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.

Edit the query above, or pick a refinement. 500 free credits on sign-up, no card needed.

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 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
Live search
This list is a starting point
I can run a natural-language search across LinkedIn, GitHub, and the open web. Fire one of these, or edit the box up top to match exactly who you're after.
- Y Combinator Developer tools companies in San Francisco hiringRun
- Founders of Y Combinator-backed Developer tools companies in San FranciscoRun
500 free credits on sign-up, no card needed.
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
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
- 7.3k employees
- Founded 2016
7
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
8
Instawork· San Francisco, California, United States
At Instawork, we’re driven by our vision to create economic opportunity for local businesses and skilled hourly professionals in communities around the world. Our accomplished and dedicated team is passionate about our mission and committed to creating products that bring together businesses and skilled hourly workers together in a meaningful way.
- Series D
- 2.7k employees
- Founded 2016
9
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
10
Homebase· San Francisco, California, United States
The everything app for hourly teams with scheduling, time clocks, payroll, messaging, and HR—built for small businesses. Unstoppable teams start here.Best Time Clock 2023 - The Motley FoolBest Scheduling 2023 - InvestopediaAmerica's Best Startup Employers 2024 - ForbesBrands That Matter Winner 2024 - Fast Company Best HR & Employee App 2023, 2024, & 2025 - The Webby AwardsBest employee communication tool ever! - Theresa Fouquette, Owner, Bliss Small Batch Creamery
- Series D
- 2k employees
- Founded 2014

Reveal 812 more·500 free credits, no card

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 817 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.

Refolk converts this list into a live search. Ask for “Y Combinator Developer tools companies in San Francisco hiring senior engineers” or “founders of Y Combinator-backed Developer tools companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist.

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 monthly.

Last refreshed: Sat, 19 Sep 2026 12:21:11 GMT

Search this list

Need an even more specific search?

Refolk runs natural-language searches across LinkedIn, GitHub, and the open web. Try one of these:

500 free credits on sign-up, no card needed.

Related lists

See all company lists.

Slice this list a different way

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 ranking is rebuilt monthly. Last refreshed: Sat, 19 Sep 2026 12:21:11 GMT. For a list built against the index as it stands today, sign up and run the search live.

Can I get the full list of 817 companies?

Yes. This page shows the top of the ranking; sign up and I'll run the search live for the complete, current list. You start with 500 free credits, no card required.

Can I find the people inside these companies?

Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.

Try it on the search you came here for

Stop building boolean strings. Just describe the person.

Type one sentence. I plan the search, read GitHub, public LinkedIn and Crunchbase records, and the open web as it is right now, and hand back a ranked list with the reason next to every name.

01Describe them
One plain sentence. Role, city, stack, stage, whatever matters to you.
02I read the web live
GitHub, public LinkedIn and Crunchbase records, the open web. Not a database that went stale last quarter.
03You read the shortlist
Ranked, with the reasoning under every name. Open a profile, ask a follow-up, narrow it down.

No boolean, no filters, no seat to buy. One box.
Read at search time, so a profile updated yesterday counts today.
Every step visible as it runs, every name with its reason.

500 free credits on sign-up. No card, no demo call. See real searches.

This list is a starting point