Java/API Developer
Confirmed on the employer's own hiring board on Oct 15, 2026. First seen by Alion on Oct 15, 2026. FIS scores A on the Alion truth index.
Job Description
Every day at FIS, innovators, problem solvers and changemakers work together to create technology that advances the world of finance. We embrace new ideas, challenge what's possible and empower our teams to make a lasting impact. If you're ready to help shape the future of fintech, unlock your next chapter with FIS.
Role location - Jacksonville (Hybrid)
About the role
As a Java Developer/API Developer, you will develop, enhance and provide production support for Java-based middleware applications and application programming interfaces (APIs). You will work across Xpress middleware and Code Connect APIs running on WSO2 environments, with a strong focus on application security vulnerability remediation. You will also troubleshoot production incidents, monitor application alerts and participate in a 24x7 on-call rotation every six to eight weeks.
Your key responsibilities
- Lead the design and development of customer-requested enhancements and provide production support for Xpress middleware services and legacy middleware components that integrate with core banking systems.
- Develop, enhance and support Code Connect APIs using REST, SOAP, web services, YAML, Swagger definitions, WSO2 API Manager and WSO2 Enterprise Integrator.
- Remediate static-code, open-source and AI-identified security vulnerabilities using Checkmarx One (CxOne) and Mythos across Java and API code.
- Investigate production issues and monitor Splunk and ThousandEyes alerts to help identify application or architecture-related issues.
- Collaborate with other application teams on enhancements, troubleshooting and production support, including responding to escalations and ServiceNow incidents during scheduled on-call coverage.
What you bring
Required qualifications
- 6-10 years of Java development experience with strong object-oriented programming skills; API development experience includes Spring Core, Spring Integration and multi-layered architectures.
- Strong knowledge of REST and SOAP web services, Swagger, YAML, XML, JSON, XML Schema Definition (XSD), JSON Schema and data transformation technologies.
- Experience with relational database management systems, Structured Query Language (SQL), database management systems and Java Database Connectivity (JDBC).
- Working knowledge of application security remediation, including static application security testing and software composition analysis using Checkmarx One (CxOne), as well as addressing vulnerabilities in Java and API code.
- Ability to provide production support and participate in a 24x7 on-call rotation for one week every six to eight weeks.
Preferred qualifications
- Experience with Xpress application programming and implementations, including IFX schemas, WebSphere application server configuration and CICS applications.
- Knowledge of WSO2 API Manager, Analytics and Enterprise Integrator, as well as Splunk monitoring.
- Banking industry experience.
The impact you’ll make
As a Java Developer/API Developer, you will help maintain and enhance middleware and API services used by hosted and non-hosted clients. Your work will strengthen application security through vulnerability remediation while supporting reliable production services. You will also contribute to incident response, troubleshooting and enhancements across interconnected applications and banking platforms.
What we offer you
When you join FIS, you become part of a team that's shaping how the world pays, banks and invests. We’re committed to helping you thrive, both professionally and personally.
At FIS, we offer you:
- Internal career growth opportunities
- A voice in the future of fintech
- Always-on learning and development
- Collaborative work environment
- Opportunities to give back
Privacy Statement
FIS is committed to protecting the privacy and security of all personal information that we process in order to provide services to our clients. For specific information on how FIS protects personal information online, please see the Online Privacy Notice.
EEOC Statement
FIS is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, marital status, genetic information, national origin, disability, veteran status, and other protected characteristics. The EEO is the Law poster is available here supplement document available here
For positions located in the US, the following conditions apply. If you are made a conditional offer of employment, you will be required to undergo a drug test. ADA Disclaimer: In developing this job description care was taken to include all competencies needed to successfully perform in this position. However, for Americans with Disabilities Act (ADA) purposes, the essential functions of the job may or may not have been described for purposes of ADA reasonable accommodation. All reasonable accommodation requests will be reviewed and evaluated on a case-by-case basis.
Sourcing Model
Recruitment at FIS works primarily on a direct sourcing model; a relatively small portion of our hiring is through recruitment agencies. FIS does not accept resumes from recruitment agencies which are not on the preferred supplier list and is not responsible for any related fees for resumes submitted to job postings, our employees, or any other part of our company.