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Workstate

Senior COBOL Developer – z/OS

Workstate

. Convert legacy RPG II programs into well-structured, maintainable COBOL on z/OS .

Posted 10/3/2026contractRemote • Colombia, ArgentinaSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in COBOL development on IBM z/OS mainframes, with strong skills in SQL, JCL, and data management. Proficient in legacy modernization and mainframe migration projects, ensuring code integrity and effective communication in professional settings.

Highest-signal resume keywords
COBOL DevelopmentSQL (DB2 For Z/OS)JCLMainframe MigrationAgile Methodology

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
COBOLSQLJCLVSAMDB2CICSRPG IIData ValidationBatch ProcessingCode Conversion
Soft Skills
Effective Communication
Tools & Technologies
GCPRaincodeGitEndevorChangeMan
Industry Keywords
Legacy ModernizationMainframe UtilitiesData ModelingParallel TestingTechnical Documentation

Tech Stack

Tools & technologies
Google Cloud PlatformSQL

About the role

Key responsibilities & impact
  • Convert legacy RPG II programs into well-structured, maintainable COBOL on z/OS
  • Analyze existing program logic, file layouts and data flows to ensure converted code behaves the same way
  • Develop and maintain JCL, batch job streams and related utilities
  • Write and tune SQL (DB2 for z/OS) and work with VSAM and sequential datasets
  • Participate in unit, regression and parallel testing, including data validation and reconciliation between legacy and converted output
  • Prepare code and data for rehosting on GCP with the Raincode compiler and runtime
  • Document converted programs, data dependencies and technical decisions
  • Work with the client's technical and migration teams in an Agile setting

Requirements

What you’ll need
  • 6+ years of professional COBOL development experience on IBM z/OS mainframes
  • Strong SQL and data skills, especially DB2 for z/OS (embedded SQL, query tuning, data modeling)
  • JCL, TSO/ISPF and batch processing
  • VSAM, QSAM/sequential files and GDGs
  • Mainframe utilities such as DFSORT/SYNCSORT and IDCAMS
  • CICS
  • Experience with legacy modernization, code conversion or mainframe migration projects
  • Experience with mainframe rehosting or emulation platforms (Raincode, Micro Focus/Rocket Enterprise Server) or GCP
  • Experience with source control and change management tools (Git, Endevor, ChangeMan)
  • Experience with data validation, reconciliation and parallel-run testing
  • B2 level (upper-intermediate) or higher English language competency with ability to communicate effectively in professional settings, both written and verbal
  • Experience with RPG II or other IBM midrange languages is a plus but is not required