Sr. Full Stack Developer

Location: Sunnyvale, California, United States of America

Job ID: R-10397883

Category: Technology

Onsite

Posting Start Date: Posting Start Date: 29-July-2026

Posting End Date: Posting End Date: 13-August-2026

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 Developer

About your role:

Fiserv is a global leader in financial technology, and our Clover platform provides smart Point-of-Sale (POS) and business management networks that move money securely for millions of businesses daily. As a Senior Fullstack Engineer on the Loyalty Program team, you will help improve and our platform by building applications, creating new features, and re-architecting systems for better scalability and availability across the Clover Dashboard. Partnering with Infrastructure, Product, and Design teams, you will own your services from development through deployment, mentor junior talent, and help drive the technical roadmap for products that support over 700,000 merchants worldwide.

What you’ll do:

Architect, design, and develop web-based front-end applications and backend microservices primarily using Java, JavaScript, TypeScript, React, and Python.

Design, implement, and maintain performant REST APIs for web clients, devices, mobile apps, and 3rd-party integrations.

Own services and features end-to-end from initial development through deployment, production monitoring, and on-call release management rotations.

Promote the effective use of AI-powered software engineering and productivity tools (AI coding assistants, test generation, code reviews, documentation, and incident analysis) to improve developer efficiency and code quality.

Translate product requirements into functional, extensible software while partnering with cross-functional, distributed Agile teams to assist with project planning and feature development.

Partner with the Infrastructure and QA teams to design data models supporting large-scale, highly available services and develop comprehensive test plans.

Coach and mentor junior engineers, advocate engineering best practices with a CI/CD DevOps mindset, and help define the technical software roadmap.

Triage bugs, resolve operational issues, participate in design/code reviews, and evaluate modern frameworks to improve product performance.

Responsibilities listed are not intended to be all-inclusive and may be modified as necessary.

Experience you’ll need to have:

Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience.

7+ years of professional software development experience, with a focus on Fullstack engineering.

Strong backend coding skills with deep expertise in Java as a primary language, alongside experience using Spring Boot to build microservices.

Professional front-end engineering experience using React and TypeScript.

Proven experience using and championing AI-based software engineering and productivity tools (e.g., AI coding assistants, automated testing, code quality analysis, operational intelligence tools) to accelerate delivery.

Strong working knowledge of relational databases (e.g., MySQL) and document databases (e.g., MongoDB).

Experience that would be great to have:

Previous experience in the payments or fintech industry.

Hands-on background in re-architecting legacy systems for high availability, performance, and scale.

Familiarity with Google Cloud Pub/Sub, Kubernetes (K8s), AWS Lambda, LLM prompting techniques, Kotlin, or Python.

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 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:

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.

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.

Warning about fake job posts:

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.