Senior Full Stack 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

What does a successful Senior Full Stack Developer do at Fiserv?

As a Full Stack Developer, you will be a part of a small but growing team of hardworking people responsible for creating and maintaining a suite of cutting-edge back-of-house web applications, point-of-sale APIs, and Android client applications in a fast-paced, results-oriented environment. Our Full Stack Developers utilize their Java Server Engineering and Web Development experience in understanding the constraints and needs of the business to elevate the quality of the output of the entire team over time. They lead by example, prioritize quality, and help define the long-term architecture for the full suite of applications. We are seeking flexible engineers who are not afraid to be involved in product discussions and work with multiple parts of the stack.

What you will do:

• You’ll take ownership of one or more web services—adding new features, fixing bugs, and making improvements to keep the code clean and efficient. 
• You’ll design and build REST APIs that power our mobile apps, web dashboard, payment devices, and partner tools. 
• You’ll work closely with the product team to turn big ideas into practical, well-planned features that align with our goals. 
• You’ll lead your features from start to finish—building, launching, and keeping an eye on them once they’re live. 
• You’ll team up with infrastructure engineers to create data models that support fast, reliable services at scale.  
• You’ll write automated tests for your features and help QA build strong test strategies to keep everything working smoothly. 
• You’ll be part of a collaborative, agile team—sharing ideas, giving feedback, and joining planning sessions to keep projects on track.  
• You’ll join a regular on-call rotation, helping us quickly respond to any issues and keep our systems running smoothly.

What you will need to have:

• Bachelor's Degree (preferably Computer Science or Engineering) or equivalent combination of experience, education and military. 
• 5+ years of hands-on experience with Java development.
• Proven experience in backend server-side development.
• Proficiency in JavaScript-based web development, particularly with TypeScript and React.
• Strong understanding of modern web UI technologies including HTML5 and CSS3.
• Experience working with MySQL or comparable relational databases.
• Skilled in API design and implementation.
• Familiarity with software development lifecycles, including practical experience with Scrum.

What would be great to have:

• Background in frontend JavaScript development, with exposure to web services, e-commerce platforms, or high-volume transactional systems. 
• Experience developing microservices, preferably using Spring Boot. 
• Familiarity with React, Ember, and other modern frontend frameworks. 
• Exposure to cloud platforms, especially Google Cloud.  
• Hands-on experience with automated testing frameworks such as MochaJS, Selenium, or Cypress, and knowledge of CSS precompilers and build/package tools (e.g., Sass, Less, NPM, Grunt).

Important info about this role:   

• We’re better together. This role is fully on-site.

Salary Range

These pay ranges apply to employees in New Jersey, New York and 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.

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 [email protected]. 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.