Fiserv

Sr Full Stack Engineer

Fiserv$140K — $210K *
Information Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 5-8+ years of professional software engineering experience in enterprise-grade web applications.
  • Deep expertise in JavaScript/TypeScript, React.js, and Next.js.
  • Strong proficiency in Java and Spring Boot, including security aspects.
  • Hands-on experience with MySQL (relational) and MongoDB (NoSQL).
  • Experience deploying microservices on GCP or AWS, utilizing Kubernetes and Docker.
  • Ability to integrate AI into development workflows, familiar with LLMs.

Responsibilities

  • Architect and deploy high-performance e-commerce storefronts and checkout flows.
  • Develop responsive, SEO-friendly user interfaces with React.js and Next.js.
  • Design secure microservices using Java, Spring Boot, and Hibernate.
  • Manage complex commerce data using MongoDB and MySQL in a scalable manner.
  • Support internationalization for multi-region system compliance and traffic handling.
  • Implement AI-driven smart product recommendations and integration features.
  • Lead code reviews and mentor mid-level/junior engineers for team excellence.

Benefits

  • Fuel Your Life program for physical, financial, social, and emotional well-being.
  • Generous paid holidays and time off policies.
  • No-cost mental health support through Employee Assistance Programs.
  • Living Proof program to recognize employee contributions with redeemable rewards.
  • Access to Employee Resource Groups to enhance collaboration and networking.
  • Comprehensive professional growth opportunities through training and development.
  • Medical, dental, vision, life, and disability insurance available from day one.
  • Retirement planning and discounted shares through Employee Stock Purchase Plan.
  • Tuition assistance and reimbursement options.
  • Paid parental, caregiver, and military leave.
Full Job Description
Job Title
Sr Full Stack Engineer

About your role:

To accelerate our leadership in the point-of-sale (POS) 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 merchant integrations.
  • 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 time-to-market.
  • Database & Infrastructure: Model complex commerce data 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.
  • 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.


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).

About Fiserv

CashEdge(R) provides infrastructure that global financial institutions rely on to extend their online channels and enhance customer profitability. CashEdge delivers secure Online Money Movement and Advanced Account Aggregation platforms that power specialized retail banking and advisor applications. These proven solutions enable CashEdge's clients to create compelling online offerings that attract customers, generate revenues, and reduce costs. CashEdge serves top-tier financial institutions around the world. Clients and partners include Vanguard, RBC Financial Group, CIBC, Yahoo! Finance, Digital Insight, First Data, TD Canada Trust, NYCE, Laurentian Bank, Financial Fusion and Corillian. CashEdge has offices in New York and Silicon Valley.

Fiserv Careers

Join the Fiserv team today and be part of a dynamic company known for innovation, leadership, and a commitment to the professional growth of its employees. At Fiserv, we offer more than just job opportunities; we provide a platform where skills are honed, leadership is cultivated, and career aspirations are achieved. Work You’ll Do At Fiserv, we are constantly on the lookout for talented individuals eager to thrive in a culture that fosters growth and diversity. Our team is composed of professionals who lead the way in financial services technology. By joining us, you will collaborate with some of the brightest minds in the industry, working together to solve complex challenges and deliver innovative solutions that impact millions of people every day. Explore Our Job Opportunities Whether you're seeking an entry-level position or a more senior role, Fiserv offers a range of career paths in areas such as software development, project management, financial analysis, and client services. Our hiring process is designed to identify and attract individuals who are not only technically proficient but who also embody our values of integrity and responsibility. Internship Programs Kickstart your career with a Fiserv internship. Our internships provide invaluable workplace experience and networking opportunities that often lead to full-time employment. As an intern, you’ll gain hands-on experience while working on meaningful projects that directly contribute to the company’s goals. Benefits and Culture Fiserv is committed to the well-being and continuous development of our employees. We offer competitive benefits including health, dental, and vision insurance, as well as opportunities for professional development through leadership training and diversity programs. Our culture is one of inclusion, where every team member is valued and has the opportunity to contribute to our success. Career Growth and Development We believe in nurturing the potential of our employees through career development initiatives and continuous learning opportunities. At Fiserv, you will find a supportive environment where you can grow your career through on-the-job experiences, mentoring, and formal training. Stay Connected Join Our Team Search open positions that match your skills and interests. We look for passionate, curious, creative, and solution-driven team players. Start your journey with Fiserv today and help shape the future of financial services. Keep Up to Date Stay ahead with career tips, insider perspectives, and industry-leading insights you can put to use today—all from the people who work here. Job Alert Emails Personalize your subscription to receive job alerts, latest news, and insider tips tailored to your preferences. Discover the exciting and rewarding career opportunities that await at Fiserv. Explore, innovate, and grow with Fiserv. Let your career journey begin here, where you can make a real difference in the world of finance.
Learn more about Fiserv
Size
44,000 employees
Market Cap
$63.4 billion
Industry
Net Income
$958 million
Founded
1984
5 Year Trend
+24.1%
Revenue
$14.8 billion
NASDAQ

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