ODBC Experts in Germany

• Further development and operation of a central backend service providing vehicle inventory for international Mercedes-Benz online stores
• Enhancement of a vehicle reservation service as part of the checkout process
• Design and implementation of a highly scalable end-to-end test architecture focused on maintainability, reusability, and a high number of automated test cases
• Development of a multi-layered test infrastructure with a clear separation of test logic and access layers
• Development of an initialization and caching architecture to significantly speed up local and CI/CD-based test runs
• Development of an AI-driven review architecture for automated evaluation and quality assurance of end-to-end tests
• Development of a dashboard to consolidate vehicle context across multiple backend systems, including AI-generated summaries and condensed case analyses
• Integration and further development of connections to various reservation systems via Apache Kafka and REST
• Design of new microservices and support in architectural decisions
• Risk analysis and planning of microservice migrations
• Technologies: Java, Spring, Spring Boot, Gradle, Maven, Apache Kafka, REST, OpenAPI, Swagger, GitHub, Confluence, CI/CD, Microservices, AI, LLMs

• Automated Python-based analysis of test script repositories
• Built a SQLite database for signal and value tracking
• Identified critical discrepancies with ad-hoc SQL queries
• Technologies: Python, SQLite, Excel/ODBC

• Creation of automated tests.
• Extension of the functionality of the enterprise BI data warehouse.
• Design and development in SQL and PL/SQL.
• Data modeling as well as performance measurement and tuning.
• Creation of and contribution to user stories and concepts.
• Technical environment: Windows, Linux.
• Database: Oracle 19c incl. DWH, CDB, PDB.
• Tools: Confluence, CVS, Eclipse, Git, GitLab, Jira, N4, PL/SQL, SQL Developer, utPLSQL.

• IT training in theory and practice for IT specialists in application development and system integration

Task

• Further development of a new ERP system with Blazor
• Creation of e-invoices in the XRechnung and ZUGFeRD formats
• UI/UX design Client-server system
• Windows 11 Technology
• Microsoft .NET 9, Git, Azure DevOps, ASP.NET, MSSQL, Blazor Programming languages
• C#, MVVM Development tools
• Microsoft Visual Studio .NET 2022 Database
• MSSQL Industry
• Other

• Set up an operational contract information system. This is mainly used as an order management system - for migrating existing contracts as well as for creating and providing new contract bundles.

• Sales agents can use it to order new services, modify existing ones and migrate service types, as well as provide price information to the customer.

• This supports the marketing of new services as well as the replacement of old services for existing customers.

• In addition, existing data is imported, processed (ETL) and provided via services for further use in the portal front end.

• Analysis of the business and technical use cases (workflows, involved processes/systems, communication paths, security requirements)

• Further development / creation of the front-end components (React/JavaScript)

• Design and implementation of the business logic

• Creation of the functional and technical component documentation

• Test execution / test automation (Cypress, test coverage)

• Team size: 8 people

• Technologies: React, JavaScript, Rest (JSon), Yaml, Markdown, MariaDB (SQL), Docker, Swagger, Cypress

• Tools: Webstorm, ReactDeveloperTools, VisualStudioCode, Word, DBeaver, Git/GitLab

• Work management: GitLab

• Platform: Linux

• Build management: GitLab

• Work with the Berlin-based fundgarden GmbH (fund.garden), a platform for funding management with a focus on the music sector
• Technologies: PHP 8.3–8.4, Laravel 12, Livewire 2–3, Tailwind CSS, AlpineJS

AI Readiness - Part 3: Creating an E-Book on the Use of AI in Software Testing

• Designing and creating an e-book on the meaningful and safe use of AI in software testing from the perspective of an experienced test expert.
• Using generative AI (ChatGPT, Perplexity Pro) as a sparring partner for structuring, wording suggestions and variant creation, with final technical review and approval of all content based on my own expertise.
• Developing practical opportunities and risks of AI in testing, with a special focus on collaboration between testers and AI instead of "tester vs. AI".
• Title: "11 Strong Reasons: Dream Team Instead of Rivals - Testers and AI Are Unbeatable Together"
• Subtitle: "How humans and machines form the perfect team in software testing—and why pure AI testing is risky."
• Planned use of the e-book as a basis for workshops, client presentations, or internal training.
• Technology: Generative AI, ChatGPT, Perplexity Pro, Microsoft Word, Adobe Acrobat, many years of professional testing experience, common sense.

• Provided coaching and support to Scrum teams to adopt and implement agile practices effectively
• Analyzed business requirements and identified IT solutions to support business goals
• Evaluated existing IT systems and processes to identify optimization opportunities
• Managed stakeholder relationships and coaching
• Facilitated Scrum ceremonies and ensured adherence to Scrum principles and practices
• Identified and implemented lean startup process optimizations to improve efficiency and effectiveness of development and business processes
• Developed and monitored daily business strategies to ensure development goals were met
• Developed and implemented OKR strategies to align team goals with company objectives
• Tools/Methodology: Jira, Confluence, Miro, PowerBI, team building & mentoring, conflict resolution, impediment resolution

• The client is undergoing a comprehensive transformation. All SAP ECC landscapes worldwide are being migrated to SAP S/4HANA, with the goal of introducing a global standard template.

• The program also includes the migration and modernization initiative "RISE with SAP", which may involve migrating selected country installations to the SAP Private Cloud.

• On the stakeholder side, the program's reporting line extends up to the company's board and the implementation partner's board.

• Fiserv Germany's ERP landscape currently includes several non-standard SAP tools and applications that extend the ECC environment's functionality and often integrate with downstream systems. As part of the move to SAP S/4HANA, it is essential to assess the core functionality, integration points, and future viability of these applications to determine their alignment with the target architecture.

• The focus of the role is to provide expert advice and assessment to define the scope, strategy, and roadmap for migrating Fiserv Germany's SAP ECC system to SAP S/4HANA.

• SAP's recommended best practices are followed, and a structured approach is used to ensure a smooth transition with minimal disruption while maximizing business value.

• This assessment forms the basis for a successful SAP S/4HANA transformation, ensuring alignment with industry best practices, regulatory compliance, and future scalability.

• Migration strategy definition – evaluating available transition approaches based on business objectives, technical feasibility, and SAP best practices.

• Technical readiness assessment – conducting a system analysis to assess compatibility, custom code impact, data volume management, integration points, and infrastructure readiness for SAP S/4HANA.

• Business process impact analysis – reviewing the latest business process documentation to define the scope and effort needed to implement required functions in SAP S/4HANA and identify process optimization opportunities.

• Roadmap for non-SAP systems and applications – evaluating third-party and legacy applications for SAP S/4HANA integration and recommending consolidation, migration, or replacement strategies.

• Deployment & implementation planning – defining a phased rollout approach, including project timelines, risk mitigation strategies, and key milestones aligned with business priorities.

• The transformation is carried out in phases: the discovery phase leads to the explore phase, which then leads to the design phase and finally to the implementation phase.

• Program management

• Change management

• Requirements management

• Transition management

• Stakeholder management

• Risk management

• Comprehensive coordination

• Projects for federal networks (NdB).
• CR management, EoL change requests, design and documentation according to ITSCM.
• Data center planning.
• Project management and engineering subproject management.
• Software development for virtual server environments according to BSI.

• Designed and implemented a new user support tower organization as part of the global IT transformation initiative.
• Created an operating and control model for the central service desk, including downstream support units (field service, VIP support, service points).
• Performed a comprehensive as-is analysis of existing service desk and field service structures and developed a target architecture based on ITIL 4 and SIAM.
• Defined roles, responsibilities, and governance mechanisms for internal IT and external providers.
• Prepared the blueprint document Service Management & Governance Handbook (User Support) to standardize global service processes (incident, request, problem, change, knowledge, ITSCM, CSI).
• Developed a KPI and SLA framework to measure service quality and performance in global user support.
• Defined the reporting and review structure (operations meeting, service review meeting, management steering board).
• Prepared RFP documents for the external tendering of L1/L2 support services, including definition of scope, governance model, process requirements, tool integration (ServiceNow), and KPI/SLA sets.
• Supported procurement and legal departments in evaluating and negotiating vendor proposals and assisted in vendor selection and contract finalization.
• Oversaw the handover to operational support, including knowledge transfer, training of provider teams, and establishment of a continuous improvement process (CSI).
• Methods / framework / tools: ITIL 4 / ITSM, SIAM, IT4IT, ServiceNow, Jira, BPMN, operating model canvas, KPI & SLA design, governance & performance management

• End-to-end quality assurance in a global S/4HANA transformation program.

• Automated test data setup, evaluation of search and generation solutions, and PoC execution (K2View, EPI-USE).

• Coordination between Siemens teams and external partners, and structured knowledge transfer to internal stakeholders.

• Created a basis for PoC decisions and sped up tool selection.

• Standardized test data provisioning and noticeably reduced lead times.

• Established governance for test data processes (policies, roles, KPIs).

• Sustainable know-how transfer: empowered internal teams to operate solutions on their own.

• Methods & technologies: S/4HANA, SAP, K2View, EPI-USE, test data management, data masking, data provisioning, test strategy, test management, coaching & enablement, Azure DevOps, Microsoft Office 365, Gemini.

• Taking over operational acceptance tests for internal and external applications in a preproduction environment
• End-to-end tests across multiple systems
• Planning and implementation of acceptances based on expected loads and service levels
• Creation of test plans and automated tests
• Monitoring of systems, log analysis and creation of test reports, monitoring charts and acceptance documentation
• Support during rollouts of security and OS patches in preproduction
• Load and performance tests as well as failover/rollback tests
• Testing SOAP/REST APIs with JMeter, Grafana and Kibana
• Batch tests with Bash and log analysis
• Load and performance tests of own applications
• Test automation with JMeter and PyTest
• Maintenance and creation of Bash scripting tests
• Manual system integration tests