Hi, I'm Sebastian

I'm a freelance web developer and designer based in London, UK.

I build high quality websites and web apps that provide smooth user experience, intuitive interfaces, and pixel-perfect implementation.

I'm interested in the entire front-end spectrum and working on ambitious projects with positive people. My current focus is on building progressive web apps with modern JS frameworks.

Sebastian Rosloniec


What I Do


My apps are highly optimised to ensure fast load times and lag free interaction
Modularity & Scalability
I build each component as an independent module than can be freely reused, edited, or removed without unintended side-effects
Mobile-First Approach
My projects place mobile-specific code first, to minimize loading time on slower mobile networks at a negligible cost to desktop users
Browser Compatibility
My work uses feature detection to support older browsers while allowing modern ones to take full advantage of the technology
Technical Minimalism
I avoid using bloated 3rd-party plugins whenever essential technologies are sufficiently equipped to handle given needs

Technologies I use

  • JavaScript
  • React + Redux
  • jQuery
  • (S)CSS
  • Node + Express
  • MongoDB
  • Firebase
  • Webpack
  • Gulp
  • Jest + Enzyme

02. Design

I use a combination of graphics, motion, and interactivity to capture users' emotional attention before segueing into the informational content
Responsive Design
My layouts adapt to their surroundings, which assures they will look great on any screen size and any device
Usability vs Creativity
I strive to make my work stand out by providing an aesthetic experience without sacrificing the sense of familiarity and convenience of use
Design with Personality
I seek to capture the individuality and uniqueness of a brand by adding a human touch to the visual identity and aim to showcase a character that interests the persona of the target audience

Tools I use

  • Adobe XD
  • Photoshop
  • Illustrator
  • CorelDRAW
  • Photo-Paint
  • GIMP
  • Gravit


My Work


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