Mainframe Developer contract jobs with Banking Domain in Westlake, TX

Tech Mirrors; Westlake (TX); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Tech Mirrors in Westlake, TX is seeking a Senior Mainframe Developer to design, build, and optimize enterprise COBOL batch and online programs in IBM z/OS environments. The role features a hybrid schedule with alternating onsite and remote weeks, and requires expertise in CICS, DB2, JCL, and modern API enablement.

You will lead performance tuning, debugging, and code reviews, partnering with architecture teams to ensure high availability and secure data processing for financial and healthcare

Qualifications

• 8+ years of professional experience in IBM Mainframe software engineering.
• Proven track record in high-volume, transactional environments e.g., Financial Services, Healthcare, Logistics, or Insurance.
• Domain expertise: Banking, Stock plan experience preferred.
• Skill set includes COBOL, JCL, Embedded SQL, and Assembler/EZTrieve.

Responsibilities

• Application Development and Engineering Design, write, test, and implement complex, highly secure batch and online programs utilizing enterprise COBOL within IBM zOS environments.
• Transaction Processing CICS Architect and optimize online CICS applications to ensure ultra-low latency, optimal screen data layouts, high-volume throughput, and robust error-handling protocols.
• Database Management DB2 Design efficient relational tables, write high-performance embedded SQL statements, and optimize DB2 store procedures, indexes, and queries to eliminate processing bottlenecks.
• Batch Architecture and JCL Manage, write, and optimize complex JCL Job Control Language streams, utilities IEBGENER, IDCAMS, SORT, and automated batch scheduling systems.
• Performance Tuning and Debugging Perform advanced root-cause analysis, system tracing, and performance tuning using tools like Dump Analysis, Xpediter, InterTest, or File-AID to maintain high availability.
• Systems Integration and API Enablement Partner with Cloud and Integration Architects to expose core mainframe data and transactional logic to modern RESTful APIs via zOS Connect or MQ Series.
• Technical Stewardship Define and enforce coding standards, lead rigorous code reviews, and maintain comprehensive documentation for legacy architectures.

Job description

Mainframe Developer

Location: Westlake, TX (This is a hybrid role monthly, 1 week onsite, and 1 week remote alternatively)

Responsibilities

• Application Development and Engineering Design, write, test, and implement complex, highly secure batch and online programs utilizing enterprise COBOL within IBM zOS environments.
• Transaction Processing CICS Architect and optimize online CICS applications to ensure ultra-low latency, optimal screen data layouts, high-volume throughput, and robust error-handling protocols.
• Database Management DB2 Design efficient relational tables, write high-performance embedded SQL statements, and optimize DB2 store procedures, indexes, and queries to eliminate processing bottlenecks.
• Batch Architecture and JCL Manage, write, and optimize complex JCL Job Control Language streams, utilities IEBGENER, IDCAMS, SORT, and automated batch scheduling systems.
• Performance Tuning and Debugging Perform advanced root-cause analysis, system tracing, and performance tuning using tools like Dump Analysis, Xpediter, InterTest, or File-AID to maintain high availability.
• Systems Integration and API Enablement Partner with Cloud and Integration Architects to expose core mainframe data and transactional logic to modern RESTful APIs via zOS Connect or MQ Series.
• Technical Stewardship Define and enforce coding standards, lead rigorous code reviews, and maintain comprehensive documentation for legacy architectures.

Qualifications

• 8+ years of professional experience in IBM Mainframe software engineering.
• Proven track record in high-volume, transactional environments e.g., Financial Services, Healthcare, Logistics, or Insurance.
• Domain expertise: Banking, Stock plan experience preferred.
• Skill Matrix: Domain required tooling and concepts such as languages Enterprise COBOL, JCL, Embedded SQL, Assembler/EZTrieve (plus).
• Online Processing: CICS BMS Maps, TS/TD Queues, Program Control, Intercommunication.
• Data Management: DB2 Relational design.