Dirk is available for hire
Hire DirkDirk Kirsten
Verified Expert in Engineering
Software Developer
Konstanz, Baden-Württemberg, Germany
Toptal member since September 23, 2013
Bio
Dirk engineers data-driven applications with a proven ability to develop efficient and scalable solutions on time and within budget. He has extensive experience and interest in building applications using modern web technologies and is interested mainly in building everything from front-to-back.
Portfolio
FORCAM GmbH
Java, Spring, Hibernate, Vaadin, Vue, JavaScript, REST
Senacor Technologies
Java, REST, GWT, Spring, Hibernate, SQL
BaseX GmbH
JavaScript, XML, RESTXQ, SOAP, XQuery
Experience
Availability
Part-time
Preferred Environment
Git, IntelliJ IDEA, Linux, Vue, Java, JavaScript, TypeScript, Flutter, Dart, BaseX
The most amazing...
...thing I've implemented is a matrix factorization algorithm for recommender systems with a low RMSE.
Work Experience
Senior Software Engineer
2020 - PRESENT
FORCAM GmbH
- Developed solutions around a leading IIoT (Industrial Internet of Things) platform.
- Specialized in cloud infrastructure and helped in delivering an outstanding cloud experience for our customers.
- Delivered full-stack applications using Spring, Hibernate, Vaadin, and modern testing technologies.
- Deployed applications using Docker, Kubernetes, and Helm.
Technologies: Java, Spring, Hibernate, Vaadin, Vue, JavaScript, REST
Senior Developer
2017 - 2019
Senacor Technologies
- Developed solutions for our customers, usually sizeable German banking institutions.
- Architected and developed solutions on the client and server-side, including full-stack, using Spring, Hibernate, JavaFX, and GWT.
- Supported and assisted the customer in realizing their needs and building architectures fitting their requirements.
Technologies: Java, REST, GWT, Spring, Hibernate, SQL
Software Engineer
2012 - 2017
BaseX GmbH
- 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: JavaScript, XML, RESTXQ, SOAP, XQuery
Research and Teaching Assistant
2010 - 2012
University of Konstanz
- Assisted in the "Introduction to Computer Systems" course.
- Set up a mobile ad-hoc network using a universal software radio peripheral (USRP).
- Created back-end support and administration scripts for test setups of mobile networks.
- Conducted security research on the cryptography of GSM.
- Conducted initial research, configuration, and set up of a web archiving solution using the Wayback Machine.
Technologies: Shell Scripting, JavaScript, Python
Software Engineer
2007 - 2010
IBM
- Developed e-learning modules for Lotus Notes using JavaScript.
- Implemented web 2.0 style banking solution prototypes 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 Socket (RDS) protocol as a Linux kernel module for System Z.
- Worked on network performance measurement between virtual machines on System Z for various datagram and streaming protocols using Linux on System Z.
Technologies: Java, JavaScript, Vim Text Editor, Linux
Experience
Rights Management Tool
I planned and developed a rights management solution for a large publishing house to reduce costs for acquiring reproduction rights and managing licenses. It is a complex single-page application built on AngularJS.
BaseX
http://basex.orgBaseX is an XML database and XQuery 3.0 processor implemented in Java.
Acted as a core developer and performed testing and bug fixing for the BaseX core product. I developed a replicated and distributed version of BaseX for improved performance and fault tolerance. I also added modular functionality, like a random module or a templating system based on Mustache.
Acted as a core developer and performed testing and bug fixing for the BaseX core product. I developed a replicated and distributed version of BaseX for improved performance and fault tolerance. I also added modular functionality, like a random module or a templating system based on Mustache.
Lindau Nobel Laureate Meetings
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 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.
It uses 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
This project is an internal communication platform, including a wiki, shoutboxes, forum, polls, task management, and calendar, based on OpenAtrium (PHP5, MySQL, LAMP). It 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 improved the login functionality to work with proprietary pre-existing user profiles.
Education
2010 - 2014
Master's Degree in Information Engineering
University of Constance - Konstanz, Germany
2007 - 2010
Bachelor's Degree in Applied Computer Science
University of Cooperative Education Stuttgart - Stuttgart, Germany
Certifications
FEBRUARY 2010 - PRESENT
LPIC-1
Linux Professional Institute
Skills
Libraries/APIs
RESTXQ, Vue, Node.js, jQuery
Tools
IntelliJ IDEA, Vim Text Editor, WebStorm, Git, Mongoose
Languages
JavaScript, XPath, XQuery, SQL, XML, Java, TypeScript, Dart, C++, C, Python, PHP
Frameworks
AngularJS, Spring, Hibernate, Vaadin, Flutter, Express.js, GWT
Paradigms
Functional Programming, Scrum, Concurrent Programming, REST
Storage
BaseX, MongoDB, MariaDB, IBM Db2, CouchDB
Platforms
Linux
Other
Shell Scripting, SOAP
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