Sr. Front-End/Full Stack Developer at Fiserv in Sunnyvale, CA

Job description

Calling all innovators - find your future at Fiserv. We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv. Job Title Sr. Front-End/Full Stack Developer What does a successful Sr. Front-End/Fullstack Engineer do at Clover? In this role, you will be a lead UI/UX-minded engineer responsible for driving the client-side evolution and expansion of our platform. While you have the full-stack capability to navigate backend APIs, your primary strength and passion lie in building exceptional web experiences, modern user interfaces, and modular frontend architectures. As part of the Loyalty Program team, you will own the user experience on the Clover Dashboard , translating complex data into sleek, responsive web applications used by over 700k merchants worldwide. Working alongside a strong team of dedicated backend engineers, you will bridge the gap between design, product, and services—owning web client features end-to-end, evaluating modern frontend technologies, and ensuring sub-second UI responsiveness at scale. What you will do: Architect, design, and develop high-performance, modular web-based frontend applications using React, TypeScript, and modern JavaScript , backed by supporting Java/Spring Boot microservices. Own the client-side architecture of the Clover Dashboard, establishing frontend best practices, state management standards, and component libraries. Partner with Product, UX, and core Backend Engineers to translate product requirements into intuitive, reliable web workflows and clean, extensible software. Design, consume, and optimize RESTful APIs and GraphQL/event-driven endpoints built for web clients, mobile dashboards, and 3rd-party app integrations. Promote effective use of AI‑powered engineering tools (e.g., AI coding assistants, automated test generation, code review, and UI performance profiling) to accelerate delivery and quality. Own client services and features from design through deployment, automated UI testing, and production monitoring. Participate in design and code reviews, advocating for modular code, responsive design, accessibility, and clean frontend architecture. Coach and mentor team members to improve their technical frontend capabilities, web performance optimization, and UI testing strategies. Participate in regular release management and cross-functional agile rituals across distributed teams. What you will need to have: Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience. 7+ years of software development experience, with a proven focus on Frontend / Web Engineering . Expertise in React and TypeScript , including deep knowledge of modern client-side state management, build tooling (Webpack/Vite), and Web Performance Optimization. Strong Full Stack capabilities: Working knowledge of Java and Spring Boot to build, update, or integrate with existing backend microservices. Hands-on experience with modern CSS frameworks, component design systems, and responsive web design for complex dashboard interfaces. Experience using and championing AI-assisted development tools (e.g., GitHub Copilot, Cursor, automated test suites) to accelerate UI delivery. Practical knowledge of RESTful API design, HTTP/browser protocols, web security (OAuth2, CORS), and working with relational databases (MySQL, PostgreSQL). What would be great to have: Experience with Micro-frontend architectures (e.g., Webpack Module Federation). Familiarity with secondary languages/tools: Python, Node.js, GraphQL, or Docker/Kubernetes containerized workflows. Previous background in Fintech, e-commerce, P