Java Backend Developer (Onsite Hybrid)

Design, develop, and maintain Java-based backend services supporting payment processing and transaction workflows Build and enhance RESTful APIs used in card payments, billing, and financial integrations Develop responsive front-end components using modern JavaScript frameworks (React, Angular, or similar) Ensure applications remain compliant with PCI-DSS requirements, including secure data handling and encryption standards Apply secure coding practices to protect sensitive payment and cardholder data Participate in code reviews, architecture discussions, and sprint planning within an agile environment Collaborate closely with product owners, architects, and QA to deliver high-quality, scalable solutions Troubleshoot, debug, and optimize application performance in high-throughput systems Work on-site in the Atlanta office 3 days per week to support collaboration, design sessions, and agile ceremonies 8+ years of experience in Java/J2EE application development 8+ years of strong foundation in Core Java, including: OOP principles (inheritance, polymorphism, abstraction, encapsulation) Collections, multithreading, concurrency, and exception handling JVM fundamentals and memory management 5+ years of hands-on experience with Spring / Spring Boot 5+ years of proven experience building and supporting RESTful APIs Solid understanding of SQL and relational databases Prior experience in the payments or financial services industry, supporting transaction-based systems Demonstrated experience working in or supporting PCI-DSS compliant environments Front-end development experience with JavaScript, HTML, CSS, and at least one modern framework Experience with Git or similar version control systems Strong problem-solving skills and attention to detail Ability and willingness to work on-site in Atlanta 3 days per week (mandatory) Experience with microservices architecture Exposure to CI/CD pipelines and DevOps practices Cloud experience (AWS, Azure, or GCP) Experience with JUnit, Mockito, or other unit testing frameworks Prior work on high-volume payment platforms, gateways, or card processing systems Engineers who understand Java fundamentals deeply, not just framework usage Someone who can articulate why a solution works, especially in secure, regulated environments A collaborative team player who values clean, maintainable, and secure code Comfort working in a hybrid, in-office collaborative model