Mainframe Developer

Seneca Resources; Millbrook (AL); Hybrid; USD 90,000 - 130,000; Part time

Benefits offered by this job

Health insurance

Dental coverage

Vision coverage

401(k) retirement plan

Job summary

Seneca Resources is seeking a Mainframe Developer to support and modernize critical enterprise applications within an IBM mainframe environment. You'll design, develop, test, and maintain COBOL programs, JCL jobs, and batch-processing applications on IBM z/OS.

You will work with DB2 and SQL, support online transaction processing with CICS, and participate in modernization initiatives that link legacy platforms with modern tech. Strong SDLC understanding and collaboration skills are required.

Qualifications

• 5+ years in Mainframe Development or related field.
• Hands-on COBOL development experience.
• Experience with JCL and batch processing.
• Working knowledge of DB2 and SQL.
• Experience with or exposure to CICS environments.
• Understanding of SDLC.
• Strong analytical and problem-solving skills.
• Excellent communication and collaboration abilities.

Responsibilities

• Design, develop, test, and maintain applications in an IBM z/OS mainframe environment.
• Develop and support COBOL programs, JCL jobs, and batch-processing apps.
• Work with DB2 databases, including SQL development and data retrieval.
• Support online transaction processing using CICS.
• Analyze requirements and implement enhancements and fixes.
• Troubleshoot production incidents, batch failures, and performance issues.
• Review logs and abends to identify root causes and resolve issues.
• Participate in unit, integration, and regression testing.
• Create and maintain technical docs and system specs.
• Collaborate with developers, analysts, QA, and infra teams through SDLC.
• Contribute to mainframe modernization and system integration initiatives.
• Provide production support and participate in issue resolution.

Skills

COBOL

DB2

CICS

JCL

SQL

SDLC

Batch processing

Mainframe z/OS

Troubleshooting

Tools

IBM z/OS

VSAM

TSO/ISPF

Control-M

Job description

Position Title: Mainframe Developer (COBOL / DB2 / CICS)

Location: Hybrid - 3 Days Onsite per Week | Birmingham, AL

Position Status: Contract-to-Hire | 6 Months

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
• Support online transaction processing utilizing CICS
• 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
• Hands-on experience developing applications using COBOL
• 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.
• IBM z/OS
• VSAM
• TSO/ISPF
• IBM Utilities
• File-AID
• Abend-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.