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 Shopify, Toast, Stripe, etc., is a massive plus).

• Experience building software for global markets, including managing the complexities of global tax, currency conversion, and localization.

• Deep understanding of web security, PCI compliance, and secure payment processing workflows.

Interview & Selection Process:

• In-Person Technical Assessment: Because this role requires daily on-site collaboration at our office, the interview loop includes an in-person technical interview and live coding session at our local campus.

• Identity Verification: Candidates invited to interview must present a valid government-issued photo ID prior to entering our facility and commencing technical evaluations.

How you’ll work:

• This role is on-site Monday through Friday. Fiserv considers in-person collaboration to be an essential part of this role as in-person office experiences help you with your overall onboarding experience and leads to stronger productivity.

• This role requires use of a computer and audio equipment.

Benefits at Fiserv:

• Fuel Your Life program to support your physical, financial, social, and emotional well-being

• Paid holidays and generous time away policies

• No-cost mental health support through Employee Assistance Programs

• Living Proof program to recognize your peers’ extra effort with points redeemable for rewards

• Eight Employee Resource Groups to foster a collaborative culture and expand your network

• ·Unparalleled professional growth with training, development, and internal mobility opportunities

• Medical, dental, vision, life, and disability insurance options available from day one

• Retirement planning and discounted shares with the Employee Stock Purchase Plan

• Tuition assistance and reimbursement program

• Paid parental, caregiver, and military leave

#LI-SH2

Salary Range

$140,000.00 - $210,000.00

These pay ranges apply to employees in Sunnyvale, California. Pay ranges for employees in other states may differ.

It is unlawful to discriminate against a prospective employee due to the individual's status as a veteran.

For incentive eligible associates, the successful candidate is eligible for an annual incentive opportunity which may be delivered as a mix of cash bonus and equity awards in the Company’s sole discretion.

Thank you for considering employment with Fiserv. Please:

• Apply using your legal name

• Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable).

Our commitment to Equal Opportunity:

Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law.

If you have a disability and require a reasonable accommodation in completing a job application or otherwise participating in the overall hiring process, please contact View email address on click.appcast.io . Please note our AskHR representatives do not have visibility to your application status. Current associates who require a workplace accommodation should refer to Fiserv’s Disability Accommodation Policy for additional information.

Note to agencies:

Fiserv does not accept resume submissions from agencies outside of existing agreements. Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions.

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Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.