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freiberufler Software Engineer and Tech Lead with 20 yrs+ experience auf freelance.de

Software Engineer and Tech Lead with 20 yrs+ experience

online
  • 90‐125€/Stunde
  • Berlin
  • auf Anfrage
  • de  |  en
  • 15.12.2025
  • Contract ready
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Kurzvorstellung

Software Engineer and Tech Lead (Freelance) with 20 yrs+ experience. Developer, Architect, Coach, Speaker, Interim Head of Development/CTO. React Native / Typescript / JS / Ruby on Rails

Geschäftsdaten

 Freiberuflich
 Steuernummer bekannt
 Berufshaftpflichtversicherung aktiv

Qualifikationen

  • JavaScript
  • Projektleitung / Teamleitung (IT)
  • React (JavaScript library)1 J.
  • React Native5 J.
  • Recruiting2 J.
  • Ruby5 J.
  • Software Architecture8 J.
  • Team Building5 J.
  • Typescript4 J.

Projekt‐ & Berufserfahrung

Freelance React Native Team Lead | Principal React Native Architect
BARMER, Berlin
2/2024 – offen (1 Jahr, 11 Monate)
Gesundheitswesen
Tätigkeitszeitraum

2/2024 – offen

Tätigkeitsbeschreibung

• Led the technical vision and mobile architecture for one of Germany’s largest health insurance platforms
• Mentored and coached a team of React Native developers, improving engineering practices and delivery consistency
• Structured and facilitated developer meetings to enhance collaboration, decision-making, and technical alignment
• Directed major modernization efforts, including migrating the codebase to a monorepo and upgrading React Native versions
• Increased code quality, maintainability, and development speed through strategic architecture and tooling improvements

Eingesetzte Qualifikationen

Lead Developer, Software Architecture, Typescript, React Native

Freelance Principal Software Architect | React Native Team Lead | Recruiting Specialist
SAP, Berlin
12/2022 – 9/2023 (10 Monate)
IT & Entwicklung
Tätigkeitszeitraum

12/2022 – 9/2023

Tätigkeitsbeschreibung

• Built and led a 5-developer React Native team for a European government project, also contributed to its open-source release
• Designed and implemented the app architecture, selected the tech stack, and guided feature development
• Conducted developer interviews and onboarding, fostering team motivation and productivity
• Presented bi-weekly project updates to government stakeholders, highlighting progress and technical achievements
• Oversaw testing, CI pipeline management, release processes, and roadmap creation
• Open source code available here: https://github.com/kulturpass-de/kulturpass-app
• Built and led a 5-developer React Native team for a European government project, also contributed to its open-source release
• Designed and implemented the app architecture, selected the tech stack, and guided feature development
• Conducted developer interviews and onboarding, fostering team motivation and productivity • Presented bi-weekly project updates to government stakeholders, highlighting progress and technical achievements
• Oversaw testing, CI pipeline management, release processes, and roadmap creation
• Open source code available here: https://github.com/kulturpass-de/kulturpass-app

Eingesetzte Qualifikationen

Figma, Projektleitung / Teamleitung (IT), React Native, Recruiting, Software Architecture, Typescript

Freelance React Native Advisor, Architect and Developer, Recruitment Support
skoove, Berlin
6/2022 – 11/2022 (6 Monate)
IT & Entwicklung
Tätigkeitszeitraum

6/2022 – 11/2022

Tätigkeitsbeschreibung

• Conducted a full audit of the existing mobile codebase and advised on best practices for maintenance and future development
• Developed features and improvements for the Skoove React Native app
• Supported recruitment by conducting senior developer interviews and evaluating candidates’ technical fit

Eingesetzte Qualifikationen

React Native, Recruiting, Software Architecture, Typescript

Freelance Principal Software Architect & Lead Developer
Healy World, Berlin
8/2020 – 1/2021 (6 Monate)
Gesundheitswesen
Tätigkeitszeitraum

8/2020 – 1/2021

Tätigkeitsbeschreibung

• Developed a prototype back-office mobile app and PWA for an international medical devices company
• Designed APIs compatible with the app and future integrations
• Oversaw architecture and development to align with business goals and technical requirements

Eingesetzte Qualifikationen

React (JavaScript library), React Native, Sketch, Typescript

Freelance React Native Developer
Urban Sports GmbH, Berlin
5/2019 – 4/2020 (1 Jahr)
IT & Entwicklung
Tätigkeitszeitraum

5/2019 – 4/2020

Tätigkeitsbeschreibung

• Developed the Urban Sports Club mobile app, implementing key features and performance improvements
• Advised on mobile and backend architecture for cross-functional teams
• Participated in hiring processes for senior developers and leadership roles
• Delivered lightning talks and shared expertise at React Native meetups

Eingesetzte Qualifikationen

Figma, React Native, Recruiting

Freelance React Native Developer @snowthority
wetter.com AG, Berlin
12/2018 – 2/2019 (3 Monate)
IT & Entwicklung
Tätigkeitszeitraum

12/2018 – 2/2019

Tätigkeitsbeschreibung

• Developed the Snowthority app, implementing key features and maintaining performance

Eingesetzte Qualifikationen

React Native, Typescript

Freelance Software Architect, Developer and Team Coach @Fintech Startup
Finiata, Berlin
5/2018 – 11/2018 (7 Monate)
Finanzdienstleister
Tätigkeitszeitraum

5/2018 – 11/2018

Tätigkeitsbeschreibung

• Designed and developed greenfield fintech projects, including website and app features
• Guided junior developers, conducted senior interviews, and reviewed product specifications

Eingesetzte Qualifikationen

React (JavaScript library), Schulung / Coaching (allg.), Team Building

Freelance React Native Architect & Developer - Travel App
BCG X, Berlin
11/2017 – 2/2018 (4 Monate)
IT & Entwicklung
Tätigkeitszeitraum

11/2017 – 2/2018

Tätigkeitsbeschreibung

Freelance Principal Software Architect & Lead Developer
Freelance Principal Software Architect & Lead Developer
BCG X · FreelanceBCG X · Freelance
Nov 2017 - Feb 2018 · 4 mosNov 2017 to Feb 2018 · 4 mos
Berlin Area, GermanyBerlin Area, Germany
• Designed and implemented a React Native app for a venture driven by an undisclosed airline targeting business travelers, integrating with a complex backend
• Led a small agile team, onboarding developers to React Native and Redux practices
• Defined app architecture, selected tech stack, and ensured maintainable, scalable code

Eingesetzte Qualifikationen

Prototyping, React Native

Freelance React Native Developer
23 Ways, Berlin
9/2017 – 11/2017 (3 Monate)
IT & Entwicklung
Tätigkeitszeitraum

9/2017 – 11/2017

Tätigkeitsbeschreibung

Implementation of a prototype for a maps app for ios: technology-stack evaluation, guidance while testing & deploying

Eingesetzte Qualifikationen

React Native

Software Architect & Fullstack Freelance developer
EdenspiekermannEdenspiekermann, Berlin
5/2017 – 10/2017 (6 Monate)
IT & Entwicklung
Tätigkeitszeitraum

5/2017 – 10/2017

Tätigkeitsbeschreibung

Analyze and improve existing system architecture of a ruby on rails backend & reactjs frontend to cope with performance peaks, data modelling, extending existing cms, implement and improve api in ruby on rails for frontend. Frontend/Javascript: Security measures & RSA encryption for api calls.

Eingesetzte Qualifikationen

Node.Js, Ruby, JavaScript, React (JavaScript library), Ruby on Rails

Freelance Software Architect, Lead Developer, Team Lead
Sennheiser, Berlin
2/2012 – 4/2017 (5 Jahre, 3 Monate)
High-Tech- und Elektroindustrie
Tätigkeitszeitraum

2/2012 – 4/2017

Tätigkeitsbeschreibung

Software Architect & Lead Developer of main product DB and company website CMS as single-page application:

main company product DB, Retailers & Dealers DB
CMS data structure: multi-client, multi-language, language fallbacks
CMS Frontend Javascript Application: developed CMS JS core, UI components, Javascript editors using jQuery, backbone.js, underscore.js, ember.js templating, further: angular.js. Created customized user interfaces for batch workflows
CMS Backend Ruby on Rails using a DSL for new components
CMS APIs
Frontend company website: Ruby on Rails Application

Develop new javascript ui components for cms frontend, develop user interfaces for cms batch workflows, javascript cms core extensions, data modelling. Frontend website: implement elasticsearch with ruby/rails, analyse and improve search results with Kibana

Eingesetzte Qualifikationen

Software Architecture, Ruby, Ruby on Rails, Team Building

Weitere Projekt‐ & Berufserfahrung anzeigen

Ausbildung

Diplom Informatiker
Diplom
RWTH Aachen
2000
Aachen

Über mich

Working as a Fullstack Software Engineer, Software Architect, Team Lead, Team Coach, Head of Development. As a developer I'm focussed on React Web & React Native apps. Working on freelance basis available for 100% remote positions. Based in Berlin, Germany.

I enjoy to work in agile environments with experts who care about their product and code or intend to build it from scratch. Loving big challenges, clean code and caring about communication. Team builder.

Weitere Kenntnisse

Javascript, Typescript, Node.js, React, React Native, Ruby on Rails

Software Architecture, Data Design, Backend & Frontend Development, Microservices, Cloud, API Design, Single Page Apps, Prototyping, Interdisciplinary Communication, Agile Software Development, Scrum, Kanban, Pair Programming, Code Reviews, Team Lead, Head of Development, Interim CTO.

Persönliche Daten

Sprache
  • Deutsch (Muttersprache)
  • Englisch (Fließend)
Reisebereitschaft
auf Anfrage
Arbeitserlaubnis
  • Europäische Union
Home-Office
bevorzugt
Profilaufrufe
292
Berufserfahrung
27 Jahre und 6 Monate (seit 06/1998)
Projektleitung
6 Jahre

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