Sr. Systems Engineer – Mainframe API Services

Location: Earth City

At U.S. Bank, we’re on a journey to do our best. Helping the customers and businesses we serve to make better and smarter financial decisions and enabling the communities we support to grow and succeed.  We believe it takes all of us to bring our shared ambition to life, and each person is unique in their potential. A career with U.S. Bank gives you a wide, ever-growing range of opportunities to discover what makes you thrive at every stage of your career.

Try new things, learn new skills and discover what you excel at—all from Day One.

Job 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.

Key Responsibilities 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.

Basic Qualifications 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 Dev Ops automation.

Working knowledge of JCL, SDSF, z/OS Sysplex, system operations, and high-availability environments.

Location expectations

This role requires working from a U.S. Bank location three (3) or more days per week.

If there’s anything we can do to accommodate a disability during any portion of the application or hiring process, please refer to our disability accommodations for applicants. Benefits:

Our approach to benefits and total rewards considers our team members’ whole selves and what may be needed to thrive in and outside work. That's why our benefits are designed to help you and your family boost your health, protect your financial security and give you peace of mind. Our benefits include the following:

Healthcare (medical, dental, vision)
Basic term and optional term life insurance

Short-term and long-term disability

Pregnancy disability and parental leave
401(k) and employer-funded retirement plan

Paid vacation (from two to five weeks depending on salary grade and tenure)
Up to 11 paid holiday opportunities

Adoption assistance

Sick and Safe Leave accruals of one hour for every 30 worked, up to 80 hours per calendar year unless otherwise provided by law Review our full benefits available by employment status here. U.S. Bank is an equal…