Stefan Dietz - Lead Developer for Accessible Components

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Neubiberg, Germany

Check rate

Experience

Mar 2024 - Jun 2025

1 year 4 months

Frontend Developer – Sports Event and City Portal Projects

München Betriebs GmbH

Development of an accessible, responsive website based on Figma designs for a major sports event in compliance with WCAG, BITV, and EN 301 549
Technical planning and setup of the tool stack with Vite, Playwright, Docker, and GitLab CI
Worked on two existing projects (Vue.js & Nuxt), with a focus on bug fixing, accessibility audits, and new feature development
Collaboration with design and QA to consistently implement accessible UI patterns
Consulting on improving existing frontend architectures with regard to accessibility, performance, and maintainability

Jul 2023 - Present

3 years 2 months

Lead Developer Accessible Component Library „KoliBri“

ITZBund

Development and maintenance of accessible web components with Stencil and TypeScript in line with WCAG, BITV, and EN 301 549
Refactoring and API optimization to improve developer experience and reusability
Building and maintaining cross-component theming systems based on design specifications (design tokens, custom properties)
Further development and integration of internal React applications based on KoliBri
Concept and development of a reusable framework for visual regression testing of components and themes
Setup of a monorepo with pnpm workspaces to improve build and development processes
Building CI/CD workflows with GitHub Actions and implementing automated test and release pipelines
Introducing Playwright as the E2E testing standard in the project
Technical leadership of the development team, including mentoring, code reviews, and architecture decisions

Sep 2016 - Jun 2023

6 years 10 months

Munich, Germany

Deputy Team Lead Frontend

CHECK24 Vergleichsportal Baufinanzierung GmbH

Development and scaling of internal and customer-facing web applications with Vue.js, Nuxt, TypeScript, and AngularJS, as well as Java and Spring Boot in the backend
Technical leadership of feature teams and deputy team leadership with a focus on quality assurance, mentoring, and improving team processes
Architecture responsibility within the frontend team: deciding on technologies, modularization, and shared standards to ensure a sustainable codebase
Leading a new website project (Node.js, Express, Nuxt) with a focus on performance – reducing load time by about 90% through targeted code splitting, lazy loading, and optimized caching
Building a universal build and test system with Webpack, Jest, and npm scripts for all frontend projects
Performance optimization of core pages to improve load times and Core Web Vitals
Development of a Node.js microservice with Puppeteer for automated PDF generation
Further development of an internal design system including new components and integration into multiple applications
Introducing and maintaining CI/CD pipelines with Jenkins in close collaboration with DevOps and backend (Java/Spring)
Development of a dashboard for monitoring npm dependencies and automated upgrades
Implementation of linting, testing, and error tracking standards (ESLint, Stylelint, Sentry) across all projects
Conducting technical job interviews, performance reviews, and supporting recruiting

Sep 2013 - Aug 2016

3 years

Munich, Germany

Frontend Developer

SnipClip die digitale Fabrik GmbH

Development of interactive web applications, campaigns, and communities with integration of Facebook, SoundCloud, and Instagram APIs
Building a mobile web app with an offline-first approach and local caching for better availability
Concept and prototyping of a native iPhone and Apple Watch app with Swift
Development of a working prototype for a video chat application with WebRTC
Introducing modern frontend toolchains (Gulp, Babel, Sass, Autoprefixer) to increase development speed
Migration of new projects from server-side rendering with jQuery to modern single-page applications with AngularJS
Backend support with PHP, Symfony, and MariaDB as well as deployment on AWS/CloudControl
Appointed as company shareholder due to very strong performance

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Banking and Finance, Government and Administration, Information Technology, and Sport.

Banking and Finance

Government and Administration

Information Technology

Sport

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Quality Assurance, Project Management, and Product Development.

Information Technology

Quality Assurance

Project Management

Product Development

Summary

Experienced Senior Fullstack Developer with over 10 years of professional experience in building modern web applications and accessible component libraries. Specialized in TypeScript, React, Vue.js, and Node.js, as well as accessible frontend architecture according to WCAG, BITV, and EN 301 549. Experience in technical leadership, team mentoring, and building sustainable DevOps and testing processes (CI/CD, GitHub Actions, Playwright). Combines deep technical know-how with a focus on developer experience, code quality, and performance.

Skills

Frontend Development

Typescript, Javascript, Html5, Css3, Scss
Vue.Js, Nuxt, React, Redux, Stencil, Angularjs, Next.Js, Formik
Responsive Design, Design Tokens, Theming, Accessibility (Wcag 2.1, Bitv, En 301 549, Nvda, Voiceover)
Progressive Web Apps, Offline First
Eslint, Stylelint, Sentry, Storybook, Lighthouse, Core Web Vitals

Backend Development

Node.Js, Express, Java, Spring Boot
Rest Apis, Microservices, Mysql, Mariadb, Oracle

Testing & Qa

Jest, Vitest, Playwright, Backstop.Js, Axe
E2e Testing, Visual Regression Testing, Tdd

Build & Devops

Npm, Pnpm, Webpack, Vite
Docker, Jenkins, Github Actions, Gitlab Ci
Monorepos, Ci/Cd, Dependency Management

Methods & Collaboration

Agile Software Development (Scrum, Kanban)
Version Control With Git (Github, Gitlab, Bitbucket)
Project And Knowledge Management: Jira, Confluence
Code Reviews

Languages

German

Native

English

Advanced

Education

Aug 2010 - May 2013

Webmasterware.net GmbH

Computer Science Specialist in Application Development · Trier, Germany

Statistics

Experience

Total positions 4

Experience in Banking and Finance 7 y

Avg length 3 y 6 m

Longest experience 6 y 9 m

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Frontend Developer – Sports Event and City Portal Projects, Lead Developer Accessible Component Library „KoliBri“, Deputy Team Lead Frontend

Main industries Banking and Finance, Government and Administration, Information Technology

Main business areas Information Technology, Quality Assurance, Project Management

Qualifications

Highest degree Master

Profile

Created

August 2025

Last Update

August 2026

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Frequently asked questions

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Stefan is based in Neubiberg, Germany.

Stefan speaks the following languages: German (Native), English (Advanced).

Stefan has at least 13 years of experience. During this time, Stefan has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 3 years and 3 months. Note that Stefan may not have shared all experience and actually has more experience.

Based on recent experience, Stefan would be well-suited for roles such as: Frontend Developer – Sports Event and City Portal Projects, Lead Developer Accessible Component Library „KoliBri“, Deputy Team Lead Frontend.

Stefan's most recent position is Frontend Developer – Sports Event and City Portal Projects at München Betriebs GmbH.

In recent years, Stefan has worked for München Betriebs GmbH, ITZBund, and CHECK24 Vergleichsportal Baufinanzierung GmbH.

Stefan is most experienced in industries like Banking and Finance, Government and Administration, and Information Technology. Stefan also has some experience in Sport.

Stefan is most experienced in business areas like Information Technology, Quality Assurance, and Project Management. Stefan also has some experience in Product Development.

Stefan has recently worked in industries like Banking and Finance, Government and Administration, and Sport.

Stefan has recently worked in business areas like Information Technology, Quality Assurance, and Project Management.

Stefan holds a Master in Computer Science Specialist in Application Development from Webmasterware.net GmbH.

Stefan is immediately available full-time for suitable projects.

Daily Rate Distribution

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<€960 €960-1120 €1280-1440 €1760+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 956 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000

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Median rate 880 €

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.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.