Speaking

• LLM Day Warsaw 2025

  Growing AI products, where Science Meets Engineering

  With Aji Ghose, Chief Scientist at Chattermill, we are sharing two perspectives of building AI products: one of an engineer and one of a data scientist. We do it while summarising learnings of over 10 years of Chattermill experience in building AI products.
• LeadDev Berlin 2025

  Machine learning in production. The hidden effort

  The gap between AI demo and AI product is full of hard engineering work. I’m sharing 10 years of experience involving scaling, orchestration and cost optimisation.
• TechFest Madrid 2025, OpenConf Athens 2025, BoilingFrogs Wrocław 2026

  Magical journey through regex engine internals

  I dive deeply into the internals of regex engines. Showing both the theorethical side (regular languages and finite automata) and implmentations (PCRE, Regex virtual machines). I also talk about regex performance and safety.
• StaffPlus 2024, wroc_love.rb 2024, SFI 2024, NDC Copenhagen 2024, Code Europe 2025, nor(dev)con 2025

  Let's Debug Like Scientists

  I share a set of tools to build a collaborative process of debugging. I show how centuries-old scientific practices can be adopted in our young profession. All this supported with real-world stories that prove those methods to be effective.
• RailsConf 2021, RubyDay.it 2021, EMEA on Rails 2021, RubyConf.br 2021, BuildStuff Lithuania 2022

  API Optimisation Tale: Monitor, Fix and Deploy (on Friday)

  Lessons learned during extraction of a complex service from 1M+ LOC monolith. During this project, we migrated an internal API from REST to GraphQL optimising it heavily. I talk about old patterns in a new setting, incremental changes and broken production.
• RRUG

  Database Internals (series of talks)

  I've given a series of in-depth talks about database internals at Rzeszów Ruby User Group meetups:

  • Why Doesn't the Database Use My Index? - how the indexes are built, and how to use them efficiently
  • SELECT or There and Back Again - query processing details, from parsing down to storage and back to the client
  • Full-text Search Inside Out - inverted index explained with simple implementation in Ruby as an illustration
• 4Developers 2018, SegFault 2018, SPA Software in Practice London 2018, Hack Yeah 2018

  Writing Slow Regexp is Easier than You Think and Want it to Be

  Talks and workshops about the performance of regular expressions. I show the internals of a regex engine and this lets me explain how various types of patterns are processed. Finally, I give real-word examples of regular expressions that harmed production applications.
• 4Developers 2019, Rzemiosło.IT 2019

  Who is a Senior Developer

  I interviewed several engineers and managers to understand how they perceive seniority in our industry. I summarised the findings in a short talk. As a follow-up, I also moderated a discussion panel about being a senior developer. We discussed traits of a senior developer, career progression and title inflation.
• wroc_love.rb 2017, 4Developers 2017

  We All Build Distributed Systems

  After working with a system built with only 3 apps - web UI, Android client and API backend I realised that a lot of the problems inherent to distributed systems happen also in this simple setting. In this talk, I describe how we dealt with offline mode, data synchronisation and error resolution