atlassian, Duolingo, Icelandair, Ramp and Synthesia, to automate compliance, manage risk, and prove trust continuously—all from a single, AI-powered platform. - Automated Compliance: Automate evidence gathering with continuous monitoring to get you compliant and keep you secure.- Streamlined Audits: Collaborate seamlessly with auditors to help get you audit-ready, fast and hassle-free.- Risk Management: Centralize your IT risk to make informed decisions, whether you’re bringing your own program or building one from scratch.- Vendor Risk Management: Streamline vendor security reviews with AI-powered analysis and continuous monitoring of vendor attack surfaces.- Trust Center: Share your security and compliance posture with buyers with a public-facing Trust Center, and tie your security program to revenue. - Questionnaire Automation: Streamline security questionnaires by having Vanta AI take the first pass for you—so all you need to do is review, approve, and submit.- 375+ integrations: A market-leading ecosystem of over 375 integrations that powers 1,200+ automated, hourly tests, giving you continuous visibility into your compliance posture.- Vanta AI: Supercharge your team with AI-powered control mapping, evidence checks, questionnaire automation, and custom code snippets to remediate failing tests. Founded in 2018, Vanta has customers in 58 countries with offices in Dublin, London, New York, San Francisco and Sydney. Investors include Sequoia, Wellington, Craft Ventures, Y Combinator, Growth Equity at Goldman Sachs Alternatives, J.P. Morgan, Atlassian Ventures and CrowdStrike Ventures.Vanta has been named to the Forbes Cloud 100, CNBC Disruptor 50, Fast Company’s Most Innovative Companies, Inc.’s Best Workplaces, and Forbes’ Best Startup Employer lists.
- Series D
- 2k employees
- Founded 2018

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Y Combinator-backed Developer tools companies in San Francisco

The list above ranks Y Combinator-backed Developer tools companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 663 matching companies in Refolk’s index, you can see exactly where Y Combinator’s Developer tools thesis has landed in San Francisco.

Three filters - investor, industry, city - narrow the field to a tight cluster of operators with overlapping incentives. They share a thesis, a network, and a market. Hiring from this list usually means hiring someone already inside the Y Combinator Developer tools world in San Francisco.

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How this list is built

Refolk pulled Developer tools companies headquartered in San Francisco whose disclosed Crunchbase investor list includes Y Combinator, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 11:32:30 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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