getting code done.

Worked on a Database system in Java based on Hadoop (Apache HBase + Apache Spark), mainly in external Tables (Parquet) performance optimizations, implementing MERGE INTO SQL Feature, benchmarks, improving code quality and test coverage. Improved, refactored the ODBC Driver (C++, CMake).

Project Lead for an international team working on import/export from/to BigData file formats and file storages in a distributed database system written in C++. Supervising 4-6 students / year researching new algorithms and technologies in this area.

Software Engineer for SAP HANA Vora. Mainly C++ Coding, TDD.Developing efficient readers for BigData File Formats (Parquet, ORC, CSV), BigData File Systems (HDFS, MapR-FS, S3, ...).

Improving tools for simulation (of partial differential equations) in research & development. C++, numeric simulations, algebraic multigrid, MPI, cluster programming. Some small Java programms and BASH helper scripts.

Studying parallel adaptive algebraic multigrid methods.

Improving tools for simulation (of partial differential equations) in research & development. This included coding and running parallel programs in C++/MPI which ran on germanys biggest clusters. My task is designing the linear algebra and parallel algebraic multigrid. For this I did a lot of speed optimization, also in CUDA and OpenCL. For data analysis and debugging I also wrote a couple of programs in Java, as well as Eclipse and Netbeans plugins for code assistance of our LUA extensions.

Created software for documentation and reduction of fertilizers on mobile devices with GPS (Palm OS, Windows CE/Windows Mobile, iOS, all C++/Objective-C), software for synchronization of mobile databases with webservers, server software for the calculation of infestation maps.