2017 - now: more Projects

Customer: Yello Strom GmbH via Gerlach, Porst + Steiner GmbH, Cologne

Tasks:

Project 1
Consulting Software Architect & Senior Frontend Engineer (Freelancer)

• Solution design and development of a frontend with Vue.js for a contract managing
  solution
• Solution design and development of a frontend with React/Redux for the yelloshop.de
  Support Center

Project 2
Consulting Software/System Architect (Freelancer)

• Analysing business requirements for coming holistic ecommerce solution across all EnBW
  brands (EnBW, Yello, EN+) for technical implications
• Analysing and prototyping with Spryker, Magento, Shopware, Commercetools with
  regards for suitability of the technical implications of the business requirements
• Design and proof-of-concept of the system architecture solution

2015 - present: developed the idea for the product

Customer:on request
Role: CTO and co-founder

Tasks: 

• developed the idea for the product
• developed a prototype in Ruby on Rails / Node.js (server) and Angular.js in Coffeescript
• re-wrote the software in Elixir/Phoenix (running on the ErlangVM) and React/Redux/ES6
• UX design

2017: Shopgate app

Customer: Shopgate GmbH, Butzbach

Role: Consulting Software Architect & Senior React.js Engineer (Freelancer)

Tasks

• Joined a new formed scrum team which re-wrote the mobile client of the Shopgate app in
  React.js and provided guidance and teaching patterns for developing React.js apps to the
  other developers

2016 - 2017: eCommerce systems

Customer: i22 Digitalagentur GmbH, Bonn
Role: Senior Ruby on Rails Engineer

Tasks:
? maintained and refined the backend of eCommerce systems of the Deutsche Telekom

2007 - 2015:Team leader IT and Development

Customer: mixxt GmbH, Bonn, 
Role: CTO and shareholder, October 2010 - 2015

Tasks:

• Team leader IT and Development
• Lead developer for both of mixxt?s software products (php/javascript/MySQL and Ruby on
  Rails/Coffeescript/MongoDB plus additional services written in Sinatra and Grape)
• Introduced and implemented work flows/processes and tools to enhance the developing
  process
• a mixture of Scrum and XP
• pair programming for non-trivial tasks
• Gitlab and GitlabCI for code hosting and continuous integration
• local development with Vagrant and VirtualBox
• weekly get-togethers to share insights about tools, techniques and processes
• MediaWiki based knowledge base
• MacBooks as the basis for every developer workplace
• Switched from XEN to VMWare ESXi for server virtualization
• Linux server administration (2010 ? 2012)

04/2007 - 09/2010: design and optimization of the in-house 

Role: Software Architect

Tasks: 

• design and optimization of the in-house php framework for multi client enabled, ultra fast
  web applications
• feature design and implementation in php/JS
• MySQL database design and optimization
• UI design
• composed music for webcasts and tutorials

2006: Tutor for the assembler programming course

Customer:Neuroinformatics at Rheinische Friedrich-Wilhelms-Universität, Bonn, 
Role:Student Tutor

Tasks:

• Tutor for the assembler programming course for undergraduates in computer science

2002 - 2006: Developed a Palm OS software 

Customer:Clinical and Applied Psychology at Rheinische Friedrich-Wilhelms-Universität, Bonn, 
Role: Student Assistant

Tasks:

• Developed a Palm OS software (written in C) ?Insomnia Dairy? for clinical therapy
• Computer help desk
• Website design and maintenance
• Assisted composing music used in hypnotherapy

1999 - 2007:  Webdesign and implementation of webpages

Role:Freelancer (for a variety of small businesses)

Tasks:
? Webdesign and implementation of webpages
? IT-Infrastructure setup and maintenance
? Custom Software and Tools