07/17/2026 updated

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Senior Java Fullstack Engineer / Hands-on Solution Architect

Gdansk, Poland
Worldwide
M.Sc. Eng., Computer Science - Gdansk University of Technology
Gdansk, Poland
Worldwide
M.Sc. Eng., Computer Science - Gdansk University of Technology

Profile attachments

Tomasz_Kopiejc_Freelancermap_Senior_Java_Fullstack_EN.pdf

About me

Programming has fascinated me since my first ZX Spectrum and Atari ST, and that curiosity still drives me to explore technology and build reliable systems. Away from the keyboard, I enjoy scuba diving, motorcycling and practising Aikido - pursuits that reward focus, calm and continuous learning.

Client Server ModelsData ArchitectureEnterprise JavaBeansJava EE Connector ArchitectureJava ArchitecturesJava Development ToolsSoftware ArchitectureSolution ArchitectureFull Stack Development
Java Backend & Spring Ecosystem
Umfangreiche Kenntnisse in Java 8/11/17/21, Spring Boot, Spring Framework, Spring Security, JEE/Jakarta EE, Hibernate/JPA, Maven, Lombok und MapStruct fuer die Entwicklung enterprise-faehiger Backend-Systeme.

Microservices & Architekturdesign
Tiefgreifende Erfahrung in der Konzeption und Umsetzung von Microservices, modularen Monolithen, hexagonaler Architektur (Ports-and-Adapters), API-first Design, Domain Modelling und Legacy-Modernisierung.

CI/CD & Cloud-Infrastruktur
Praktische Erfahrung mit Docker, Docker Compose, Kubernetes, OpenShift, Jenkins, ArgoCD, GitLab CI sowie Azure DevOps Konzepten und AWS/ECR fuer die Automatisierung von Delivery-Pipelines.

Datenbankintegration
Kenntnisse in Oracle, PostgreSQL, MariaDB/MySQL, MSSQL sowie Einsatz von Liquibase und Flyway fuer Schema-Management, Partitionierung und Query-Optimierung.

Integration & APIs
Erfahrung mit REST, OpenAPI, SOAP, JAX-RS, Apache CXF, Axis/Axis2, JAXB, WSDL, HATEOAS und SAP-orientierter Integration fuer komplexe Systemverbindungen.

Testing & Qualitaetssicherung
Einsatz von JUnit, Testcontainers, Cucumber/Gherkin, Mockito, AssertJ, WireMock, MockServer, Jacoco und SonarQube fuer automatisierte Tests und Qualitaetssicherung.

Security & IAM
Kenntnisse in Keycloak, OAuth2, OpenID Connect, JWT, Spring Security, OPA, WS-Security, WSS4J und TLS fuer sichere Authentifizierungs- und Autorisierungsloesungen.

Messaging & Event-Driven Architecture
Erfahrung mit Kafka, ActiveMQ, RabbitMQ und Protobuf fuer event-getriebene Systemarchitekturen und asynchrone Kommunikation.

Experience

Professional experience10+ years
Freelancer since2000

Languages

GermanFluentEnglishFluentPolishNative speaker

Project history

Solution Architect / Senior Java Developer / Product Manager

IT-friends, Gdansk
Work on enterprise systems for healthcare, insurance and public-sector-like domains, including sensitive data, external integrations, business process automation, security and production-oriented delivery. Designed and implemented backend architecture using Java, Spring Boot, OpenAPI, persistence layers, integration services and security components. Built and modernized microservice-oriented backend components. Designed quasi-hexagonal architecture for Consent Management with OPA-based authorization and Liquibase-managed schema evolution. Supported CI/CD and GitOps-style delivery using Jenkins, ArgoCD, Docker and Kubernetes/OpenShift.

Product Manager / Architect

UST Global
Worked on a new logistics system for hospitals and healthcare environments. Supported architecture, backend direction and technology research for enterprise systems. Cooperated with stakeholders and development teams on product and technical decisions.

Project Manager / Architect

Private Contracts
Designed Java/JEE architectures and WebService-based integrations. Integrated Motorola SB1 hardware with hospital Esculap environments. Managed project delivery and technical coordination.

Project Manager / Architect

SII
Worked on insurance and banking projects, including claims systems, workflow, document management and secure login/mobile web solutions. Used Java/JEE, Struts, JSF, Hibernate, EJB, jBPM, OpenKM and integration technologies.

Team Leader / JEE Web Architect

Sprint
Designed and developed contact centre systems, Click2Call middleware and reporting systems. Used Java EE, JSF, Hibernate and EJB.

Assistant Director / Team Leader / Project Designer

ATENA
Led development teams and delivered insurance and financial systems. Worked on SAP Business Partner / SAP CRM integration with ABAP and RFC-enabled BAPI interfaces.

Developer / Technical Lead

Earlier Career
Built business systems in Delphi, C++, Java and relational databases.

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