Mainframe Developer

WHO WE ARE: Founded in 2007, DTI (Diversified Technology, Inc.) is a successful African American owned IT Consulting/Staffing firm based in Chicago's Loop. WHAT WE DO: We focus on providing delivery, staffing, and supported services such as enterprise integration/implementations including, but not limited to, CRM, EAM, ERP, PMO, and QA. We service clients in SLED (state/local gov't & education), financial services, fortune, public utility, as well as regularly partnering with Big 4 SI partners. Mainframe Developer Duration: 03/02/2026 - 02/01/2027 Type: Contract Experience Required: 6+ Years Role Summary We are seeking a Mainframe Developer to develop, enhance, and support mission-critical applications running on IBM z/OS. The role involves working on batch and online transaction processing, database interactions with DB2 or IMS, application testing, and ongoing production support. Key Responsibilities Design, develop, and maintain mainframe applications using COBOL (or PL/I), JCL, and related technologies. Develop and support batch processing jobs, including job streams, scheduling coordination, restarts, and abend handling. Build and maintain online applications using CICS and/or IMS TM, including transaction and screen/program changes. Develop and optimize data access using DB2 (SQL) and/or IMS DB, including basic performance tuning. Conduct impact analysis, effort estimation, and deliver enhancements or defect fixes through the SDLC. Perform debugging, root cause analysis, and resolution of production issues; participate in support rotations if required. Provide technical support for mainframe upgrades and enhancements. Document program specifications, job flows, runbooks, and release notes. Collaborate with business teams, QA, operations, and infrastructure to ensure stable releases and successful deployments. Follow secure coding practices and compliance standards related to data handling and system access. Required Skills Hands-on experience with IBM z/OS mainframe development. Strong proficiency in COBOL (or PL/I). Strong knowledge of JCL and batch job processing concepts. Working experience with DB2 (SQL development) and/or IMS databases. Experience using ISPF / TSO for navigating datasets, job logs, and outputs. Strong debugging and troubleshooting skills, including abend analysis. Good understanding of SDLC practices, testing, and release management processes. Strong communication and technical documentation skills. Primary Skill COBOL Skill Level Required: Advanced (6-9 Years Experience) Please click on the link below for our company benefits DTI is an Equal Opportunity Employer. We do not discriminate based on race, color, religion, sex, gender identity, sexual orientation, national origin, ancestry, age, disability, marital status, veteran status, or any other protected characteristic under Illinois state or federal law. All qualified applicants are encouraged to apply, and employment decisions are based solely on merit, qualifications, and business needs.

Created: 2026-03-13