Senior Backend API Developer

Lighthouse Technology Services is partnering with our client to fill their Senior Backend API Developer position! This is a 12-18 month contract opportunity and will be hybrid in Buffalo, NY with 4 days on-site. This role will be a W2 employee of Lighthouse Technology Services. No C2C or subcontracting arrangements will be considered.

• 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 environment
• Support production systems through troubleshooting, defect resolution, and performance optimization
• Implement incremental functionality and enhancements to existing backend API codebase
• Conduct integration testing and REST API testing using Postman to ensure reliability
• Query and troubleshoot SQL Server transaction databases to verify and debug money movement flows
• Collaborate with Money Movement team, job scheduling teams, and downstream account service groups
• Participate in code reviews and contribute to continuous improvement of API architecture

• 5+ years as a Senior Backend Developer with proven REST API design and implementation experience
• Strong proficiency in Java development at an intermediate to expert level
• Solid experience building APIs with Spring Boot framework
• Intermediate-level SQL Server skills including querying, testing, and troubleshooting transaction data
• Demonstrated expertise testing REST APIs with Postman for validation and integration scenarios
• Strong integration testing experience across complex, multi-system environments
• Experience with Azure cloud platform (highly preferred for this migration-focused role)
• Background in banking or financial services environments (strong advantage but not required)

Pay Range: $70-77+/hr