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Kalu Szymczak

@kaluszymczak

Message

Oracle-certified Java backend developer focused on distributed systems and maintainable Spring-based architectures.

Portugal

Message

What I'm looking for

I’m relocating to Germany and seeking backend roles to keep developing my architectural and system-design skills—building clean, maintainable distributed services with Spring, strong engineering practices, and thoughtful collaboration with product and architecture teams.

Oracle-certified Java Developer with strong experience in backend engineering, distributed systems, and Spring-based architectures. I design clean, maintainable systems, drive refactoring initiatives, and contribute to architectural decisions across complex backend platforms.

At IBM IKC Data Lineage (2022–Present), I helped migrate a monolithic backend toward stateless architecture, created internal shared libraries, and built core lineage processing logic. I also owned the Lineage Export feature—from requirement analysis and technical proof-of-concepts to implementation planning—while working with Kubernetes/OpenShift for operational diagnostics and collaborating with an international remote team.

Experience

Work history, roles, and key accomplishments

Current

Java Developer (Backend)

Current

IBM IKC Data Lineage

Jan 2022 - Present (4 years 5 months)

Contributed to migrating a monolithic backend to a stateless architecture, defining refactoring guidelines and approaches. Owned the Lineage Export feature end-to-end, including requirement analysis, technical PoCs, implementation planning, and architectural alignment across teams.

Java Spring Boot Microservices Distributed Systems Event Driven Architecture REST APIs Kubernetes OpenShift RabbitMQ

Junior Java Developer

Siemens Mobility / Hacon

Jan 2021 - Present (5 years 5 months)

Developed and tested a reactive Spring WebFlux backend for a mobility platform enabling users to plan and reserve multimodal trips. Built REST controllers and service layers, implemented JWT authentication with Spring Security, and created unit tests with JUnit/Mockito.