ReJot

We turn complex API integrations into drop‑in full‑stack libraries

Y CombinatorWinter 2025ActiveB2BEngineering, Product and DesignDeveloper ToolsAPIInfrastructureDatabases

What they do

Problem

API companies struggle to help customers implement complex integrations quickly and consistently when they only provide low-level APIs, SDKs, and documentation.

Solution

Fragno is an open-source framework that packages backend endpoints, storage patterns, and frontend utilities into reusable drop-in full-stack integration libraries that customers configure instead of coding.

Who it's for

API providers and their developer customers who need out-of-the-box integrations.

Founders

Wilco Kruijer

Founder

CEO & Co-founder at ReJot, previously worked on a distributed financial platform at Adyen. Interested in the relation between distributed data and software maintainability.

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Jan Schutte

CTO / Co-Founder

CTO & Co-founder at ReJot, former Data Platform Engineer at Adyen, interested in distributed systems and database technologies. Current product is https://fragno.dev/

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