Lead Software Engineer - Frontend / Fullstack

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
Lead Software Engineer - Frontend / Fullstack
Lead Software Engineer, Front-End & Full Stack AI Applications - Foundry R&D, Singapore
We are looking for a Lead Software Engineer to join the Mastercard Foundry R&D team. You will work on innovative, scalable products, experiment with new technologies, and help shape our AI-driven user experiences. The ideal candidate is hands-on, curious, motivated, and comfortable working in fast-moving R&D environments.
What you'll do
* Lead front-end development for AI products: Design and build modern, interactive web interfaces for AI-driven applications. Create dashboards and visualisations that make AI insights intuitive and accessible. Iterate quickly to prototype new capabilities and demonstrate product potential.
* Full-stack architecture and integration: Own the end-to-end architecture from front-end to backend interaction. Build modular components and ensure smooth integration with services and APIs. Use scalable patterns including micro-frontends where helpful.
* Design intuitive UX and visualisations: Apply strong UI/UX thinking to simplify complex AI outputs. Build visual elements such as charts, trends, or agent reasoning views that improve clarity and usability.
* Ensure quality, performance, and security: Implement testing across unit, integration, and end-to-end layers. Maintain code quality through reviews and enforce security and performance best practices.
* Mentor and collaborate: Guide junior engineers, review code, and encourage use of strong design patterns. Work closely with designers, product managers, and AI researchers to deliver well-rounded solutions.
What you'll bring
* Strong front-end expertise: 8-12+ years of software development with deep experience in modern front-end stacks. Proficiency in JavaScript/TypeScript, React (preferred), or Angular/Vue. Skilled in state management, routing, build tooling, and UI architecture.
* Broad full-stack experience: Competent in backend development, especially REST APIs and database design using SQL or NoSQL technologies.
* User-centric mindset: Ability to translate complex concepts into clear, usable interfaces. Experience working with design tools and prototypes.
* Architectural leadership: Background designing modular, scalable front-end systems. Experience promoting clean structure, reusable components, and documentation.
* Strong communication and collaboration: Able to work with distributed teams and communicate clearly with technical and non-technical stakeholders.
* Continuous learning: Comfortable working with ambiguity and exploring new technologies. Motivated to build prototypes and evolve solutions quickly.
Required skills
* Education and experience: Bachelor's degree in Computer Science or related field. 8-12+ years in software engineering with significant front-end experience.
* Front-end development: Expert in JavaScript and TypeScript. Extensive experience with React or similar frameworks. Skilled in translating UI/UX designs into high-quality web interfaces.
* UI/UX and visualisation: Experience building interactive UIs and data visualisations. Ability to work from design tools such as Figma or Adobe XD and ensure attention to detail.
* Backend and API integration: Strong ability to integrate with RESTful APIs, manage asynchronous calls, handle data formats, caching, errors, and retries.
* Software quality and DevOps: Experience writing automated tests using Jest, Mocha, or similar tools. Familiarity with CI/CD pipelines and code quality practices.
* Security and performance: Understanding of common web vulnerabilities (XSS, CSRF, clickjacking) and performance best practices. Able to apply mitigations through proper coding and configuration.
Preferred skills
* Real-time and advanced web features: Experience building features using WebSockets, SSE, or other real-time techniques for live dashboards or event streams.
* Data visualisation libraries: Experience with D3.js, Plotly, Recharts, or Three.js for advanced visualisations.
* Advanced testing and tooling: Experience using E2E frameworks such as Cypress or Playwright.
* AI and FinTech familiarity: Helpful to have experience integrating LLMs, chatbots, or AI-driven analytics. Understanding latency, uncertainty, and other AI UX considerations is beneficial.
* UI/UX leadership and innovation: Contributions to innovative projects, open-source work, hackathons, or technical blogging.
* Cloud deployment: Familiarity with deploying web applications on cloud platforms and optimising for scalability.
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.