Senior Frontend Software Engineer - Global Commercial Services Technology

Global Commercial Services (GCS) serves millions of business customers around the world, from mom-and-pop shops to Fortune 500 companies. We back businesses so they can do more business, with a mission to be the undisputed leader in financial and membership services - responsibly driving double-digit revenue growth. We do that by offering a diverse range of payment and cashflow tools, from a wide range of traditional card products, to working capital and supply chain financing, to new digital solutions that make it easy for our customers to manage a full range of their financial and payment needs.

The Global Commercial Services team at American Express is seeking a Senior Software Engineer I with strong expertise in frontend development and user-centric product engineering. This role will play a key part in building a next-generation expense management platform that delivers intuitive, scalable, and high-performing digital experiences for Small and Medium-sized (SMS) businesses and Corporate customers.

• Lead the design, development, and deployment of modern web applications using React and TypeScript.
• Collaborate closely with product managers, designers, and stakeholders to shape product requirements and user experiences.
• Build scalable, responsive, and accessible frontend architectures and component libraries.
• Develop data-driven UI experiences, dashboards, and dynamic forms using JSON-schema or similar approaches.
• Partner with backend engineers to integrate APIs and deliver seamless end-to-end functionality.
• Mentor engineers and contribute to a strong culture of collaboration across teams and engineering guilds.
• Integrate analytics, instrumentation, and observability into frontend applications.
• Optimize performance, scalability, and reliability across browsers and devices.
• Participate in architecture discussions, RFCs, and proof-of-concept initiatives.
• Establish and maintain coding standards, testing practices, and design conventions.
• Plan, estimate, and execute on deliverables while proactively identifying risks and resolving blockers.
• Communicate progress and demonstrate milestones to stakeholders, incorporating feedback into iterative improvements.

Qualifications

• 5+ years of experience in software engineering with a strong focus on frontend development.
• Experience collaborating closely with product management and UX design teams.
• Strong design sensibilities and a desire to build pixel perfect UI.
• Strong communication, leadership, and mentoring skills.
• Expert proficiency in React and Typescript.
• Strong hands-on experience building modern web applications:

Web

Next.js (App Router, RSC), React 19.

Mobile

React Native (Expo), React 19.

Monorepo

Turborepo

Data & state

TanStack Query (React Query) for server state, Zustand for client state, and tRPC for type-safe client-server contracts.

UI & design system

Tailwind CSS, class-variance-authority, and an internal component library; Framer Motion and react-reanimated for animation.

Observability & analytics

Datadog RUM and APM, Amplitude, FullStory.

Testing

Vitest for unit and integration tests; familiarity with component, visual, and end-to-end testing approaches.

CI/CD

Github Actions

Employment eligibility to work with American Express in the United States is required as the company will not pursue visa sponsorship for this position.