Senior Java Backend Engineer for High-Traffic Mobile APIs

EPAM Systems; Municipio de Esquel; On-site; ARS 136,430,000 - 181,906,000; Full time

Benefits offered by this job

Healthcare benefits

LinkedIn Learning access

Global career opportunities

Job summary

EPAM Systems seeks a Senior Server-side Engineer to design and evolve a Backend-for-Frontend service layer powering mobile experiences. You will craft REST endpoints, collaborate across cross-functional teams, and ensure reliable APIs while maintaining high-quality code.

Responsibilities include performance profiling, legacy refactoring, and contributing to CI workflows. A strong focus on clean, testable code, unit tests, and data-driven API design will be essential in this role.

Qualifications

• 3+ years of Java experience building server-side applications.
• Senior-level collaboration skills with cross-functional teams.
• Strong solution design skills for open-ended problems.
• Strong Spring Boot expertise for building and maintaining services.
• Strong REST API development skills, including integration with legacy services.
• Strong algorithms and data structures knowledge for efficient implementations.
• Strong unit testing skills and test-driven mindset.
• CI workflows and build tooling experience.
• Performance analysis and optimization skills for backend services.
• Strong troubleshooting skills for debugging and fixing production issues.

Responsibilities

• Design and build the Backend-for-Frontend API layer used by mobile applications.
• Implement REST endpoints and service contracts that support mobile user flows.
• Optimize service performance through profiling, analysis, and targeted improvements.
• Refactor legacy code to improve maintainability, readability, and reliability.
• Write clean, testable code and maintain strong unit test coverage.
• Integrate with existing backend services and handle bespoke and legacy dependencies.
• Fix defects by diagnosing root causes and shipping safe, timely patches.
• Collaborate with engineers, product partners, designers, and QA to deliver features.
• Contribute to CI workflows and build tooling to keep delivery smooth.
• Share ideas and advocate for great user experience through API and data design.
• Remove unnecessary code and reduce technical debt to keep the codebase healthy.

Skills

Java

Spring Boot

REST API design

Unit testing

CI/CD

Performance optimization

Problem solving

Team collaboration

English (B2)

Education

Bachelor’s degree in Computer Science or related field

Tools

Gradle

Docker

RAML

GraphQL

Kotlin

Job description

EPAM Systems seeks a Senior Server-side Engineer to design and evolve a Backend-for-Frontend service layer powering mobile experiences. You will craft REST endpoints, collaborate across cross-functional teams, and ensure reliable APIs while maintaining high-quality code.

Responsibilities include performance profiling, legacy refactoring, and contributing to CI workflows. A strong focus on clean, testable code, unit tests, and data-driven API design will be essential in this role.