Middle / Strong Middle Java Backend Developer

We’re looking for a motivated Middle or Strong Middle Java Backend Developer to join our team and help build a large-scale, multi-tenant B2B2C platform. This role is for someone who enjoys complex backend systems, clean architecture, and real product ownership. You’ll work in a modern microservice environment with Java 21, Spring Boot 3, PostgreSQL, Redis, Kafka, and Gradle, contributing to a platform designed for multiple tenants, brands, and markets. What you’ll do Develop and maintain backend microservicesBuild scalable, reliable, and secure APIsWork with distributed systems and event-driven architectureDesign and improve integrations between servicesParticipate in architecture discussions and technical decisionsWrite clean, testable, production-ready codeCollaborate with product, QA, DevOps, and other engineersUse AI tools such as Claude, Codex, and similar assistants to improve speed and qualityOur stack Java 21, Spring Boot 3, Gradle, PostgreSQL, Redis, Kafka, Docker, Kubernetes, microservices, transactional outbox, domain-driven design We’re looking for someone who Has solid commercial experience with Java and Spring BootUnderstands backend architecture and microservice principlesHas good SQL and database design skillsKnows how to write clean, maintainable codeUnderstands async flows, integrations, or event-driven systemsIs proactive, responsible, and motivatedFeels comfortable working with modern AI developer toolsCommunicates well and works effectively in a teamNice to have Experience with multi-tenant platformsExperience with Kafka, Redis, or high-load systemsUnderstanding of distributed transactions, consistency, and reliability patternsExperience in complex B2B, B2C, or platform productsWhat we offer Complex product and interesting technical challengesReal ownership and influence on architectureStrong engineering cultureAI-friendly development workflowOpportunity to grow professionally and technicallyCollaborative, modern, and supportive team environmentSend your CV to admin@flexsoft.dev.