Lead Java Backend Engineer for Scalable Mobile APIs

EPAM Systems; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

EPAM Systems, Inc. is seeking 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. Responsibilities include architecting the BFF layer, implementing REST endpoints, tackling legacy modernization, and ensuring strong unit test coverage.

Qualifications

• Extensive background in Java building server-side applications (5+ years).
• Expert-level Spring Boot experience building and maintaining services.
• High proficiency in REST API development, including legacy services.
• Deep understanding of algorithms and data structures for efficient code.
• Consistent unit testing ability with a test-driven approach.
• Strong collaboration and senior-level cross-functional teamwork.
• Ownership mindset with proactive communication and follow-through.

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 improvements.
• Modernize legacy code for reliability and readability.
• Create clean, testable code with strong unit test coverage.
• Connect to existing backend services and manage dependencies.
• Diagnose defects, identify root causes, and release patches quickly.
• Contribute to CI workflows and strengthen build tooling for smooth releases.
• Influence API and data design decisions to improve user experience.

Skills

Java server-side

Spring Boot

REST API development

Algorithms and data structures

Unit testing / TDD

Collaboration skills

Debugging / production incidents

CI / build tooling

Ownership mindset

Education

Bachelor's degree in Computer Science or related

Tools

Docker

Gradle

GraphQL

Kotlin

RAML

Job description

EPAM Systems, Inc. is seeking 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. Responsibilities include architecting the BFF layer, implementing REST endpoints, tackling legacy modernization, and ensuring strong unit test coverage.