Professioneller Problemlöser/Entwickler

9/2011 – offen

Scientist at the Hans-Ertel-Zentrum (http://www.dwd.de/ertel-zentrum ) in the OASE Team. Research in Clustering and Tracking in high resolution 3D radar composite data. Introduction of GIT and Redmine to the Institute, connected with teaching activities in that areas.
(Polarimetric radar, C++, Templates, NetCDF, HDF5, TBB, Boost, FLANN, Visualization. Redmine, GIT)

12/2010 – 4/2012

Support with the concept and implementation, mainly of the client-side components of the www.contentconverter.de - Plattform of the Deutsche Post AG (via GFT). Using Javascript with Treesaver for rendering news and magazine content through templates and styles completely on the client in HTML5/CSS3. The tool is mainly targeted at iOS and Android smartphones. Development of native application components in iOS and Android. Content providing and exchange using CouchDB and MobileCouchbase. Technical Lead Role (5 Developers).

(HTML5, ExtJS / Sencha-Touch, WebKit, Treesaver, iOS, Android. CouchDB, Mobile Couchbase, Objective-C, C++, Java, Javascript, Python)

3/2010 – 11/2011

Suite of Apps covering various areas of content provided by the established german publishing house DuMont. Modular Application-Development, Apps are fully configurable from modules through JSON files. Release of the first 6 Applications is planned for August 2010.

(iPhone SDK 4.0, Objective-C, JSON over HTTP, In-App – Purchase, Subversion)

Recipe application for the german food producer Knorr. Voluminous app with unusual navigation elements and Core-Data backend. Search functions. Responds to orientation to provide a different look on recipe details. Complicated CI integration.

(iPhone SDK 4.0, Objective-C, CoreGraphics, CoreData, JSON, Subversion)


Jacobs Photo-Freezer. Application for image manipulation (icing over by blowing into the microphone and rubbing off with the fingers) for a marketing campaign. Released to AppStore.

(iPhone SDK 3.2, Objective-C, CoreGraphics, Facebook-Integration, Subversion)

3/2008 – 4/2009

Application for the managament of nation-wide advertisement campaigns for a big german mobile phone carrier.Campaigns are supported at all stages from conception (including web-based sketch tools) to content management (image database, text databases, corporate identity guidelines, etc) to communication between advertisement partners, printers, radio stations and newspapers. Highly complex applicationlandscape with web services, indexing servers, Adobe Flash, Web2.0 features and WebObjects applications. Apple WebObjects, Webservices, XML, SolR und Lucene Indexing, Java, Javascript, Java Applets, Ajax, FTP, Subversion und Trac.

Large scale refactoring and extension of WebObjects applications in an E-Training context. Migration of a complex live Oracle database to MySQL. Apple WebObjects, Single-Sign-On. Oracle, MySQL, Java, Subversion, Trac.

9/2007 – 9/2007

Refactoring of a set of applications and loose source codes for processing of meteorological precipitation radars into a coherent library and set of applications. Extension of the library by routines for reading newer formats, like HDF5 and Radolan (DWD) files. Integration into the operational procedures.C, C++, Eclipse CDT, Proj4, GeoTIFF, Subversion.

5/2006 – 5/2006

Troubleshooting problems with webservices in an SOA context for an mCommerce application. Special help with SOAP protocol and Apache Axis. Java, Apache Axis, SOAP, SOA.

7/2005 – 2/2008

Management Information System for a big german private equity company. Complex business logic for observing markets and information gathering from various sources, including MS-Access databases and external sources. Data Mining. Controlling Modules. Fund management. Reporting tools for aiding with the reporting to the companies investors, including automated document generation, integration of Microsoft Office products and investor specific web applications. Extensive use of Direct2Web. Agile Development. Project documentation with Wiki. WebObjects, OpenBase, MS Access + Excel, MySQL, Java, XML, Subversion, POI, Jasper Reporting, Business Objects (Crystal Reports).

5/2005 – offen

iPhone Application ‘TrinkCheck’ allows people to track their water intake and makes recommendations based on changing daily conditions. Localized in German and English language. The applications was created by us and later sold to Gerolsteiner.

iPhone SDK 3.0 – 3.1, Objective-C, SVN, Mingle, Trac.


Android Version of TrinkCheck-App (released in Google PlayStore). First version is in the app-store and an update is currently underway.

Android SDK 3.x – 4.x. Cross-Version technology. Java. Git. SVN. Trac.


iPhone Application “Bellyaches” designed to help people to link symptoms to ingested food. Aimed to assist people suffering from food tolerance issues (like lactose- or fructose malabsorption , gluten allergy, chronic colitis etc.), helping them in finding out which type of food they tolerate and which not. Released January 2010.

iPhone SDK 3.0 – 3.1, Objective-C, SVN, Trac.


Conceptual planning and implementation of a set of applications on different platforms. The Goal is assimilation and display of weather radar information by the European Radar Association. Cross-platform development in parallel for Java and C based Clients. Functionality encapsulated in Libraries for each language.

Visualization of raw radar information in GIS contexts using OpenGIS Mapservers and OpenCV graphics library. Implementation of the customer internet portal in Java WebObjects. REST server for customer profile information.

Implementation of the C-Library. Implementation of the iPhone Application, including CoreLocation features and Push Messages. Backend Connection using REST.

Further clients are planned for RIM, JavaFX and Android.

iPhone SDK 2.0 – 3.1, Objective-C, C, C++, CMake, Xcode, Java, Eclipse, PostGIS, OpenGIS, OpenCV, uDig, Mingle, XML, REST, WebObjects.

6/2004 – 11/2004

Design and Implementation of an online platform for Spellforce2. Web application for player registration, stats, game infos, Forums etc. Connection of game clients using webservices and tcp/ip for game matchmaking and in-game chat. Backend application with JMS and C++ tcp/ip server. Java, Visual C++, MySQL, WebObjects, Axis, JBoss and JBossMQ, gSoap, OpenSSL, Perforce, Doxgen,Wiki.

5/1999 – 3/2004

Design and implementation of a TCP/IP server in Java for provisioning of mobile phones in connection with T-Mobile’s SAT-Server project. High availability integration. High performance design using .nio classes. Java, TCP/IP, CORBA, Oracle, SunCluster 2.0.

Proposal, installation and administration of a Wiki for improving communication between the development team, test department and the live system administration team. Twiki, Apache

Development of the B2B interface for T-Mobile’s SAT – Server. Web services. High availability cluster integration. C++, Java, SOAP, RMI, CORBA, SunCluster 2.0, Apache Tomcat.

Design and development of a tool for managing Oracle PL/SQL database triggers with associated java code running in the database. Graphical user interface. Dynamic code generation from templates. Integration with unix processes. Oracle, Java, PL/SQL, Java Stored Procedures, Swing.

WebObjects prototype of a customer application for managing dynamically allocated MSISDN numbers. Configuration of time schedules, user groups, availability etc. Java, WebObjects, Oracle, Solaris.

Development of C++ modules for T-Mobile’s SAT server. Configuration, Core-Engine, SMS encoding. Performance and stability tests. Deployment procedures. Help with the refactoring of the core engine in design and implementation. Connectivity with SMSC. CORBA interface for third party access. High availability integration. C++, Oracle, RogueWave, XML, yacc/lexx. EMI - Protokoll (SMSC), CORBA, SunCluster 2.0.

B2B integration for the third party interface (http) to T-Mobile’s SAT server. Graphical test applications (desktop and applet). HTTP, OTA, AIO, Java, Swing/AWT.

Design and implementation of a strategy game for the WAP market. WebObjects application for customer access and WAP generation (WapObjects). WebObjects, Java, WAP/WML. Oracle.

Test of WAP enabled mobile devices of various vendors with regard to usability, standard-compatibility and security. Evaluation under aspects of a planned set of mCommerce applications.

Development of a WAP application prototype (mCommerce). Presented with great success at Cebit 1999. WML, Ericsson's Jaffa Framework, RMI, Java, Oracle.

Evaluation of several different CORBA orbs on Solaris 8. Aspects of interoperability, performance and integration. Oracle. RogueWave DBTools+, Visibroker, TAO, Mico, Omniorb. Java and C++.

Conception and development of an installation manager for distributed systems on high availability clusters on Solaris. Installation of software packages and provisioning of databases. Tcl/TK, Shellscript, Package-Manager and Oracle.

Development of an internal project management tool. MS-Access and Visual Basic.