Senior Back-end Java Engineer

Senior Back-end Java Engineer | Distributed Systems | Malmö We are looking for an experienced Back-end Java Engineer to build and operate large-scale, privacy-critical services used by millions of users globally. This is a technically deep role focused on Java, distributed systems, scalability, reliability, performance and security with full end-to-end service ownership. Location: Malmö, SwedenWork model: 100% onsite, 5 days/weekAvailability: Evening meetings approx. 2x/weekAssignment: 6 months + extensions Key ResponsibilitiesDesign, build and operate high-scale Java backend services.Own services from architecture and development through production operations.Improve performance, reliability, availability and security.Troubleshoot complex issues involving concurrency, load and distributed systems.Build and improve APIs, frameworks and reusable backend capabilities.Collaborate across engineering teams and manage technical dependencies.Drive improvements in architecture, automation, testing and CI/CD. Key Requirements5+ years of strong production backend engineering experience.Deep Java expertise, including memory model, garbage collection and allocation pressure.Strong concurrency knowledge including java.util.concurrent, virtual threads and/or reactive models.Experience building and scaling customer-facing web services.Strong understanding of distributed systems, consistency, partitioning and failure modes.Experience with Cassandra, Redis, memcached or similar technologies.Experience developing REST services using Netty or similar frameworks.Strong knowledge of authentication, authorization, performance and reliability.CI/CD and automated testing experience. Nice to HaveCryptography including PKCS, KMIP, X.509, AES, KDF or CA.Privacy-preserving or security-critical platforms and key management.Kubernetes, Docker, GitHub, Maven and Spinnaker.ML systems, frameworks or algorithms.