Mainframe Developer — Modernization & Hybrid Role

Seneca Resources Company, LLC; Millbrook (AL); Hybrid; USD 95,000 - 130,000; Full time

Job summary

Seneca Resources Company, LLC is seeking a Mainframe Developer to support and modernize critical enterprise applications within an IBM z/OS environment. This role emphasizes COBOL, JCL, and DB2 work in a hybrid model based in Birmingham, AL.

You will design, develop, test, and maintain batch-processing and online programs, troubleshoot incidents, review logs, and contribute to mainframe modernization efforts in collaboration with analysts, QA, and infrastructure teams.

Qualifications

• 5+ years of experience in Mainframe Development, Software Engineering, or a related technical field.
• Experience with JCL (Job Control Language) and batch processing.
• Working knowledge of DB2 and SQL.
• Experience with or exposure to CICS transaction-processing environments.
• Understanding of the Software Development Life Cycle (SDLC).
• Strong analytical, problem-solving, and troubleshooting abilities.
• Ability to read, maintain, and enhance existing legacy applications and codebases.
• Excellent communication and collaboration skills.
• Ability to work effectively in a team-oriented environment.

Responsibilities

• Design, develop, test, maintain, and enhance applications in an IBM z/OS mainframe environment.
• Develop and support COBOL programs, JCL jobs, and batch-processing applications.
• Work with DB2 databases, including SQL development, data retrieval, and application integration.
• Analyze business requirements and implement application enhancements and fixes.
• Troubleshoot production incidents, batch failures, performance issues, and application defects.
• Review job logs, system messages, abends, and processing results to identify root causes and resolve issues.
• Participate in unit testing, integration testing, and regression testing activities.
• Create and maintain technical documentation, system specifications, and support procedures.
• Collaborate with developers, business analysts, QA teams, and infrastructure partners throughout the SDLC.
• Contribute to mainframe modernization, system integration, and digital transformation initiatives.
• Provide production support and participate in issue resolution efforts as needed.
• Follow coding standards, development best practices, and change-management processes.

Skills

Mainframe development

COBOL

JCL

DB2

SQL

CICS

SDLC

Troubleshooting

Team collaboration

Batch processing

Tools

VSAM

TSO/ISPF

IBM Utilities

File-AID

Control-M

Git

REST APIs

Job description

Seneca Resources Company, LLC is seeking a Mainframe Developer to support and modernize critical enterprise applications within an IBM z/OS environment. This role emphasizes COBOL, JCL, and DB2 work in a hybrid model based in Birmingham, AL.

You will design, develop, test, and maintain batch-processing and online programs, troubleshoot incidents, review logs, and contribute to mainframe modernization efforts in collaboration with analysts, QA, and infrastructure teams.