Enterprise Java Consultant & Distributed Systems Architect

Senior Java/Full-Stack Engineer & Architect. 10+ years scaling high-throughput microservices (Spring Boot 4.x, Kafka) in regulated sectors. Specialist in resilient architecture & DB tuning. Seamlessly integrates to accelerate delivery.

• Angular
• Apache Kafka6 J.
• Docker2 J.
• IT-Berater2 J.
• Java (allg.)4 J.
• Kubernetes2 J.
• Microservice Arcitecture
• Mongodb
• Open Shift
• Relationale Datenbanken
• Spring Boot

Senior Java & Distributed Systems Architect. I bridge the gap between business goals and tech. A client-focused team player driving high-precision results through knowledge sharing. My core expertise:

SENIOR Java/FULL-STACK ENGINEER & DISTRIBUTED SYSTEMS ARCHITECT

ARCHITECTURE, FAULT TOLERANCE & DISTRIBUTED SYSTEMS
- High-Throughput Microservices: 15+ years of designing and scaling microservices for Banking, Fintech, InsurTech, and VOD Streaming (maintaining up to 99.9% uptime).
- Distributed Transactions: Experience resolving dual-write challenges using Saga and Transactional Outbox Patterns to keep microservices consistent.
- Fault Tolerance & Resilience: Built consumer resilience setups using Retry Mechanisms, Dead Letter Queues (DLQ), and Idempotent Consumers.
- Domain-Driven Design (DDD): Mapping business logic into clean components using Bounded Contexts and Aggregates.
- Security & Permissions: Modernized mission-critical Four-Eye Principle permission ecosystems for major German banking providers aligning with strict European standards.

JAVA ECOSYSTEM & DATABASE TUNING
- Core Tech & Framework Migrations: Hands-on experience upgrading enterprise applications from legacy versions to modern Java 17/21, Spring Boot 3.x/4.x, and Spring Cloud.
- Database & Query Tuning: Re-engineered a heavy 9-table legacy bottleneck into a single, optimized SQL UNION ALL query, reducing endpoint latency from 2000ms to 20ms (98% reduction).
- Persistence Layer: Advanced Hibernate/JPA tuning. Implemented a critical migration strategy from Identity to Sequence-based generation (IdClass) resolving a complex Hibernate Second-Level Cache and composite key bottleneck.
- Financial Precision: Engineering portfolio rebalancing and fund switching mechanisms leveraging BigDecimal to maximize mathematical precision (99.9% rounding correctness).

KAFKA, EVENT STREAMING & CLOUD DEVOPS
- Apache Kafka: Designed event-driven communication pipelines for core banking, logistics, and warehouse fulfillment. Configured multi-broker setups and consumer group balancing.
- Multi-Cloud & Deployment: Practical experience deploying microservices across Red Hat OpenShift, Kubernetes, AWS (S3, EC2), and Google Cloud Platform (GCP). Reduced warehouse system downtime by 50% through cloud telemetry.
- Configuration & Security: Integrated secure application configurations and environment variables injected via HashiCorp Vault and Keycloak.
- High-Precision Data Migrations: Built data reconciliation frameworks verifying accuracy for 150K+ pension accounts with zero data loss during core infrastructure migrations.
- Tech Stack: Oracle DB (11g), PL/SQL, DB2, iBatis, MySQL, MariaDB, PostgreSQL, Angular, JSP, JavaScript, and database versioning via Liquibase.

INSURANCE DOMAIN & GRAPHTALK (GT AIA)
- 13+ Years GraphTalk Expertise: Acted as Global R&D Contract Domain Lead, managing core functional and technical logic on the GraphTalk platform for Tier-1 insurers (Allianz, AXA, PREDICA, etc.).
- Core Modules: Configuring individual, open group, and group contract lifecycles, clauses, beneficiaries, and calculation rules.
- French Healthcare Compliance: Expert implementation of Régime Obligatoire (RO), Régime Complementaire (RC), NOEMIE flows, and Tiers Payant (TP Card) automated mass batch processing systems.

OBSERVABILITY, TESTING & AI DEVELOPMENT
- Monitoring & Telemetry: Setting up Prometheus, Grafana, and Graylog dashboards. Optimized real-time telemetry pipelines, improving monitoring metrics response time from 2 min to 10 sec (91.67% latency reduction).
- Load Testing: Writing rigorous stress-test scenarios using Apache JMeter to detect thread and memory bottlenecks under high concurrency.
- Team Leadership: Proven history of mentoring engineering teams, defining technical scope, and reducing onboarding times by 30%.
- AI-Assisted Development: Leveraging Claude Code CLI and modern AI tools to accelerate code refactoring and development speed.

I am a Senior Java Consultant and Distributed Systems Architect with over 20 years of experience designing highly available systems for regulated industries. For me, a deep understanding of the business logic is the primary key to successful software.As a team player with a sharp client focus, I believe that sharing knowledge beyond the immediate team, supporting each other, and brainstorming together are the driving forces behind great project results. I focus on implementing industry best practices not just within the source code, but also to ensure that technical architectures fully support real-world business objectives.Beyond my core tech stack, here is an overview of the methodologies, practices, and interpersonal skills I bring to a project

METHODOLOGIES & SOFTWARE ENGINEERING PRACTICES

- Agile Frameworks: Working in Scrum and Kanban environments, including cross-team synchronization.
- CI/CD & Automation: Setting up automated build and deployment pipelines to keep code quality high.
- Testing Paradigms: Clean Architecture testing strategies, including Test-Driven Development (TDD), Integration Testing, and Component Testing.
- Code Quality & Governance: Using tools like SonarQube and defining clean code standards for the project.

BUSINESS & INTERPERSONAL SKILLS

- Attention to Detail: Focus on understanding the business logic as the key to successful software, ensuring data consistency, proper edge-case handling, and exact precision across complex systems.
- Teamwork & Knowledge Sharing: Mentoring junior and mid-level developers, running internal knowledge-sharing sessions, and helping the team deliver faster.
- Client Satisfaction & Trust: Building customer trust by delivering reliable software on time and making sure technical decisions solve real business problems.
- Requirements Engineering: Talking directly with product owners and business teams to translate their requirements into tech tasks.
- Technical Documentation: Writing clear documentation, architectural blueprints
- Legacy Codebases: Analyzing, refactoring, and reverse-engineering complex legacy code, even when documentation is missing.