Senior Java Developer (with Kotlin)

Back to SearchHybrid in United States of America: Atlanta, United States of America: PhoenixLooking for something else?Find a vacancy that works for you. Send us your CV to receive a personalized offer.Find me a jobLocation-specific conditions & benefits*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.Req# 1033156951Build & Scale Backend Services: Design, develop, and maintain the server-side API layer consumed by award-winning mobile applicationsWrite High-Quality Code: Deliver clean, well-tested, production-ready Kotlin/Java code with a focus on performance and maintainabilityOptimize & Refactor: Improve existing systems, modernize legacy code, and drive performance analysis and optimization effortsIntegrate Complex Systems: Connect with internal backend services, third-party APIs, and data sources across a distributed architectureCollaborate Cross-Functionally: Work closely with mobile engineers, product managers, designers, and QA to deliver seamless end-to-end experiencesExperience: 5+ years of professional experience in server-side software development with Java; Bachelor's degree in Computer Science or equivalent experienceKotlin: Strong hands-on proficiency in Kotlin for backend development is requiredAPI Development: Solid experience building and maintaining RESTful APIs, with familiarity in asynchronous programming and performance optimizationEngineering Practices: Strong foundation in unit testing, CI/CD, build tools (Gradle), code reviews, and software development lifecycle best practicesProblem Solving: Proven ability to design solutions for open-ended problems, debug complex issues, and work effectively with legacy systemsCollaboration & Ownership: Self-starting mindset with excellent communication skills and the ability to thrive in a large, cross-functional team environmentExperience with GraphQL (GQL) or RAML for API design and documentationContributions to or experience working with open-source projectsBackground in building Backend for Frontend (BFF) layers or mobile-facing service architectures