{"id":648233,"url":"https://alion.io/job/delanhq-mainframe-zos-system-programmer","title":"Mainframe ZOS System Programmer","company":{"id":690244,"name":"Delan Associates","domain":"delanhq.com","url":"https://alion.io/company/delanhq","size_band":"51-200","is_staffing_agency":false,"employer_type":"staffing","is_intermediary":false,"listed_via":null,"ats_vendor":"Breezy","truth_index":{"grade":"A","score":95,"open_postings":3,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":84,"computed_at":"2026-11-15T07:52:55Z"}},"role":"Enterprise Apps","role_family":"Enterprise Apps","seniority":null,"employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Phoenix, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":79000,"max_usd":171000,"period":"year","method":"role_country_seniority_unknown","sample_n":2118},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Db2","optional":false},{"name":"IMS","optional":false},{"name":"ITIL","optional":false},{"name":"ServiceNow","optional":false},{"name":"Unix","optional":false}],"status":"live","first_seen_at":"2026-08-05T13:47:04Z","employer_posted_date":"2026-08-05","last_verified_at":"2026-11-15T03:16:12Z","board_verified":true,"closed_at":null,"days_open":102,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":102},"description":"Job Title: Mainframe ZOS System Programmer\nLocation: Phoenix, AZ\nThe Mainframe z/OS System Programmer is responsible for the installation, customization, maintenance, and optimization of IBM z/OS operating systems and associated system software. This role ensures the stability, performance, security, and availability of mission-critical mainframe environments, supporting large-scale enterprise applications.\n* This role requires employees to live in or around the Phoenix, AZ area. You will be responsible to be onsite 3 days a week. We will consider candidates who are willing to relocate to the area.\nResponsibilities:\nSystem Administration & Maintenance:\nInstall, configure, and maintain IBM z/OS operating systems.\nPerform system upgrades, migrations (e.g., z/OS version upgrades), and apply maintenance (PTFs, APARs, RSUs).\nManage IPL processes, system initialization, and configuration (PARMLIB, PROCLIB, SYS1 datasets).\nMonitor system health and performance using tools such as RMF, SMF, SDSF.\nSubsystem Support:\nInstall, configure, and support key subsystems:\nJES2/JES3\nTSO/E, ISPF\nUSS (Unix System Services)\nRACF (in coordination with security teams)\nWork closely with DB2, CICS, IMS, MQ, and Storage teams for integration and support.\nPerformance & Capacity Management:\nAnalyze system performance metrics and implement tuning improvements.\nSupport capacity planning and resource optimization (CPU, memory, I/O).\nEvaluate hardware upgrades (e.g., CPU/MIPS growth, z-series enhancements).\nProblem Management & Troubleshooting:\nDiagnose and resolve system-related issues, including system abends and failures.\nPerform root cause analysis for outages and major incidents.\nWork with IBM and vendors on problem determination and fixes.\nAutomation & Scheduling:\nDevelop and maintain automation using tools such as:\nSystem REXX, CLIST\nSA z/OS, NetView\nSupport job scheduling tools (e.g., CA7, Control-M where applicable).\nSecurity & Compliance:\nSupport system-level security configurations aligned with RACF policies.\nEnsure compliance with audit, regulatory, and enterprise security standards.\nAssist in vulnerability remediation and patching activities.\nChange & Release Management:\nExecute changes through ITIL-based processes (ServiceNow or equivalent).\nPrepare implementation plans, backout procedures, and validation steps.\nSupport weekend maintenance windows and IPL activities.\nDocumentation:\nCreate and maintain technical documentation, including:\nSystem configurations\nStandard Operating Procedures (SOPs)\nDisaster Recovery 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