Senior Java Engineer

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Description

Senior Software Engineer — Java / Microservices Start date: ASAP | Contract type: B2B (145-170pln) | Work mode: 100% Remote About the Team You'll be joining a multidisciplinary team of senior engineers within a Consumer & Merchant domain, working on end-to-end parcel creation flows and some of the company's largest technical initiatives. The team operates with high autonomy — engineers have real influence over architectural decisions and drive solutions from analysis all the way to production. The culture is built on knowledge sharing, mutual respect, and engineering excellence , with a genuinely friendly atmosphere. Your Responsibilities Design and implement microservices following Hexagonal Architecture principles within a large-scale distributed system Drive topic analysis and requirement discovery — from business needs to solution architecture and delivery Build and maintain event-driven integrations using Kafka, Avro, and the Transactional Outbox pattern Write comprehensive automated tests : unit, integration, contract (Spock, Testcontainers, Spring Cloud Contract) Participate actively in code reviews and help raise the bar on code quality Work in a CI/CD environment : GitLab CI, Docker, Kubernetes + Helm (GitOps) Use AI-assisted development tools (Claude Code is the team standard) as a primary daily productivity tool — agentic, AI-first development is how this team operates Tech Stack Language & Frameworks: Java 21, Spring Boot 3.x/4.x (MVC & WebFlux), Gradle Databases:

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