Ronny Karallus

Technical E-Commerce Consultant

Experience, competence, reliability, motivation, ...

... are values successful software projects are based on. Having worked for more than a decade as a consultant, I count those properties among my strengths. They are arguments why I am a good match for your team or why I can lead your project to success. You can find even more scrolling down on this page.


Technical E-Commerce Consultant


December 2017 - Today

Senior Software Engineer

International Marketplace Startup

February 2017 - November 2017

Principal Software Engineer

MisterSpex GmbH

August 2016 - January 2017

Freelancing Software Developer


January 2013 - July 2016

Senior Consultant

Intershop Communications AG

August 2004 - December 2012


University of Bamberg, Germany

Master of Science
Information Systems

Grade: very good with distinction

2009 - 2017

Univeristy of applied sciences Mittweida, Germany

Diplom-Informatiker (FH)
Applied Computer Science

Grade: good

2000 - 2005


E-Commerce technologies
  • Intershop Enfinity Suite 6 (6.0 - 6.7)
  • Intershop 7 (7.0 - 7.9)
  • Apache Solr
  • Apache Lucene
Programming Languages
  • Java
  • JavaScript
  • Perl
  • PHP
  • Shell Scripting
Java Technologies
  • JavaEE
  • JSP
  • ISML
  • Spring
  • Apache Tomcat
Web Technologies
  • HTML 5
  • CSS 3
  • JavaScript
  • Apache Webserver
  • Nginx
JavaScript Technologies
  • JQuery
  • Angular
  • Knockout.js
  • Ionic
Database Technologies
  • Oracle DB
  • PostgreSQL
  • SQL
  • Neo4j
  • Cypher
  • IBM Cloudant
  • JUnit
  • Selenium
  • CasperJS
  • Geb + Spock
  • Apache JMeter
  • VMWare Workstation
  • Oracle Virtualbox
  • Docker
  • Vagrant
  • Packer
  • Kubernetes
Domain Knowledge
  • E-Commerce
  • Search
  • Big Data
  • Software Architecture
  • Application Integration (SOA)
Version Control
  • SVN
  • GIT
  • Rational Synergy
  • Gradle
  • Maven
  • Ant
  • Webpack
Software Development Process
  • OOAD
  • Kanban
  • UML
  • Atlassian JIRA
  • Atlassian Confluence
  • Netbeans
  • Eclipse
  • Intershop Studio
  • IntelliJ IDEA
  • IntelliJ Webstorm
Cloud Technologies
  • AWS (S3, Route53)
  • Azure (Blob Storage)
  • IBM Cloud (Watson Services, Cloudant, Kubernetes)
Continuous integration
  • Hudson / Jenkins
  • Atlassian Bamboo


Software development and successful software projects are my passion. I enjoy to expand my horizon in new projects and with new challenges. My manifold experiences are a great help and at the same time an enrichment for a lot of projects. Find my portfolio below and get an idea how your project can benefit from my participation. If you are interested in my technical expertise, please refer to the navigation item skills.

Software development

After more than a decade in different software projects I can draw upon comprehensive experiences. I am counting technically mature architectures, re-usable and extendable software as well as good maintainability among the main principles in a successfully software project. Besides the source code itself especially tests and documentation are the important deliverables. To get an idea how I can support your project technically, please have a look onto the page skills, which contains an overview on my technical skills.

Architecture / Technical Lead

Based on my long term experience as consultant I have a broad knowledge on technologies, processed and projects. This helps to lead developers and developer teams into the right direction and make the right decisions in project situations. Reviews for specifications, processes or source code are as much a part of this role as the technical coordination of the project teams. Working in global teams with distributed and foreign language developers is also not a problem based on my longtime international project experience.

Training / Coaching

Is your project team lacking some experience in one of the areas I am specialized in and an important implementation project is getting close? I can support you with trainings for dedicated topics. In cases where the topics that require assistance are not known in advance an interesting approach is training and coaching from within the team. I am happy to work together with your team in the daily implementation phase and support with particularly tailored trainings in areas where demand is identified. Also interesting are 1on1 session in the tradition of pair-programming. Experience shows that lasting results can be achieved this way.

Build Engineering / DevOps

A consistent process for source code compilation is as essential for a project as a process for automated and reliable deployment. The responsibilities of a build engineer are on management of the VCS, the build server and the build scripts themselves. In projects where virtual machines are used for development the build engineer may also be responsible for their creation and maintenance. Often also performing or supporting the deployment on test and production environments is within the realm of this role. I can provide support in this area because of my good understanding of processes, tools and system infrastructure. Especially in the ramp-up phase of a project the usage of external resources can be useful to implement a reliable infrastructure including good documentation.

Quality assurance

One of the most important tasks in a software project is a comprehensive and reliable quality assurance. Besides manual functional tests also automatic functional tests, performance tests an analysis are counted among the tasks in this area. I can be a profit for your project in the mentioned areas. Performance test, analysis and optimization in combination with automatic system tests are my special strengths. An additional focus of a successful project should also be on a good problem management. The tasks include communication with the QA team, the pre-processing of QA tickets and the assignment of the tasks to the correct developer as well as qualified escalations of problems to vendors. Those factors can have a direct impact on a fast and successful QA phase. I am looking forward to make your project benefit from my experience in this area.

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Ronny Karallus
Wilhelmsaue 30
10713 Berlin
(+49) 176 80109281
Tax-ID: DE287071236