Senior Java Developer (with Kotlin)

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

Job summary

EPAM Systems is seeking a Senior Java Developer with strong Kotlin expertise to build the Backend for Frontend services powering mobile apps used by millions of users worldwide. This hybrid role requires three onsite days in Atlanta, GA or Phoenix, AZ.

You will design, implement, and optimize RESTful APIs, collaborate with mobile, product, and QA teams, and contribute to scalable, high-performance backend systems.

Qualifications

• 5+ years of professional server-side development experience in Java/Kotlin
• Proficient with RESTful API design and asynchronous programming
• Strong emphasis on unit testing, CI/CD, and code reviews
• Experience with Gradle and modern software development lifecycle
• Background in Backend for Frontend (BFF) or mobile-facing architectures
• Familiarity with GraphQL or RAML for API design and documentation

Responsibilities

• Build, scale, and maintain server-side APIs consumed by mobile apps
• Write clean, high-quality Kotlin/Java code with performance focus
• Refactor and modernize legacy systems for better performance
• Integrate with internal services and third-party APIs in a distributed setup
• Collaborate with mobile engineers, product managers, designers, and QA to deliver end-to-end experiences

Skills

Java

Kotlin

REST APIs

CI/CD

Gradle

Open-source contributions

BFF architecture

GraphQL

RAML

Education

Bachelor's degree in Computer Science

Job description

We're seeking a Senior Java Developer with strong Kotlin expertise to build and scale the Backend for Frontend (BFF) service layer powering mobile applications used by tens of millions of users worldwide. This is a hybrid role requiring 3 days onsite in Atlanta, GA or Phoenix, AZ. If you thrive on solving complex problems, writing clean code, and building high-performance APIs — we'd love to connect.

Responsibilities

• Build & Scale Backend Services: Design, develop, and maintain the server-side API layer consumed by award-winning mobile applications
• Write High-Quality Code: Deliver clean, well-tested, production-ready Kotlin/Java code with a focus on performance and maintainability
• Optimize & Refactor: Improve existing systems, modernize legacy code, and drive performance analysis and optimization efforts
• Integrate Complex Systems: Connect with internal backend services, third-party APIs, and data sources across a distributed architecture
• Collaborate Cross-Functionally: Work closely with mobile engineers, product managers, designers, and QA to deliver seamless end-to-end experiences

Requirements

• Experience: 5+ years of professional experience in server-side software development with Java; Bachelor's degree in Computer Science or equivalent experience
• Kotlin: Strong hands-on proficiency in Kotlin for backend development is required
• API Development: Solid experience building and maintaining RESTful APIs, with familiarity in asynchronous programming and performance optimization
• Engineering Practices: Strong foundation in unit testing, CI/CD, build tools (Gradle), code reviews, and software development lifecycle best practices
• Problem Solving: Proven ability to design solutions for open-ended problems, debug complex issues, and work effectively with legacy systems
• Collaboration & Ownership: Self-starting mindset with excellent communication skills and the ability to thrive in a large, cross-functional team environment
• Nice to have Experience with GraphQL (GQL) or RAML for API design and documentation
• Contributions to or experience working with open-source projects
• Background in building Backend for Frontend (BFF) layers or mobile-facing service architectures