Senior SDET - AI-Powered Test Architect

Mastercard; Swords; On-site; EUR 90,000 - 120,000; Full time

Job summary

Mastercard in Ireland is seeking a Senior Software Development Engineer in Test (SDET) to build and assure the next generation of intelligent, agentic testing platforms. This hands-on role requires strong automation expertise and a track record of testing AI‑powered systems in production environments.

You will own end‑to‑end quality for AI-driven workflows, APIs, and UIs, design scalable automation strategies, and collaborate with cross‑functional teams to raise the engineering bar and ensure

Qualifications

• Strong experience in software test automation, automation framework design, and code quality practices.
• Proven ability to test modern distributed systems, APIs, event‑driven architectures, and user‑facing applications.
• Experience validating AI‑enabled or agentic applications, including prompt/workflow validation, output quality assessment, and scenario‑based testing.
• Strong understanding of Agile development, shift‑left testing, continuous integration, and continuous delivery.
• Comfortable working across ambiguity and applying innovative thinking to solve new and evolving quality challenges.

Responsibilities

• Own end-to-end quality engineering for agentic applications, intelligent workflows, APIs, user interfaces, and supporting platform services.
• Design, develop, and maintain robust automation frameworks for UI, API, integration, regression, and system‑level testing.
• Define test strategies for AI and agent‑based systems, including workflow validation, response quality, tool usage, guardrails, reliability, and failure handling.
• Build automated quality gates for CI/CD pipelines and ensure high‑confidence releases through continuous testing.
• Partner closely with software engineers, product managers, architects, and data/AI teams to ensure quality is built in from design through production.
• Create meaningful test data, validate edge cases, identify defects early, and drive root cause analysis through to resolution.
• Evaluate non‑functional characteristics such as performance, reliability, observability, resilience, and scalability.
• Contribute innovative ideas that improve testability, developer productivity, release confidence, and engineering effectiveness.

Skills

Java

Python

Automation

UI automation

APIs

Tools

Playwright

Selenium

Cypress

REST Assured

Job description

Mastercard in Ireland is seeking a Senior Software Development Engineer in Test (SDET) to build and assure the next generation of intelligent, agentic testing platforms. This hands-on role requires strong automation expertise and a track record of testing AI‑powered systems in production environments.

You will own end‑to‑end quality for AI-driven workflows, APIs, and UIs, design scalable automation strategies, and collaborate with cross‑functional teams to raise the engineering bar and ensure