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Senior Systems Programmer – Legacy Systems

Teknita LLC -
Downey, CA

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Job Details

Qualifications

DB2
Systems architecture experience within technology
System performance optimization
System design
CICS
Assembly language
Computer hardware
Mainframe
Hardware support
Mentoring
Systems engineering
COBOL
Scripting
Mainframe development
Hardware management
IP networking
Capacity planning
System tuning
IT infrastructure planning

Full Job Description

Senior Systems Programmer – Legacy Systems

Job ID# 10TEK0852-031826 – Posted 03/18/2026 – Downey, CA

Key Responsibilities

We are seeking an experienced Senior Systems Programmer – Legacy Systems to support, maintain, and enhance enterprise z/OS mainframe environments. This role is responsible for both ongoing system maintenance and the development of operating system environments, ensuring optimal performance, security, and reliability.

The ideal candidate will bring deep expertise in mainframe technologies, strong leadership experience, and the ability to manage complex system upgrades and integrations with minimal downtime.

System Maintenance & Support

Plan and execute system upgrades in alignment with company-established schedules
Monitor and verify the health and performance of all z/OS systems
Analyze issues reported by development teams and provide recommendations and resolutions
Ensure compatibility between software applications and operating systems
Perform timely hardware upgrades with minimal disruption to operations
Apply patches and updates to security and system software regularly
Collaborate with stakeholders to test applications following system upgrades

Systems Development & Engineering

Analyze system requirements, risks, and cost considerations
Evaluate, select, and validate system software environments
Install and configure compilers, assemblers, and system utilities
Integrate hardware and software components across system environments
Monitor, fine-tune, and optimize system performance
Evaluate emerging technologies and assess their impact on the environment
Ensure security and information assurance policies are implemented and maintained

Required Skills:

Strong expertise in IBM mainframe technologies, including:
- z/OS, IMS, DB2, ADABAS
- SMP/E, JCL, IMS DB/DC, CICS
- ACF2 security, VTAM, TCP/IP, NetView
- Control-M, CA Spool
- Natural/SuperNatural, EntireX
- IMS & DB2 BMC Tools
- HMC, HOD, IODF, VTS
Proficiency in programming and scripting:
- Assembler, COBOL, REXX
Strong knowledge of system architecture, performance tuning, and capacity planning
Excellent troubleshooting and analytical skills
Ability to lead complex infrastructure initiatives and mentor junior staff
z/OS, HCD, z/OSMF
IBM z16 and z17 hardware platforms
CA ACF2 V17
Host On-Demand (HOD) V16.1

Experience Requirements

Minimum 7 years of experience in z/OS systems programming
At least 4 years in a lead or senior role managing complex mainframe environments

Education:

Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field

Additional Information:

This is a systems programming role (not a development role)—mainframe developer resumes will not be considered
Candidate must have extensive hands-on experience with mainframe hardware and system software
Initial three (3) weeks onsite required
Ongoing onsite presence required for major system upgrades

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Senior Systems Programmer – Legacy Systems

Key Responsibilities

System Maintenance & Support

Systems Development & Engineering

Required Skills:

Experience Requirements

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