React Developer

React Web Developer — American Express One AppLocation: Phoenix, AZ - Locals onlyOpenings: 6 positionsMandatory Experience: Front-end React development with hands-on American Express One App experienceInterview Mode: In-personJob SummaryWe are seeking React Web Developers with hands-on American Express One App experience to develop and maintain responsive, reusable front-end applications. The role involves building user interfaces, integrating APIs, improving application performance, and collaborating with product, design, back-end, and QA teams. Candidates must be comfortable delivering features within an existing One App application environment.Key ResponsibilitiesDevelop and maintain responsive web interfaces using React, JavaScript, HTML, and CSS.Build reusable components and implement features within the American Express One App environment.Develop and maintain modular front-end features using One App’s Holocron module architecture.Integrate REST APIs and handle application state, loading states, validation, and errors.Collaborate with designers and product teams to translate requirements into accessible, consistent user experiences.Optimise rendering, page-load performance, and front-end resource usage.Write and maintain unit and integration tests and support regression testing.Investigate browser, application, and integration issues and implement fixes.Participate in code reviews and follow established coding, security, and quality standards.Work with back-end engineers, QA, and DevOps teams to support integration and deployment.Document components, implementation decisions, and development workflows.Required QualificationsHands-on experience developing front-end applications with React.Prior hands-on experience with American Express One App is required.Strong JavaScript, HTML, CSS, responsive design, and browser-debugging skills.Understanding of One App’s modular architecture and independently developed, tested, and deployed Holocron modules.Experience integrating REST APIs and working with JSON.Experience with React component patterns, state management, and front-end testing.Familiarity with Git, code reviews, and CI/CD workflows.Ability to troubleshoot front-end issues and collaborate effectively across engineering and product teams.