David B.-Senior Frontend Developer & UX Designer
Check rate
Experience
TypeScript Developer & UX Designer
colle-il-diaccino.de
TOURISM
colle-il-diaccino.de · Holiday Accommodation
- Designed and developed the website: interactive site map, accommodation comparison, and image galleries.
- Implemented German, English, and Italian language versions. Set up inquiry forms with input validation and spam protection, language-specific SEO metadata, and automated tests.
Stack: Next.js, React, TypeScript, Tailwind, next-intl, React Hook Form, Zod, Resend, Playwright, Vitest
TypeScript Developer & UX Designer
blau-weiss-kassel.de
CLUB / SPORTS
blau-weiss-kassel.de · Club Website
- Designed and developed the club website, including team pages, news, and a filterable events calendar synchronized with the CMS.
- Migrated WordPress galleries to Builder.io. Implemented gallery management, image optimization, a responsive lightbox, and a contact form.
Stack: Next.js, React, TypeScript, Tailwind, Builder.io, React Hook Form, Resend
Founder / Fullstack Product Engineer / UX Designer
Ondoko
Ondoko · Online Doppelkopf
- Developed the game engine, lobby, game tables, and spectator mode; game sessions are stored permanently.
- Implemented WebSocket communication and real-time synchronization. Integrated voice chat, mobile apps, push notifications, sign-in, and premium billing, and tested the application.
- Connected Amazon Simple Email Service (SES) for email delivery.
- While working on Ondoko, I deepened my skills in Agentic Development.
- The development project is complete. I continue to operate the platform.
Stack: Next.js, React, TypeScript, Tailwind, shadcn/ui, PartyKit, PostgreSQL, Drizzle, Better Auth, LiveKit, Capacitor, RevenueCat, React Email, Amazon SES, GitHub Actions
Frontend Architect / UX Designer
Paceteq
MOTORSPORT
Design System & Race Control:
- Developed a design system based on shadcn/ui, with its own component registry and customizable colors, fonts, and shapes.
- Developed the frontend architecture and UX for Race Control. The application synchronizes video streams and telemetry data for race officials.
Stack: React, Tailwind, shadcn/ui, Registry, Theming, Ant Media Server, REST API, TanStack Query, GitLab CI/CD · Methodology: Scrum
TypeScript Development · UX Collaboration with Another UX Designer
biohtin.de
HEALTHCARE
biohtin.de · Brand Website
- Developed product lists, detail pages, and variant selection. Implemented purchase dialogs with a pharmacy finder and links to online pharmacies.
- Developed a CMS-driven product advisor with follow-up questions based on answers and input validation. Revised mobile views and interactions.
Stack: Next.js, React, TypeScript, Tailwind, Builder.io, Radix UI/shadcn, React Hook Form, Zod
TypeScript Development · UX collaboration with another UX Designer
ipalat.de
HEALTHCARE
ipalat.de · Brand website
- Developed product selection and purchase dialogs with a pharmacy finder, online purchase links, and a permanently visible purchase button.
- Integrated product reviews and Builder.io components and revised mobile views.
Stack: Next.js, React, TypeScript, Tailwind, Builder.io, Radix UI/shadcn
Senior Frontend Architect / UX Designer
Symbiofy.ai
- Further developed a multi-tenant AI platform for pharma teams with AI Chat, SymbioBots, knowledge management, research and health check workflows.
- Introduced dark mode for central product areas and reusable UI components.
- Set up internationalization for three language versions with centralized translations, localized error messages, and accompanying quality checks.
- Continuously improved the UX/UI of complex workflows, especially the chat experience, navigation, admin/configuration areas, tool outputs, and PDF/export functions.
Frontend Architect / UX Designer
paceteq
MOTORSPORT
- Developed the frontend and UX of a platform for managing racetrack data.
- Designed interfaces for video, telemetry, and position data. Implemented filters, multiple selection, previews, and detail views for AI-categorized photos.
Stack: Next.js, Tailwind, shadcn/ui, Prisma, REST API, TanStack Query, GitLab CI/CD · Working method: Scrum
Senior Frontend Developer / UX Designer
yoself.de
- Co-responsible for developing an e-commerce shop and a digital sleep check for personal sleep analysis.
- Translated the UX/UI concept into production-ready Next.js interfaces and integrated Shopify and Firebase services.
- Designed and implemented the questionnaire flow, evaluation, and navigation, and connected DatoCMS and GraphQL.
Frontend Developer / UX Designer
OZG-Cloud
- Frontend development of a specialized application for managing applications, including case management, comments, message processing, and displaying user data.
- Lead UX design for the conception and implementation of complex administrative workflows.
- Designed and implemented accessibility concepts in a public-sector context.
Stack: Angular 11–14, Material UI, Java, MongoDB, WCAG, Jenkins · Working method: Scrum, Clean Code
Frontend Developer / UX Designer
Hamburger Schiffsregister
- Frontend development and UX design for a specialist application for managing ship data, contact details and messaging processes.
- Lead UX design for structuring and implementing workflows related to public administration.
- Responsibility for accessibility concepts and their implementation in a regulated application environment.
Stack: Angular 7–9, Material UI, Java, PostgreSQL, SecSigner, WCAG, Jenkins · Working method: Scrum, Clean Code
Managing Director
Micromerce
- As Head of Frontend and UX Designer, designed and developed a platform for personalized customer communication. Initially also Managing Director; continued working on project-based assignments after leaving the management team.
- Implemented content management, loyalty programs and shop management.
Stack: JavaScript, HTML, CSS / Sass
Frontend Developer
OTTO
- Developed a social news feed with user interaction, profile service and editorial product references.
- Developed a web tool for creating fashion compositions, including a like service.
- Further developed key shop areas such as search, navigation, product lists and product detail pages.
Web Developer
Various
- Designed and developed a coaching platform, including a mobile app for personalized content.
- Developed an iOS app with a customer CMS and published a native iOS app for the FIFA World Cup.
- Implemented multilingual email campaigns and rich media websites.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Media and Entertainment, Retail, Government and Administration, Sport, and Pharmaceutical.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Marketing.
Summary
Senior Frontend Engineer and UX Designer with over 20 years of experience developing complex web applications. Focus on Next.js, React, TypeScript, real-time applications, UX design, and modern AI-supported products. Experience in e-commerce, the public sector, motorsport, healthcare, and product-focused full-stack development.
Not just a frontend implementer, but a product-focused engineer with a UX background: strong in early product phases, complex workflows, architecture decisions, design systems, accessibility, and delivering modern web products through to production.
Skills
- Frontend Architecture
- Ux/Ui Design
- Responsive Design
- Product Engineering
- Next.Js
- React
- Typescript
- Realtime Apps
- Ai / Agentic Development
- Accessibility
Frontend & Architecture
- Typescript
- React
- React Email
- Next.Js
- Angular
- Astro
- Javascript
- Html
- Css
- Tailwind Css
- Sass
- Ssr (Server Side Rendering)
- Next-Intl
- Vanilla Js
- Jquery
Ux/Ui & Design Systems
- Responsive Design
- Wcag
- Figma
- Radix Ui/Shadcn
- Storybook
- Material Ui
- Rapid Prototyping
- Sketch
Ai & Development
- Agentic Development
- Codex / Chatgpt
- Claude Code
- Cursor
- Vercel Ai Sdk
- T3 Code
State & Forms
- Tanstack Query
- Zustand
- React Hook Form
- Zod
- Rxjs
- Ngrx
Data & Backend
- Postgresql
- Graphql
- Apollo
- Rest Api
- Drizzle
- Prisma
- Supabase
- Better Auth
- Nextauth.Js
- Firebase
- Mongodb
- Mysql
Real-Time & Mobile Apps
- Partykit
- Livekit
- Capacitor
- Revenuecat
Cms & Integrations
- Builder.Io
- Datocms
- Shopify
- Resend
- Amazon Ses
- Ebusy
Testing & Code Quality
- Playwright
- Vitest
- E2e Testing
- Unit Testing
- Clean Code
- Tdd
- Jest
- Jasmine
- Karma
Build & Pipelines
- Jenkins
- Gitlab Ci/Cd
- Github Actions
Agile Collaboration
- Scrum
- Kanban
- Agile Work
- Pair Programming
Languages
Education
Hochschule für Angewandte Wissenschaften Hamburg
Dipl.-Ing. Medientechnik, Schwerpunkt Computergenerierte Medien · Media Technology · Hamburg, Germany
Berufsbildendes Gemeinschaftswerk Kassel
Industrie-Elektroniker · Equipment Technology · Kassel, Germany
Freie Waldorfschule Kassel
Abitur · Kassel, Germany
Certifications & licenses
WCAG-Schulung
mgm technology partners
Webanwendungssicherheit
Tele-Consulting security
borlsgloger
Statistics
Experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
David is based in Kassel, Germany and can operate in on-site, hybrid, and remote work models.
David speaks the following languages: German (Native), English (Intermediate).
David has at least 21 years of experience. During this time, David has worked in at least 11 different roles and for 14 different companies. The average length of individual experience is 2 years and 6 months. Note that David may not have shared all experience and actually has more experience.
Based on recent experience, David would be well-suited for roles such as: TypeScript Developer & UX Designer, Founder / Fullstack Product Engineer / UX Designer, Frontend Architect / UX Designer.
David's most recent position is TypeScript Developer & UX Designer at colle-il-diaccino.de.
In recent years, David has worked for colle-il-diaccino.de, blau-weiss-kassel.de, Ondoko, Paceteq, and biohtin.de.
David is most experienced in industries like Information Technology, Media and Entertainment, and Retail. David also has some experience in Government and Administration, Sport, and Pharmaceutical.
David is most experienced in business areas like Information Technology, Product Development, and Marketing.
David has recently worked in industries like Information Technology, Government and Administration, and Retail.
David has recently worked in business areas like Information Technology, Product Development, and Marketing.
David holds a Master in Media Technology from Hochschule für Angewandte Wissenschaften Hamburg.
David has 3 certificates. These include: WCAG-Schulung, Webanwendungssicherheit, and Agile Coaching Team.
The availability of David needs to be confirmed.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 26 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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