Climate Project Backer

• Apr 2023 - Present

Senior Developer

• Nov 2018 - Present

Freenlancer / Consultant

• Jul 2009 - Present

▪Event management app for managing the monitors at the entrance advertising all upcoming events for the next week ▪Shift management backend and App for all employees that is able to plan a day from 0600 until 0600 the next day, so the night club can actually plan ONE workday instead of two like all other available software enforces ▪Flea market management system to relieve everyone from Excel lists, calls and random notes ▪Event management app for managing the monitors at the entrance advertising all upcoming events for the next week ▪Shift management backend and App for all employees that is able to plan a day from 0600 until 0600 the next day, so the night club can actually plan ONE workday instead of two like all other available software enforces ▪Flea market management system to relieve everyone from Excel lists, calls and random notes

Senior Developer

• Nov 2017 - Oct 2018

See VFK AG See VFK AG

Senior Developer

• Jun 2016 - Oct 2018

As a spin-off from Fraunhofer, this company had the ambition to invent a market place for the shopfloor with a unified massaging protocol and a messaging bus architecture responsible for connecting any edge device on the shopfloor with the corporate cloud. ▪ Head of development ▪ Responsible for the infrastructure, website, administration backend, community features like a forum, messenger, marketplace and the service lifecycle ▪ multiple POCs with big companies ▪ Apps for demonstrating the workflow inside the company and for suppliers Show less

Freelancer

• Apr 2017 - Aug 2017

Development of an app to be shown off in one of their exhibitions. I was given a PDF with some UI designs and implemented the whole app from scratch including UI testing and feasibility checks for the neatly crafted UI designs regarding real world inputs. Development of an app to be shown off in one of their exhibitions. I was given a PDF with some UI designs and implemented the whole app from scratch including UI testing and feasibility checks for the neatly crafted UI designs regarding real world inputs.

Senior Developer

• Aug 2014 - May 2016

▪ Head of Web Development. ▪ Leading a Team of up to 4 people for the frontend ▪ Conception and implementation of the full backend ▪ Implementation of APIs for printing providers and PayPal including tax calculation and the creation of invoices as multi page PDF ▪ Connection of external print service providers ▪ Shop system with connection to PayPal ▪ Automatic deployment through Travis/Fabric/Ansible automatically updating all running instances in AWS ▪ Database versioning using Django migrations ▪ Custom tools for monthly billing of ubimake (tax reports) Show less

CTO

• Nov 2009 - Aug 2014

▪ Conception and development of the new national platform ▪ Stackchange from PHP to Python ▪ Merge of 28 databases of old, regional applications ▪ APIs to various external ticket partners (comparison of events) ▪ Payment system and reminders for internal shops as well as white label solutions of our products for external partners ▪ Sophisticated raffle algorithm to evenly provide all members with free tickets, taking into account their tastes and selected regions ▪ Automation of deployment on distributed systems with factory ▪ Database versioning with the help of South to develop individual features independently of each other and to be able to deploy them in any order without difficulty Show less

Systementwickler

• Apr 2005 - Oct 2009

Conception and development of the visitor management software for the German Bundestag as a web application including supervision, training and further development of additional features for several years. Process analysis and development of new modules / application areas. ▪ A specially written Constraint solver for resource management and temporary blocking of properties for parallel booking requests ▪ Attachment management (see diploma thesis) ▪ Document management system for dynamic generation and subsequent live editing function (Visite had a page break preview before such a feature was found in Google Docs) cover lettering and automatic mail and fax to MdB and visitors ▪ Diploma thesis: Dynamic rule management - implementation of a POC for the visitor management system Visite of the German Bundestag (1,3) Show less

Web-Entwickler

• Sep 2004 - Oct 2004

Conception and development of a new web shop based on Java and a Java OO database. Conception and development of a new web shop based on Java and a Java OO database.