Mainframe Developer

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

Location:

Hybrid - 3 Days Onsite per Week | Birmingham, AL

Position Description:

We're seeking a Mainframe Developer to help support and modernize critical enterprise applications within our IBM mainframe environment. This role is ideal for a developer who enjoys solving complex business problems, maintaining high-performance systems, and contributing to modernization initiatives that connect legacy platforms with modern technologies.

What You'll Do

As a Mainframe Developer, you will:

• 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

Required 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

Preferred Qualifications

• Experience in the financial services, banking, insurance, or highly regulated industries is highly valued.


• VSAM


• TSO/ISPF


• IBM Utilities


• File-AID


• Control-M or other enterprise job scheduling tools


• Git or modern source control platforms


• REST APIs and mainframe integration technologies


• Agile or Scrum development methodologies


• Mainframe modernization initiatives


• Cloud integration projects


• DevOps tools and CI/CD practices

About Seneca Resources:

At Seneca Resources, we are more than just a staffing and consulting firm, we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact.

When you work with Seneca, you’re choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. We take the time to understand your goals and match you with roles that align with your skills and career path. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team who will advocate for you every step of the way.