The Good Tech Companies - Tesseral Raises $3.3M Seed to Bring Open Source Auth to B2B Software

Episode Date: May 8, 2025

This story was originally published on HackerNoon at: https://hackernoon.com/tesseral-raises-$33m-seed-to-bring-open-source-auth-to-b2b-software. Tesseral raises $3.3M to simplify enterprise-grade authentication for B2B devs with secure, open source infrastructure built for speed and scale. Check more stories related to startups at: https://hackernoon.com/c/startups. You can also check exclusive content about #tesseral, #b2b-authentication, #open-source-auth, #saml, #scim, #rbac, #startup-funding, #good-company, and more. This story was written by: @seedfunding. Learn more about this writer by checking @seedfunding's about page, and for more stories, please visit hackernoon.com. Tesseral emerges from stealth with $3.3M seed funding to deliver open source authentication infrastructure for B2B software. Backed by Y Combinator leaders and Segment alumni, the platform makes enterprise-grade security fast, flexible, and easy for dev teams to implement—helping startups ship faster without compromising security.

This audio is presented by Hacker Noon, where anyone can learn anything about any technology. Tesserall raises $3.3 million seed to bring open source auth to B2B software, by seed funding announcements. As AI compresses the B2B software development lifecycle, more apps are coming to market than ever before. But business buyers aren't cutting corners on security. Enterprise-grade standards like SAML, SIM, and role-based access control are no longer nice to have for these customers, they're the expectation. For developers, that's a problem. These features are notoriously difficult to implement and can distract from shipping product.

Enter Tesserol, which emerges from stealth today with $3.3 million in seed funding totake that burden off developers' shoulders. The San Francisco-based startup is building the open-source authentication infrastructure for B2B software, on a mission to make security by default the new baseline. For all the changes that will visit the SaaS industry over the next decade, authentication isn't going anywhere, and fast-moving teams can't afford to burn time and energy building in-house solutions, Ned O'Leary, Tesserol co-founder and CEO explained. Tesserol empowers startups with secure, production-grade infrastructure that's fast to implement, easy to maintain, and secure.

Co-founders Ned O'Leary and Ulysse Carrion met while working atEM, where they bonded over a shared enthusiasm for solving problems most people try to avoid. Ned previously worked at BCG, specializing in M&A and corporate strategy. Ulysse, a veteran security engineer, led identity efforts, including SSO, permissions, and audit logging, at Segment through its $3.2 billion acquisition by Twilio. at Segment through its $3.2 billion acquisition by Twilio. Before launching Tesserol, the pair built SSO Ready, an open-source SAM LOTH tool used by early adopters like Gumloop, Govi, and RunReveal. Tesserol counts a stacked group of early-stage investors, including Dalton Caldwell, Y Combinator Managing Partner, Jessica Livingston and Paul Graham, Y Combinator co-founders. Calvin French-Owen,

co-founder and former chief technology officer of Segment. Steve Bartle and Nick Bushack, co-founders of Gem. And Mike Vyechek, founder of Stairwell, among others. "'Everyone needs OTH, but it's still surprisingly painful,' said Caldwell. Ned and Ulysse have built something elegant that developers actually want to use, and that's rare. With fresh capital in hand, Tesserol is scaling its open-source platform to offer developers flexibility and high-growth companies the enterprise-grade capabilities they need to build with confidence.

The platform is open for early access at www.teserol.com. Thank you for listening to this Hacker Noon story, read by Artificial Intelligence. Visit hackernoon.com to read, write, learn and publish.