Senior Fullstack Developer

Project: ZVFutureNow Industry: Banking

In a large banking group, the payment systems are being completely redeveloped. As part of my subproject, the payment processing is being restructured using stream processing.

• Developed and designed stream processing for cross-border payments based on Kafka and Kafka Streams.
• Developed various input formats for the business department using Drools rules – dynamically adjusting validation rules
• Evaluated and compared various public cloud providers in terms of available databases

Team size: 18 Technologies & Tools: Java 21, Kafka, SpringBoot, Google Cloud, SCDF, Kubernetes, PostgreSQL, Drools, GIT, S3, MongoDB

Project: Development of migration programs in the automotive sector Industry: Leasing

Led the development of migration tools for data migration between multiple systems during the merger of two large leasing companies.

• Technical Product Owner for data migration tickets
• Supported management, domain design and business analysis with questions about domain or technical architecture
• Created data migration architecture for two applications
• Developed and maintained several backend applications and backend tools for data migration using SpringBoot, Kotlin, and Oracle.
• Lead developer for a 12-member development team

Team size: 15 Technologies & Tools: Kotlin, SpringBoot, Oracle, Azure, Kotlin Exposed, Azure DevOps, GIT, JIRA

Project: Colibri Industry: Public Sector

The COLIBRI procedure is a payment system for unemployment benefits with an annual payout of about €15 billion. Currently, COLIBRI is based on a 3-tier architecture (presentation, logic, and data layer) with an underlying CORBA architecture and is programmed in C++. The C++ programming language is to be replaced by Java.

• Used Java EE 7 technologies, especially APIs: EJB, JTA, JAXB, JAX-RS, JPA, CDI, Bean Validation, Interceptors, Managed Beans
• Programmed backend applications, microservices, and REST services
• Used complex build processes (Maven, Git, Stash, Jenkins, …)
• Applied and followed architecture and implementation guidelines
• Applied and followed IT security standards
• Debugged and profiled distributed applications
• Tested, integrated, and documented the migrated software components

Team size: 14 Technologies & Tools: JavaEE 7, EJB, JTA, JAXB, JAX-RS, JPA, CDI, Bean Validation, Interceptors, Managed Beans, Microservices, REST services, Maven, Git, Stash, Jenkins

Project: E-commerce capable backend systems in the automotive sector Industry: Leasing

Setup of a fully digital application process for a leasing company, including integration and connection to marketplaces for this digital application process.

• Maintenance of the digital application process
• Design and development of a leasing and used car offer platform
• Development of various interfaces to external and internal partners
• Frontend development of the leasing configuration flow
• Product Owner for used car leasing

Team size: 15 Technologies & Tools: Kotlin, Kubernetes, Azure, MongoDB (Cosmos), React, NATS, Redis, Camunda, React, Postgres, JIRA, Confluence

Project: Notification component Industry: Shipping logistics

Further development of a notification component.

• Development and maintenance of a notification component for customer emails in a high-load scenario (messaging)
• New development of a push notification component
• Execution of various DevOps tasks, such as setting up CI/CD, code, version, and release management

Team size: 8 Technologies & Tools: Java, OpenShift, Google Firebase, JMS, ActiveMQ, Oracle

Examples:

• Backend for the Onlinemassage booking platform
• ERP for a plumbing company
• Warehouse management system for a moving company

Technologies & Tools: JHipster, Kotlin, Spring Boot, Angular, Keycloak, PostgreSQL

Project: Claims management component Industry: Insurance

Adaptation and further development of a claims management software for handling claims of a motor-vehicle B2B insurer.

• Technical project manager for the client
• Further development and bug fixing
• Responsible for interface development (mainly SOAP, REST)

Team size: 3 Technologies & Tools: Java, Struts, Hibernate, Oracle, BIRT, SOAP

Project: PDF credit report Industry: Credit bureau

Development of PDF credit reports (until then there were only reports in ASCII text format).

• Creating PDF reports using IText
• Development using Test Driven Development (TDD)
• Planning the architecture to extend/develop the application
• Internationalization of the prints
• Designing the PDF reports

Team size: 2 Technologies & Tools: Java, DB2, IText

Project: Analytical campaign management Industry: Non-profit

Built a system for analytical campaign management in a non-profit organization.

• Responsible for software development and architecture of an ROLAP engine for analytical database marketing. Use cases: target group segmentation and response analysis
• Coordinated test management with the client
• Supported the client's target group definition within the ROLAP engine
• Planned the architecture to expand/develop the application
• Developed using test driven development (TDD)

Team size: 6 Technologies & Tools: Java, Struts, Hibernate, AspectJ, Oracle