Conference speaker. Founder, co-owner and CTO of Planuj Wesele, a Polish wedding-vendors directory built on Rails with an in-progress Next.js front-end migration; most traffic comes from Google. At wroclove.rb 2019 gave a lightning talk combining a 12-year spam/email-leak experiment with a critique of the 'senior developer' title, and announced the release of his Petri-Nets-based performance-prediction Ruby gem. Also spoke at wroclove.rb 2017 on performance of distributed applications. At wroclove.rb 2024 delivered 'How I brought LCP down to under 350 ms' on using Signed Exchanges to optimize Largest Contentful Paint. Blogs about web performance and invited the audience to subscribe for follow-up posts.