Y Combinator · W21
Y Combinator Winter 2021 startups
RemJobs lists 229 startups from Y Combinator's Winter 2021 batch. 115 of the 229 startups are based in the United States, and 42 in San Francisco. Between them they are in 36 countries and 87 cities. 23 are hiring remotely.
Updated
- startups
- 229
- countries
- 36
- cities
- 87
- hiring remotely
- 23
Winter 2021 startups
- WeekdayYC W21Weekday is an AI sourcing agent for outbound recruiting in 2026. We reach passive candidates over email, WhatsApp, and phone at a 50%+ response rate. Bengaluru, India Remote: India
- SigNozYC W21SigNoz Cloud is a one-stop observability tool built on top of OpenTelemetry. Get APM, logs, traces, metrics, exceptions, AI observability & alerts in a single tool. San Francisco, United States Remote: Europe, India +1
- authzedYC W21We build the tools companies need to provide performant and scalable authorization for their applications. We’re founded by 3 successful entrepreneurs with expertise in enterprise… United States Remote: Canada, United States
- EnodeYC W21One platform for energy retailers and the teams that trade for them. Connect every asset, coordinate every home, and shape thousands as one. Oslo, Norway Remote: Europe
- AbacumYC W21Abacum is the AI-native FP&A platform built for CFOs to connect data, workflows and teams, simplifying planning and reporting with 700+ integrations. New York City, United States Remote: Europe, Spain +1
- CamberYC W21We’re on a mission to make behavioral health more available and accessible. We're backed by a16z, YCombinator, Craft, and many others to make this dream a reality. At Camber, we… New York City, United States Remote: United States
Members only
223 more W21 startups
Unlock the full list, every company on the map, and their founders, emails, LinkedIn and careers pages.
Where they are
49 more in other countries or with no known location
Hiring remotely
23 startups from W21 had at least one open remote role when their job boards were last read, 152 remote roles between them.
Other batches
Questions
How many startups are in Y Combinator's Winter 2021 batch?
RemJobs lists 229 startups from the Winter 2021 batch (W21) as of Oct 2, 2026, including Weekday, SigNoz, authzed, Enode and Abacum. The count covers the companies we have found, which may be fewer than the batch itself.
Where are Y Combinator Winter 2021 startups based?
115 of the 229 startups are based in the United States, and 42 in San Francisco. Between them they are in 36 countries and 87 cities. By country: United States (115), India (23), United Kingdom (12), Canada (10) and Mexico (8).
Which W21 startups are hiring remotely?
23 startups had open remote roles when their job boards were last read, 152 remote roles between them, including Weekday, SigNoz, authzed, Enode and Abacum.
Can I contact the founders of W21 startups?
Each company has a free public profile. 29 of them have founder names on file, and members see the founders, their emails where found, LinkedIn and careers pages, and every company on the map.
Companies come from public sources: their own websites, public startup directories and accelerator portfolios, and their public job boards (Greenhouse, Lever, Ashby), which were last read through Oct 2, 2026. A company that is missing or out of date can write to us from the footer.