Mainframes Developer Jobs in Missouri (NOW HIRING)

Position Summary...As a Mainframe Senior Systems and Infrastructure Engineer, you will lead the maintenance, automation, and optimization of critical infrastructure systems software to ensure high availability and performance. This role involves designing and implementing scalable solutions and automating routine tasks using advanced scripting and configuration management tools. You will collaborate across teams to assess requirements, resolve complex issues, and support infrastructure growth aligned with business objectives. Your expertise will drive continuous improvement in system reliability, security, and operational efficiency within a dynamic technology environment.
About the team:
The Mainframe Independent Software Vendor team manages third-party software critical to operations, security, data management, scheduling, and connectivity. They ensure secure, reliable software deployment through ownership accountability, access controls, documentation, upgrades, vendor coordination, and compliance with enterprise standards. Serving as a bridge between engineering, security, audit, and vendors, the team accelerates issue resolution, reduces risk, supports audit readiness, and proactively addresses vulnerabilities. Their work helps maintain stable, secure, and resilient mainframe systems that support uninterrupted enterprise operations. What you'll do...

• Own the end-to end lifecycle of ISV products on z/OS, including installation, configuration, maintenance, upgrades, patching, and enhancements. 
• Lead complex incident investigation, root-cause analysis, and cross-team/vendor resolution to minimize risk/downtime. 
• Maintain centralized repositories of issues, resolutions, runbooks, configuration standards, and operational knowledge. 
• Ensure configuration standardization, release consistency, security remediation, and compliance with enterprise requirements. 
• Govern change management, access controls, audit readiness, documentation, and approval processes. 
• Monitor ISV health, performance, reliability, leveraging AI-assisted analytics to identify risks and accelerate resolution. 
• Provide technical leadership, mentor associates, and drive adoption of operational standards/best practices. 
• Develop automation and AI-enabled solutions using JCL, REXX, Python, SQL, and integration tooling to improve efficiency  

 
What you'll bring:
 
 
At Walmart, we offer competitive pay as well as performance-based bonus awards and other great benefits for a happier mind, body, and wallet. Health benefits include medical, vision and dental coverage. Financial benefits include 401(k), stock purchase and company-paid life insurance. Paid time off benefits include PTO (including sick leave), parental leave, family care leave, bereavement, jury duty, and voting. Other benefits include short-term and long-term disability, company discounts, Military Leave Pay, adoption and surrogacy expense reimbursement, and more. You will also receive PTO and/or PPTO that can be used for vacation, sick leave, holidays, or other purposes. The amount you receive depends on your job classification and length of employment. It will meet or exceed the requirements of paid sick leave laws, where applicable. For information about PTO, see https://one.walmart.com/notices. Live Better U is a Walmart-paid education benefit program for full-time and part-time associates in Walmart and Sam's Club facilities. Programs range from high school completion to bachelor's degrees, including English Language Learning and short-form certificates. Tuition, books, and fees are completely paid for by Walmart.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to a specific plan or program terms.
For information about benefits and eligibility, see One.Walmart.
The annual salary range for this position is $80,000.00 - $155,000.00 Additional compensation includes annual or quarterly performance bonuses. Additional compensation for certain positions may also include :
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Minimum Qualifications...

Outlined below are the required minimum qualifications for this position. If none are listed, there are no minimum qualifications.

Option 1: Bachelor's degree in computer science, computer engineering, information systems, information technology, or related area and 3 years’experience in technology infrastructure engineering across areas such as compute, storage, network, mobility or virtualization-related technologies.
Option 2: 5 years’ experience in technology infrastructure engineering across areas such as compute, storage, network, mobility or virtualization relatedtechnologies. Preferred Qualifications...

Outlined below are the optional preferred qualifications for this position. If none are listed, there are no preferred qualifications.

Master’s degree in computer science, computer engineering, information systems, information technology, or related area. and 1 Year of relevant experience in configuration management, developing automation for Provisioning and Orchestration, experience developing and managing service-level objectives (SLOs)/service level indicators (SLIs) for Infrastructure Service availability and performance., We value candidates with a background in creating inclusive digital experiences, demonstrating knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly. The ideal candidate would have knowledge of accessibility best practices and join us as we continue to create accessible products and services following Walmart’s accessibility standards and guidelines for supporting an inclusive culture. Primary Location... 805 Se Moberly Ln., Bentonville, AR 72712, United States of America Walmart and its subsidiaries are committed to maintaining a drug-free workplace and has a no tolerance policy regarding the use of illegal drugs and alcohol on the job. This policy applies to all employees and aims to create a safe and productive work environment.