Senior API Engineer - Real-Time Fraud Platform

Mastercard

Rathcoole

On-site

EUR 90,000 - 130,000

Full time

3 days ago

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Job summary

Mastercard is seeking a Senior Software Engineer (API) for its Dublin-based engineering team working on a real-time decisioning platform. You will help design, build and operate a high-performance, in-memory data caching layer that supports global transaction processing with low latency, high availability and resiliency.

This hands-on role involves end-to-end ownership, mentoring teammates, and shaping technical direction within an Agile team.

Qualifications

Strong proficiency with modern Java (JDK 17 or later) and distributed systems.
Experience with Spring, Spring Boot, Hibernate, RESTful APIs, JSON; application servers (JBoss/Tomcat); Shell scripting.
Experience with distributed caching or in-memory data grid technologies (e.g. Apache Geode, Hazelcast, Redis, Coherence).
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.

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.