Backend Developer - Java

Job Description We are seeking an Advanced Software Engineer to join a team playing a critical role in stabilizing a new system environment, integrating it with existing systems. The ideal candidate will have strong hands-on experience with Java, Spring/Spring Boot, backend services, API Gateway integrations, and enterprise payment systems, along with practical POS (point of sale) experience. Experience working in PCI-scoped environments is highly valued. Key Responsibilities Design, develop, and maintain backend services using Java and Spring Boot.Support the integration of the new POS platform with the current system.Develop and support integrations with enterprise API Gateway platforms and downstream services.Troubleshoot and stabilize POS-to-backend and payment processing integrations.Perform hands-on testing and troubleshooting using physical POS terminals and test hardware in the onsite POS lab.Develop secure, scalable, and highly available backend services.Work within PCI-scoped environments, adhering to applicable security and compliance standards.Collaborate with POS, payment, architecture, QA, DevOps, and product teams to resolve integration issues and accelerate delivery.Participate in technical design, code reviews, troubleshooting, and architecture discussions.Develop automated unit and integration tests to ensure reliable and maintainable solutions.Investigate complex integration and production issues and drive them through resolution.Support event-driven architectures and messaging technologies as required.Help establish development and integration practices for the newly formed team. Required Skills: Java, Spring, Spring Boot, REST APIs, API Gateway, Microservices, POS Integration, PCI/Secure Development Practices Preferred Skills: Kafka, Event-Driven Architecture, Payment Systems, CI/CD, Cloud, ContainersNoSQL (MongoDB, Cassandra...etc.)