Senior Backend Engineer: Java, Spring Boot, REST APIs

EPAM Systems; Municipio de Esquel; On-site; ARS 2,500,000 - 4,500,000; Full time

Benefits offered by this job

Healthcare benefits

Employee financial programs

Paid time off and sick leave

Job summary

EPAM Systems is seeking a Senior Server-side Engineer to build and evolve a mobile service layer (Backend for Frontend) powering 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.

You will design backend-for-frontend APIs, build Spring Boot services in Java, implement REST endpoints, and optimize performance.

Qualifications

• 3+ years of Java server-side experience.
• Ability to lead 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)

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.

Skills

Leadership

Java backend

REST APIs

Performance

CI/CD

Refactoring

Communication

English (B2)

Education

Bachelor’s degree in CS or related field

Tools

Docker

Gradle

GraphQL

Kotlin

RAML

Job description

EPAM Systems is seeking a Senior Server-side Engineer to build and evolve a mobile service layer (Backend for Frontend) powering 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.

You will design backend-for-frontend APIs, build Spring Boot services in Java, implement REST endpoints, and optimize performance.