Senior Java Engineer for Real-Time Fraud Platform

Mastercard; Lusk (WY); On-site; USD 101,000 - 146,000; Full time

Job summary

Mastercard is seeking a Senior Software Engineer (API) to join a Dublin-based team building a real-time decisioning platform. You will own complex features from design to deployment, focusing on high‑performance Java services, distributed caching, and secure API design.

The role emphasizes end‑to‑end ownership in a collaborative Agile environment. You will work on a high‑scale system that powers mission‑critical transactions, with opportunities to mentor others and influence technical direction

Qualifications

• Proven experience with modern Java and distributed systems.
• Experience with Spring, Hibernate and RESTful APIs.
• Knowledge of in-memory data grids and caching.
• Strong Linux, SQL and messaging background.
• Automated testing with JUnit and test plans.
• CI/CD tooling such as Jenkins and Maven.
• Familiarity with observability tools and dashboards.
• Awareness of PCI‑DSS in secure software development.
• Experience with SAFe/SCRUM Agile methods.

Responsibilities

• Own end-to-end delivery of features across software lifecycle.
• Design high-performance, secure Java capabilities and APIs.
• Troubleshoot multi‑tier systems and perform root‑cause analysis.
• Lead code reviews, standards and framework adoption.
• Coordinate releases across regions and manage roll‑outs.
• Participate in on‑call support and incident remediation.
• Mentor engineers and share knowledge across the team.
• Drive automation of build, run, and operating activities.

Skills

Java

Spring

Hibernate

REST APIs

JSON

Distributed caching

Linux

SQL

Messaging

JUnit

CI/CD

Jenkins

Maven

Observability

Security best practices

Agile/Scrum

Education

Bachelor's degree in Computer Science

Tools

JBoss/Tomcat

Shell scripting

Job description

Mastercard is seeking a Senior Software Engineer (API) to join a Dublin-based team building a real-time decisioning platform. You will own complex features from design to deployment, focusing on high‑performance Java services, distributed caching, and secure API design.

The role emphasizes end‑to‑end ownership in a collaborative Agile environment. You will work on a high‑scale system that powers mission‑critical transactions, with opportunities to mentor others and influence technical direction