We are seeking a Senior Java Engineer to build and evolve a Backend for Frontend service layer that powers high-traffic mobile experiences for clients worldwide. You will collaborate with engineers, product partners, designers, and QA to deliver fast, reliable APIs and maintain beautiful code.

Responsibilities

- Design and deliver the Backend for Frontend API layer for mobile clients
- Build server-side services in Java using Spring Boot and modern patterns
- Implement and maintain REST APIs with attention to usability and consistency
- Optimize performance through profiling, analysis, and targeted improvements
- Write unit tests and enforce quality gates through continuous integration
- Refactor and simplify codebases by improving or removing legacy code safely
- Fix defects quickly and prevent regressions through root-cause analysis
- Collaborate with engineers, product partners, designers, and QA to ship features
- Integrate with existing backend services and handle compatibility constraints
- Propose solutions for ambiguous problems and communicate technical tradeoffs

Requirements

- 3+ years of Java backend development experience




- Strong Spring Boot experience building server-side applications
- Strong REST API design and integration experience
- Strong algorithms and data structures knowledge
- Strong unit testing skills and experience with test automation
- Build tool experience with CI pipelines and automated quality checks
- Performance optimization skills for asynchronous and high-throughput services
- Problem-solving skills for open-ended technical challenges
- Team collaboration skills in cross-functional environments
- Self-starter mindset with ownership and initiative
- Bachelor’s degree in Computer Science or equivalent practical experience
- Upper-Intermediate English skills (B2) for clear written and spoken communication

Nice to have

- Docker experience for local development and deployments
- Gradle experience for builds and dependency management
- GraphQL experience for API schema design and query optimization
- Kotlin experience in server-side development
- RAML experience for API modeling and documentation

📌 Senior Java Engineer (Buenos Aires)
🏢 EPAM Systems
📍 Buenos Aires