Technology System Specialist III

We are seeking an IBM Mainframe Full-Stack Systems Engineer experienced with end-to-end engineering and modernization of large-scale enterprise IBM Z environments. This role requires deep, hands-on expertise across multiple z/OS versions, core subsystems, security platforms, storage, networking, virtualization, and performance management in highly regulated, mission-critical environments. This role is engineering-first, focused on architecture, deep technical analysis, system tuning, and modernization readiness. The engineer will play a critical role in proofing the mainframe platform, ensuring technical compatibility, stability, and performance as the stack evolves.

Core Responsibilities

z/OS Platform Modernization & Upgrade Engineering

Engineer for multiple concurrent legacy and current z/OS versions including Version interoperability, Incremental upgrade paths, Dependency validation across the stack, Pre-upgrade technical assessments, Post-upgrade stabilization, and tuning Full-Stack Mainframe Engineering (Subsystem Depth) - Provide deep system-level engineering expertise across the core IBM Z stack i.e. but not limited to:

DB2 for z/OS - Subsystem configuration, performance characteristics, and version interactions CICS TS - System-level behavior, workload tuning, and modernization readiness, TLS enablement impacts IMS (DB/DC) - Platform interaction, efficient tuning, and coexistence with modern stacks IBM MQ for z/OS - Queue Manager architecture and configuration, MQ subsystem behavior across z/OS and middleware upgrades, Performance tuning (buffer pools, logging behavior, workload patterns), Dependency analysis with CICS, DB2 for z/OS, IMS, and distributed platforms. TLS enabled channel architecture and modernization Common enterprise schedulers (e.g., CA-7, Control-M) and other ISV tooling Compiler and language versions and when recompilations are necessary during upgrades Common mainframe integrations, including Change Data Capture (CDC) tools, Extract, Transform, and Load (ETL) tools, and DB2 Gateway Mainframe terminal emulators Maintain a holistic view of cross-subsystem dependencies during upgrades

Storage, Networking & Virtualization Engineering, providing engineering insight into:

Mainframe storage behavior, layout, and recovery implications during modernization Mainframe networking, including SNA, VTAM, and TCP/IP interactions Design around z/VM and virtualized environments Identify infrastructure constraints that limit modernization or performance gains

Security Engineering

Review and engineer as needed for RACF and ACF2 security platforms to maintain access controls, profiles, auditing, logging, and compliance enforcement Partner as needed with risk, audit, and application teams to review and ensure policy alignment and regulatory compliance Mainframe security best practices, including encrypting data in transit

Leverage SMF, RMF, and operational metrics to analyze system performance, Identify bottlenecks, support capacity planning, and forecasting

Review and recommend tuning system parameters and subsystem configurations to optimize throughput, response time, and cost efficiency Help identify trends and risks impacting availability or scalability

Review and recommend operational tasks automation opportunities using REXX, CLIST, JCL, TSO/ISPF, reducing manual effort through automation, standardization, and self-healing processes

Collaboration & Leadership - Partner with Application teams, Middleware teams, Security & risk organizations, and Vendors (IBM and ISVs)

8-12+ years of hands-on IBM Mainframe experience in large enterprise environments Strong expertise with: Multiple z/OS versions and upgrades, z/VM, RACF and ACF2, DB2 for z/OS, CICS, IMS, MQ, TLS Encryption, Mainframe storage, and networking (including SNA) SMF, performance monitoring, and capacity management

Advanced skills with JCL, REXX/CLIST, TSO/ISPF Strong troubleshooting, RCA, and documentation skills Experience in regulated environments (financial services, insurance, government preferred)

Education: Bachelor’s degree in computer science, Engineering, or equivalent experience

InterSources Inc, a Certified Diverse Supplier, was founded in 2007 and offers innovative solutions to help clients with Digital Transformations across various domains and industries. Our history spans over 19 years and today we are an Award-Winning Global Software Consultancy solving complex problems with technology. We recognize that our employees and our clients are our strengths as the diverse talents and opportunities they bring to the table enable us to grow as a global platform and they are causally linked with our success. We provide strategic and technical advice, and we have expertise in areas covering Artificial Intelligence, Cloud Migration, Custom Software Development, Data Analytics Infrastructure & Cloud Solutions, Cyber Security Services, etc. We make reasonable accommodations for clients and employees and we do not discriminate based on any protected attribute including race, religion, color, national origin, gender sexual orientation, gender identity, age, or marital status. We also are a Google Cloud partner company. We align strategy with execution and provide secure service solutions by developing and using the latest technologies that thrive our resources to deliver industry-leading capabilities to our clients and customers, making it convenient for our clients to do business with InterSources Inc. Our teams also drive growth by refining technology-driven client experiences that put the users first, providing an unparalleled experience. This results in strengthening the core technologies of clients, enabling them to scale with flexibility, create seamless digital experiences and build lifelong relationships.