Calibro Corp.
Job Title: Mainframe Systems Programmer - z/OS 3.1 Migration & z/OSMF Specialist
Location:
Remote, EST or CST Type:
Contract
Job Summary:
We are seeking a seasoned
Mainframe Systems Programmer
to support and optimize our IBM z/OS infrastructure, with a strong focus on
post-migration support for z/OS 3.1
and
z/OSMF version 15
. The ideal candidate will have recent experience upgrading and stabilizing environments following a major system version change. You will play a critical role in maintaining system health, resolving compatibility issues, and leveraging z/OSMF for automation and system management.
Key Responsibilities: Provide technical support and maintenance for IBM z/OS (v3.1) and related mainframe subsystems. Configure, manage, and troubleshoot
z/OSMF v15
, including workflows, software management, cloud provisioning, and REST API integrations. Ensure full operational stability and compatibility following the migration from z/OS 2.1 to 3.1. Work with cross-functional teams to resolve post-upgrade issues (e.g., IPL errors, software compatibility, certificate updates). Maintain SMP/E environments and perform ongoing RSU maintenance, patching, and software installs. Implement and support z/OS 3.1 features such as zCX, AI Framework, enhanced System Recovery Boost, and encryption enhancements. Maintain system security with a focus on
RACF enhancements and multi-factor authentication support
. Contribute to disaster recovery planning and testing; maintain documentation and system procedures. Monitor system performance, capacity planning, and apply tuning as needed. Required Skills and Experience:
7+ years as a Mainframe Systems Programmer, with strong expertise in IBM z/OS. Direct experience with
z/OS 3.1
, including support for post-migration environments. Proven ability to configure and troubleshoot
z/OSMF v15
, including workflow setup and REST APIs. Deep understanding of SMP/E, JCL, REXX, ISPF, TSO, and IBM utilities. Familiarity with mainframe security tools such as
RACF
, and understanding of MFA configurations. Experience with system monitoring and diagnostic tools (e.g., RMF, SMF, OMEGAMON). Familiarity with subsystems like CICS, DB2, or IMS is preferred. Experience with or exposure to container technology on z/OS (e.g.,
zCX
) is a plus. Preferred Qualifications:
Bachelor's degree in Computer Science or related field. IBM certifications (e.g., IBM Certified System Programmer - z/OS). Exposure to automation frameworks (e.g., Ansible, Python scripting on z/OS) is a bonus. dditional Notes:
On-call support may be required. Some after-hours work may be needed during IPLs or critical maintenance windows. Must be able to document system configurations and standard operating procedures clearly.
Calibro Corp. is a professional staffing and services firm specializing in the technology areas of Project Management, Business Analysis, Infrastructure and Development. We offer great benefits to both salaried and hourly employees including medical, dental, vision, 401k with match. Calibro Corp is committed to providing the highest levels of professional services to job seekers and employers. Reach out to our staffing specialists to experience the difference!
Location:
Remote, EST or CST Type:
Contract
Job Summary:
We are seeking a seasoned
Mainframe Systems Programmer
to support and optimize our IBM z/OS infrastructure, with a strong focus on
post-migration support for z/OS 3.1
and
z/OSMF version 15
. The ideal candidate will have recent experience upgrading and stabilizing environments following a major system version change. You will play a critical role in maintaining system health, resolving compatibility issues, and leveraging z/OSMF for automation and system management.
Key Responsibilities: Provide technical support and maintenance for IBM z/OS (v3.1) and related mainframe subsystems. Configure, manage, and troubleshoot
z/OSMF v15
, including workflows, software management, cloud provisioning, and REST API integrations. Ensure full operational stability and compatibility following the migration from z/OS 2.1 to 3.1. Work with cross-functional teams to resolve post-upgrade issues (e.g., IPL errors, software compatibility, certificate updates). Maintain SMP/E environments and perform ongoing RSU maintenance, patching, and software installs. Implement and support z/OS 3.1 features such as zCX, AI Framework, enhanced System Recovery Boost, and encryption enhancements. Maintain system security with a focus on
RACF enhancements and multi-factor authentication support
. Contribute to disaster recovery planning and testing; maintain documentation and system procedures. Monitor system performance, capacity planning, and apply tuning as needed. Required Skills and Experience:
7+ years as a Mainframe Systems Programmer, with strong expertise in IBM z/OS. Direct experience with
z/OS 3.1
, including support for post-migration environments. Proven ability to configure and troubleshoot
z/OSMF v15
, including workflow setup and REST APIs. Deep understanding of SMP/E, JCL, REXX, ISPF, TSO, and IBM utilities. Familiarity with mainframe security tools such as
RACF
, and understanding of MFA configurations. Experience with system monitoring and diagnostic tools (e.g., RMF, SMF, OMEGAMON). Familiarity with subsystems like CICS, DB2, or IMS is preferred. Experience with or exposure to container technology on z/OS (e.g.,
zCX
) is a plus. Preferred Qualifications:
Bachelor's degree in Computer Science or related field. IBM certifications (e.g., IBM Certified System Programmer - z/OS). Exposure to automation frameworks (e.g., Ansible, Python scripting on z/OS) is a bonus. dditional Notes:
On-call support may be required. Some after-hours work may be needed during IPLs or critical maintenance windows. Must be able to document system configurations and standard operating procedures clearly.
Calibro Corp. is a professional staffing and services firm specializing in the technology areas of Project Management, Business Analysis, Infrastructure and Development. We offer great benefits to both salaried and hourly employees including medical, dental, vision, 401k with match. Calibro Corp is committed to providing the highest levels of professional services to job seekers and employers. Reach out to our staffing specialists to experience the difference!