Sr. Systems Engineer – Mainframe API Services

U.S. Bank•Brookfield, WI

1d•$105,400 - $124,000•Hybrid

About The Position

U.S. Bank is seeking a Sr. Systems Engineer to support highly available mainframe API platforms and modernization initiatives. The 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. The position requires working from a U.S. Bank location three or more days per week and participating in a 24x7 on-call rotation.

Requirements

Bachelor’s degree or equivalent work experience.
At least 5 years of experience within a total information technology environment.
At least 10 years of experience with the design, development, and support of technology.

Nice To Haves

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.

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 a 24x7 on-call rotation.

Benefits

Healthcare coverage, including medical, dental, and vision.
Basic term and optional term life insurance.
Short-term and long-term disability coverage.
Pregnancy disability and parental leave.
401(k) and employer-funded retirement plan.
Paid vacation of 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 hours worked, up to 80 hours per calendar year unless otherwise provided by law.
Incentive and recognition programs.
Equity stock purchase, 401(k) contribution, and pension, subject to eligibility requirements.