---
title: "Tesseral gets $3.3M funding for B2B authentication platform; investors include Y Combinator, Segment CTO, Stairwell founder."
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/238933215.md"
description: "In San Francisco, Tesseral, the open-source authentication infrastructure for B2B software companies, has revealed its emergence with $3.3 million in seed funding. Key investors encompass Y Combinator, Jessica Livingston, Paul Graham (Y Combinator co-founders), Calvin French-Owen (Segment's co-founder and ex-CTO), Steve Bartel, Nick Bushak (Gem's co-founders), and Mike Wiacek (Stairwell's founder). Authentication is crucial for B2B software security, and Tesseral aims to revolutionize this sector."
datetime: "2025-05-06T13:28:09.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/238933215.md)
  - [en](https://longbridge.com/en/news/238933215.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/238933215.md)
---

# Tesseral gets $3.3M funding for B2B authentication platform; investors include Y Combinator, Segment CTO, Stairwell founder.

In San Francisco, Tesseral, the open-source authentication infrastructure for B2B software companies, has revealed its emergence with $3.3 million in seed funding. Key investors encompass Y Combinator, Jessica Livingston, Paul Graham (Y Combinator co-founders), Calvin French-Owen (Segment's co-founder and ex-CTO), Steve Bartel, Nick Bushak (Gem's co-founders), and Mike Wiacek (Stairwell's founder). Authentication is crucial for B2B software security, and Tesseral aims to revolutionize this sector.

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