Senior Java Engineer — Real-Time Fraud API Platform

Mastercard; Dundrum; On-site; EUR 90,000 - 135,000; Full time

Job summary

Mastercard in Dublin is seeking a Senior Java Software Engineer to join a real-time decisioning platform. You will own end-to-end delivery of high-performance distributed systems and help shape technical direction within an Agile team.

The role emphasizes in-memory caching, low latency, and reliability at global scale, with mentoring responsibilities and close collaboration with Product, Security and Operations teams.

Qualifications

• Proven experience designing and implementing distributed, low-latency Java services.
• Strong understanding of API design, security, and scalable architectures.
• Hands-on with testing strategies across unit/integration levels.

Responsibilities

• Own complex features across full SDLC from architecture to deployment.
• Design high-performance, scalable Java capabilities and APIs.
• Debug and troubleshoot multi-tier systems; improve resilience.
• Lead code reviews and promote coding standards.
• Coordinate releases across multi-region teams.
• Participate in on-call support and incident analysis.
• Engage with Product Owners; communicate status and risks.
• Mentor engineers and share knowledge.
• Pursue continuous improvement and evaluate new technologies.

Skills

Java (JDK 17+)

Spring Boot

Distributed systems

RESTful APIs

JUnit/testing

CI/CD (Jenkins, Maven)

Linux/SQL

Education

Bachelor's degree in Computer Science or equivalent

Tools

Geode / Hazelcast / Redis

Job description

Mastercard in Dublin is seeking a Senior Java Software Engineer to join a real-time decisioning platform. You will own end-to-end delivery of high-performance distributed systems and help shape technical direction within an Agile team.

The role emphasizes in-memory caching, low latency, and reliability at global scale, with mentoring responsibilities and close collaboration with Product, Security and Operations teams.