Surendra Sai

About Surendra Sai

Senior COBOL Mainframe Programmer with 10+ years of experience designing, developing, and maintaining enterprise-scalemainframe applications using COBOL, CICS, ADABAS, VSAM, and IBM JCL in high-volume production environments.• Extensive hands-on expertise with ADABAS (Adaptable Database System) including schema design, Natural/COBOL integration,database access optimization, and high-performance data processing.• Strong experience in developing online and batch applications using COBOL and CICS, supporting mission-critical enterprisesystems handling millions of transactions daily.• Proven ability to design and write complex COBOL programs that integrate with ADABAS databases and VSAM datasets for secureand efficient data processing.• Highly experienced in IBM JCL development and job scheduling, supporting large batch processing environments and optimizingnightly batch cycles.• Skilled in CICS transaction processing systems, building and maintaining high-performance online applications with reliable errorhandling and recovery mechanisms.• Strong background in ADABAS database architecture, file structures, and data access techniques, ensuring optimized queryperformance and database efficiency.• Experienced in analysing customer business requirements and translating them into technical specifications, delivering scalableand maintainable mainframe solutions.• Proficient in technical specification development, system documentation, and program design, ensuring alignment withenterprise architecture standards.• Demonstrated expertise in debugging, analysing, and resolving complex application defects across COBOL, CICS, ADABAS, andVSAM environments.• Extensive experience supporting enterprise batch processing systems, including troubleshooting failures during nightly batch runsand job scheduling cycles.• Strong understanding of mainframe batch and online processing architectures, ensuring application reliability and high systemavailability.• Experienced in unit testing, system testing, and integration testing for COBOL and mainframe applications to ensure high-qualitydeliverables.• Knowledgeable in ITIL-based operational support practices, ensuring effective incident management, change management, andproduction support processes.• Deep understanding of Software Development Life Cycle (SDLC) and CMMI best practices for enterprise application developmentand maintenance.• Skilled in performance monitoring and tuning of COBOL applications and ADABAS database operations, improving systemefficiency and response times.

Experience

1. Senior Mainframe Developer

   JPMorganChase

   Feb 2024 — Present · Des Moines, IA, US

   Designed and enhanced high-volume COBOL-DB2 batch and CICS online applications supporting credit card authorization andsettlement systems processing over 8–10 million transactions per day, improving throughput by 30% while maintaining strictfinancial SLA requirements.• Performed advanced DB2 SQL tuning including index redesign, access path optimization, RUNSTATS, and REORG utilities, reducingCPU utilization by 32% and shortening end-of-day batch processing windows by 25%.• Re-engineered complex JCL job streams using CA-7 scheduling and dependency mapping, eliminating 20% batch overruns andimproving overall SLA compliance to 99.8% across critical banking systems.• Provided L3 production support by resolving ABEND S0C7, S0C4, SQLCODE -904/-911 issues through dump analysis using Xpeditorand Abend-Aid, reducing recurring production incidents by 40%.• Developed high-performance CICS transaction modules for real-time account validation and fraud detection systems, decreasingtransaction response time by 22% during peak financial processing periods.• Led modernization initiative exposing 45+ COBOL services via z/OS Connect REST APIs, enabling secure integration with distributedJava microservices and reducing legacy interface latency by 18%.• Conducted impact analysis for SOX and PCI-DSS regulatory enhancements, implementing security controls that ensured 100% audittraceability across financial reporting systems.• Automated reconciliation and financial audit reporting using REXX and Easytrieve, reducing manual validation effort by 35% andimproving reporting accuracy by 20%.• Enhanced VSAM file structures and implemented IDCAMS dataset reorganization improving data recovery readiness by 25% andreducing file corruption issues.• Optimized MQ-based messaging interfaces reducing inter-system communication failures by 23% and improving transactionreliability.• Reduced batch failures by 27% through improved restart/recovery logic and proactive JES monitoring.

Education

• Acharya Nagarjuna University

  Bachelor of Technology - BTech