Senior Java Developer — Fiserv in Nenagh
We are hiring a Senior Java Developer to join our engineering team at Fiserv in Nenagh. We build robust, scalable payment and financial software used by clients globally. As a senior engineer you will design and deliver high-quality services, mentor colleagues, and help shape technical direction
What you’ll Do
Design, build and maintain Java-based services and microservices using Spring (Boot, Cloud) and RESTful API
Deliver clean, well-tested code using TDD/BDD practices and automated CI/CD pipeline
Lead architecture and design discussions for scalability, performance and resilience
Troubleshoot production issues, perform performance tuning and implement monitoring/observability
Collaborate closely with product owners, QA, DevOps and other engineering teams in an Agile environment
Review code, mentor mid/junior engineers, and promote best practices for security and software quality
Contribute to technical roadmaps, continuous improvement and platform hardening effort
What You'll Have
8+ years hands-on Java development experience, with modern Java versions (Java 8+)
Strong experience with Spring Framework (Spring Boot) and building microservice
Proven experience with REST APIs, cloud-native architectures and container technologies (Docker; Kubernetes experience desirable
Solid knowledge of relational databases (SQL) and familiarity with NoSQL stores
Experience with CI/CD tools (Jenkins, GitLab CI, Azure DevOps or similar) and automated testing frameworks (JUnit, Mockito)
Strong debugging, profiling and performance tuning skills
Experience working in Agile/Scrum teams and collaborating with cross-functional stakeholders
Excellent communication skills and ability to mentor others
Bachelor’s degree in Computer Science, Engineering or equivalent practical experience
Nice to have
Experience in payments, banking or financial services
Familiarity with cloud platforms (AWS, Azure or GCP)
Knowledge of message-driven architectures (Kafka, Rabbit MQ)
Security and compliance awareness relevant to financial systems
Experience with observability tooling (Prometheus, Grafana, ELK)
About us We are Partners in Possibility — progressive, engaged and straightforward. At Fiserv in Nenagh we deliver technology that helps clients and communities move forward. If you’re motivated by solving hard problems and helping teams succeed, we want to hear from you