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Saikumar - Senior Mainframe Developer

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Location: Charlotte, North Carolina, USA

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PROFESSIONAL SUMMARY Senior Mainframe Developer with 10+ years of experience in IBM z/OS environments specializing in COBOL, DB2, JCL, and CICS development. Experienced in designing and supporting enterprise claims processing and financial transaction systems in healthcare and banking domains. Strong background in full SDLC including requirements analysis, design, development, testing, and production support for high-volume batch and online systems. Proven ability to resolve production issues, optimize batch performance, and collaborate effectively in team-based development environments. Extensive hands-on expertise in COBOL, DB2, VSAM, JCL, CICS, MQ, and Batch/Online processing within IBM z/OS enterprise environments. Strong experience in ACH payment processing including inbound/outbound transactions, NACHA validations, returns processing, and reconciliation workflows. Proficient in client settlement, interchange settlement, clearing/funding cycles, billing systems, and dispute management processes. Demonstrated expertise in handling large-scale batch processing environments with complex job dependencies using CA7 and JCL automation. Proven experience providing L2 production support in 24x7 environments, resolving critical abends, DB2 deadlocks, dataset issues, and MQ queue backlogs within SLA timelines. Hands-on experience with Broadcom tools including CA7 for job scheduling and Endevor for source code management and controlled production deployments. Strong understanding of core acquiring and payment processing lifecycle including authorization, clearing, settlement, reconciliation, and funding flows. Experienced in analyzing payment breaks, transaction mismatches, and settlement discrepancies with effective root cause resolution. Actively involved in full Software Development Life Cycle (SDLC) including requirements gathering, technical design, coding, unit testing, system testing, UAT support, deployment, and post-production maintenance. Skilled in performance tuning of DB2 queries, optimizing VSAM file access paths, and restructuring batch processes to improve runtime efficiency. Strong ability to collaborate with business analysts, QA teams, and stakeholders to translate business requirements into technical solutions. Experienced in conducting code reviews, impact analysis, and implementing regulatory or business-driven enhancements in banking systems. Excellent analytical, problem-solving, and communication skills with the ability to work effectively in onsite banking and high-pressure production environments. TECHNICAL SKILLS Mainframe Languages: COBOL, JCL, REXX, SQL, PL/SQL, Python Mainframe Technologies: CICS, VSAM, DB2, IMS (DLI Calls), IDMS, JES2, z/OS Unix Services (OMVS),SMS, DFSMS (ACS Routines, Storage Groups, Management Classes, Data Classes),DFHSM (Migration, Recall, Backup, Space Management),FDR (Backup, Restore, Volume-Level Recovery),MVSRM (Resource Monitoring & Resource Controls),IBM DS8000 (DS8K) Storage Administration, GDPS Concepts (Replication & Disaster Recovery Support),Storage Pool Administration, Volume Lifecycle Management, Catalog & Alias Management, Dataset Allocation & Volume Management ,IDCAMS, ICKDSF, IEHLIST, DFDSS,GRS, RMF, SMF, WLM, TSO/ISPF,Parallel Sysplex, MQ Series, Broadcom CA7, Endevo. Banking & Payment Systems: ACH Processing, Payment Settlement & Clearing Systems, Payment Reconciliation Systems, Client Settlement, Interchange Settlement, Clearing/Funding Cycles, Billing & Dispute Processing Operating Systems: Windows Server 2008/2003/NT/2000, Windows 7/XP, UNIX, WebLogic 10.3, Bluezone Terminal Emulator, VTAM Session Manager z/OS System Engineering: z/OS Installation, Configuration & Maintenance, Parallel Sysplex Architecture, XCF, CFRM, Coupling Facilities (CF), JES2 Administration, IPL, Rolling IPL, SMP/E, VTAM, TCP/IP, SNA Communication, Secure Mainframe Connectivity Data Modeling : ERWIN, Power Designer - CDM, LDM, PDM Security & Compliance: TSS/RACF, TLS, HIPAA, SOX, PCI-DSS, Encryption/Decryption, CA Top Secret (TSS), RACF, TLS/SSL Certificates, RSA Keys, SFTP, FTPS Databases:DB2, IMS, Oracle, MongoDB, SQL Server, SQL Profiler, SQL Query Analyzer, Management Studio, SQL Agents, SQL Alerts, SQL Jobs Testing & Version Control Tools: DOORS, Clear Case, SVN, JIRA, Documentum, VSS, Serena Dimensions, DataStage Version Control Utilities & Tools: MVS, z/OS, DFSORT, IEBGENER, DB2 Explain, IKJEFTO1, SMP/E, RMF, SMF, WLM, IBM Utilities (IDCAMS, IEBCOMPR, IEBCOPY), File-Aid, SPUFI, SMS, Catalogs, MVS Commands PROFESSIONAL EXPERIENCE Client: Prudential Financial, USA Feb 2024 Present Role: Senior Mainframe Developer Project Description: Worked on enterprise mainframe applications supporting high-volume financial transaction processing on IBM z/OS. Responsible for developing and enhancing COBOL batch and CICS online programs for claims and payment processing systems using DB2, VSAM, and JCL. Participated in full SDLC including requirements analysis, design, coding, testing, and implementation while ensuring high availability of mission-critical applications in a 24x7 production environment. Responsibilities: Analyzed business requirements and translated them into technical design specifications for enterprise mainframe applications supporting high-volume financial transactions. Developed and enhanced COBOL batch and online programs for payment and transaction processing systems on IBM z/OS. Designed and maintained COBOL-DB2 programs using embedded SQL for efficient data retrieval and transaction processing. Developed and modified JCL procedures to support batch job execution, scheduling, and automated data processing cycles. Created and maintained CICS online transactions for real-time processing and inquiry of transaction data. Performed impact analysis, code enhancements, and defect fixes based on business and regulatory requirements. Wrote complex DB2 SQL queries for data validation, reporting, and reconciliation processes. Monitored and supported enterprise batch processing environments using CA7 scheduling and automated workflows. Debugged application issues using Abend-Aid, Expeditor, and File-Aid, identifying root causes and implementing fixes. Resolved production incidents including batch abends, DB2 deadlocks, dataset issues, and job failures within SLA timelines. Collaborated with business analysts, QA teams, and stakeholders to implement application enhancements and system improvements. Participated in unit testing, system testing, and UAT activities to ensure application quality and stability. Maintained source code and supported application deployments using Endevor change management processes. Provided 24x7 production support for mission-critical payment processing systems in a high-availability environment. Supported integration of mainframe applications with DB2, VSAM, CICS, and MQ middleware for secure data exchange. Optimized batch job performance by improving JCL workflows, DB2 query performance, and file processing logic. Participated in code reviews, technical documentation, and change management processes following enterprise development standards. Ensured system reliability by monitoring job execution, resolving failures, and maintaining operational stability of critical financial systems. Environment: OS/390, COBOL, JCL, VSAM, CICS, PANVALET, SCS, TSO, FILE-AID, CA File Master Plus, CA7, CA InterTest, XPEDITOR, ServiceNow CLIENT: Bank Of America, USA. Aug 2019 Jan 2024 Role: Sr. Mainframe Developer Project Description: Supported enterprise-scale Core Banking, Payments, and Customer Account Management applications on IBM z/OS, providing development and production support for COBOL, DB2, CICS, MQ, JCL, and batch processing systems. Worked within z/VM environments to maintain system stability, ensure secure financial transaction processing, support regulatory compliance requirements, and resolve critical production incidents within SLA commitments. Responsibilities: Developed and maintained IMS DB/DC online transaction programs and batch COBOL applications supporting core banking operations, customer account management, and financial transaction processing. Utilized IMS DL/I calls for account inquiry, customer information updates, transaction processing, and financial record maintenance within banking systems. Supported banking applications handling customer onboarding, deposit accounts, loan servicing, payment processing, and account reconciliation. Worked with Telon-based screen maintenance and legacy banking application enhancements within IBM Mainframe environments. Collaborated with business analysts, QA teams, and offshore development teams to deliver banking application enhancements using Agile methodologies. Participated in technical design reviews, impact analysis, code walkthroughs, and production implementations for banking applications. Provided production support for high-volume online and batch banking systems while ensuring adherence to SLA and regulatory requirements. Prepared technical documentation including functional specifications, design documents, test plans, implementation procedures, and support guides. Worked independently to resolve production incidents and deliver multiple enhancements within project timelines. Migrated banking application components using Workbench, reducing deployment defects and improving testing efficiency. Designed and developed COBOL-DB2 programs supporting loan processing, account servicing, payment processing, and customer relationship management systems. Developed batch JCL workflows for end-of-day processing, account reconciliation, statement generation, interest calculations, and financial settlements. Implemented CICS transactions for account inquiry, customer profile maintenance, fund transfers, payment processing, and transaction tracking. Wrote complex SQL queries for financial reporting, transaction analysis, customer account reconciliation, and regulatory reporting requirements. Optimized daily, weekly, and monthly batch processing cycles by restructuring JCL and COBOL programs, reducing processing time for banking operations. Resolved high-priority production issues within SLA deadlines, minimizing disruptions to customer-facing and back-office banking applications. Partnered with business teams to enhance banking processes while ensuring compliance with financial regulations and internal security policies. Utilized Workbench tools to migrate application components from Development to QA and Production environments for validation and deployment. Environment: COBOL, JCL, DB2, VSAM, CICS, File-Aid, Control-M, Endeavor, SPUFI, Z/OSDB2, Eclipse, Java, Oracle, SQL, Abend-aid, Expediter, SPUFI, FILE-AID, TSO/ISPF, Control-M, Z/OS, and MVS. Client: Chubb Insurance, USA. June 2017 - July 2019 Role: Mainframe Application developer Project Description: Contributed to investment and financial reporting systems involving full lifecycle application development, testing, and production deployment on IBM mainframe platforms. The engagement included designing and enhancing COBOL-IDMS and COBOL-DB2 applications, supporting high-volume batch cycles, and integrating DB2, VSAM, and embedded SQL to strengthen data integrity and reporting accuracy. Worked on core payment acquiring and processing systems including transaction authorization, clearing, settlement, reconciliation, and funding flows. Responsibilities: Designed and developed COBOL-IDMS programs for investment claims processing, reducing data discrepancies by 18% through improved business logic and DB2 integration. Led unit and system testing activities using HP Quality Center, achieving complete test coverage for critical financial porting components. Resolved over 120 defects during the UAT phase, ensuring timely delivery of investment and healthcare reporting enhancements. Collaborated with onsite stakeholders to streamline peer code reviews, strengthening compliance with coding standards and regulatory guidelines. Developed and modified enterprise applications using COBOL, DB2, JCL, and VSAM, including coding, testing, and implementation activities. Managed code migration from non-production to production environments using the ENDEVOR change management tool. Coordinated production deployments through ENDEVOR to ensure controlled and compliant code promotion processes. Developed and enhanced Revenue Journals System modules (CRIS, BART, ARMS, LATIS, SSW, and BROAD BAND), utilizing COBOL for business logic, JCL for batch scheduling and execution, DB2 with embedded SQL for transactional data processing, and VSAM for high-volume file handling to ensure accurate journal postings. Debugged and resolved COBOL, DB2, and VSAM batch cycle issues using Expeditor, minimizing runtime failures and ensuring processing accuracy. Utilized QMF to query, update, and validate data in Test and QA databases, executing complex SQL statements for reporting validation. Prepared detailed effort estimations covering analysis, design, test case development, QA validation, and UAT activities to support project planning. Created comprehensive test plans and unit test cases based on functional requirements, business use cases, and system design documentation. Reviewed high-level and low-level design documents to validate alignment with business objectives and system functionality. Participated actively in quality assurance processes, executing test plans, tracking defects, and validating resolution outcomes to ensure successful deployment. Reviewed functional and technical specifications, analyzed enhancement requests, performed code reviews and functional testing, and delivered assigned tasks within established timelines. Supported financial settlement reporting systems handling high-volume investment and transaction postings. Assisted in reconciliation processes ensuring accurate settlement and billing generation. Provided production support for transaction discrepancies and batch cycle failures. Environment: COBOL, JCL, DB2, IDMS, ENDEVOR, File-AID, Control-M, JAVA, UNIX, Embedded SQL, CICS, DB2, ENDEAVOR, EXPEDITOR, QMF, VSAM, FILE-AID Client: Fujitsu, Chennai, India May 2013-December 2015 Role: Main Frame Developer Project Description: Supported pharmaceutical order processing and inventory management systems for Cipla using IBM mainframe technologies including COBOL, DB2, VSAM, and JCL. The project focused on enhancing medicine order tracking, maintaining accurate inventory levels, and ensuring regulatory compliance. The objective was to improve data processing efficiency, minimize downtime, ensure accurate reporting, and maintain secure access to sensitive pharmaceutical information in compliance with regulations such as HIPA Responsibilities: Developed COBOL-VSAM programs for pharmaceutical order processing, reducing inventory update latency by 30%. Validated HIPAA-compliant data handling processes using DB2 SPUFI to support regulatory audits and compliance checks. Automated JCL-driven batch schedules to enhance order fulfillment accuracy and processing efficiency. Designed and maintained COBOL applications on z/OS to manage pharmaceutical orders, validate order details, and update inventory levels accurately. Created and maintained DB2 tables for storing and retrieving order and inventory data, utilizing SPUFI for query validation and testing to ensure data integrity. Scheduled, monitored, and troubleshot batch operations to guarantee timely and accurate order processing and inventory reconciliation. Environment: z/OS, COBOL, JCL, DB2, SPUFI, VSAM Keywords: quality analyst message queue database zos hewlett packard procedural language California