Software development for efficient authorization processing and statement generation

Technologies: Java 21, Mastercard, Docker, Ansible, MongoDB, Azure Cloud Services, Kafka, Security, Linux

• Client: Large international payment institution
• Period: 2024-2025
• Mission: IT Consulting, Backend development, DevOps, Corporate Payment

Development and architecture of cloud and on-premise microservices - credit card authorizations

Technologies: Java 17, Spring Boot 3, TCP, GICC, UATP, Kubernetes, Docker, Kafka, MongoDB, Azure Cloud, PCI DSS, Jira/Confluence, Jenkins, Scrum, SAFe, nginx, Linux, HAProxy

• Client: Large international business travel payment provider
• Period: 2022 - 2023
• Mission: IT Consulting, Backend development, Cloud DevOps

Development of Microservices for order management, handling of online reservations, availability updates.

Technologies: Java 11, Kotlin, Spring Boot, Kubernetes, Docker, Google Cloud Platform, Grafana, PostgreSQL, MongoDB, Kafka, Maven, REST, OpenAPI, Interface to IBM Sterling

• Client: Multinational e-commerce company focusing on consumer electronics
• Period: 2020 - 2021
• Mission: IT Consulting, Design and development of backend microservices, Cloud DevOps

Development of a microservice for machine learning based optimization of the portal. Further development of the recommendation engine and the content management system.

Technologies: Python, Java, Spring, Quarkus, Machine Learning, Kubernetes, Docker, Helm, Kafka, MySQL, AWS Cloud, Spark, Druid, Elastic Search, Superset, Grafana

• Client: Large German digital publishing house
• Period: 2019 - 2020
• Mission: IT Consulting, Backend Development, Cloud DevOps

Development and architecture of cloud microservices

Technologies: Java 8, Spring Boot 2, Kubernetes, Docker, Kafka, MongoDB, CosmosDB, MS SQL, Azure Cloud, Hibernate, SAP CC Interface, MS Dynamics CRM Interface, Papyrus Interface, PCI DSS, Jira/Confluence, Jenkins, Scrum, SAFe, nginx

• Client: Large international business travel payment provider
• Period: 2018 - 2019
• Mission: IT Consulting, Backend development, Cloud DevOps

Development of a cloud native fulfillment platform.

Technologies: Java 8, Spring Boot, Microservices, Kubernetes, Google Cloud Platform, Docker, Kafka, Maven, MySQL, Jira/Confluence, Linux, Prometheus, Grafana

• Client: Large German food retailer
• Period: 2017 - 2018
• Mission: IT Consulting, Backend development, Cloud DevOps

Development and prototyping of data analysis and machine learning tools for fraud prevention in e-commerce

Technologies: Java 8, Machine Learning, KNIME, Maven, PostgreSQL, JavaFX

• Client: Credit Information Agency
• Period: 2017
• Mission: Backend development, Data Analysis

Further development of contract and claims management rich client software and a test framework.

Technologies: Java 7, DB2, OSGi, Jenkins, SWT, Eclipse

• Client: International insurance corporation
• Period: 2016 - 2017
• Mission: IT Consulting, Backend development