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September 17, 2026

Java Integration Developer

Senior • On-site

Warsaw, Poland

Quick Facts

  • Role: Java Integration Developer

  • Work model: Contract (B2B)

  • Start: ASAP

  • Duration: 3 months, with possibility to extend to 6 months

  • Team setup: Work within or closely with Scrum teams

Description

Design and implement Java-based integration solutions, including synchronous and asynchronous workflows, using Spring Boot 3 / Spring Cloud and Apache Camel 4. Deliver reliable integrations by applying Enterprise Integration Patterns, covering error handling, idempotency, transactional behavior, and secure inter-system communication.

Responsibilities

  • Design and implement integration solutions using Apache Camel

  • Apply Enterprise Integration Patterns (EIP)

  • Develop synchronous and asynchronous system integrations

  • Integrate systems using SOAP, REST, and JMS with message brokers

  • Support integration reliability: error handling, idempotency, and transactions

  • Work with distributed systems and application integration architecture

  • Ensure secure communication via HTTP/HTTPS and SSL/TLS

Requirements

  • Minimum 5 years of commercial Java development experience

  • Strong knowledge of Java 17+

  • Hands-on experience with Spring Boot 3 or Spring Cloud

  • Hands-on experience with Apache Camel 4

  • Strong understanding of Enterprise Integration Patterns (EIP)

  • Experience designing and implementing synchronous and asynchronous integrations

  • Experience integrating systems using SOAP, REST, JMS, and message brokers

  • Knowledge of integration reliability: error handling, idempotency, transactions

  • Understanding of distributed systems architecture and application integration

  • Strong knowledge of PostgreSQL and SQL

  • Experience working with Docker

  • Practical experience with Kubernetes

  • Experience creating and maintaining unit and integration tests

  • Knowledge of HTTP/HTTPS, SSL/TLS, and secure communication between systems

  • Knowledge of SOLID, design patterns, and software engineering best practices

  • Ability to independently analyze problems and design technical solutions

Benefits

  • B2B contract

  • Start ASAP

  • 3-month engagement with possible extension to 6 months

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