Sr Full Stack Engineer

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
• 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
• 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
• internal mobility opportunities Medical, dental, vision, life
• 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
• 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
• 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 AskHR.US@fiserv.com .
• 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.
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• Fiserv is not responsible for any fees associated with unsolicited resume submissions.
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