Senior Software Engineer responsible for development-first quality engineering: build scalable backend systems, design and implement API/UI test automation, enhance CI/CD pipelines, drive shift-left testing, contribute to architecture, performance, security, observability, and troubleshoot distributed systems to ensure high reliability.
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
We are seeking a Senior Software Engineer - Automation Developer with deep expertise in test automation, quality engineering, and backend systems. This role is ideal for an engineer who is passionate about building scalable automation solutions, improving software quality, and driving engineering excellence across the development lifecycle.
The successful candidate will be responsible for designing, developing, and maintaining robust automation frameworks, enabling continuous quality practices, and partnering closely with development teams to ensure the delivery of high-quality, reliable software solutions.
Key Responsibilities
Design, develop, and maintain scalable automation frameworks for UI, API, and end-to-end testing.
Drive automation strategy and implementation using modern test automation tools and best practices.
Develop reliable, maintainable, and reusable test automation solutions integrated into CI/CD pipelines.
Collaborate with software engineers, product owners, and architects to improve product quality and testability.
Participate in requirement reviews, design discussions, and technical solutioning with a quality-first mindset.
Analyze application architecture and backend services to create effective validation strategies.
Support troubleshooting, root cause analysis, and defect prevention activities.
Champion engineering excellence, automation-first thinking, and continuous improvement across the team.
Automation Engineering (Primary Focus)
Strong hands-on experience developing and maintaining automation frameworks using:
Playwright
Selenium WebDriver
Java
JUnit and/or TestNG
Proven experience implementing UI, API, integration, and end-to-end automation solutions.
Strong understanding of test automation architecture, design patterns, and framework development.
Experience developing reusable libraries, utilities, and automation components.
Experience integrating automated tests into CI/CD pipelines and release processes.
Ability to establish automation quality gates and reporting metrics.
Backend & API Validation
Strong understanding of backend application architecture and distributed systems.
Experience testing and automating RESTful APIs and microservices.
Hands-on experience with:
REST APIs
JSON/XML payload validation
API Automation Frameworks
Database validation using SQL
Ability to analyze logs, traces, and backend processes to identify defects and validate business workflows.
Experience validating end-to-end application flows across UI, middleware, and backend systems.
Corporate Security Responsibility
All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:
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
We are seeking a Senior Software Engineer - Automation Developer with deep expertise in test automation, quality engineering, and backend systems. This role is ideal for an engineer who is passionate about building scalable automation solutions, improving software quality, and driving engineering excellence across the development lifecycle.
The successful candidate will be responsible for designing, developing, and maintaining robust automation frameworks, enabling continuous quality practices, and partnering closely with development teams to ensure the delivery of high-quality, reliable software solutions.
Key Responsibilities
Design, develop, and maintain scalable automation frameworks for UI, API, and end-to-end testing.
Drive automation strategy and implementation using modern test automation tools and best practices.
Develop reliable, maintainable, and reusable test automation solutions integrated into CI/CD pipelines.
Collaborate with software engineers, product owners, and architects to improve product quality and testability.
Participate in requirement reviews, design discussions, and technical solutioning with a quality-first mindset.
Analyze application architecture and backend services to create effective validation strategies.
Support troubleshooting, root cause analysis, and defect prevention activities.
Champion engineering excellence, automation-first thinking, and continuous improvement across the team.
Automation Engineering (Primary Focus)
Strong hands-on experience developing and maintaining automation frameworks using:
Playwright
Selenium WebDriver
Java
JUnit and/or TestNG
Proven experience implementing UI, API, integration, and end-to-end automation solutions.
Strong understanding of test automation architecture, design patterns, and framework development.
Experience developing reusable libraries, utilities, and automation components.
Experience integrating automated tests into CI/CD pipelines and release processes.
Ability to establish automation quality gates and reporting metrics.
Backend & API Validation
Strong understanding of backend application architecture and distributed systems.
Experience testing and automating RESTful APIs and microservices.
Hands-on experience with:
REST APIs
JSON/XML payload validation
API Automation Frameworks
Database validation using SQL
Ability to analyze logs, traces, and backend processes to identify defects and validate business workflows.
Experience validating end-to-end application flows across UI, middleware, and backend systems.
Corporate Security Responsibility
All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:
- 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.
Mastercard London, England Office
Mastercard London, UK Office
1 Angel Lane, London, United Kingdom, EC4R 3AB
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