Lead Java Server-side Engineer

We are seeking a Lead Java Server-side Engineer to drive a Backend-for-Frontend service layer powering high-traffic mobile products serving clients worldwide. Collaborate closely with engineers, product partners, designers, and QA to deliver reliable APIs, enhance legacy integrations, and sustain top performance. Apply today to help shape the next wave of mobile platform capabilities. Responsibilities Design and build the Backend-for-Frontend API layer consumed by mobile applications Develop REST endpoints and define service contracts aligned to mobile user flows Enhance backend performance through profiling, analysis, and targeted improvements Refactor legacy code to boost reliability and readability Write clean, testable code and sustain unit test coverage at a strong level Integrate with existing backend services and manage bespoke and legacy dependencies Investigate defects, pinpoint root causes, and ship safe patches quickly Collaborate with engineers, product partners, designers, and QA to deliver features end to end Support CI workflows and strengthen build tooling to keep releases smooth Advocate for great user experience by influencing API and data design decisions Cut technical debt by eliminating redundant code and keeping the codebase healthy Requirements Bachelor's degree in Computer Science or related discipline, or equivalent experience 5+ years of experience building server-side applications in Java At least 1 year of relevant leadership experience Expertise in Spring Boot for building and maintaining services Proficiency in REST API development, including working with legacy services Understanding of algorithms and data structures for efficient code Competency in consistent unit testing with a test-driven approach Knowledge of build tools and practical experience with CI workflows Showcase of solution design for problems with unclear constraints Qualifications in performance profiling and optimization for backend services Capability to debug and troubleshoot production incidents effectively Ownership mindset with proactive communication and follow-through Skills in collaboration within senior-level, cross-functional environments Excellent command of written and spoken English (B2+ level) Nice to have Familiarity with Docker for local containerized development and CI pipeline execution Flexibility to use Gradle for build configuration and dependency management Expertise in GraphQL and GQL API design and consumption Proficiency in Kotlin for JVM-based server-side development Knowledge of RAML for API modeling and documentation