Short History

  1. While studying at Cambridge, Balint starts working on a data consulting firm called OptimAd.io

  2. Sami joins OptimAd.io as co-founder to help manage its growth

  3. Wanting to pivot into software, Balint & Sami integrate Entrepreneur First's 11th cohort

    Balint Bertok + Sami Jazmati

  4. Company starts moving away from consulting and rebrands as Quantest

  5. First pilot client signed for a product testing mission

  6. Second pilot client signed for a product testing mission

Our Team


Meet our team that works hard on our great company.

Balint Bertok
Balint Bertok
Co-Founder & CEO

Balint is a deep technology enthusiast, with extensive experience in helping big brands launch new products through data-driven marketing. He launched a data consulting firm called OptimAd.io in 2017 alongside Sami Jazmati. Wanting to build a more scalable SaaS model, they joined Entrepreneur First's 11th cohort in London where they pivoted into Quantest.
In his free time, Balint enjoys coding and debating the benefits of A.I.

Balint did his undergrad at ESSEC Business School, completed with postgraduate studies in Entrepreneurship at the University of Cambridge.


Sami Jazmati
Sami Jazmati
Co-Founder & CTO

Sami worked in data, software, and product for years before joining Balint to build OptimAd.io in 2017, where he spearheaded the A/B testing and the behavioural analysis efforts of the company. When they decided to start building a pure software solution, he integreated Entrepreneur First's 11th cohort in London alongside Balint where they pivoted into their quantitative product testing platform Quantest.

Sami did his master in Engineering at HEI with a specialisation in Computer Science, followed by his MSc in Applied Finance at ESSEC Business School.