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# Senior Java API Integration Engineer

- **Company:** Cognizant Technology Solutions Corporation
- **Location:** Buffalo, NY, United States
- **Experience:** Expert
- **Salary:** $81,337.0 - $136,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), User Authentication, IBM DB2, Database Queries, JSON, OAuth, Swagger, Systems Integration, Web Services, Web Services Description Language, Z/OS, Openapi, Spring-boot, SOAPAPI, Api Gateway, Webhooks, Api Management
- **Published:** August 19, 2026
- **Apply:** https://www.techcareers.com/job.asp?id=3358942315&tx=KJ9999FFU&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54

## About the Role

* 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.

These will help you stand out

 * 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.

## Description

As a Java API Integration Engineer, you will make an impact by designing, developing, and supporting secure integrations that enable customer onboarding, ACH origination, transaction inquiries, and payment-status tracking. You will be a valued member of the technology team and collaborate with business, operations, risk, fraud, infrastructure, and vendor stakeholders., * 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.


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