Senior Java Developer

4/2018 – 6/2024

Project to develop a payment authorization system for a business travel credit card provider. The solution was implemented using Java and Spring Boot microservices deployed on Azure cloud. The developed components functioned as a mediation layer between different applications (TSYS PRIME, SAP, CRM software) using Kafka messaging and REST APIs. This was part of a major IT transformation project following the Agile / Scrum process with 2-week sprints. I participated in all stages from proof of concept until going live. The work involved creation and refinement of user stories, solution design and development and support of the production system.
Technologies: Java 8, Spring Boot, REST, JPA / Hibernate, Kafka / Streams, Azure cloud, Kubernetes, Docker, Maven, Git, Jenkins, JUnit, Gerkin/Cucumber, MS SQL Server

Java (allg.)

7/2017 – 3/2018

Project to develop a new payment gateway service for the German Railways ticket booking systems. The solution was implemented using Java and Spring Boot REST microservices deployed on AWS cloud and supported various payment methods (credit card, PayPal, Sofort Bank transfer). This was a greenfield project following the Scrum process and 2-week sprints. I participated in the initial design and development phase and was also responsible for the supervision of junior developers.
Technologies: Java 8, Spring Boot, REST, Swagger, JPA / Hibernate, JUnit, Cucumber, Maven, Git, Vagrant, Docker, Jenkins, AWS, OpenShift

Java (allg.)

12/2016 – 6/2017

Project for the Norwegian Public Roads Administration (Statens Vegvesen) to develop a new web-based vehicle registration application to replace legacy systems. Development was across the full stack (front and back end) with strong emphasis on unit / integration testing. Used the Scrum process and 3-week sprints.
Technologies: Java 8, Spring, JUnit, JSP, HTML, Maven, Git, Oracle, Vagrant, Docker.

Java (allg.)