Senior Java Developer - Stockholm ( Sweden)

Location-Stockholm (SE)Remote-25% (Hours per week - 40 )Assignment period -16 Oct 2026 -09 Jan 2027Deadline - 08 Oct 2026 Senior Java Developer – Fund Trading Platform | StockholmWe are looking for a Senior Java Developer to join a business-critical Fund Trading Platform team working on a modern solution for mutual fund order processing across the Nordic market.Key ResponsibilitiesDevelop scalable microservices using Java 21 & Spring BootBuild and integrate REST APIs and Kafka-based event flowsWork with Microsoft SQL and data integrityWrite clean, maintainable and testable code using OOP, SOLID principles and design patternsDevelop automated unit, integration, API, regression and functional testsWork with JUnit, Cucumber and test automation frameworksIntegrate automated testing into CI/CD pipelinesPerform API, Kafka, database and UI validationTroubleshoot defects and collaborate with Developers, DevOps and Product teamsContribute to continuous improvement and test automationRequired SkillsJava 21Spring Boot & MicroservicesREST APIsApache KafkaMicrosoft SQLJUnit & CucumberTest AutomationCI/CDObject-Oriented Design & Design PatternsStrong debugging and problem-solving skillsNice to Have: React, JavaScript/TypeScript, Selenium/Playwright/Cypress, Docker/Kubernetes, JPA/Hibernate, financial services or trading domain experience. About SpertonSperton is an international recruitment and consulting firm that helps organizations find and attract qualified specialists and leaders in sectors such as infrastructure, technology, energy, and industry.