Senior Java Engineer for POS & OPP Integrations

Hudson Manpower; Cincinnati (OH); On-site; USD 120,000 - 150,000; Full time

Job summary

Hudson Manpower is seeking a Senior/Advanced Java Developer to support a newly established team working on an Omnichannel Payment Platform (OPP) and a new POS system. The consultant will help stabilize the POS environment and integrate it with the OPP platform.

The ideal candidate will bring hands-on Java, Spring, REST APIs, and backend microservices experience, plus expertise with API Gateways, PCI/security-sensitive environments, and POS integrations.

Qualifications

• 7+ years of senior-level Java development experience.
• Strong hands-on Java, Spring, and Spring Boot expertise.
• Experience building RESTful APIs and backend microservices.
• Experience with API Gateway and enterprise integrations.
• Hands-on POS experience with POS terminals or related test environments.
• Experience in PCI-scoped, payment, financial, or security-sensitive environments.
• Ability to work onsite with cross-functional technical teams.

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.

Skills

Java

Spring / Spring Boot

REST APIs

API Gateway

Microservices

POS Integration

PCI / Secure Development

Job description

Hudson Manpower is seeking a Senior/Advanced Java Developer to support a newly established team working on an Omnichannel Payment Platform (OPP) and a new POS system. The consultant will help stabilize the POS environment and integrate it with the OPP platform.

The ideal candidate will bring hands-on Java, Spring, REST APIs, and backend microservices experience, plus expertise with API Gateways, PCI/security-sensitive environments, and POS integrations.