Senior Software Engineer (2)
Confirmed on the employer's own hiring board on Sep 24, 2026. First seen by Alion on Aug 25, 2026. Hudson Manpower scores A on the Alion truth index.
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.
Requirements
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.