Senior API Engineer - Advisor I

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

Senior API Engineer - Advisor I

About your role:

We are seeking a Software Engineer to join our engineering team at Fiserv. You’ll collaborate with product managers, clients at leading financial institutions, and cross‑functional engineering teams to design and deliver resilient, high‑volume solutions that leverage modern APIs, microservices, third‑party integrations and cloud infrastructure. Your work will help shape solution architecture and drive reliable, performant production systems.

What you’ll do

• Define and implement solution architecture for high‑volume, resilient systems.

• Design, develop, debug and test object‑oriented Java/J2EE code, Spring and RESTful APIs (JSON over

• Effective usage of AI for Software Engineering – Design/Coding/Code review/Debugging

• Hands-on working experience in Azure, and Containerization

• Build cloud‑native services following 12‑Factor principles and work with messaging platforms and integrations (Kafka, MQ, ESB).

• Collaborate in Agile/Scrum delivery model with product managers, clients and engineering teams.

• Contribute to CI/CD and DevSecOps practices to enable repeatable, secure deployments.

• Perform database integrations, JPA, performance tuning and optimization across relational and non‑relational stores.

• Apply design patterns and algorithmic approaches to improve reliability, maintainability, readability and performance.

• Troubleshoot and operate within complex IT environments, including networking, security and performance considerations.

• Cloud migration and platforms experience (Azure, PCF, OpenShift, AWS).

• Experience with Splunk and file transfer technologies (NDM / Connect: Direct / IBM FileGateway).

Experience you’ll need to have

• 8+ years recent experience as a member of engineering teams delivering resilient, high‑volume solutions built in Java/J2EE.

• 5+ years working on high‑volume transactional systems, including performance tuning.

• 5+ years hands‑on experience building RESTful APIs (JSON over with recent hands‑on experience with Java and Spring Frameworks (Spring Boot).

• 4+ years hands‑on experience designing, writing, debugging and testing object‑oriented code.

• Experience developing 12‑Factor cloud‑native services messaging architectures (Kafka, MQ, ESB).

• Experience with both relational and non‑relational database technologies (SQL and NoSQL).

• Advanced understanding of design patterns, software algorithms and coding techniques that improve testability and maintainability.

• High proficiency with modern CI/CD and DevSecOps practices.

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.

Travel

• Approximately 10% of travel off‑site or to other office locations is expected.

Sponsorship

• You must currently possess valid and unrestricted U.S. work authorization to be considered for this role. Individuals with temporary visas including, but not limited to, F‑1 (OPT, CPT, STEM), H‑1B, H‑2, or TN, or any candidate requiring sponsorship, now or in the future, will not be considered.

Salary Range

$90,000.00 - $158,400.00

These pay ranges apply to employees in New Jersey and New York. 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, 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 View email address on click.appcast.io . 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.