Sr Full Stack Engineer

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 Full Stack Engineer About your role: To accelerate our leadership in the point-of-sale (POS), retail tech, and financial technology sectors, Clover is aggressively expanding our digital omni-commerce capabilities. As a Full Stack Software Development Engineering - Advisor I, you will serve as a critical technical driver in building our next-generation website, storefront, and seamless checkout experiences. This vital role directly supports our 2026 strategic objectives to accelerate international expansions across APAC, Japan, and the EU, eliminate backend dependencies to maximize feature velocity, and pioneer AI-driven agentic commerce integrations. What you’ll do: Full Stack Product Delivery: Architect, build, and deploy high-performance e-commerce storefronts, secure checkout flows, and omni-channel retail merchant integrations (linking digital storefronts with brick-and-mortar retail systems). Frontend Excellence: Develop responsive, SEO-friendly, and accessible user interfaces using React.js and Next.js, optimizing for Core Web Vitals and seamless user experiences. Backend & API Architecture: Design and implement highly available, secure microservices using Java, Spring Boot, and Hibernate to reduce cross-team dependencies and maximize feature delivery velocity for retail business logic. Database & Infrastructure: Model complex commerce data (such as real-time retail inventory management, product catalogs, and order management systems) using MongoDB and MySQL, while deploying and scaling localized microservices using Kubernetes and Docker on Google Cloud Platform (GCP). Internationalization (i18n): Build resilient systems capable of supporting multi-region scalability, localization, and regional compliance for seamless multi-region traffic handling. AI Integration & Adoption: Actively utilize AI-assisted developer tools (e.g., GitHub Copilot, Cursor, ChatGPT) to accelerate coding velocity, and design backend architectures capable of supporting smart product recommendations and agentic commerce integrations. Mentorship & Quality: Lead code reviews, define architectural standards, and mentor mid-level/junior engineers to foster a culture of engineering excellence. Responsibilities listed are not intended to be all-inclusive and may be modified as necessary. Experience you’ll need to have: Core Experience: 5-8+ years of professional software engineering experience building scalable, enterprise-grade web applications. Domain Expertise: Proven professional experience working within the Retail domain, with a strong technical grasp of retail workflows, inventory synchronization, order management, or point-of-sale dynamics. Frontend: Deep expertise in JavaScript/TypeScript, React.js, and Next.js (SSR, SSG, and CSR strategies). Backend: Strong proficiency in Java and the Spring ecosystem (Spring Boot, Spring Security) alongside ORM experience with Hibernate. Databases: Hands-on experience with both relational (MySQL) and NoSQL (MongoDB) databases. Cloud & DevOps: Experience designing and deploying microservices on GCP (or AWS) using Kubernetes, Docker, and CI/CD pipelines. AI Proficiency: Demonstrated ability to integrate AI into daily development workflows to increase productivity, with a strong foundational understanding of LLMs and AI integrations. Experience that would be great to have: Previous experience in Fintech, POS, or E-commerce platforms (direct familiarity with competing platforms like