Who founded Tesseral?

Tesseral was founded by Ned O'Leary, Ulysse Carion in 2023.

Who are Tesseral's investors?

Tesseral's investors include Feedback Ventures, Y Combinator, Andreessen Horowitz, Capitalize VC, Dot Slash Capital, Houghton Street Ventures.

Where is Tesseral headquartered?

Tesseral is headquartered in San Francisco, US.

Tesseral

DefunctYC W24

San Francisco, US · Founded 2023 · 5 employees · 6 known investors

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Tesseral is an open source platform that provides identity and access management for business software, with features including single sign-on, user provisioning, role-based access control, and audit logging. It serves organizations managing access for employees, customers, services, and AI agents.

Also known as Codomain Data Corporation · Codomain Data · Codomain Data, Okapi, SSO Ready, ssoReady, SSOReady · Okapi · SSO Ready · ssoReady

Developer Tools Enterprise Software SaaS Security Open Source APIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (W24)

Tesseral was founded in 2023 by Ned O'Leary and Ulysse Carion.

Ned O'Leary Cofounder & CEO2023–2026Ned O'Leary is cofounder and CEO of Tesseral, an open source identity and access management platform for business software.

Ulysse Carion Cofounder, CTOHe previously worked at Segment, where he developed permissions and identity resolution systems, and at Gem. Carion has contributed to IETF standards, including RFC 8927.

Investors · 6

Feedback Ventureslisted by Feedback VenturesSingapore

How we know: Feedback Ventures's portfolio page · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · funding news · open dataset · 5k.vc investor directory · Not right? Tell us

Andreessen HorowitzreportedMenlo Park · $500K – $50M

How we know: Y Combinator's founder network · Not right? Tell us

Capitalize VCreportedChicago · $100K – $200K

How we know: Y Combinator's founder network · Not right? Tell us

Dot Slash CapitalreportedSeattle

How we know: Y Combinator's founder network · Not right? Tell us

Houghton Street VenturesreportedLondon · $500K – $2.5M

How we know: Y Combinator's founder network · Not right? Tell us

Funding

SEC filings, press & company announcements

Undisclosed amountSeed RoundMay 2025 · 2 sources
Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

Images

Related companies · 10

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authzedAuthZed provides authorization infrastructure that automatically evaluates access permissions based on team and organizational hierarchies, eliminating the need for manual permission syncing and background jobs. The platform serves enterprise software builders who need dynamic access control that updates in real-time as team memberships change.

Companies working in the same space as Tesseral.

Legal entities · 1

corporate structure

Codomain Data Corporation

In the news

Tesseral: the open source auth infrastructure for B2B SaaSycombinator.com · May 2025

Tesseral Raises $3.3M in Seed Fundingfinsmes.com · May 2025

SSOReady: Open source developer tools for enterprise single sign-onycombinator.com · Oct 2024

Frequently asked questions

What does Tesseral do?: Tesseral is an open source platform that provides identity and access management for business software, with features including single sign-on, user provisioning, role-based access control, and audit logging. It serves organizations managing access for employees, customers, services, and AI agents.
Who founded Tesseral?: Tesseral was founded by Ned O'Leary, Ulysse Carion in 2023.
Who are Tesseral's investors?: Tesseral's investors include Feedback Ventures, Y Combinator, Andreessen Horowitz, Capitalize VC, Dot Slash Capital, Houghton Street Ventures.
Where is Tesseral headquartered?: Tesseral is headquartered in San Francisco, US.