Senior Backend API Developer - 3702514

Lighthouse Technology Services • Buffalo, NY

6d • Hybrid

About The Position

Lighthouse Technology Services is partnering with a client to hire a Senior Backend API Developer for a 12–18 month contract opportunity. The role is hybrid in Buffalo, NY, with four days on-site each week. The employee will work as a W-2 employee of Lighthouse Technology Services; C2C and subcontracting arrangements will not be considered.

The developer will build and maintain enterprise APIs supporting money movement applications across banking systems. The role includes integrating APIs with mainframes and external banks using ACH protocols, migrating on-premise services and infrastructure to Azure, and supporting production systems through troubleshooting, defect resolution, and performance optimization. The developer will also enhance an existing backend API codebase, conduct integration and REST API testing, troubleshoot SQL Server transaction databases, and collaborate with teams supporting money movement, job scheduling, and downstream account services. Participation in code reviews and improvement of API architecture are also part of the position.

Requirements

• At least 5 years as a Senior Backend Developer.
• Proven REST API design and implementation experience.
• Intermediate-to-expert proficiency in Java development.
• Solid experience building APIs with the Spring Boot framework.
• Intermediate-level SQL Server skills, including querying, testing, and troubleshooting transaction data.
• Expertise testing REST APIs with Postman for validation and integration scenarios.
• Strong integration testing experience across complex, multi-system environments.

Nice To Haves

• Experience with the Azure cloud platform; highly preferred for this migration-focused role.
• Background in banking or financial services environments; a strong advantage but not required.

Responsibilities

• Develop and maintain enterprise APIs that enable money movement applications across banking systems.
• Build and support API integrations with mainframes and external banks via ACH protocols.
• Lead migration efforts moving on-premise services and infrastructure to Azure cloud.
• Support production systems through troubleshooting, defect resolution, and performance optimization.
• Implement incremental functionality and enhancements to the existing backend API codebase.
• Conduct integration testing and REST API testing using Postman.
• Query and troubleshoot SQL Server transaction databases to verify and debug money movement flows.
• Collaborate with the Money Movement team, job scheduling teams, and downstream account service groups.
• Participate in code reviews and contribute to continuous improvement of API architecture.

What This Job Offers

• Career Level: Senior
• Education Level: No Education Listed