Robert Skarwecki

Professional Summary

Highly qualified and experienced Senior Software Developer with over 16 years of experience in designing, developing, and maintaining complex software solutions. Expert in Java, with a strong background in backend development. Proven track record in conducting code reviews and ensuring adherence to clean code principles. Passionate about continuous education and staying updated with the latest technological advancements.

Technical Skills

• Operating Systems: UNIX variants (MacOS, Linux, Solaris), Windows
• Programming Languages: Java, C#, C++, C, Golang, Python
• Development Tools:
  • Java IDE: IntelliJ IDEA, Eclipse
  • Java Toolstack: Maven, Ant
  • Java ORM: Hibernate 3, Cayenne 2, JPA
  • Java XML Frameworks: JDOM, JAXB, JPA, Xstream, Xerces, JAXP, Xalan, JAXP
  • Native APIs from Java: JNA, JNR-FFI
  • Spring Framework, Spring Boot
  • Quarkus
  • Parser Generator: ANTLR
  • Installer Generator: Install4j
  • Unit Tests: jUnit, Mockito, BDDMockito, Moq, NUnit
  • GNU Toolstack: Make, Autoconf
  • Microsoft Toolstack: Visual Studio 2017, Team Foundation Server
  • Rational Tools: ClearCase, ClearQuest
  • Web Servers: Apache Tomcat 7, Apache HTTPD
  • Oracle SQL Developer
  • Dependency Injection: Spring, Guice, Castle, Unity
• Software Versioning: Git, Subversion
• Databases: Oracle, DB2, MySQL, PostgreSQL
• Tools & Platforms: ArgoCD, Docker, Helm, Kubernetes, Jenkins
• Cloud Services: AWS, Azure
• Software Development Methods: Agile, Scrum, DevOps

Product Knowledge

• Groupware/Office Communication: Microsoft Office, OpenOffice, LibreOffice, Apple Pages
• Application and Web Servers: Apache HTTP Server 1.3-2.0, Apache Tomcat 4-7, IMB HTTP Server, IBM WebSphere Portal Server, JBoss Application Server, IBM WebSphere Application Server 4.0-6.0, SAP AS 7.20 CE (NetWeaver)
• Provisioning: Sun N1 SPS 5.0-5.2
• Others: BIND 8/9, Samba 2.2, Squid 2.3/2.4, Electronic Health Card, Gematik, NeuroTechnology Biometric SDK, INTERPOL MIND, Cognitec FaceVACS

Education

Diploma in Computer Science (University of Applied Sciences)

University of Applied Sciences Heilbronn

Period: 09/2000 – 09/2024

Thesis Topic:Design and Development of a Generic Tool for Developing Domain-Specific Languages and Prototyping Language Extensions

Projects

02/2025-present - Digitization of Banking Processes

• Description: Three interlocking business processes for real estate valuation in a state bank need to be digitized. The BPMN and DMN diagrams provided by the department are prepared for execution in Camunda and the Service Tasks are implemented. Assert data is read from third-party systems, including SAP R/3, and updates are made there. The correctness of the implementation is ensured using Given-When-Then tests.
• Technologies used:Camunda 7.20, OpenAPI 3.3, Java 18, ArgoCD, GH Actions, github, Kafka, IDEA intelliJ 2023.2.5 Ultimate, Docker 4.24.0, Kubernetes 1.27.2, Helm
• Client:Nord/LB
• Activities:
  • Definition of ServiceTasks based on BPMN
  • Implementation of ServiceTasks based on descriptions in Jira tickets
  • Covering the functionality of ServiceTasks using unit tests
  • Connection of third-party systems like SAP using OpenAPI

01/2025 - Support for Kafka Migration

• Description:Customer applications need to be migrated from Kafka on-prem to Kafka in the cloud. This required adjustments to the implementation of microservices and their configuration to switch from password-based authentication to mutual TLS.
• Technologies used:Java 18, ArgoCD, GH Actions, github, Kafka, IDEA intelliJ 2023.2.5 Ultimate, Docker 4.24.0, Kubernetes 1.27.2, Helm
• Client:Nord/LB
• Activities:
  • Replacement of manual consumer and producer configurations with Spring Autoconfiguration
  • Provisioning of Truststores
  • Dev-Ops activities: reconfigure the applications in Azure and Config Repositories
  • Conducting deployments

12/2024 - Processing of ESG Business Figures

• Description: Report creation requires the provision of taxonomy and ESG data. A new microservice with its own web front-end enables the provision of processed data for individual companies as well as in batch operation. Business figures are requested via REST interfaces from an external service provider, prepared according to the specifications of the department, and made available both as an Excel file for download and sent to downstream systems via Kafka.
• Technologies used:Java 18, ArgoCD, GH Actions, github, Kafka, IDEA intelliJ 2023.2.5 Ultimate, Docker 4.24.0, Kubernetes 1.27.2, Helm
• Client:Nord/LB
• Activities:
  • Development from scratch
  • Design and creation of the microservice using hexagonal architecture
  • Front-end and back-end hosted in the same web server
  • Kafka connection
  • Export of the results as an Excel file
  • Extraction of mapping descriptions from Excel file

02/2024-11/2024 - Green Bond Reporting

• Description: The implementation of EU requirements necessitates the creation of extensive reports. The required data is maintained in a variety of existing and newly added internal banking systems. The data is consolidated, enriched, and sent to other systems via Kafka.
• Technologies Used: Java 18, Azure Blob Storage, ArgoCD, GH Actions, GitHub, Kafka, IntelliJ IDEA 2023.2.5 Ultimate, Docker 4.24.0, Kubernetes 1.27.2, Helm
• Client: Nord/LB
• Responsibilities:
  • Further development of five existing microservices
  • Design and creation of new microservices using hexagonal architecture
  • Migration of existing microservices to hexagonal architecture
  • DevOps: Administrative tasks in the Azure cloud
  • Introduction of end-to-end and integration tests for existing microservices
  • Definition of REST APIs via OpenAPI and implementation using Spring Boot
  • Integration of tests with Kafka
  • Creation of Kafka consumers and producers

09/2023-12/2023 - Digitization of Banking Processes

• Description: Three interlinked business processes for real estate valuation in a state bank need to be digitized. The BPMN and DMN diagrams provided by the business unit are prepared for execution in Camunda and the service tasks are implemented. Asset data is read from third-party systems, including SAP R/3, and updates are made. The correctness of the implementation is ensured by Given-When-Then tests.
• Technologies Used: Camunda 7.1, OpenAPI, Java 17, IntelliJ IDEA 2023.2.5 Ultimate, Docker 4.24.0, Kubernetes 1.27.2, Helm, ArgoCD, SAP R/3
• Client: Nord/LB
• Responsibilities:
  • Integration of BPMN and DMN models into Camunda; including some syntactic adjustments
  • Definition of service tasks based on BPMN
  • Implementation of service tasks based on descriptions in Jira tickets
  • Covering the functionality of service tasks with unit tests
  • Integration of third-party systems such as SAP using OpenAPI
  • Customization and extension of third-party mock servers
  • Integration of SSL certificates in Docker containers
  • Determining Camunda-specific methods for starting sub-workflows with specific data
  • DevOps tasks: Adjusting and extending deployment descriptions; carrying out deployments
  • Troubleshooting and bug fixing
  • Provision of REST APIs for the frontend and sister processes

09/2021-08/2023 - Payment Software

• Description: Context: In the context of credit card payments, terminals and other clients use REST APIs to communicate with a microservice developed (and further enhanced) by a small but highly effective team, which interacts with Hardware Security Modules (HSMs) in the background to perform the necessary cryptographic operations. The application runs in containers across multiple data centers.
• Technologies Used: Java 11, IntelliJ IDEA, macOS 13, Linux, Docker, Kubernetes, Helm, Lens, Jenkins, JIRA, Bitbucket, Git, Graylog, Grafana, Splunk, Postman, Spring Boot 2.7, Consul, Flyway, Resilience4j, JSON, Shedlock, Dius Pact, TestNG, Cucumber, Thales payShield 9000 & 10000
• Client: VISA
• Responsibilities:
  • Enhancement of the microservice
  • Migrating the microservice to hexagonal architecture
  • Conceptualization, proof-of-concept, and final implementation of a proxy-like migration tool that forwards REST calls to multiple data centers and monitors result equivalence
  • Design and implementation of contract tests using Pact
  • Creation of integration tests using Cucumber and necessary steps
  • Maintenance and extension of Jenkins pipelines
  • Low-level programming of Thales payShield HSM
  • Leading the conception and implementation of key re-encryption for the transition to another HSM

11/2021-04/2024 - Warehouse Management System

• Description: A proprietary warehouse management and logistics planning system used worldwide within the corporation has been gradually adapted to more modern technologies and approaches over time.
• Technologies Used: Java 8, Java 17, Ant, Maven, GitLab, Eclipse, IntelliJ
• Client: dm
• Responsibilities:
  • Designing a migration of the existing build process from shell scripts and Ant to Maven
  • Executing the migration
  • Maintaining and optimizing build pipelines in GitLab
  • Bug fixing
  • Advisory and consulting

Languages

• [Language] – [Proficiency Level]
• [Language] – [Proficiency Level]