10/04/2026 updated
ŁP
100 % available
Senior Java Engineer & Solution Architect
Bielsko-Biała, Poland
Only remote
M.Sc. Computer ScienceAbout me
Senior Java engineer and solution architect with 16+ years of experience in designing, developing and modernizing enterprise software. I build scalable backend systems, cloud native solutions and secure integrations. Founder of OrbitBytes.
Java (Programming Language)Spring SecurityApplication Programming Interfaces (APIs)Applications ArchitectureCloud EngineeringDevOpsJava ArchitecturesSpring FrameworkSoftware ArchitectureService-Oriented ArchitectureSolution ArchitectureSystems IntegrationSpring CloudSpring BootBackend
Java & Spring Boot Development
Expertise in building enterprise-grade backend systems using Java 21, Spring Boot 4, Spring Security, and Hibernate. Extensive experience in designing scalable, cloud-native applications and modernizing legacy systems.
Cloud & DevOps Engineering
Proficiency in cloud platforms including Azure and AWS, with hands-on experience in Docker, Kubernetes, CI/CD pipelines, GitHub Actions, and Jenkins. Deployment and infrastructure management for production-grade systems.
Solution Architecture & Microservices
Deep knowledge in designing microservices architectures, event-driven systems, and distributed platforms. Experience migrating monolithic applications to cloud-native, scalable architectures using Kafka, REST API, and SOAP integrations.
Security & Identity Management
Strong background in OAuth2, OpenID Connect, Keycloak, SCIM, JWT, and SSO for implementing secure authentication and authorization in enterprise applications.
Databases & Messaging
Hands-on experience with PostgreSQL, MongoDB, Redis, Kafka, and RabbitMQ for data persistence, caching, and asynchronous messaging in distributed systems.
Frontend Development
Practical knowledge of Vaadin 25, Hilla, Vue 3, and TypeScript for full-stack development, including PWA applications for web and mobile platforms.
Integration & API Design
Experience in designing and implementing REST APIs, SOAP (Apache CXF) integrations, and event-driven architectures for seamless system interoperability.
Payment & Fintech Integrations
Implementation of payment integrations including PayNow and BLIK within food ordering and financial platforms, as well as income analyzers for the US mortgage market.
Expertise in building enterprise-grade backend systems using Java 21, Spring Boot 4, Spring Security, and Hibernate. Extensive experience in designing scalable, cloud-native applications and modernizing legacy systems.
Cloud & DevOps Engineering
Proficiency in cloud platforms including Azure and AWS, with hands-on experience in Docker, Kubernetes, CI/CD pipelines, GitHub Actions, and Jenkins. Deployment and infrastructure management for production-grade systems.
Solution Architecture & Microservices
Deep knowledge in designing microservices architectures, event-driven systems, and distributed platforms. Experience migrating monolithic applications to cloud-native, scalable architectures using Kafka, REST API, and SOAP integrations.
Security & Identity Management
Strong background in OAuth2, OpenID Connect, Keycloak, SCIM, JWT, and SSO for implementing secure authentication and authorization in enterprise applications.
Databases & Messaging
Hands-on experience with PostgreSQL, MongoDB, Redis, Kafka, and RabbitMQ for data persistence, caching, and asynchronous messaging in distributed systems.
Frontend Development
Practical knowledge of Vaadin 25, Hilla, Vue 3, and TypeScript for full-stack development, including PWA applications for web and mobile platforms.
Integration & API Design
Experience in designing and implementing REST APIs, SOAP (Apache CXF) integrations, and event-driven architectures for seamless system interoperability.
Payment & Fintech Integrations
Implementation of payment integrations including PayNow and BLIK within food ordering and financial platforms, as well as income analyzers for the US mortgage market.
Experience
Professional experience10+ years
Freelancer since2010
Languages
GermanBasic knowledgeEnglishFluentPolishNative speaker
Project history
Own company run in parallel with the role at ICE Mortgage Technology. Design and development of custom software solutions for business clients, including ServioHub (Fleet Service Platform) and Snack/Vegequchnia (Food Ordering Platform). Responsibilities include architecture and full-stack development, integrations with external systems (SOAP, REST), deployment on Azure, CI/CD and infrastructure setup, microservices architecture, and payment integrations (PayNow, BLIK).
Design and development of income analyzers for the US mortgage market using Java 17, Spring Boot, Kafka, PostgreSQL, and AWS EKS.
Migration of legacy system to microservices and implementation of Single Sign On platform using Java, Spring Boot, Keycloak, PostgreSQL, and AWS.