Ishita Kaul

Results-driven Mainframe Developer with 5+ years of experience in designing, developing, and maintaining large-scale enterprise applications. Proficient in COBOL, JCL, VSAM, and DB2, with strong expertise in batch and online processing, data management, and system optimization. Adept at enhancing application performance, ensuring data integrity, and delivering robust, scalable solutions that improve overall user experience.

• Daily Batch Job Debugging & Production Defect Resolution
• Client: Nationwide Building Society, UK

Project overview:

Executed systematic debugging of a complex multi-program daily batch job to identify and remediate a critical COBOL defect impacting customer membership calculation accuracy.

Key Contributions:-

• Diagnosed root cause of membership calculation discrepancy in production environment.
• Developed and tested production fix with complete unit testing coverage.
• Coordinated ST/SIT (System Testing/System Integration Testing) validation.
• Optimized existing COBOL code by refactoring algorithms for improved efficiency.
• Troubleshot production issues related to data integrity and performance degradation.
• Implemented corrective measures to prevent recurrence.

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• Customer data migration to SAP
• Client: Nationwide Building Society, UK

Project overview:

Led a team of three developers in a critical customer data migration project from legacy mainframe systems to SAP, serving as the single point of contact for cross-functional teams, and ensuring a smooth transition.

Key Contributions:-

• Managed end-to-end data migration strategy, coordinating between legacy systems and SAP platform.
• Served as primary liaison for cross-functional stakeholder communication and issue resolution.
• Addressed technical concerns and ensured zero data loss during transition.
• Provided mentorship to junior developers throughout project lifecycle.
• Maintained comprehensive documentation of all changes made to source code and database structures.

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• High-Visibility Data Integrity Cleanup
• Client: Nationwide Building Society, UK

Project overview:

Worked on a high-visibility project to resolve data integrity issues across approximately 92 million records in the customer database. Developed complex COBOL + LINC programs to identify and delete problematic records, implementing a parameterized multi-chunk deletion approach for optimal performance.

Key Contributions:-

• Scope: Created new COBOL program to systematically identify and remove customers causing data integrity issue.
• Impact: Resolved data integrity issues across 92 million records with zero escalations.
• Technical Execution: Developed parameterized multi-chunk deletion algorithms for efficient processing.
• Deployment: Achieved flawless production go-live with comprehensive unit testing and coordination.
• Documentation: Created detailed technical specifications with high-level design and pseudo-code.
• Compliance: Enhanced data accuracy and ensured regulatory compliance.

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• Flex Account (Travel Insurance) Closure
• Client: Nationwide Building Society, UK

Project overview:

Worked on a comprehensive travel insurance closure process serving the client’s customers, involving several interrelated projects. Collaborated closely with two junior developers, providing technical guidance and support throughout the development lifecycle while leveraging COBOL, batch jobs, and LINC technologies.

Key Contributions:-

• Designed, developed, and maintained COBOL programs, batch jobs, and LINC components integral to the workflow.
• Supported and mentored junior developers to enhance code quality and timely delivery.
• Coordinated multiple projects to ensure seamless integration and consistent functionality across modules.
• Ensured robust batch processing and data accuracy critical for insurance policy management.