Karsten Weng – Web Designer & Frontend Developer in Berlin

Design and development from a single source: accessible, fast and maintainable websites. For over 20 years, for clients like Park-Klinik Birkenwerder.

View projects Get in touch

Projects

Current projects

View all projects

Client since 2017 · Concept, design, development, maintenance

Park-Klinik Birkenwerder

Relaunch of the clinic’s bilingual website (DE/EN) – from UX concept to implementation in PHP, SQLite and vanilla JavaScript.

View the project

Client project · 2024 · Design & development

Prof. Dr. Lisa Y. Haller

Modernisation of the WordPress website. PageSpeed before: around 60; now 100 (desktop) and 93 (mobile).

View the project

Clients

Park-Klinik Birkenwerder
Prof. Dr. Lisa Y. Haller
Hausarztpraxis Mengel & Roggan
Pangolin Doxx Film
STRATO (2005–2025)

Services

From the first sketch to going live

Web design & UX/UI

Concept, information architecture and design of responsive interfaces – focused on usability and brand identity.

Figma · Prototypes · Design systems

Frontend development

Clean, maintainable code for websites and web apps – from HTML and SCSS to React. Or WordPress and PHP when the project needs it.

HTML · SCSS · JavaScript · React · WordPress

Accessibility, performance & SEO

WCAG 2.2 and the German accessibility act (BFSG), Core Web Vitals and technical SEO – planned from the start instead of fixed afterwards.

WCAG · BFSG · Core Web Vitals · JSON-LD

All services in detail

Karsten Weng pointing at a screen with code at a desk while a colleague looks on

About me

A communication designer who writes his own code

I studied communication design and have been building websites for over 20 years: two decades at STRATO, and always for my own clients on the side. Since 2025 I do this full time. Right now I am deepening my backend skills so that I can build projects all the way down to the database myself.

More about me

„I’m absolutely thrilled with your work.“

Dr. med. Ursula Tanzella, Chief physician, Park-Klinik Birkenwerder (translated from German) · 23 October 2026