Senior Software Engineer (API) - Fraud Platform

Mastercard; Maynooth; On-site; EUR 85,000 - 120,000; Full time

Job summary

Mastercard in Dublin, Ireland, is seeking a Senior Java Software Engineer to join a Dublin-based engineering team working on a real-time decisioning platform. The role focuses on a high-performance, distributed, in-memory data caching layer for global transaction processing with low latency and high availability.

This hands-on senior position requires ownership of features end-to-end, mentorship of colleagues, and collaboration within an Agile team to shape technical direction.

Qualifications

• Strong Java development experience (JDK 17 or later) with distributed systems knowledge.
• Experience with Spring, Hibernate, RESTful APIs and modern API design.
• Proficiency in Linux, SQL and messaging systems; familiarity with testing frameworks.
• Exposure to CI/CD tools and automated testing practices; JUnit experience.
• Understanding of secure development practices and PCI-DSS considerations.
• Excellent communication and collaborative, Agile/Scrum mindset.

Responsibilities

• Own end-to-end delivery of complex features across the software lifecycle.
• Design high-performance, scalable Java capabilities and secure APIs.
• Troubleshoot across multi-tiered systems including heap and thread analysis.
• Lead code and design discussions; enforce coding standards and reviews.
• Coordinate releases across a multi-region engineering model.
• Participate in on-call support and drive incident remediation.
• Mentor engineers and share knowledge across the team.
• Identify automation opportunities to improve build, run and release.

Skills

Java

Spring

Hibernate

REST APIs

SQL

Linux

CI/CD

JUnit

Education

Bachelor's degree in Computer Science

Tools

Apache Geode

Hazelcast

Redis

Coherence

Job description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Senior Software Engineer (API) - Fraud Platform

SENIOR SOFTWARE ENGINEER (JAVA) - DATA CACHING / DISTRIBUTED SYSTEMS

Location: Dublin, Ireland

OVERVIEW

We are hiring a Senior Java Software Engineer to join a Dublin-based engineering team working on Mastercard's real-time decisioning platform. The team designs, builds and operates a high-performance, distributed, in-memory data caching layer that supports mission-critical transaction processing at global scale, with a strong focus on low latency, high availability and resiliency.

This is a hands-on senior role for an engineer who enjoys working close to complex distributed systems, owning features end-to-end, and helping shape technical direction within a collaborative Agile team.

• Want to work on industry-leading, mission-critical distributed systems at global scale?
• Motivated by solving complex performance, resiliency and data-consistency problems?
• Keen to take end-to-end ownership and mentor others in a high-trust team?

ROLE & KEY RESPONSIBILITIES

• End-to-end delivery - Own complex features and services across the full software development lifecycle: architecture, design, development, testing, deployment, rollback planning and documentation.
• Design & innovation - Design and implement high-performance, scalable and secure Java capabilities; apply advanced design patterns and API standards; produce high- and low-level design documentation to a professional standard.
• Independent problem-solving - Drive solutions for complex problems; debug and troubleshoot across multi-tiered systems, including core, heap and thread-dump analysis; design resilient solutions.
• Technical leadership & influence - Lead code, design and process trade-off discussions; drive adoption of coding standards and frameworks; review code, tests and automation produced by other team members.
• Release & delivery coordination - Support coordinated releases across a follow-the-sun, multi-region engineering model, including scope tracking, cross-team sign-offs and release execution.
• Operational excellence - Participate in on-call support; lead incident management, root-cause analysis and remediation; proactively improve performance and stability metrics.
• Stakeholder engagement - Contribute to prioritisation with Product and Business stakeholders; lead demos and acceptance discussions with Product Owners; report status and manage risks in owned service areas.
• Mentoring & knowledge sharing - Mentor less-experienced engineers, deliver knowledge-transfer and brown-bag sessions, and help build shared understanding across the team.
• Continuous improvement - Identify inefficiencies and drive automation of build, operate and run activities; research and evaluate emerging technologies and frameworks.

REQUIRED SKILLS & EXPERIENCE

• Strong proficiency with modern Java (JDK 17 or later); distributed systems and multi-threading experience.
• Experience with Spring, Spring Boot, Hibernate, RESTful APIs, JSON; application servers (e.g. JBoss/Tomcat); Shell scripting.
• Experience with distributed caching or in-memory data grid technologies (e.g. Apache Geode, Hazelcast, Redis, Coherence) is highly desirable.
• Solid experience with Linux, SQL and message-queuing systems, and with design patterns.
• Expertise in JUnit or equivalent automated testing frameworks; designing test plans across unit, regression, performance and integration.
• CI/CD proficiency - tools such as Jenkins and Maven; source control in a multi-developer, distributed environment.
• Familiarity with observability and monitoring tooling for alerting, dashboards and performance analysis.
• Understanding of secure development practices (secure-by-design) and awareness of PCI-DSS considerations for handling payment card data.
• Passionate about Agile ways of working (SAFe / SCRUM), code quality and engineering best practices.

OTHER ATTRIBUTES

• Excellent written and verbal communication and strong cross-team, cross-geography collaboration.
• Shows initiative, takes on challenging opportunities, and demonstrates end-to-end ownership.
• Driven, highly motivated, strong team player. Fluency in English.

EDUCATION

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

Corporate Security Responsibility

• Abide by Mastercard's security policies and practices;
• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.