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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Associate, Mainframe Infrastructure Testing Engineer - **Company:** The Depository Trust & Clearing Corporation - **Location:** Coppell, TX, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Computing Platforms, Bash Shell, Batch Processing, Customer Information Control System (CICS), Code Coverage, Cyber Security, Databases, IBM DB2, Disaster Recovery, Middleware, Failover, File Transfer, IBM Parallel Sysplex, Job Control Language (JCL), IBM Mainframe, IBM WebSphere MQ, Rexx (Programming Language), Intrusion Detection Systems, Job Entry Subsystem 2/3, Python (Programming Language), Mainframes, Automation of Marketing, Network Service, IBM Resource Access Control Facility, Ansible, Software Systems, System Programming, TCP/IP, Strategies of Testing, Z/OS, Scripting, File Transfer Protocol (FTP), Performance Testing, Software Troubleshooting, Git, Tools for Reporting, Jenkins, Control M - **Published:** October 1, 2026 - **Apply:** https://ebxr.fa.us2.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_1/requisitions/preview/214744 ## About the Role * Minimum of 6 years of related mainframe systems engineering, mainframe infrastructure testing, systems programming, production support, performance engineering, or platform architecture experience; 9 or more years preferred for candidates expected to operate as the primary onshore SME. * Hands-on or systems-level depth in IBM z/OS and several related technologies such as JCL, CICS, Db2, IBM MQ, RACF, TCP/IP, storage, or enterprise scheduling. * Demonstrated experience assessing complex infrastructure changes, identifying dependencies and failure modes, and translating technical risk into a practical test strategy. * Experience with capacity, stress, performance, extended-run, upgrade, migration, disaster-recovery, or production-readiness testing. * Experience working across engineering, operations, application, cybersecurity, architecture, and change-management teams. * Bachelor's degree is preferred, or equivalent relevant experience. * Financial services or other highly regulated, high-availability transaction-processing experience strongly preferred. Technical Skills: * Platform and architecture: IBM z/OS architecture and operating-system concepts; LPARs; Sysplex and Parallel Sysplex; workload distribution; IPL and system-startup concepts; environment health and dependency analysis. * Transaction, database, and messaging: Working knowledge of CICS, Db2 for z/OS, and IBM MQ for z/OS, including service dependencies and validation considerations. * Batch and scheduling: Strong JCL knowledge; JES2/JES3 concepts; batch workload analysis; job and dataset dependencies; restart and recovery; CA-7, ESP, Control-M, or comparable workload automation platforms. * Security and access: RACF concepts, privileged and non-privileged IDs, access controls across production, DR, and test environments. * Network and file transfer: FTP/SFTP, NDM/managed file transfer concepts and cross-platform connectivity. * Storage and resiliency: DASD and storage concepts, backup and recovery, replication, failover, disaster recovery, business continuity, and resiliency validation. * Testing and diagnostics: Risk-based test strategy, performance and capacity testing, extended-run testing, upgrade testing, defect analysis, expected return-code verification, logs and system messages, and evidence-based sign-off. * Automation: Ability to use scripting or automation to improve repeatability. Experience with REXX, Python, Shell, Ansible, Jenkins, Git, or comparable tools is beneficial. Talents Needed for Success: * Mainframe capacity stress testing and performance analysis. * Extended-run or endurance testing of business-critical workloads. * ESP migration or comparable scheduler migration and validation. * RIT Lab, DR, or lower-environment readiness and refresh validation. * z/OS and middleware upgrade testing. * Development of reusable mainframe test cases, validation scripts, dashboards, or evidence-collection automation * Systems thinking and the ability to connect mainframe services, application workloads, dependencies, failure modes, and business impact. * Strong troubleshooting and analytical skills, with disciplined attention to return codes, logs, schedules, system messages, and test evidence. * Ability to work independently as a trusted mainframe testing SME while collaborating effectively across technology organizations. * Clear written and verbal communication, including concise presentation of testing status, risks, defects, and recommendations to technical and leadership audiences. * Commitment to knowledge transfer, documentation, engineering quality, resiliency, accountability, and continuous improvement. ## Description We are seeking an experienced Senior Associate, Mainframe Infrastructure Testing Engineer to provide specialized systems knowledge and testing coverage across IBM mainframe services. This position combines systems-level mainframe expertise with environment management engineering. The engineer will assess change impacts, define and execute validation strategies, verify platform and workload readiness, analyze failures, and provide clear evidence-based recommendations for changes affecting critical services. The ideal candidate brings strong z/OS and mainframe ecosystem knowledge and understands that this is a testing position. The priority is deep systems expertise that can be applied to independent validation, with testing processes and DTCC-specific practices developed through onboarding and knowledge transfer. Your Primary Responsibilities: * Conduct planning, estimation, test design, execution, defect management, reporting, and stakeholder sign-off for mainframe infrastructure testing engagements. * Assess application-to-mainframe dependencies and change blast radius to determine affected systems, test scope, sequencing, regression needs, and operational risk. * Define risk-based coverage for z/OS, middleware, batch processing, scheduling, security, storage, networking, resiliency, and lower-environment readiness. * Validate mainframe upgrades and platform changes, including z/OS, middleware, security, encryption, automation, scheduling, and modernization initiatives. * Support Capacity Stress Testing and performance testing by evaluating workload behavior, resource utilization, system stability, bottlenecks, and test outcomes. * Validate non-production environments, including access, connectivity, services, and batch schedules. * Design or maintain test coverage for z/OS, Db2, CICS, IBM MQ, mainframe storage, TCP/IP/network services, and enterprise scheduling with clear, traceable test plans, test cases, results, defects, approvals, and audit evidence. * Analyze job failures, connectivity issues, middleware errors, performance degradation, and cross-platform integration defects; coordinate troubleshooting with engineering and application teams. * Partner with mainframe systems engineering, operations, architecture, cybersecurity, storage, network, database, scheduler, application, and change-management teams. * Automate repeatable validation and integrate test evidence with source-control, pipeline, workflow, or reporting tools. * Transfer specialized mainframe knowledge, mentor engineers, and reduce key-person dependency through documentation and cross-training. ## Related Videos - [Unlocking the Power of the Mainframe: Developing modern applications on z/OS](https://www.wearedevelopers.com/videos/764-unlocking-the-power-of-the-mainframe-developing-modern-applications-on-z-os) - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [SMART Test Automation - the experience of legacy transformation](https://www.wearedevelopers.com/videos/100215-smart-test-automation-the-experience-of-legacy-transformation) - [Turning Container security up to 11 with Capabilities](https://www.wearedevelopers.com/videos/718-turning-container-security-up-to-11-with-capabilities) - [Git for Code Reviews](https://www.wearedevelopers.com/videos/429-git-for-code-reviews) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Should senior developers refuse interview coding challenges?](https://www.wearedevelopers.com/magazine/29-should-senior-developers-refuse-interview-coding-challenges) - [The 8 Best Code Testing Tools](https://www.wearedevelopers.com/magazine/402-the-8-best-code-testing-tools) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers)