Location: hybrid: 1 - 2 times a month in the office (Wrocław or Poznań)Tasks Increase unit and integration test coverage, focusing on complex and legacy modules Prepare and maintain a Docker image of the database used for integration tests Build and maintain a Testcontainers‑based integration testing framework Support refactoring of modules that cannot be meaningfully tested in their current form Improve structure and consistency of test code across the backend Maintain CI/CD stages including coverage, performance and reliability checks Ensure long‑term maintainability of the test suite Requirements Java 21 Spring Boot 3.x JUnit 5 Mockito AssertJ Testcontainers for integration tests with real databases Docker for building and running local environments Azure Cloud services including SQL DB, App Services, Application Gateway, Application Insights, Log Analytics workspace, ADF, Storage Account and Key Vault Bicep for IaC definitions Azure Pipelines with YAML‑based CI/CD Hybrid mode: 1–2 times per month in the office Nice to have: familiarity with financial or regulatory systems Nice to have: experience with FSCP or SSNS stacks Nice to have: understanding of performance tuning Nice to have: experience with Playwright for E2E testing Nice to have: experience with JMeter for performance and load testing Offer Multisport card Private healthcare Access to an e‑learning platform Group life insurance