Lead Java Server-side Engineer to drive a Backend-for-Frontend service layer powering high-traffic mobile products used by clients worldwide. You will work closely with engineers, product partners, designers, and QA to ship reliable APIs, improve legacy integrations, and keep performance high.
Responsibilities
- Architect and build the Backend-for-Frontend API layer consumed by mobile applications
- Implement REST endpoints and define service contracts aligned to mobile user flows
- Optimize backend performance through profiling, analysis, and focused improvements
- Modernize legacy code through refactoring to improve reliability and readability
- Create clean, testable code and keep unit test coverage at a strong level
- Connect to existing backend services and manage bespoke and legacy dependencies
- Diagnose defects, identify root causes, and release safe patches quickly
- Partner with engineers, product partners, designers, and QA to deliver features end to end
- Contribute to CI workflows and strengthen build tooling to keep releases smooth




- Promote great user experience by influencing API and data design decisions
- Reduce technical debt by removing redundant code and keeping the codebase healthy

Requirements
- Extensive background in Java building server-side applications (5+ years)
- Strong collaboration skills in senior-level, cross-functional environments
- Proven strength in solution design for problems with unclear constraints
- Expert-level Spring Boot experience building and maintaining services
- High proficiency in REST API development, including working with legacy services
- Deep understanding of algorithms and data structures for efficient code
- Consistent unit testing ability with a test-driven approach
- Working knowledge of build tools and practical experience with CI workflows
- Demonstrated performance profiling and optimization skills for backend services
- Strong debugging and troubleshooting skills for production incidents
- Ownership m

📌 Lead Java Server-side Engineer (Argentina)
🏢 EPAM Systems
📍 Argentina