I build fast, accessible web applications that reach millions of users. From the TVN24.pl news platform at Warner Bros. Discovery to insurance purchase flows at Applied Systems.
Over 12+ years across media, insurance, and e-commerce, I've worked on SSR architectures, microfrontend systems, design systems, and Server Driven UI. I have collaborated with international teams across Poland, the US, India, Canada, and Australia.
I care about real performance and shipping things that work.
Built a Server Driven UI insurance purchase flow using a recursive DFS algorithm to render a nested graph of ~60k-line JSON questions. Contributed to an admin panel, user tracking, statistical charts, and WCAG 2.1 AA compliance in an 8-person international team. Kept the codebase maintainable through code reviews and close collaboration with designers, QA, and backend engineers. Shared knowledge across the team by documenting solutions and helping new developers get up to speed with the question graph. Also focused on rendering performance, keeping the form smooth and responsive despite the large number of nested questions.
Built TVN24.pl from scratch using SSR and an islands architecture with microfrontend React + Web Components. Delivered widgets for stocks, weather, polls, elections, TV guides, and a custom SSR rendering algorithm without external libs.
Enhanced an e-commerce site with sliders, carousels, product listings, and a shopping cart. Focused on mobile optimization, SEO, CLS, page speed, and accessibility improvements via Lighthouse audits.
Maintained and developed an internal insurance policy management system for agents and office workers. Built new modules, integrated payment and data verification systems, and worked across Angular frontend and Java/Groovy backend.
Portfolio: https://najwer23.github.io
Résumé: https://najwer23.github.io/resume
X: https://twitter.com/najwer23
LinkedIn: https://www.linkedin.com/in/najwer23
LeetCode: https://leetcode.com/najwer23
NPM: https://www.npmjs.com/~najwer23
Gitfut: https://gitfut.com/najwer23
Nook: https://najwer23.github.io/nook
Blog https://najwer23.github.io/#/blog