Sr. Web Application Developer

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. Web Application Developer

What does a successful Senior Web Application Developer do at Fiserv?

Join our Digital Journeys team as a React Web Application Developer, where you'll play a pivotal role in creating personalized, scalable web experiences used across our Retail, Services, and Restaurant verticals. This critical position drives the development of reusable components and dynamic web personalization, enabling seamless customer journeys and future-ready digital solutions. If you're passionate about building high-performance user interfaces and collaborating closely with design and engineering teams, this is your opportunity to make a real impact.

What you will do:

• Develop and maintain reusable, modular, and scalable UI components using React and Next.js, supporting web personalization, and enabling website creation across multiple business verticals, including Retail, Services, and Restaurants. Your work will directly impact the scalability, performance, and future-readiness of our digital customer experiences.
• Collaborate with product managers, designers, and backend engineers to deliver end-to-end solutions that are aligned with business objectives.
• Implement server-side rendering (SSR), static site generation (SSG), and dynamic routing using Next.js for optimized performance and SEO.
• Ensure high-quality output through code reviews, unit testing, and adherence to secure coding practices.
• Monitor and optimize application performance using tools such as Web Vitals, Lighthouse, or equivalent observability platforms.
• Contribute to our shared component libraries and internal development standards.
• Participate in Agile development processes, including sprint planning, retrospectives, and daily stand-ups.

What you will need to have:

• Bachelor's Degree (preferably Computer Science or Engineering) or equivalent combination of experience, education and military.
• 2-5 years of experience in frontend software development.
• Experience with JavaScript (ES6+), React.js, and Next.js.
• Experience with TypeScript, HTML5, and CSS3 (including modern styling libraries such as Tailwind CSS or CSS Modules).
• Strong understanding of RESTful API integration and asynchronous data management.
• Working knowledge of source control systems such as Git and experience with CI/CD workflows.
• Familiarity with accessibility (WCAG), responsive design principles, and cross-browser compatibility.

What would be great to have:

• Experience with modern state management libraries (e.g., React Query, Zustand, Redux Toolkit).
• Exposure to observability and error-tracking tools (e.g., Datadog, Sentry).
• Knowledge of unit and integration testing frameworks (e.g., Jest, React Testing Library, Cypress).
• Prior experience in a high-scale production environment serving enterprise customers.
• Understanding of SEO optimization, performance tuning, and Core Web Vitals.

Important info about this role:

• We're better together. This role is fully on-site.
• In order to be considered, you must be legally authorized to work in the U.S. without need for sponsorship now or in the future.

This role is not eligible to be performed in Colorado, California, District of Columbia, Hawaii, Illinois, Maryland, Minnesota, New Jersey, New York, Nevada, Rhode Island or Washington.

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

Please note that salary ranges provided for this role on external job boards are salary estimates made by outside parties and may not be accurate.

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 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.