Andree Wille
About me Services Technical Skills Portfolio
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About me

Freelance Senior Frontend Developer specialized in React & TypeScript

I apply my many years of experience as a freelance senior frontend developer to streamline complex processes and tailor them to my clients specific needs. My dealings with clients are always in the spirit of respectful and open communication. I take an in-depth look at processes and client requests – with the aim of finding the best possible solutions. Using agile methods, I create an environment where changes and deployments can be implemented at speed.

Frontend Development Services

Technical Skills

Frontend Development

Expert in modern React development. Strong focus on building scalable applications using TypeScript and JavaScript. Experienced in setting up and maintaining frontend architectures, optimizing build processes, and implementing comprehensive testing strategies.

Component Libraries

Specialized in creating and maintaining reusable React component libraries. Proficient in implementing consistent design systems, with experience in building both internal and customer-facing components. Strong emphasis on component documentation and testing.

Frontend Technologies

  • React, TypeScript, JavaScript, Node.js
  • Vite, Vitest, Jest
  • Git, Github, AzureDevOps, CI/CD pipelines
  • Storybook

Development Practices

Experienced in agile methodologies, code reviews, and mentoring junior developers. Focus on creating maintainable, well-documented code with high test coverage.

Portfolio

Freelance Senior Frontend Developer

German audio equipment manufacturer based in Wedemark

Development of a SaaS platform for professional audio device management using React and TypeScript. Creation and maintenance of a shared component library to ensure consistent development across the application. Implementation of key features including user management, location management, device configuration and monitoring capabilities. The technology stack includes Vite and Vitest for optimal frontend development and testing workflows.


Freelance Senior Frontend Developer

Globally operational job platform company based in Düsseldorf

Migrating the search result list and the listing page from legacy code to modern Node.js and React codebases. This role required strong expertise in both legacy codebases and modern Node.js and React development. It involved providing technical leadership, collaborating with team members, conducting code reviews, testing, debugging, and issue resolution and ensuring successful migration to more efficient and maintainable codebases.


Freelance Senior Frontend Developer

Globally operational FinTech company based in Berlin

Development of React / Next.js and TypeScript frontends. Planning, development and testing of the Item Catalog and Tax Management applications, designed for shop owners to optimise their sales processes.


Freelance Senior Web Developer

Platform for teaching materials on digital subjects for teachers

Updating of the Ruby on Rails API and React frontend, as well as the implementation of new features.


Freelance IT Consulting

Hamburg-based Bank

Analysis and documentation of digital processes relating to insurance matters. Especially processes relating to the generation of the Insurance Product Information Document (IPID) and implementation of the Insurance Distribution Directive (IDD). Conception of quality improvements and development of solutions for technical issues.


Freelance Product Owner – Data

B2B Marketplace

Planning, conception and implementation of an internal web application for categorising product data. Conception and implementation of a process for the automated categorisation of product data using machine learning, as well as the conception and implementation of a process for enriching company profiles with the help of web crawling.