Senior Mainframe Developer

Serigor Inc; Columbia (MD); On-site; USD 140,000 - 190,000; Full time

Job summary

Serigor Inc. in the United States seeks a Senior Mainframe Developer to drive modernization of IBM mainframe systems in complex enterprise environments.

You will analyze, design, and implement strategies that transform legacy COBOL/JCL/CICS/VSAM/DB2/IMS workloads, collaborating with stakeholders and engineering teams to deliver scalable migration initiatives. The role requires hands-on expertise, leadership in modernization programs, and the ability to work across architectural and DevOps teams

Qualifications

• 10-15 years of hands-on experience with enterprise Mainframe applications.
• Strong expertise in COBOL, JCL/PROCs, CICS, VSAM, DB2, IMS, and BMS Maps.
• Experience with batch processing systems and legacy workflows.
• Proven ability to lead modernization programs and engage stakeholders.

Responsibilities

• Analyze, maintain, support, and modernize large-scale Mainframe applications.
• Lead modernization workshops and system assessment sessions with clients.
• Serve as primary Mainframe POC for modernization activities and integrations.
• Document business rules, data mappings, and technical processes.
• Collaborate with architects, QA, DevOps, and business analysts on modernization.
• Support data migration, validation, and stabilization activities.
• Troubleshoot production issues and optimize batch workloads.
• Provide mentorship and technical guidance to engineering teams.

Skills

COBOL

JCL/PROCs

CICS

VSAM

DB2

IMS

BMS Maps

Batch processing

Enterprise modernization

Technical leadership

Stakeholder management

Code analysis tools

Tools

Automated code analysis tools

Transformation pipelines

Modernization accelerators

AI-assisted code analysis

Job description

We are seeking a Senior Mainframe Developer to support enterprise modernization and transformation initiatives involving complex IBM Mainframe systems.

This role requires deep hands-on expertise in Mainframe technologies, legacy application analysis, modernization strategies, and technical expertise. The ideal candidate will perform assessment and modernization efforts, collaborate with client stakeholders and engineering teams, and support large-scale migration initiatives in enterprise environments.

Key Responsibilities

• Analyze, maintain, support, and modernize large-scale Mainframe applications and legacy systems
• Work extensively with:
• COBOL
• JCL and PROCs
• CICS
• VSAM
• DB2
• IMS
• BMS Maps
• Batch processing environments
• Perform technical discussions, modernization workshops, and system assessment sessions with client stakeholders
• Serve as the primary Mainframe technical POC for modernization activities, dependencies, and integration efforts
• Analyze legacy business workflows, application logic, system integrations, and data dependencies
• Recommend modernization, migration, remediation, and transformation strategies
• Support automated code analysis, remediation, and modernization workflows
• Document business rules, technical processes, data mappings, reconciliation logic, and functional behavior
• Collaborate with architects, QA teams, DevOps teams, business analysts, and cross-functional engineering teams
• Perform source code inventory analysis, dependency mapping, and technical assessment activities
• Support reconciliation, validation, testing, and stabilization activities
• Assist with enterprise data migration and synchronization initiatives
• Troubleshoot production issues, optimize batch workloads, and support application enhancements
• Participate in modernization factory workflows, including automated analysis and transformation activities
• Prepare technical documentation, modernization artifacts, operational runbooks, and system analysis reports
• Provide mentorship and technical expertise to engineering and modernization teams

Required Qualifications

• 10-15 years of hands-on experience with enterprise Mainframe applications
• Strong expertise with:
• COBOL
• JCL and PROCs
• CICS
• VSAM
• DB2
• IMS
• BMS Maps
• Batch processing systems
• Strong understanding of:
• Transaction processing systems
• Batch processing frameworks
• Legacy application workflows
• Experience working with automated code analysis tools, transformation pipelines, and modernization accelerators
• Strong client-facing communication and stakeholder management skills
• Experience serving as a technical lead on enterprise modernization programs
• Strong understanding of enterprise business processes, data flows, and system dependencies
• Exposure to:
• Distributed systems
• APIs and middleware
• Hybrid integration architectures
• Familiarity with AWS and/or Azure environments
• Strong troubleshooting, analytical, and problem-solving skills
• Ability to drive technical modernization activities independently and hands-on in fast-paced enterprise environments
• Excellent written and verbal communication skills

Preferred Qualifications

• Experience supporting enterprise modernization and migration programs
• Experience with AI-assisted code analysis and remediation workflows
• Experience working with modernization factories, automated conversion tools, and migration accelerators
• Experience working in Agile/Scrum delivery environments
• Experience supporting government, financial, healthcare, tax, or other large enterprise modernization programs
• Familiarity with cloud-native modernization and hybrid cloud integration strategies