Mariusz Kozieł - Wizards and Kings
This special episode was recorded from the Buzzsprout podcast booth on Day 1 of Rails World 2025 in Amsterdam. Our guest, Mariusz Kozieł, is the CEO of Visuality, a Ruby on Rails agency based in Poland. We chat about Mariusz' career progression from developer, to engineering manager, to CTO, and now CEO. We also talk about his and Visuality's efforts to foster technical community with the Ruby Community Conference and Ruby Europe.
Thank you to Buzzsprout for sponsoring the Rails World Podcast program, and for providing us the opportunity to attend and record! 🙏
Related Links
Mariusz on Twitter
Mariusz on LinkedIn
Visuality website
Visuality on Twitter
Visuality on LinkedIn
Ruby Europe website
Ruby Europe on Twitter
Ruby Community Conference
Thank you to Buzzsprout for sponsoring the Rails World Podcast program, and for providing us the opportunity to attend and record! 🙏
Related Links
Mariusz on Twitter
Mariusz on LinkedIn
Visuality website
Visuality on Twitter
Visuality on LinkedIn
Ruby Europe website
Ruby Europe on Twitter
Ruby Community Conference
Creators and Guests

Host
Jeremy Smith
Designer & Rails dev • Co-organizing: https://t.co/q8XwVUrgxU • Studio: https://t.co/ZrmGeEnhcI • Side project: https://t.co/X0kD85uiQf • Newsletter: https://t.co/IaoJVazkkr

Host
Jess Brown
Indie rails dev since 08, currently building CSePub & TRACT. Co-host https://t.co/TpDORNDqZV. Family of 4, also interested in faith, crossfit, cycling, RV'ing, finance
