Senior Full Stack Software Engineer – Java | Spring Boot | Vue.js

Senior Full Stack Software Engineer – Java | Spring Boot | Vue.js Contract: FreelanceStart: October 2026Duration: Until the end of December 2026Workload: Full-timeLocation: Remote, must be EU- or UK-basedLanguage: English The Project: We are looking for an experienced Senior Full Stack Software Engineer to support the development of a modern buying solution within a large Tech Supply environment. The platform automates and optimises end-to-end purchasing and article onboarding workflows, connecting technology, buying, supply and business intelligence functions. You will work across both backend and frontend development on a modern, Kubernetes-based technology stack, with a strong focus on scalability, resilience and short release cycles. What You’ll Do: Design, develop and maintain backend services using Java and Spring BootBuild and enhance frontend functionality using Vue.jsDevelop and maintain event-driven services using KafkaWork with distributed systems in a cloud-native, Kubernetes-based environmentCollaborate closely with product teams and cross-functional Tech & Supply stakeholders, including Buying and Business IntelligenceContribute to software design and architecture decisionsBuild resilient, scalable and maintainable solutionsSupport the complete development lifecycle, including unit, integration and functional testingWork with CI/CD pipelines and modern monitoring and observability toolingTroubleshoot, profile and optimise application performance What We’re Looking For: You should bring: 5+ years of hands-on Java and Spring Boot experienceStrong experience with event-driven architecture and KafkaGood understanding of distributed systemsCommercial frontend development experience with Vue.js or a comparable modern JavaScript frameworkStrong experience with Kubernetes and containerised/cloud-native applicationsVery good knowledge of relational databases, ideally PostgreSQLExperience with automated unit, integration and functional testingCI/CD experience using tools such as Jenkins and/or GitLabExperience with application monitoring, profiling and performance tuningFamiliarity with ELK, Prometheus and GrafanaAbility to contribute to architecture and technical design discussionsFluent English, as this is the primary working language Tech Environment: Java | Spring Boot | Vue.js | Kafka | Kubernetes | PostgreSQL | Jenkins | GitLab | ELK | Prometheus | Grafana The Setup: This is a full-time freelance assignment running from October until the end of December 2026.The project can be delivered remotely, working as part of an international, cross-functional product and engineering environment, but candidates MUST be based in the EU and/or UK. We are particularly interested in senior engineers who are genuinely comfortable working across the stack rather than backend developers with only limited exposure to frontend development.