Omm3032J

Omm IT Solutions; Woodlawn (MD); On-site; USD 110,000 - 150,000; Full time

Job summary

Omm IT Solutions in Woodlawn, MD is seeking a Sr. Mainframe Developer to design, code, test, and modernize legacy IBM z/OS applications. This on-site role requires COBOL, CICS, DB2 skills and strong debugging abilities.

The candidate should have 5+ years of mainframe development experience, familiarity with JCL/ISPF/TSO, and the ability to work with client teams to deliver robust solutions. On-site work five days a week in Woodlawn, MD is required.

Qualifications

• Extensive experience building and maintaining IBM z/OS legacy applications.
• Expertise with COBOL, CICS, DB2, and JCL.
• Experience with mainframe tools and job scheduling.

Responsibilities

• Develop and maintain COBOL, REXX, JCL, CLIST, CICS, and DB2 code.
• Use mainframe utilities and diagnostic tools to support development and testing.
• Diagnose defects and implement updates for legacy applications.
• Collaborate with client and vendor teams to meet objectives.

Skills

Mainframe development

COBOL

CICS

JCL

DB2

SYNCSORT

File-AID

SuperC

Abend-AID

ISPF

TSO

JES

z/OS

Endevor

Control-M

Education

Master's degree +5 years experience

Bachelor's degree +7 years

13+ years experience in lieu of a degree

Tools

Endevor

Control-M

ISPF

TSO

JES

z/OS

Job description

Omm IT Solutions | Permanent W-2 Employee / Corp2Corp Contractor

Sr. Mainframe Developer

Woodlawn, United States | Posted on 11/10/2026

• Job Type Permanent W-2 Employee / Corp2Corp Contractor
• Compensation Negotiable
• State/Province Maryland
• Country United States
• Work Authorization Authorized to work in USA
• Background Check/Public Trust Clearance US Public Trust Clearance
• Job Opening ID Omm3032J

Job Description

PLEASE NOTE:

• IT IS 100% ONSITE POSITION.
• Selected candidate must be willing to work on-site in Woodlawn, MD 5 days a week.
• Selected candidate must be able to obtain and maintain a public trust clearance.
  

KEY REQUIRED SKILLS:

Mainframe development, COBOL, CICS, JCL, and DB2

POSITION DESCRIPTION:

• Develop and maintain COBOL, REXX, JCL, CLIST, CICS, and DB2 code and database structures in accordance with client standards and software engineering best practices.
• Use mainframe utilities and diagnostic tools, including SYNCSORT, File-AID, SuperC, Abend-AID, SPUFI, QMF, Xpediter, and InterTest.
• Perform unit testing and validate results against expected outcomes.
• Assess how database schema changes affect existing software components.
• Diagnose and resolve application defects involving COBOL, CICS configurations, DB2, business logic, and databases.
• Design, develop, test, debug, and implement modernized solutions for legacy applications using appropriate technologies and engineering practices.
• Create, update, and support JCL for reliable and efficient batch processing.
• Evaluate the effects of new operating systems and COBOL versions on the existing legacy application inventory.
• Collaborate with internal teams, client counterparts, and vendor teams. Provide technical guidance and help stakeholders achieve project and business objectives.
• Communicate status, risks, and technical information clearly to Leidos leads, client counterparts, teams, and vendors at the appropriate level of detail.
• Perform other duties as assigned or directed.
  

Requirements

BASIC QUALIFICATIONS:

• Master's and 5+ years of experience, Bachelor's and 7+ years of experience or 13+ years in lieu of a degree
• Eight to ten years of experience developing legacy applications on IBM z/OS.
  

REQUIRED SKILLS:

• Hands-on experience developing, debugging, and maintaining COBOL applications that use CICS, DB2, copybooks, and CICS maps.
  
• Hands-on experience with CICS applications, screen development and abends, including interactions between COBOL programs and BMS maps that define the user interface.
  
• Experience using Endevor or a comparable mainframe software configuration management system to manage legacy element workflows.
  
• Hands-on experience with ISPF, TSO, JES, z/OS, and mainframe utilities.
  
• Hands-on experience creating and modifying JCL for job execution, supporting batch jobs in day-to-day operations.
  
• Experience with Control-M or similar mainframe job-scheduling tool(s).
  
• Strong requirements elicitation, analytical, technical writing, and communication skills, including the ability to document project requirements and analysis.
  
• Strong attention to detail and a demonstrated ability to complete repetitive, integration/production-oriented tasks accurately and on time.
  
• Ability to research problems independently and develop effective solutions.
  

DESIRED SKILLS:

• Hands-on experience of the legacy technologies listed in job specification.
• Good understanding in SDLC specially in legacy development environment.
• Experience with modern development tools, software, AI tools, and methodologies.
• Familiarity with Agile frameworks, Agile terminology and Agile practices.
• Relevant certification, such as IBM Mainframe Developer Professional, or Interskill - IBM Mainframe Application Programmer, or IBM Mainframe Application Programmer – COBOL and IBM Enterprise COBOL for z/OS Programming
  

Education/Work Experience

Master's and 5+ years of experience, Bachelor's and 7+ years of experience or 13+ years in lieu of a degreeEight to ten years of experience developing legacy applications on IBM z/OS.