{"id":46366,"url":"https://alion.io/job/mastercard-lead-software-engineer-frontend-ui","title":"Senior Software Engineer","company":{"id":252,"name":"Mastercard","domain":"mastercard.com","url":"https://alion.io/company/mastercard","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":94,"open_postings":254,"ghost_share":0.016,"stale_share":0.358,"repost_share":0.094,"time_to_fill_p50_days":21,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Dublin, Ireland"],"countries":["IE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":84000,"max_usd":177000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":35},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"CI/CD","optional":false},{"name":"CSS Modules","optional":false},{"name":"Cypress","optional":false},{"name":"Figma","optional":false},{"name":"GraphQL","optional":false},{"name":"Jest","optional":false},{"name":"Playwright","optional":false},{"name":"React Query","optional":false},{"name":"React.js","optional":false},{"name":"Redux Toolkit","optional":false},{"name":"Rest API","optional":false},{"name":"Sketch","optional":false},{"name":"State Management","optional":false},{"name":"SWR","optional":false},{"name":"Tailwind CSS","optional":false},{"name":"TypeScript","optional":false},{"name":"Vite","optional":false},{"name":"Vitest","optional":false},{"name":"Webpack","optional":false},{"name":"Zustand","optional":false},{"name":"JavaScript","optional":true},{"name":"Next.js","optional":true},{"name":"OWASP Top 10","optional":true},{"name":"Redux","optional":true},{"name":"Storybook","optional":true}],"status":"live","first_seen_at":"2026-08-07T00:00:00Z","employer_posted_date":"2026-09-29","last_verified_at":"2026-10-17T03:51:18Z","board_verified":true,"closed_at":null,"days_open":71,"trust":{"level":"ok","repost_count":1,"flags":[],"days_open":71},"description":"Our Purpose\nMastercard 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.\nTitle and Summary\nSenior Software EngineerJob Description SummaryOverview\nWho We Are - Mastercard\nMastercard is a global technology company in the payments industry, operating in over 210+ countries and territories. Our mission is to power an inclusive, sustainable, digital economy that benefits everyone, everywhere - by making transactions safe, simple, smart, and accessible.\nWe harness secure data, world-class networks, deep partnerships, and relentless innovation to help individuals, financial institutions, businesses, and governments reach their greatest potential.\nOur culture is guided by our Decency Quotient (DQ) - a core value that influences every decision we make and how we treat all who rely on us.\nAbout AI & Decision Product Enablement (AI&DPE)\nAI & Decision Product Enablement (AI&DPE) is Mastercard’s innovation engine for AI-driven decisioning at global scale.\nWe build and enhance the platforms that power real-time intelligence across Mastercard’s network - enabling:\nMillisecond-latency decisioning\nResilient, highly available global services\nHundreds of AI models\nHundreds of thousands of business rules\n0 50+ market-facing products across Mastercard Services\nProducts that protect revenue, mitigate fraud, and empower customers worldwide\nAI&DPE teams ensure Mastercard delivers industry-leading agility, intelligence, resiliency, and scalability in every product we build.\nRole:\nBuild, 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.\nWhat you’ll do (Key responsibilities):\nBuild responsive, accessible (WCAG-aware) user interfaces using React and modern TypeScript patterns.\nTranslate UX/UI designs (Figma/Sketch) into high-quality, reusable components aligned to a design system.\nDesign front-end architecture for scalability and maintainability (routing, state management, component composition, data-fetching patterns).\nIntegrate with backend APIs (REST/GraphQL) and handle authentication/authorization patterns (e.g., OAuth/OIDC flows) in partnership with platform teams.\nImplement robust testing practices: unit/component tests, integration tests, and end-to-end tests; contribute to quality gates in CI/CD.\nDrive performance and reliability: bundle optimization, rendering performance, caching strategies, error handling, and monitoring of client-side issues.\nEnsure secure front-end practices: dependency hygiene, safe handling of user input, and adherence to secure SDLC standards.\nCollaborate closely with Product, Design, Backend, and QA; contribute to iterative delivery, code reviews, and technical design discussions.\nWays of working:\nComfortable collaborating with product and design partners; can clarify ambiguity and deliver iteratively.\nCommunicates clearly in PRs and technical notes; advocates for accessibility and performance as first-class concerns.\nBalances speed with quality; pragmatic about trade-offs while maintaining engineering standards.\nProactive about production health and user experience, using data to drive improvements.\nTypical Deliverables:\nUI technical design notes (component boundaries, state/data flow, API integration patterns)\nReusable React components and/or design-system contributions (documentation and examples)\nAutomated test suites (unit/component and end-to-end) integrated into CI/CD\nPerformance and accessibility improvements with measurable outcomes\nProduction readiness artifacts (feature flags, rollout notes, error monitoring dashboards/alerts where applicable)\nAll About You\nMust be detail-oriented, proactive, and able to function under pressure in a delivery-focused environment.\nDemonstrates high ownership and strong follow-through; comfortable taking work from concept to production.\nPossesses strong communication skills-both verbal and written-and strong collaborative/relationship-building skills.\nComfortable working in a matrixed, diverse, and geographically distributed team.\nDeep understanding of modern software delivery practices including Agile and test-driven development.\nCore technical requirements (must-have):\nStrong proficiency in React with TypeScript (functional components, hooks, composition patterns).\nSolid understanding of HTML5, CSS3, responsive design, and modern styling approaches (CSS Modules, CSS-in-JS, Tailwind or equivalent).\nExperience with state management and data-fetching patterns (Context, Redux Toolkit, Zustand, React Query/SWR or equivalent).\nStrong testing discipline: Jest/Vitest, React Testing Library, and end-to-end testing (Cypress/Playwright).\nProduction experience with build tooling and performance optimization (Vite/Webpack, code-splitting, bundle analysis, lazy loading).\nExperience integrating with APIs (REST and/or GraphQL), handling async flows, and implementing robust client-side error handling.\nCI/CD familiarity for front-end apps (pipelines, quality gates, automated tests, artifact builds, environment promotion).\nAccessibility fundamentals (semantic HTML, keyboard navigation, ARIA usage) and commitment to inclusive UX.\nNice to have:\nExperience building and maintaining design systems and component libraries (Storybook, token-based theming).\nFamiliarity with Next.js (SSR/SSG), route-based code splitting, and server components concepts.\nExperience with observability for front-end applications (client-side logging, real user monitoring, error tracking).\nKnowledge of secure front-end patterns (OWASP Top 10 awareness, CSP, XSS mitigation, dependency scanning).\nExposure to fintech/payments domain or other regulated environments.\nExperience collaborating on API contracts and using API schema/contract tooling (OpenAPI, GraphQL schemas).\nSuccess measures (example):\nFeatures delivered from design to production with low defect rates and minimal rework.\nImproved user experience metrics (performance, accessibility compliance, usability feedback).\nWell-tested UI with reliable releases through CI/CD and repeatable deployment practices.\nReduced production issues via observability, fast triage, and effective root-cause fixes.\nExperience level (guidance):\nTypically 3 - 7+ years in front-end/UI engineering with meaningful ownership of production web applications.\nCorporate Security Responsibility\nAll 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:\nAbide by Mastercard’s security policies and practices;\n\nEnsure the confidentiality and integrity of the information being accessed;\n\nReport any suspected information security violation or breach, and\n\nComplete all periodic mandatory security trainings in accordance with Mastercard’s 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