Senior Java Developer – Fiserv OmniPay

Location: Dublin, Ireland

Duration: 12+ Months

We are looking for a Senior Java Developer to work on Fiserv OmniPay, a global multi‑currency, multi‑country acquiring platform known for its scalable, secure, and functionally rich payment processing capabilities.

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• Develop and maintain Java 8/11+ backend services for OmniPay’s acquiring and payment processing modules.
  
• Build and optimize Spring Boot microservices aligned with OmniPay’s high‑performance switching and processing flows.
  
• Design and implement RESTful APIs for merchant acquiring, settlements, reporting, and risk-related integrations.
  
• Work with messaging systems (Kafka/RabbitMQ) for real‑time transaction processing pipelines.
  
• Build robust data access layers using SQL and NoSQL databases to support OmniPay’s reporting and analytics needs.
  
• Collaborate with cross‑functional teams integrating with Fiserv’s Payments, Fraud, and Disputes APIs.
  

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• 5+ years hands‑on experience in Java (Java 8/11+).
  
• Strong expertise in Spring Boot, Microservices, REST APIs.
  
• Good understanding of messaging systems (Kafka/RabbitMQ).
  
• Experience with SQL (Oracle/MySQL/PostgreSQL) and NoSQL (MongoDB/Cassandra/Redis). xcfaprz
  
• Exposure to payment systems, card processing, or acquiring platforms is a strong plus—OmniPay supports global acquirer processing across geographies.