Jun 2025 – Jan 2026 · 7 mos · Remote

• contributing to and improving the frontend layer of the Todoist App, used by over 30 million people around the world
• proposed and implemented the automated flow for maintaining the feature flags in the frontend app
• contributed to async-first collaboration culture through clear documentation, RFCs, and thoughtful code reviews

May 2024 – Jun 2025 · 1 yr 1 mo · Remote

• extended the frontend layer of the FocalOS app used to manage almost 2k stores
• boosted the app performance by detecting the bottlenecks and addressing them with fixes and improvements to the rendering and fetching logic
• led the cross-team process of migrating the old legacy codebase (React 17, Redux Saga, Thunks, Ramda) to modern solutions in the other parts of the app (React 18, RTK Query)
• developed the e2e testing framework in Playwright and set up the automated sanity checks in GitHub actions that saved 2 hours of daily manual testing by the QA engineers

May 2022 – May 2024 · 2 yrs

• developing the frontend layer of Hotjar’s core product, session recording tool
• developing the frontend features used horizontally across different Hotjar’s products
• taking part in cross-squad initiatives focused on a11y and observability

Jun 2021 – May 2022 · 11 mos · Cracow, Małopolskie, Poland

• developing frontend layer of a Backbase banking platform (with a focus on batch payments used by US banks)
• taking part in the process of creating new prodcut team from scratch (establishing process and workflows)
• cooperating with FE devs from different teams to provide improvements for the FE guild

Aug 2020 – Present · 5 yrs 9 mos

• https://www.youtube.com/channel/UCF4jzVCa2J45NXnNtf6XBoA?sub_confirmation=1
• "Jak zacząć programować?" powstało z myślą o osobach, które chcą postawić swoje pierwsze kroki w kodzeniu lub dowiedzieć się więcej o pracy programisty i branży IT. W materiałach, które tworzymy przekazujemy wiedzę i porady, które sami chcielibyśmy usłyszeć na starcie naszej przygody z programowaniem.

Jul 2016 – Jun 2021 · 4 yrs 11 mos · Kraków, Mazowieckie, Poland

• Developing Frontend layer of Voluum - cloud-hosted tracking software that provides data analytics insights and AI-powered optimization tools to make advertising easier and more profitable.
• Technologies used:
• Angular, RxJS, Typescript, Less, Jasmine, Protractor, AWS, Jade, Jenkins, Circle CI
• Main responsibilities:
• developing frontend layer of Voluum (https://demo.voluum.com/)
• creation of components library used in Voluum project
• taking part in the recruitment process - preparing exercises, reviewing CVs and taking part in job interviews
• writing unit and e2e tests
• mentoring interns and junior devs that joined the team
• sharing knowledge among the team during frontend tech talks

Feb 2016 – Jun 2016 · 4 mos · Kraków, Mazowieckie, Poland

• Developing frontend layer of Brand Fibres Project (social media analysis system): user panel customization, creation of new widgets (charts, word clouds, etc.), refactoring old modules (both .css and .js)
• Technologies used: HTML, SCSS, JS, jQuery, Backbone.js

Apr 2015 – Jan 2016 · 9 mos · Kraków, Mazowieckie, Poland

• Creating frontend layer of big advertising campaigns for major brands (Lays, PZU, Orange and others).
• Technologies used: HTML, CSS, SCSS, JS, jQuery