Senior API Engineer – Real-Time Fraud Platform

Mastercard Inc.; Ashbourne; On-site; EUR 90,000 - 120,000; Full time

Job summary

Mastercard Inc. in Dublin, Ireland, is looking for a Senior Java Software Engineer to join a real-time decisioning platform. You will own complex features across the full software lifecycle in a high‑performing distributed system environment.

You will design scalable Java capabilities, implement API standards, and mentor colleagues while supporting release coordination in a global, secure payments context.

Qualifications

• Strong proficiency with modern Java (JDK 17+) and distributed systems.
• Experience with Spring, Spring Boot, Hibernate, RESTful APIs and related tech.
• Solid Linux skills, SQL and messaging/queuing systems.
• Experience with automated testing (JUnit or equivalent) and test plans across multiple levels.
• CI/CD tooling and processes ( Jenkins, Maven ) and source control in distributed environments.
• Familiarity with observability, monitoring tools and dashboards for performance insights.
• Secure development practices (PCI-DSS) and awareness of payment data handling.
• Agile ways of working (SAFe/SCRUM), code quality and engineering best practices.

Responsibilities

• Own complex features and services across the full software development lifecycle.
• Design high-performance, scalable Java capabilities and clear API designs; document designs.
• Troubleshoot across multi-tier systems; implement resilient solutions.
• Lead code, design and process trade-off discussions; promote coding standards.
• Coordinate releases across a follow-the-sun model with cross-team sign-offs.
• Participate in on-call support; drive incident management and root-cause analysis.
• Engage with Product Owners to prioritise work and demonstrate progress.
• Mentor less-experienced engineers and share knowledge across the team.
• Investigate new technologies and drive automation of build, operate and run activities.

Skills

Java 17+

Distributed systems

Spring & Hibernate

RESTful APIs

SQL

Linux

JUnit

CI/CD

Jenkins

Maven

Observability/Monitoring

PCI-DSS

SAFe / SCRUM

Education

Bachelor's degree in Computer Science, Information Technology or equivalent

Tools

Apache Geode

Hazelcast

Redis

Coherence

Job description

Mastercard Inc. in Dublin, Ireland, is looking for a Senior Java Software Engineer to join a real-time decisioning platform. You will own complex features across the full software lifecycle in a high‑performing distributed system environment.

You will design scalable Java capabilities, implement API standards, and mentor colleagues while supporting release coordination in a global, secure payments context.