Mainframe QA Engineer / Onsite in Plano

A leading enterprise technology organization is currently looking for a Senior Mainframe Quality Engineer to join its core platform engineering team. This role will support the testing and validation of a model-driven development platform used to build and maintain large-scale enterprise applications across mainframe and distributed environments.

In this role, you’ll work closely with developers, platform engineers, and stakeholders to ensure the quality and reliability of applications running in a mainframe (z/OS) environment. The ideal candidate brings strong experience in end-to-end testing, including system, integration, and acceptance testing, along with hands-on experience validating both legacy and modernized application workflows. This individual will play a key role in ensuring platform stability, supporting internal users, and improving overall testing practices across the environment.

It is a fully onsite position based in Plano, Texas.

Required Skills & Experience

• Bachelor’s degree in Computer Science, Information Technology, or a related field
• 5+ years of experience working in software quality assurance roles
• Hands-on experience testing mainframe-based applications (z/OS environment)
• Experience working with technologies such as COBOL, JCL, DB2, or CICS
• Strong understanding of end-to-end testing methodologies (system, integration, UAT)
• Experience creating, executing, and maintaining detailed test cases and test plans
• Experience identifying, documenting, and tracking defects using tools such as Jira
• Experience working in Agile or Scrum development environments
• Strong analytical, problem-solving, and communication skills
• Ability to work independently and take ownership of testing efforts

Desired Skills & Experience

• Experience with test automation (Python preferred, but not required)
• Exposure to mainframe tools such as TSO/ISPF or similar environments
• Experience working with messaging or middleware technologies (IBM MQ, etc.)
• Familiarity with modern development tools such as Git, CI/CD pipelines, or similar
• Experience supporting large-scale enterprise or platform-based applications
• Ability to learn and adapt to new tools and frameworks quickly

What You Will Be Doing
Tech Breakdown

• 70% Manual Testing (Mainframe /zOS)
• 30% Automation (Python based)

Daily Responsibilities

• 100% Hands on

The Offer

• Salary + Benefits

You will receive the following benefits:

• Medical, Dental, and Vision Insurance
• Vacation Time
• Stock Options

Applicants must be currently authorized to work in the US on a full-time basis now and in the future.