Senior Software Engineer (2)

Position Overview We are seeking a Senior/Advanced Java Developer to support a newly established team working on an Omnichannel Payment Platform (OPP) and a new Point-of-Sale (POS) system. The consultant will help stabilize the POS environment and integrate it with the OPP platform. The ideal candidate will have strong hands-on experience with Java, Spring, Spring Boot, REST APIs, backend microservices, API Gateway integrations, enterprise payment systems, and POS environments. Experience working in PCI-scoped or security-sensitive environments is highly valued. Top Required Skills 7+ years of senior-level Java development experience Strong hands-on experience with Java, Spring, and Spring Boot Experience developing RESTful APIs and backend microservices Experience with API Gateway integration and enterprise system integrations Hands-on Point-of-Sale (POS) experience, including POS terminals or related test environments Experience in PCI-scoped, payment, financial, or security-sensitive environments Strong ability to work onsite with cross-functional technical teams Required Technology Stack 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 Containers Key Responsibilities Design, develop, and maintain backend services using Java and Spring Boot. Integrate the new POS platform with the Omnichannel Payment Platform (OPP). 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 and follow applicable security and compliance standards. Collaborate with POS, payment, architecture, QA, DevOps, and product teams. Participate in technical design, code reviews, troubleshooting, and architecture discussions. Develop automated unit and integration tests. 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 OPP/POS team. Important No SQL requirement. Required Technology Stack 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 Containers Key Responsibilities Design, develop, and maintain backend services using Java and Spring Boot. Integrate the new POS platform with the Omnichannel Payment Platform (OPP). 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 and follow applicable security and compliance standards. Collaborate with POS, payment, architecture, QA, DevOps, and product teams. Participate in technical design, code reviews, troubleshooting, and architecture discussions. Develop automated unit and integration tests. 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 OPP/POS team. Important No SQL requirement.