Core expertise
Senior Frontend Developer
Jakub Kwarciński
Building web experiences with clarity, character and care.
A frontend developer with a long-standing love for thoughtful design, clean architecture and after-hours experiments - from indie games to creative tech.
Contact me Explore
16+
years of
experience
experience
About
I build things for the web - and sometimes just for fun.
Over the years, I have grown from crafting pure HTML and CSS interfaces to building scalable enterprise applications. That early focus on the details still shapes how I approach every product.
Today, I work primarily with Angular and TypeScript, designing maintainable frontend architecture, complex state management and real-time applications for high-performance trading environments. I care equally about clean code and interfaces that feel natural to use.
Outside work, I keep exploring through indie game development, home recording and small geeky projects that make me curious enough to build them. When I step away from the keyboard, you’ll usually find me road cycling, playing board games or video games, listening to music, or enjoying culture in all its forms — from the highbrow to the wonderfully lowbrow.
Skills
A focused toolkit for complex frontend work.
I value technology that helps teams build quickly, maintain confidently and deliver interfaces people enjoy using.
Working knowledge
Useful across the wider product lifecycle.
AI-assisted workflow
GitHub Copilot, OpenAI Codex and other AI tools help me accelerate exploration, implementation and quality while keeping engineering judgement in control.
Career
Good design, clean code and great people along the way.
Senior Frontend Developer
StoneX
- Owned major frontend modules in a large-scale internal enterprise trading platform for managing retail accounts, building complex Angular applications with TypeScript, NgRx, RxJS, Ng-Zorro and LESS.
- Developed enterprise UI solutions in React and TypeScript using Material UI, and designed scalable frontend architecture with advanced state management and clean architecture principles.
- Implemented real-time data streaming with WebSockets and Lightstreamer, optimized reactive flows with RxJS caching strategies, and integrated Angular microfrontends into a React shell using Module Federation.
- Built and maintained comprehensive test coverage with Cypress and Jest, performed performance optimizations, and contributed to CI/CD and engineering standards.
Frontend Developer
Miquido
- Developed and maintained large-scale enterprise web applications using AngularJS, Angular and React for international clients including Universal Music Group, HID and 7Digital.
- Designed scalable, maintainable frontend architecture in close collaboration with backend developers and UX/UI designers.
- Mentored junior developers and interns, supporting their onboarding and day-to-day development.
Frontend Developer
Mawelous
- Designed and developed responsive landing pages and corporate websites using HTML, CSS and JavaScript.
- Built internal admin panels and interactive tools using JavaScript, jQuery and AngularJS.
- Delivered frontend solutions for international projects including playstartupalley.com and a4d.com.
Frontend Developer
Veneo
- Developed and maintained websites using HTML, CSS, responsive web design and JavaScript.
- Contributed to large media and corporate projects including tvnwarszawa.tvn24.pl, dziendobry.tvn.pl and mamtalent.tvn.pl.
- Created graphic assets and layouts for smaller projects using Adobe Photoshop.
Education
Before Stack Overflow had all the answers.
2011 - 2013
Jagiellonian University UJ
Electronic Information Processing
Master of Science
2007 - 2010
AGH University of Science and Technology AGH
Information Technology and Econometrics
Bachelor of Science
2003 - 2007
Technical School of Communication in Cracow ZSL
Telecommunications Technician
Professional qualification
Selected work
Projects made for the web - and for the joy of making.
A selection of personal game experiments and web design projects built from concept to finished experience.
Independent projects
Games and experiments
Lost Days Of Spring
2D narrative platformer and metroidvania built in vanilla JavaScript with the HTML5 Canvas API. Step into the shoes of the mysterious Colin La Mehr and uncover the secret of a strange pixel-art planet.
Kalambeer
A Polish word game built with JavaScript, HTML Canvas and a compressed dictionary tree. Find as many words as you can before time runs out.
Web design and development
Templates and websites
Music Nation
A complete responsive template for music-focused newspapers, magazines and news portals.
Equalizer
A colourful, responsive template for music and audio-focused newspapers, magazines and news portals.
Outside
An elegant, business-focused landing page with flexible configuration, ready-made presets and themes.
Home recording
Short songs were never really the plan.
My home recordings live somewhere between progressive rock, layered Porcupine Tree-inspired soundscapes and the kind of melancholic atmosphere that makes Opeth records feel strangely comforting.
Contact
Have a project in mind? Hey Ho Let’s Go!
I am always happy to talk about ambitious frontend products, thoughtful interfaces and interesting ideas.
jakubkwarcinski@gmail.com