Senior Java API Integration Engineer

About the role

Design, develop, and support secure integrations that enable customer onboarding, ACH origination, transaction inquiries, and payment-status tracking. Collaborate with business, operations, risk, fraud, infrastructure, and vendor stakeholders as a valued member of the technology team.

Responsibilities

• Implement and integrate Fiserv PEP+ Direct APIs for customer onboarding, ACH origination, inquiries, and status tracking.
• Develop and maintain REST and SOAP API integrations using JSON, WSDL, and OpenAPI/Swagger.
• Support ACH exception, return, investigation, and reconciliation processes.
• Participate in technical design, testing, implementation, deployments, and production support.
• Troubleshoot integration and operational issues, identify root causes, and coordinate timely resolution.
• Support API gateways, secure service-to-service communication, API publishing, subscriptions, token management, and webhooks.
• Collaborate with business and technology teams to deliver reliable payment solutions.

Requirements

• Hands-on experience implementing banking or payment-service API integrations.
• Strong Java and Spring Boot development experience.
• Experience developing and integrating REST and SOAP APIs using JSON, WSDL, and OpenAPI/Swagger.
• Knowledge of API gateways, API publishing, subscriptions, and secure service-to-service communication.
• Experience with OAuth 2.0, TLS/mTLS, certificates, tokens, and secure authentication practices.
• Experience developing webhooks or event-driven integrations.
• Strong SQL skills and experience supporting financial-services applications.
• Professional experience working in banking or financial services.

Nice-to-have skills

• Experience implementing or integrating Fiserv PEP+ or PEP+ Direct.
• Experience integrating with mainframe platforms, including z/OS and DB2 for z/OS.
• Knowledge of Treasury Management or embedded-banking solutions.
• Understanding of ACH processing, NACHA rules, credits, debits, returns, NOCs, and CCD and CTX transaction types.
• Experience supporting ACH onboarding, origination, warehouse inquiries, payment-status workflows, exceptions, reconciliation, and fraud controls.
• Experience providing production support in regulated or high-volume payment environments.

Schedule

Hybrid position requiring three days per week onsite and two days remote in Buffalo, New York.

Pay

Annual salary range: $81,337 to $136,000, depending on experience and qualifications. Eligible for Cognizant’s discretionary annual incentive program, based on performance.

Benefits

• Medical, dental, and vision coverage.
• Paid time off and holidays.
• 401(k) contributions.
• Disability coverage.
• Parental leave.
• Employee stock purchase plan.

Location: Buffalo, New York. This position is not eligible for visa transfer or sponsorship, now or in the future.