Founders

Started by people who waited a week for a retention query

Tessaly was founded in 2020 by a product manager, an engineer and an analyst who were tired of arguing about features without numbers.

Join the founding team's next chapter

We are 46 people across Berlin and remote, hiring in engineering, data and design.

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  • Portrait of Maja Kowalczyk

    Co-founder & CEO

    Maja Kowalczyk

    Maja led product at two B2B start-ups and spent most roadmap reviews arguing about which features kept customers. She started Tessaly so those arguments end with a chart. She still reads every churn survey herself.

  • Portrait of Felix Brandt

    Co-founder & CTO

    Felix Brandt

    Felix spent eight years building data infrastructure in Berlin before writing the first Tessaly ingestion service on a train to Munich. He owns query speed and refuses to let a dashboard take longer than two seconds.

  • Portrait of Nadia Ferreira

    Co-founder & Head of Data

    Nadia Ferreira

    Nadia was the analyst everyone queued behind. She designed the cohort model behind every Tessaly retention view and now leads the team that keeps our numbers honest, from sampling rules to warehouse sync.