Senior z/OS Platform Engineer

Software Engineering

McMaster-Carr is hiring a Senior z/OS Platform Engineer in Chicago, Illinois. Posted 7 November 2025. Apply directly on McMaster-Carr's own careers site — no account needed.

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Who We Are

McMaster-Carr is a leading e-commerce company that industrial customers have trusted for over 120 years. Our products help them get manufacturing lines back up quickly, keep operations running smoothly, and prototype the next generation of innovative solutions. We earn and keep that trust by offering the right products, making them easy to find, and delivering them fast, so our customers can solve problems with greater speed, precision, and ease.

Our industry-leading e-commerce experience, indispensable product selection, and world-class service bring hundreds of thousands of customers to our site each day. But we’re never standing still. Our curious, exceptional people are at the heart of our evolution. They turn new challenges and disruptive technologies into opportunities to refine our operations, expand our offering, and deliver a better experience for every customer.

How You'll Make An Impact
Our technology team builds the software that powers our e-commerce experience and our world-class operations. From customer-facing web features to distribution center automation, we design and scale critical systems that enable McMaster-Carr to deliver same-day or next-day orders reliably and efficiently. As a Senior z/OS Platform Engineer, you’ll work on projects like:

Re-imagining our COBOL development lifecycle, incorporating VSCode, Zowe, and CI/CD pipelines.
Designing and transitioning to a new data layout for critical subsystems to meet recovery time objectives.
Upgrading DB2 and other fundamental platform components with comprehensive assessment of dependencies and robust risk mitigation practices.
Detecting and analyzing trends in z operations to optimize resource use and development velocity.

What You'll Do
As a Senior z/OS Platform Engineer you will:

Perform a broad range of mainframe infrastructure tasks, including supporting CICS and Db2 subsystems, applying system maintenance, and replacing physical hardware.
Write code to enhance the availability, resiliency, and efficiency of mainframe software and systems that bring value to customers.
Leverage application, resource, and system data to drive down costs and support company goals and strategies.
Build technical knowledge through learning groups, book clubs, and one-on-one mentoring.

Who You Are
We’re looking for curious, driven engineers who thrive in collaborative environments and love solving hard problems. Ideal candidates will have:

At least 3 years of experience with technologies such as z/OS, CICS, Db2, JCL, SMP/E, SMS/ACS, Networking, z/OSMF, and Zowe.
A thoughtful, analytical approach to problem-solving and technical design.
Clear, confident communication skills across technical and non-technical audiences.
Interest in mentoring, coaching, and growing as a leader.

Cash Compensation

Total cash compensation is generally around $235,000 to $310,000 and includes a profit sharing based on company profitability.
You will also receive a relocation stipend and signing bonus.

Benefits

Growth & Learning

100% tuition reimbursement
Informal and formal mentorship
Employee resource groups

Health & Wellbeing

Medical, dental, pharmacy, and vision plans with no monthly premiums
Inclusive, all-gender benefits

Family & Future

Paid parental leave for all new parents
Adoption and surrogacy assistance
First-time home buyer assistance
Industry-leading company-funded retirement accounts

Time Off

Paid vacation and personal time

Equal Opportunity Employer

We are proud to be an Equal Opportunity Employer and dedicated to providing employees a workplace with reasonable accommodations and free of discrimination, harassment, and retaliation. At McMaster-Carr, we do not make employment decisions based on age, ethnicity, citizenship status, military status, gender identity and expression, race, religion, disability status, marital status, sexual orientation, or any other legally protected group.

This position is not eligible for work authorization sponsorship by McMaster-Carr.

Data We Collect

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