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z/OS Software Developer

The candidate must have a solid understanding of the IBM Systems z mainframe and storage system architectures, as well as expertise in their interfaces, systems and services e.g. CCW/EXCP access to disk and tape storage systems, IOS sub-system, allocation / de-allocation, z/OS catalog internals, system exits, multi-tasking, FRR processing, resource serialization and real-time locking techniques. The candidates should have extensive hands-on experience developing z/OS system software products and have skills associated with writing to and reading from Cloud Storage and network storage (i.e. NFS,HTTP). Job Requirements Required: Minimum 10 years? experience in z/OS software development. Ability to write assembler programs utilizing z/OS supervisor state key zero, real memory, virtual memory, multi-processor locking and serialization, GRS, etc. Detailed knowledge of several of the following: Knowledge of RMM, CA-1 (TMS), TLMS and UNIX System Services (USS). Experience developing system intercepts in such components such as Open/Close, Allocation, EOV processing, Address Termination, etc. EXCP I/O level processing, with experience building channel programs, DIE exit processing, dynamic hook insertion and management in the IOS subsystem, as well as a detailed understanding of I/O interrupt handling (normal and abnormal) Expertise with one or more of the following subsystems: ?z/OS Systems Managed Storage catalog structures ?z/OS IOS control block structures ?z/OS disk and tape volume control block structures Knowledgeable with IOS level channel programming and overall IOS flow, including but not limited to control blocks and I/O flow such as the IOB, IOSB, CCW, FLIH and SLIH, Disabled Interrupt Exits, etc. Desired: Experience working with tape storage management related products, especially in the area of device and volume allocation management, data replication, tape media management systems and z/OS catalog management. Experience with TS7700 virtual tape libraries, EMC DLm Ability to diagnose problems using dumps and software tools e.g. IPCS, GTF, and XDC Experience with IBM and other vendors? problem management reporting systems For immediate consideration, please send an updated resume with salary requirement to Christopher.Ciuppa@rht.com

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