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Hallo,
my name is Christian Gahlert28yo and I am a Freelance Software Developer

About Me

Self-taught and highly motivated software developer with a deep technical knowledge who is searching for an innovative and fast moving tech company.

Education

  • 2014

    Certified Scrum Product Owner training

  • 2013

    Gradle Expert training

  • 2013

    B. Sc. in Business Informatics

    I finished my Bachelors degree in Business Informatics at the DHBW Karlsruhe, Germany in a work-study program after three years.

  • 2012

    Foreign exchange student in the United States

    I completed a semester abroad at California State University, San Marcos, CA. It lasted 5 1/2 months.

  • 2010
  • 2009
  • 2008

    Finished school education

    In 2008 I finished my school education by gaining the German Abitur which qualifies for university admission at the Eduard Spranger Gymnasium, Filderstadt, Germany.

Experiences

ISB AG
since 04/2016
Freelancer
Software Developer Java
  • Worked in a Scrum team working on eGovernment projects for the Ministry of Foreign Affairs (Auswärtiges Amt).
  • Wrote a parser for Selenium IDE tests in order to execute them via Webdriver.
  • Debugged production issues for a legacy applicaton based on an ActiveMQ Network of Brokers with ~200 brokers.
  • Dockerized legacy applications for easier setup of test environments.
  • Implemented customer requirements in a web application based on Apache Wicket, Spring, Apache Camel and Hibernate.
  • Implemented customer requirements in multiple legacy applications based on JDK 1.5, EJB 2.1 and PostgresSQL.
  • Migrated a large Vaadin 6 application to Vaadin 7.
Technologies used: Java (1.5, 1.8), Spring, Docker, PostgresSQL, Gradle, Maven, Ant, Selenium, Webdriver, Apache Camel, ActiveMQ (4 & 5), Windows Server, Debian, Subversion, Eclipse, EJB 2.1, JUnit, Jenkins, Jira, Liquibase
Sophos Technology GmbH
10/2015 - 04/2016
Permanent employee
Software Developer Cloud
  • Worked in a self-organized Scrum team consisting of more than 20 developers. The official team language was English.
  • Developed features and improved test coverage for a distributed Spring MVC application deployed on AWS EC2.
  • Developed features and took part in UX design for an AngularJS application with ES6.
  • Reduced the Spring MVC application’s Gradle based build time by 50%.
  • Trained new team members in Java and JavaScript development.
Technologies used: Java, Spring, Groovy, Bamboo, Jira, Git, Gitflow, Twitter Bootstrap 3, AngularJS, Grunt, Bowser, ES6, REST, SOA, IntelliJ IDEA, OS X, AWS, Docker, MongoDB, Redis, Memcached, HTML5, CSS3, SASS, Gradle, Selenium, JUnit, Karma, JSP, JSON, Ajax
Fiducia IT AG
10/2013 - 09/2015
Permanent employee
Build and Release Engineer
  • Joined a distributed team that just started the transition to Scrum.
  • Installation and administration of Jenkins with more than 30 Buildslaves. Developed multiple plugins to support the build process.
  • Migrated from a large proprietary Build System based on Ant, PHP and Shell to a Gradle based solution. This system is used to compile and build more than 2.600 single modules that form a single banking system.
  • Migrated a legacy web application based on PHP/jQuery/raw SQLs to a Vaadin/Spring/Hibernate based solution. Lead architect and developer for the Vaadin based solution.
  • Technical architecture of the Build Process for the transition to Continuous Deployment.
  • Administration of the company’s central Subversion repositories in a high a vailability environment.
  • Gave trainings and conference talks about the new Build System.
  • Email and phone support for all of the above.
Technologies used: Java, Guice, Spring, Groovy, Jenkins-Plugin-Development, Jira, Gradle-Plugin-Development, Subversion, Vaadin, jQuery, REST, SOA, Eclipse-Plugin-Development, Docker, MySQL, Oracle DB, DB2, HTML5, CSS3, PHP, Shell, Bash, Sonar, Selenium, Spock, JUnit, JSON, Ajax
Private Startup
since 06/2013
Founder
Entrepreneur / Developer
  • Sort of a social network focused on contact exchange. I still struggle to find the right partners to join/support my work.
  • Created a REST-API based on Java/Resteasy/MongoDB with OAuth 2.
  • Experimented to use NodeJS/MongoDB for the API and created a complete working example.
  • Created an AngularJS web application styled with Bootstrap 3 including multiple advanced pages to edit data via the API.
  • Created a native Android Application to synchronize data from the API to the phone book.
  • Automated the build including Jenkins and Gradle (Java, Android, NodeJS, Grunt) with automatic deployment on AWS (continuous deployment).
Technologies used: Java, MongoDB, Resteasy, Jira, Gradle, Git, Github, Twitter Bootstrap 3, Guice, AngularJS, NodeJS, Grunt, Bower, REST, SOA, AWS, HTML5, CSS3, SASS, Android development, JUnit, JSON, Ajax
Fiducia IT AG
09/2010 - 09/2013
Student / Intern
Student (work-study program)
  • Created a mobile payment app for Android as a prototype. Presented and explained the mobile payment process with this prototype at the Fiducia client fair COM13 to bank employees as well as bank managers.
  • Single-handedly designed, created and ran a Vaadin-Touchkit mobile app to rate talks at a conference in 2012. Responsible to maintain and run this app annually since.
  • Lead architect and lead developer in a team of 20 students to create a Vaadin web application to calculate financial models.
Technologies used: Java, Spring, Vaadin, Vaadin-Touchkit, Maven, Subversion, jQuery, REST, MySQL, HTML5, CSS3, PHP, Zend Framework 2, Android development, Vaadin Touchkit, JUnit, JSP, JSON, Ajax
Krumedia GmbH
07/2009 - 07/2010
Permanent employee
Web Developer
  • Created a complete market portal for finding and providing handcraft single-handedly with the help of a designer. (Almost unchanged at www.handwerkerfinden.com)
Technologies used: PHP, jQuery, CSS, HTML, Zend Framework 1, JSON, Ajax
Dassault Systemes
05/2008 - 05/2009
Freelancer
Contractor
  • Created a system to increase CRM data quality semi automatically.
  • Eliminated over 4.900 duplicate customer records.
Technologies used: PHP, MySQL, Visual Basic

Skills

Agile / Scrum
Visualize complex problems and architectures
Explain technical problems to non-technical audience
Test Driven Development
Giving talks and trainings
Software Development
Web Development
Software Architecture
Server Administration
Full Stack Development

Technologies

ActiveMQ
Android development
AngularJS
Ant
Apache Camel
AWS Cloud Services
Bamboo
Bash / Shell
Bower
CSS3
Docker
Eclipse
ES6
Git / Github
Gitflow / Feature branching
Gradle
Groovy
Grunt
Guice
HTML5
IntelliJ IDEA
Java
Jenkins
Jira
jUnit
jQuery
Karma
Linux
Liquibase
Maven
Memcached
MongoDB
MySQL
Netbeans
Nexus
NodeJS
Oracle DB
PhoneGAP/Cordova
PHP
Redis
REST
Resteasy
SASS/LESS
Selenium IDE
Sonar
Spock
Spring
Subversion
Twitter Bootstrap 2 & 3
Vaadin
Vaadin Touchkit
Webdriver
Zend Framework 1 & 2
 
User
Professional
Expert

Languages

German
English
French