Sr. Systems Engineer - Mainframe API Services

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 DescriptionU.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 ResponsibilitiesConfigure, 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 technologyPreferred Skills & ExperienceExtensive 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, 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.Location expectationsThis 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 insuranceShort-term and long-term disabilityPregnancy disability and parental leave401(k) and employer-funded retirement planPaid vacation (from two to five weeks depending on salary grade and tenure)Up to 11 paid holiday opportunitiesAdoption assistanceSick and Safe Leave accruals of one hour for every 30 worked, up to 80 hours per calendar year unless otherwise provided by lawReview our full benefits available by employment status here. U.S. Bank is an equal opportunity employer. We consider all qualified applicants without regard to race, religion, color, sex, national origin, age, sexual orientation, gender identity, disability or veteran status, and other factors protected under applicable law.E-VerifyU.S. Bank participates in the U.S. Department of Homeland Security E-Verify program in all facilities located in the United States and certain U.S. territories. The E-Verify program is an Internet-based employment eligibility verification system operated by the U.S. Citizenship and Immigration Services. Learn more about the E-Verify program.The salary range reflects figures based on the primary location, which is listed first. The actual range for the role may differ based on the location of the role. In addition to salary, U.S. Bank offers a comprehensive benefits package, including incentive and recognition programs, equity stock purchase 401(k) contribution and pension (all benefits are subject to eligibility requirements). Pay Range: $105,400.00 - $124,000.00U.S. Bank will consider qualified applicants with arrest or conviction records for employment. U.S. Bank conducts background checks consistent with applicable local laws, including the Los Angeles County Fair Chance Ordinance and the California Fair Chance Act as well as the San Francisco Fair Chance Ordinance. U.S. Bank is subject to, and conducts background checks consistent with the requirements of Section 19 of the Federal Deposit Insurance Act (FDIA). In addition, certain positions may also be subject to the requirements of FINRA, NMLS registration, Reg Z, Reg G, OFAC, the NFA, the FCPA, the Bank Secrecy Act, the SAFE Act, and/or federal guidelines applicable to an agreement, such as those related to ethics, safety, or operational procedures.Applicants must be able to comply with U.S. Bank policies and procedures including the Code of Ethics and Business Conduct and related workplace conduct and safety policies.Posting may be closed earlier due to high volume of applicants.Job SummaryJob number: 2026-0028237Date posted : 2026-11-02Profession: Technology & DigitalEmployment type: Full time