We are looking for a 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. Apply today to help define the next wave of mobile platform capabilities.

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 troub

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