Senior Mainframe Developer

Compunnel, Inc.; New York (NY); On-site; USD 120,000 - 160,000; Full time

Job summary

Compunnel, Inc. in New York is seeking a Senior Mainframe Developer to lead COBOL/JCL development on critical enterprise applications.

You will screen, enhance, and maintain legacy mainframe software while participating in modernization efforts and system integration with distributed services. The role emphasizes high performance, adherence to coding standards, debugging, and collaborating with cross-functional teams to ensure reliable batch processing and secure operations.

Qualifications

• 8+ years of experience in Mainframe development
• Strong hands-on experience with: COBOL
• JCL (Job Control Language)
• Mainframe utilities (VSAM, DB2, CICS – as applicable)
• Experience with CCS / Control-M / similar job scheduling tools
• Experience with DB2
• CICS transaction processing
• Proven experience in code analysis, reverse engineering, and refactoring legacy systems
• Strong debugging and problem-solving skills
• Familiarity with batch processing and high-volume transaction systems
• Ability to work independently and in a team-oriented environment

Responsibilities

• Perform code screening, analysis, and scraping of existing mainframe applications to identify dependencies, inefficiencies, and improvement opportunities
• Design, develop, test, and maintain COBOL-based applications
• Develop and manage JCL jobs, including batch processing and scheduling workflows
• Work with CCS / Control-M / enterprise scheduling systems for job automation and monitoring
• Analyze legacy code and contribute to modernization strategies
• Collaborate with cross-functional teams to support integration with distributed systems or APIs
• Troubleshoot production issues, identify root causes, and implement fixes
• Ensure adherence to coding standards, performance guidelines, and security practices
• Document technical specifications, code changes, and system workflows
• Support QA/UAT cycles and deployment activities

Skills

COBOL

JCL

Control-M/CCS

Scheduling

Debugging

Legacy modernization

Independent worker

Tools

VSAM

DB2

CICS

Job description

Senior Mainframe Developer

We are seeking a Senior Mainframe Developer with strong expertise in COBOL, JCL, and Control-M/CCS (or similar scheduling systems) to support critical enterprise applications. The role involves code screening, analysis/scraping, enhancement, and development on legacy mainframe systems, along with participation in modernization and integration efforts. This individual will play a key role in maintaining high-performance, stable mainframe applications while contributing to system improvements and integration initiatives.

Key Responsibilities

• Perform code screening, analysis, and scraping of existing mainframe applications to identify dependencies, inefficiencies, and improvement opportunities
• Design, develop, test, and maintain COBOL-based applications
• Develop and manage JCL jobs, including batch processing and scheduling workflows
• Work with CCS / Control-M / enterprise scheduling systems for job automation and monitoring
• Analyze legacy code and contribute to modernization strategies
• Collaborate with cross-functional teams to support integration with distributed systems or APIs
• Troubleshoot production issues, identify root causes, and implement fixes
• Ensure adherence to coding standards, performance guidelines, and security practices
• Document technical specifications, code changes, and system workflows
• Support QA/UAT cycles and deployment activities

Required Qualifications

• 8+ years of experience in Mainframe development
• Strong hands-on experience with: COBOL
• JCL (Job Control Language)
• Mainframe utilities (VSAM, DB2, CICS – as applicable)
• Experience with CCS / Control-M / similar job scheduling tools
• Experience with DB2
• CICS transaction processing
• Proven experience in code analysis, reverse engineering, and refactoring legacy systems
• Strong debugging and problem-solving skills
• Familiarity with batch processing and high-volume transaction systems
• Ability to work independently and in a team-oriented environment

Preferred Qualifications

• Basic understanding of system integration concepts (APIs, middleware, web services)
• Exposure to mainframe modernization initiatives
• Familiarity with distributed systems or cloud integration
• Knowledge of DevOps practices for mainframe environments