Advanced Software Engineer Level 3

Job Title: Advanced Software Engineer Level 3
Location: Blue Ash, OH 45242
Position Type: Contract

Job Description
We are seeking an Advanced Software Engineer to join a newly established team supporting the Omnichannel Payment Platform (OPP) and a new Point-of-Sale (POS) system. This senior-level consultant will play a critical role in stabilizing the new POS environment and integrating it with OPP.

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 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 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, 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 OPP/POS team.

Notes To Vendors
Senior-level experience developing enterprise Java applications.
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 working directly with POS terminals or related test environments.
Experience working in PCI-scoped, payment, financial, or other security-sensitive environments.
Ability to work effectively onsite with cross-functional technical teams.

Technology Stack Required:
Java, Spring, Spring Boot, REST APIs, API Gateway, Microservices, POS Integration, PCI/Secure Development Practices

Preferred:
Kafka, Event-Driven Architecture, Payment Systems, CI/CD, Cloud, Containers
NO SQL