Senior Frontend Engineer

American Express•Phoenix, AZ

12h•$123,000 - $215,250

About The Position

The Cyber Engineering team at American Express is seeking a frontend engineer within the Information Security organization. The role focuses on developing advanced UI/UX capabilities, including emerging technologies such as Generative AI, to address the evolving cyber threat landscape and protect American Express's digital assets. The engineer designs and builds scalable, secure, accessible, high-performance interfaces for traditional and AI-powered applications, and owns modern UI experiences from architecture and implementation through testing, deployment, and improvement. The role includes building AI-driven and agentic experiences, developing reusable components and design systems, prototyping new interaction patterns, and partnering with product, design, AI/ML, backend, and platform teams. It also calls for strong product and UX judgment, engineering excellence, performance and reliability measurement, and technical leadership in frontend practices. American Express describes a culture centered on innovation, shared values, leadership behaviors, and support for customers, communities, and colleagues. The company offers learning and career-development opportunities and benefits intended to support employees' physical, financial, and mental well-being. Work arrangements may be onsite, hybrid, or fully virtual depending on the role and business needs.

Requirements

Associate's or bachelor's degree in Computer Science, Information Systems, or a related field, or equivalent experience of 5+ years.
8+ years of experience with a strong focus on frontend or full-stack technology.
Proficiency in HTML, CSS, JavaScript, TypeScript, React, and Next.js, with experience building accessible, responsive, high-performance web applications.
Experience with modern frontend styling approaches such as Tailwind CSS, Sass, Less, CSS Modules, or similar.
Experience designing reusable UI components, design systems, and composable frontend platforms that scale across products and teams.
Expertise in modern frontend architecture, including state management, asynchronous and reactive UI patterns, performance optimization, rendering strategies, and micro-frontend or modular/composable UI architectures.
Hands-on experience building GenAI and/or agentic applications, particularly user-facing experiences powered by LLMs, AI agents, or multi-step AI workflows.
Experience designing AI interaction patterns, including conversational interfaces, copilot-style assistance, command- or intent-driven interactions, and dynamically generated or adaptive experiences.
Understanding of prompt engineering, context management, conversation/session state, tool invocation, and streaming response UX, including graceful handling of latency, partial responses, errors, and interruptions.
Experience building real-time and streaming experiences, including incremental rendering, asynchronous state updates, optimistic UI, and event-driven interactions.
Understanding of human-in-the-loop patterns, feedback mechanisms, user control, AI transparency, and explainability principles.
Experience defining and instrumenting AI/agentic UX metrics, including response time, latency, task completion, response quality, engagement, error/recovery rates, and user trust signals.
Ability to design experiences that communicate agent state and activity, including planning, progress, tool execution, confirmations, errors, and completion.
Experience implementing guardrails and user controls for AI-powered experiences, including confirmations, permission boundaries, failure recovery, and graceful degradation.
Experience with automated unit, integration, component, and end-to-end testing using tools such as Jest, Vitest, Cypress, Playwright, or similar.
Experience with frontend build systems, package management, and developer tooling such as Vite, Webpack, npm, pnpm, yarn, or equivalent.
Familiarity with product and UI design tools such as Figma and ability to translate design systems and prototypes into production-quality experiences.
Proficiency with AI-assisted development tools such as GitHub Copilot, Claude Code, Cursor, or Gemini Code Assist, and ability to review AI-generated code for correctness, security, performance, accessibility, and maintainability.
Hands-on experience with Git, CI/CD pipelines, secrets management, and modern delivery practices using Jenkins, GitHub Actions, or equivalent.
Demonstrated ability to work effectively in an Agile, cross-functional environment, navigate ambiguity, and adapt to evolving technologies, requirements, and priorities.
Excellent communication, collaboration, and technical leadership skills, including the ability to influence architecture and engineering practices and partner with product, design, AI/ML, platform, and engineering teams.

Nice To Haves

Familiarity with containerization and cloud-native technologies, including Docker and Kubernetes.
Experience with browser extension development and/or mobile application development.
A portfolio, GitHub profile, or examples of previous work demonstrating sophisticated user-facing application design and development.

Responsibilities

Design and build scalable, secure, accessible, and high-performance user interfaces across traditional and AI-powered applications.
Own end-to-end development of modern UI experiences, from architecture and implementation through testing, deployment, and continuous improvement.
Build AI-driven and agentic experiences, including conversational, copilot-style, intent-driven, streaming, and human-in-the-loop interactions.
Partner with product, design, AI/ML, backend, and platform teams to translate business and user needs into cohesive digital experiences.
Develop and evolve reusable UI components, design systems, and modular frontend architectures.
Prototype, experiment with, and iterate on new capabilities and interaction patterns, moving successful concepts into production.
Continuously learn and adapt to evolving technologies, frameworks, AI capabilities, and UI paradigms.
Promote engineering excellence through maintainable, well-tested code, code reviews, performance optimization, accessibility, security, and refactoring.
Apply product and UX judgment using user research, prototypes, experimentation, analytics, and feedback to improve user experiences.
Drive performance, reliability, and quality through testing, observability, telemetry, and measurement of traditional and AI-powered experiences.
Evaluate emerging technologies, influence frontend engineering standards and best practices, and drive technical direction.
Demonstrate ownership and autonomy by navigating ambiguity, prioritizing, communicating trade-offs, and driving initiatives from concept through production.

Benefits

Competitive base salaries
Bonus incentives
6% company match on retirement savings plan
Free financial coaching and financial well-being support
Comprehensive medical, dental, vision, life insurance, and disability benefits
Flexible working model with hybrid, onsite, or virtual arrangements depending on role and business need
20+ weeks of paid parental leave for all parents, including for pregnancy, adoption, or surrogacy
Free access to global onsite wellness centers staffed with nurses and doctors, depending on location
Free and confidential counseling support through the Healthy Minds program
Career development and training opportunities