A small team with a clear purpose

How it started

In early 2019, Mart Tamm and Kristjan Rebase were working at a Tallinn-based consultancy that handled financial documents for clients across the EU. The firm used a well-known cloud storage provider. One afternoon, a routine audit revealed that the provider's employees had theoretical access to every uploaded file. The encryption happened server-side, and the provider held the keys.

That felt wrong. Not because the provider had done anything malicious, but because the architecture made abuse possible. Mart and Kristjan spent the next six months building a prototype where encryption happened entirely on the client side, with keys derived from the user's password. The server would store ciphertext and nothing else.

Fileson launched to the public in November 2019 with a free tier and a single paid plan. The first hundred users were mostly Estonian IT professionals who understood the security model and gave direct, unfiltered feedback. That feedback shaped every major product decision since.

Today the team is 35 people across engineering, design, and customer operations. The office is in Ülemiste City, Tallinn's technology district. The company is profitable, privately held, and has not taken venture capital. We intend to keep it that way.