Senior Server-side Engineer

We are looking for a Senior Server-side Engineer to build and evolve a mobile service layer (Backend for Frontend) that powers high-traffic client experiences. You will collaborate with engineers, product partners, designers, and QA to deliver reliable APIs, optimize performance, and keep code quality high. Apply now to help shape the next generation of mobile backend services. Responsibilities Design backend-for-frontend APIs that support mobile client use cases Build Spring Boot services in Java with clean, maintainable architecture Implement REST endpoints with clear contracts and predictable behavior Optimize performance through profiling, tuning, and efficient data access Write unit tests to protect critical logic and enable safe changes Refactor legacy code to improve readability, safety, and extensibility Fix bugs through root-cause analysis and targeted remediation Integrate with existing backend services and adapt to evolving interfaces Implement asynchronous flows where needed to improve responsiveness Automate builds and checks within continuous integration pipelines Review code to uphold standards and share best practices Collaborate with product, design, and QA to deliver end-to-end features Requirements 3+ years of Java experience building server-side applications Strong leadership skills to influence technical decisions and mentor peers Proven project delivery experience in large cross-functional teams Solid Spring Boot knowledge for building scalable services Strong REST API design skills for contract-first, maintainable endpoints Strong algorithms and data structures skills for solving complex problems Strong unit testing skills to ensure correctness and prevent regressions Hands-on CI experience with build and test automation Experience with asynchronous programming and concurrency concepts Performance optimization skills including profiling and tuning Strong refactoring skills and ability to work with legacy code safely Excellent communication skills and a proactive, self-starting mindset Bachelor’s degree in Computer Science or related field, or equivalent experience Upper-Intermediate English proficiency (B2) Nice to have Docker experience for local development and deployment workflows Gradle experience for build configuration and dependency management GraphQL experience for flexible client-driven data fetching Kotlin experience for JVM-based backend development RAML experience for API modeling and documentation