Senior Software Engineer, Mastercard
User Interface
Global payments technology company
Be an early applicant
Global payments technology company
1001+ employees
Be an early applicant
1001+ employees
Company mission
To connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible.
Role
Who you are
- Must be detail-oriented, proactive, and able to function under pressure in a delivery-focused environment
- Demonstrates high ownership and strong follow-through; comfortable taking work from concept to production
- Possesses strong communication skills—both verbal and written—and strong collaborative/relationship-building skills
- Comfortable working in a matrixed, diverse, and geographically distributed team
- Deep understanding of modern software delivery practices including Agile and test-driven development
- Strong proficiency in React with TypeScript (functional components, hooks, composition patterns)
- Solid understanding of HTML5, CSS3, responsive design, and modern styling approaches (CSS Modules, CSS-in-JS, Tailwind or equivalent)
- Experience with state management and data-fetching patterns (Context, Redux Toolkit, Zustand, React Query/SWR or equivalent)
- Strong testing discipline: Jest/Vitest, React Testing Library, and end-to-end testing (Cypress/Playwright)
- Production experience with build tooling and performance optimization (Vite/Webpack, code-splitting, bundle analysis, lazy loading)
- Experience integrating with APIs (REST and/or GraphQL), handling async flows, and implementing robust client-side error handling
- CI/CD familiarity for front-end apps (pipelines, quality gates, automated tests, artifact builds, environment promotion)
- Accessibility fundamentals (semantic HTML, keyboard navigation, ARIA usage) and commitment to inclusive UX
- Typically 3 – 7+ years in front-end/UI engineering with meaningful ownership of production web applications
Desirable
- Experience building and maintaining design systems and component libraries (Storybook, token-based theming)
- Familiarity with Next.js (SSR/SSG), route-based code splitting, and server components concepts
- Experience with observability for front-end applications (client-side logging, real user monitoring, error tracking)
- Knowledge of secure front-end patterns (OWASP Top 10 awareness, CSP, XSS mitigation, dependency scanning)
- Exposure to fintech/payments domain or other regulated environments
- Experience collaborating on API contracts and using API schema/contract tooling (OpenAPI, GraphQL schemas)
What the job involves
- Build, enhance, and run production-grade services by taking solution blueprints from Product Engineering teams and owning end-to-end delivery—from design refinement and implementation through release, monitoring, and operational excellence
- Build responsive, accessible (WCAG-aware) user interfaces using React and modern TypeScript patterns
- Translate UX/UI designs (Figma/Sketch) into high-quality, reusable components aligned to a design system
- Design front-end architecture for scalability and maintainability (routing, state management, component composition, data-fetching patterns)
- Integrate with backend APIs (REST/GraphQL) and handle authentication/authorization patterns (e.g., OAuth/OIDC flows) in partnership with platform teams
- Implement robust testing practices: unit/component tests, integration tests, and end-to-end tests; contribute to quality gates in CI/CD
- Drive performance and reliability: bundle optimization, rendering performance, caching strategies, error handling, and monitoring of client-side issues
- Ensure secure front-end practices: dependency hygiene, safe handling of user input, and adherence to secure SDLC standards
- Collaborate closely with Product, Design, Backend, and QA; contribute to iterative delivery, code reviews, and technical design discussions. Ways of working:
- Comfortable collaborating with product and design partners; can clarify ambiguity and deliver iteratively
- Communicates clearly in PRs and technical notes; advocates for accessibility and performance as first-class concerns
- Balances speed with quality; pragmatic about trade-offs while maintaining engineering standards
- Proactive about production health and user experience, using data to drive improvements
- Typical Deliverables:
- UI technical design notes (component boundaries, state/data flow, API integration patterns)
- Reusable React components and/or design-system contributions (documentation and examples)
- Automated test suites (unit/component and end-to-end) integrated into CI/CD
- Performance and accessibility improvements with measurable outcomes
- Production readiness artifacts (feature flags, rollout notes, error monitoring dashboards/alerts where applicable)
- Success measures (example):
- Features delivered from design to production with low defect rates and minimal rework
- Improved user experience metrics (performance, accessibility compliance, usability feedback)
- Well-tested UI with reliable releases through CI/CD and repeatable deployment practices
- Reduced production issues via observability, fast triage, and effective root-cause fixes
Application process
- End Date: May 29, 2026
Our take
Mastercard is in the global payments business, and operates the world's fastest payments processing network. Its products and solutions have become central to everyday commerce across the world, in activities ranging from shopping and travelling to running businesses.
As the economy has become more and more digitised, Mastercard has been a leading player in helping businesses and individuals across the globe embrace card payments and digital banking. One of the world's largest companies, its revenue has seen consistent gain in the last 20 years.
The challenge for modern payments companies is that payments are always changing, as seen in the astronomical rise of contactless payments over the last decade. Mastercard's acquisition of blockchain systems, and an overall focus on leveraging its technology towards a digital economy, has placed the company in good stead to keep up to date with current trends, like cryptocurrency, in the digitised payments world.
Steph
Company Specialist at Welcome to the Jungle
Insights
21% employee growth in 12 months
Company
Company benefits
- Gym membership
- Share purchase options
- Extra holiday purchase optional
- Work from home opportunities
- Health insurance
Company HQ
Purchase, Harrison, NY
Leadership
Michael Miebach
(CEO)Has served in a variety of roles at the company, including President and CPO. Currently Board Member at IBM, Accion, the World Resources Institute, the US-India Strategic Partnership Forum, and the Metropolitan Opera. They are also a Trustee of USCIB.
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