Senior Java Engineer — Real-Time Fraud Platform

Mastercard; Leixlip; On-site; EUR 110,000 - 140,000; Full time

Job summary

Mastercard is seeking a Senior Java Software Engineer to join our Dublin engineering team working on a real-time decisioning platform. You will contribute to a high-performance, distributed in-memory data caching layer that supports global transaction processing with low latency, high availability and resiliency.

This hands-on role requires end-to-end ownership of features, mentoring teammates, and guiding technical direction within an Agile team.

Qualifications

• Strong proficiency with modern Java (JDK 17+) and distributed systems.
• Experience with Spring, RESTful APIs, and SQL databases.
• Experience with caching/in-memory data grids desirable.
• CI/CD and testing expertise.
• Awareness of secure development practices (PCI-DSS) and security fundamentals.

Responsibilities

• End-to-end delivery — Own complex features and services across the full software development lifecycle.
• Design & innovation — Design high-performance, scalable Java capabilities and APIs.
• Independent problem-solving — Debug and troubleshoot across multi-tiered systems.
• Technical leadership — Review code, tests and drive coding standards.
• Release & delivery coordination — Support coordinated releases across regions.
• Operational excellence — Participate in on-call support and incident response.
• Stakeholder engagement — Collaborate with Product Owners and cross-teams.
• Mentoring & knowledge sharing — Guide less-experienced engineers.
• Continuous improvement — Drive automation and evaluate new technologies.

Skills

Java

Distributed systems

Spring / Spring Boot

RESTful APIs

Linux / SQL

JUnit / Testing

CI/CD

Observability

Security awareness

Agile / SAFe

Education

Bachelor's degree in Computer Science or equivalent

Job description

Mastercard is seeking a Senior Java Software Engineer to join our Dublin engineering team working on a real-time decisioning platform. You will contribute to a high-performance, distributed in-memory data caching layer that supports global transaction processing with low latency, high availability and resiliency.

This hands-on role requires end-to-end ownership of features, mentoring teammates, and guiding technical direction within an Agile team.