Senior Backend API Developer - 3702514

Lighthouse Technology Services; Buffalo (NY); Hybrid; USD 96,000 - 106,000; Part time

Job summary

Lighthouse Technology Services, Inc. is seeking a Senior Backend API Developer for a 12-18 month contract in Buffalo, NY.

The role is hybrid with 4 days on-site, and involves developing enterprise APIs for money movement, integrating with mainframes and external banks via ACH, and leading migration of on-prem services to Azure. Qualified candidates will have 5+ years in backend development, strong Java/Spring Boot experience, SQL Server proficiency, and hands-on API testing with Postman.

Qualifications

• 5+ years as a Senior Backend Developer with REST API design and implementation experience.
• Proficient Java development with Spring Boot and API design.
• Experience querying and troubleshooting SQL Server databases.
• Experience testing REST APIs with Postman for integration scenarios.
• Able to contribute to Azure cloud migration projects; banking/financial services background is a plus.

Responsibilities

• Develop and maintain enterprise APIs enabling money movement across banking systems.
• Build and support API integrations with mainframes and external banks via ACH protocols.
• Lead migration efforts moving on-premise services to Azure.
• Support production systems through troubleshooting, defect resolution, and performance optimization.
• Implement incremental functionality and enhancements to backend API codebase.
• Conduct integration testing and REST API testing using Postman.
• Query and troubleshoot SQL Server transaction data for money movement flows.
• Collaborate with Money Movement and downstream service teams; participate in code reviews.

Skills

REST API design

Java

Spring Boot

SQL Server

API testing

Tools

Postman

Azure

Job description

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.

What You'll Be Doing:

• 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

What You'll Need to Have:

• 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