Senior Mainframe Testing Engineer

The Depository Trust & Clearing Corporation (DTCC); Dallas (TX); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Base pay + annual incentive

Health and life insurance

Paid time off and well-being benefits

Hybrid work model (3 days onsite, 2 at

Remote

Job summary

DTCC is seeking a Senior Associate, Mainframe Infrastructure Testing Engineer to lead testing across IBM mainframe services and validate platform readiness. You will assess change impacts, design validation strategies, and provide evidence-based recommendations to ensure critical services remain reliable.

The role emphasizes deep z/OS expertise and independent validation, with onboarding to align DTCC practices.

Qualifications

• Minimum 6 years in mainframe systems engineering or testing.
• Hands-on depth in IBM z/OS and related technologies.
• Bachelor’s degree preferred or equivalent experience.

Responsibilities

• Plan, design, execute, and sign off on mainframe infrastructure testing.
• Assess dependencies, test scope, and risk for changes.
• Validate z/OS, middleware, and scheduling components across environments.
• Automate repeatable validation and document evidence for audits.
• Collaborate with cross-functional teams to ensure production readiness.

Skills

Mainframe testing

Capacity stress testing

Automation scripting

Test strategy

Risk assessment

Education

Bachelor’s degree or equivalent experience

Tools

JCL

CICS

Db2 for z/OS

IBM MQ

RACF

CA-7

Job description

DTCC is seeking a Senior Associate, Mainframe Infrastructure Testing Engineer to lead testing across IBM mainframe services and validate platform readiness. You will assess change impacts, design validation strategies, and provide evidence-based recommendations to ensure critical services remain reliable.

The role emphasizes deep z/OS expertise and independent validation, with onboarding to align DTCC practices.