> Markdown version of [/jobs/ext/4518738-sr-systems-engineer-mainframe-api-services](https://www.wearedevelopers.com/jobs/ext/4518738-sr-systems-engineer-mainframe-api-services). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Sr. Systems Engineer - Mainframe API Services

- **Company:** U.S. Bank
- **Location:** Atlanta, GA, United States
- **Experience:** Expert
- **Salary:** $105,400.0 - $124,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Systems Engineering, Unix, Customer Information Control System (CICS), Disaster Recovery, Domain Name System (DNS), IBM Parallel Sysplex, Groovy, Monitoring of Systems, Hypertext Transfer Protocols (HTTP), Job Control Language (JCL), Rexx (Programming Language), JSON, Python (Programming Language), Mainframes, Software Maintenance, IBM Resource Access Control Facility, Shell Script, TCP/IP, Web Services, Z/OS, Datadog, Transport Layer Security, Git, Information Technology, Deployment Automation, Restful APIs, Jenkins
- **Published:** October 31, 2026
- **Apply:** https://dejobs.org/x/x/5312D4D07C2643129D21101E06726973/job/

## About the Role

* Bachelor's degree, or equivalent work experience
 * At least 5 years of experience within a total information technology (IT) environment
 * At least 10 years of experience with the design, development and support of technology

Preferred Skills & Experience

 * Extensive experience with IBM z/OS and mainframe infrastructure.
 * Hands-on expertise with IBM z/OS Connect, Liberty, and USS.
 * Strong knowledge of REST APIs, JSON, HTTP/HTTPS, CICS, TCP/IP, DNS, and TLS/SSL.
 * Experience with RACF/SAF, key rings, digital certificates, authentication, and authorization.
 * Experience with SMF, system logs, API monitoring, performance analysis, and troubleshooting.
 * Familiarity with Datadog or similar monitoring and observability tools.
 * Experience with Jenkins, Git, Python, Groovy/Java, REXX, shell scripting, and DevOps automation.
 * Working knowledge of JCL, SDSF, z/OS Sysplex, system operations, and high-availability environments.

## Description

U.S. Bank is seeking a Sr. Systems Engineer - Mainframe API Services to support highly available mainframe API platforms and modernization initiatives. This role requires hands-on expertise with IBM z/OS Connect, Unix System Services (USS), REST APIs, Liberty, and z/OS infrastructure, with a strong focus on reliability, security, automation, and performance., * Configure, administer, and support IBM z/OS Connect and Liberty in enterprise mainframe environments.

 * Support REST APIs integrating with CICS and z/OS applications and services.
 * Troubleshoot API, network, TLS, security, performance, and connectivity issues.
 * Administer z/OS Connect services within Unix System Services (USS).
 * Configure RACF/SAF, authentication, authorization, TLS certificates, and key rings.
 * Monitor API availability, performance, system health, and resiliency.
 * Automate deployment, configuration, monitoring, and operational processes using Jenkins, Git, Python, Java/Groovy, REXX, and shell scripting.
 * Support z/OS upgrades, software maintenance, disaster recovery, production resiliency, and 24x7 on-call rotation.