About the Role
📍 Warsaw (Onsite – near Metro Plac Wilsona)💼 B2B / FreelanceAbout Silk Software HouseSilk Software House builds and maintains mission-critical backend systems for fintech, payments, and large-scale platforms. We value strong engineering judgment, ownership, and long-term cooperation over short-term delivery pressure.Your RoleAs a Senior Java Developer, you’ll take technical ownership of backend services, influence architectural decisions, and mentor other engineers. You’ll work directly on complex domains where performance, security, and reliability matter.ResponsibilitiesDesign and implement backend architectures using Java 11 and SpringLead development of microservices and APIsOptimize performance, scalability, and data consistencyWork deeply with Hibernate, transactions, and database internalsReview code, mentor developers, and set engineering standardsCollaborate with DevOps on deployments and observabilityRequirementsThis role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station5 years of commercial experience as a Java DeveloperStrong commercial experience with Java & Spring (Boot, Security, Data)Deep knowledge of Hibernate ORM, SQL databases, and JVM behaviorExperience designing scalable, maintainable backend architecturesProficiency with CI/CD, Git, Gradle, and production debuggingEffective use of AI-assisted development tools (ChatGPT, Claude, Cursor, Grok)English at B2 levelNice to HaveEvent-driven architecture (Kafka, queues)Cloud-native systems (AWS/GCP/Azure)Kubernetes, Docker, observability toolsExperience in fintech or high-traffic systemsRates (B2B)120–160 PLN / hourRecruitment ProcessIntro call (30 min)Senior-level technical interviewArchitecture & project discussionOfferTech StackJava: AdvancedSpring Boot: AdvancedHibernate: AdvancedPostgreSQL: AdvancedSolid: AdvancedDDD: AdvancedREST API: Advanced