Front End Engineer

Front End Engineer | Sunnyvale, CA | Fiserv |

Secondary locations: Dallas, TX / Berkeley Heights, NJ / Chicago, IL / Alpharetta, GA

Role Overview:

We are hiring Front-End Engineers to build fast, accessible, and consistent user experiences.

You will work closely with designers and back-end teams to deliver polished interfaces backed by

a shared design system.

Key Responsibilities

• Build and maintain responsive web interfaces using HTML, CSS, and React (Angular

experience is also valued).

• Integrate front-end applications with back-end services and REST APIs, handling CORS

and authentication flows correctly.

• Implement real-time features using Web Sockets.
• Optimize performance and meet Core Web Vitals targets (LCP, INP, CLS).
• Contribute to and consume the company design system, building reusable, welldocumented components.
• Use Node.js tooling for builds, bundling, and lightweight services.
• Ensure accessibility, cross-browser compatibility, and responsive behavior.
• Participate in code reviews and collaborate with QA on testability.

Required Qualifications

• 5+ years of front-end development experience.
• Strong HTML5, CSS3, and JavaScript/TypeScript skills.
• Production experience with React; working knowledge of Angular.
• Experience with API integration, CORS, and Web Sockets.
• Practical knowledge of web performance and Core Web Vitals.
• Experience working within a design system or component library.

Preferred Qualifications

• Experience with Node.js and modern build tooling.
• Knowledge of accessibility standards (WCAG).
• Experience with front-end testing frameworks