Dirk Kirsten

Konstanz, Baden-Württemberg, Germany

Member since August 3, 2013

Dirk engineers data-driven applications with a proven ability to develop efficient and scalable solutions on time and on budget. He has extensive experience and interest in building applications using modern web technologies.

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Portfolio

BaseX GmbH
XML, JavaScript
University of Constance
Shell Scripting
IBM
JavaScript, Java

Experience

JavaScript, 6 years
RESTXQ, 5 years
XQuery, 5 years
AngularJS, 3 years
Functional Programming, 3 years
Java, 2 years
Express.js, 1 year
Node.js, 1 year

Availability

Part-time

Preferred Environment

Linux, IntelliJ IDEA/Webstorm, Vim, Git

The most amazing...

...thing I've implemented is a matrix factorization algorithm for recommender systems with a low RMSE.

Employment

Software Engineer
BaseX GmbH
2012 - PRESENT
- Led full-stack development tasks for a SPA with AngularJS. Responsible for all client-side code, unit tests, and end-to-end tests.
- Planned, architected, and implemented an application and reviewing platform using OData, XForms, BetterForms, RestXQ, and XQuery.
- Developed a plugin for TinyMCE to support image addition from a third-party application using JavaScript.
- Planned and implemented a code sharing solution for XML and XQuery using AngularJS, RestXQ and XQuery.
- Created an AngularJS application for a nomination and application process.
Technologies: XML, JavaScript
Research and Teaching Assistant
University of Constance
2010 - 2012
- Assisted for the "Introduction to computer systems" course.
- Set up a mobile ad-hoc network using a Universal Software Radio Peripheral.
- Created back-end support and administration scripts for test set-ups of mobile networks.
- Conducted security research on the cryptography of GSM.
- Conducted initial research, configuration, and setup of a web archiving solution using the Wayback Machine.
Technologies: Shell Scripting
Software Engineer
IBM
2007 - 2010
- Developed e-learning modules for Lotus Notes using JavaScript.
- Implemented prototypes of a web 2.0 style banking solution using ICEfaces, Java, Servlets, and Spring.
- Exploited Distributed RAM for parallel joins on MapReduce using Hadoop.
- Implemented HiperSockets as a data link layer for the Reliable Datagram Sockets protocol as a Linux kernel module for System z.
- Responsible for network performance measurement between virtual machines on System z for various datagram and streaming protocols using Linux on System z.
Technologies: JavaScript, Java

Experience

Rights Management Tool (Development)
For a large publishing house, I planned and developed a rights management solution to reduce costs for acquiring reproduction rights. It is a complex single-page application built on AngularJS.
BaseX (Development)
http://basex.org
BaseX is an XML database and XQuery 3.0 processor implemented in Java. I am a core developer and do testing and bug fixing for the BaseX core product. I develop a replicated and distributed version of BaseX for improved performance and fault-tolerance. I also added modular functionality, e.g., a random module or a templating system based on Mustache.
Lindau Nobel Laureate Meetings (Development)
http://www.lindau-nobel.org/
I architected and implemented a solution called NAPERS for the application and reviewing process of young researchers for the Lindau Nobel Laureate Meetings. It uses an external data storage, which we connect to using OData. The platform itself is programmed in XQuery using RestXQ; the client-side is done using AngularJS (JavaScript). I did the implementation, testing (JUnit, Selenium), and architecture of the system.
OpenAtrium (Development)
https://studieren-ohne-grenzen.org/atrium/
This project is an internal communication platform (including a wiki, shoutboxes, forum, polls, task management, calendar, ...) based on OpenAtrium (PHP5, MySQL, LAMP), and is implemented for a German Non-Profit-Organization called Studieren Ohne Grenzen (Studying Without Borders). I set up and enhanced the platform and migrated content from an older legacy solution. I also enhanced the login functionality to work with proprietary pre-existing user profiles.

Skills

Languages
XPath, JavaScript, XQuery, XML, SQL, Java, C, Python, C++
Frameworks
AngularJS, Express.js
Libraries/APIs
RESTXQ, Node.js, jQuery
Paradigms
Functional Programming, Scrum, Concurrent Programming
Storage
BaseX, MongoDB, IBM - DB2, MariaDB, CouchDB
Tools
Vim Text Editor, IntelliJ, Eclipse, Mongoose
Platforms
Linux
Misc
Node.js Server

Education

Master's degree in Information Engineering
University of Constance - Konstanz, Germany
2010 - 2014
Bachelor's degree in Applied Computer Science
University of Cooperative Education Stuttgart - Stuttgart, Germany
2007 - 2010

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