Job Title:

Senior Software Engineer (SDET)-1

Overview:

Our team is seeking a Senior Software Engineer in Test to join our brand-new Platform Resiliency team to help us build more resilient systems by proactively uncovering weaknesses in our infrastructure and applications. In this role, you will blend your software development skills with quality engineering best practices within Mastercard to design, implement, and execute automated test strategies that simulate failure and stress conditions across distributed systems.

We’re looking for someone with a passion for innovation—a builder who’s excited to experiment, push boundaries, and evolve how we think about reliability at scale. Your work will directly impact the stability of our core platforms and help shape the future of resiliency testing across organizations.

This is a hybrid position based in Budapest, Hungary, requiring three days per week onsite.


Role:

Design and build scalable software platforms and tooling for performance, end-to-end, and other forms of comprehensive testing.

Champion engineering best practices by developing and integrating automated tests into CI/CD pipelines—driving platform hardening and fast feedback loops

Explore opportunities to incorporate cutting-edge AI tools to increase efficiency across the SDLC

Contribute to the design and evolution of our resiliency testing framework, including integration with monitoring and observability tools.

Lead root cause analysis and post-incident testing to validate fixes and prevent regression

Be comfortable collaborating across large enterprises

Collaborate with DevOps, platform engineers, and application teams to implement fault tolerance and measure system response across domains

Support operational excellence by improving platform reliability, scaling, and maintainability using data and metrics.

Ensure platform security and compliance, while balancing speed of delivery and long-term maintainability.

Drive continuous improvement in the software development lifecycle, ensuring alignment with our technical and business strategies.


All about you:

A background in software testing, strong technical skills in automation, testing, and performance testing.

Proficiency in programming languages like Java, Python, or Clojure, especially for tool development.

Experience with end-to-end testing of multi-tier REST APIs and UIs.

Solid understanding of modern web development (e.g., React, Angular, NodeJS, GraphQL).

Deep expertise in testing strategies, frameworks, and automation tools for multi-tier REST APIs and UIs.

Passionate about driving innovation in the testing space through AI-powered testing strategies.

Expertise with CI/CD pipelines, using tools such as Jenkins, GitHub Actions, or similar.

Solid understanding of distributed systems, microservices architecture, and cloud-native platforms (e.g: Kubernetes, AWS, GCP)

Proven ability to work collaboratively across global teams, navigating cultural and time zone differences effectively.

Familiarity with monitoring and observability tools (e.g., Prometheus, Grafana, Splunk, Datadog).

Bachelor's degree in computer science, Software Engineering, or a related field (or equivalent practical experience).


Why Join Us:

Play a key role in shaping a new engineering initiative at the intersection of platform resiliency and product development.

Drive test strategy, automation, and resilience standards that influence how teams across the organization build and operate reliable systems.

Be part of a culture that values quality, innovation, and continuous improvement—with the chance to make a visible impact on systems that help combat fraud at a global scale

Competitive compensation, flexible work environment, and the opportunity to work on systems that combat fraud.To find US Salary Ranges, visit People Place. Under the Compensation tab, select "Salary Structures." Within the text of "Salary Structures," click on the link "salary structures 2025," through which you will be able to access the salary ranges for each Mastercard job family. For more information regarding US benefits, visit People Place and review the Benefits tab and the Time Off & Leave tab.