Seasoned Mainframe Developer with 8 Years Experience
Resume:
Full Name: Dileep Kumar Koppisetti
Mainframe Developer.
***************@*****.***
EDUCATIONAL DETAILS:
Bachelors in Computer Science from PVP Siddhartha Institute of Technology. 2016.
Masters in Information Technology and Management from Indiana Wesleyan University. 2024.
PROFESSIONAL WORK SUMMARY.
Seasoned Mainframe Developer/Engineer with around 8 years of extensive experience in designing, developing, and maintaining complex mainframe-based applications across diverse industries.
Proficient in programming languages including COBOL and PL/I, with deep expertise in JCL for job automation and execution in high-volume data processing environments.
Extensive hands-on experience with DB2, implementing efficient database design, query optimization, and robust data management strategies.
Skilled in ENDEVOR and CHANGEMAN for configuration management, ensuring version control, seamless application deployment, and strict adherence to development standards.
Worked extensively on COBOL, DB2, JCL, VSAM, Net Express and Good hands on Easytrieve, Rexx, and CICS.
Good knowledge on Waterfall model, RUP Rational Unified process agile methodology.
Strong experience on coordination skills to lead onsite-offshore teams throughout all phases.
Worked on entire Software Development Cycle right from Requirement Gathering, Converting Business requirements into technical specifications, Impact Analysis, Root cause Analysis for problems or incidents, Estimation, Design High Level and Detail, Coding, Maintenance, and production support, Unit testing and Integration Testing.
Extensive experience in developing and maintaining core banking systems, ensuring high availability, accuracy, and security for critical financial transactions.
Played a pivotal role in designing and implementing credit processing systems, enhancing loan disbursement efficiency and compliance with financial regulations.
Delivered optimized insurance policy management systems, enabling seamless handling of policy issuance, claims processing, and renewals within strict SLAs.
Proficient in integrating mainframe systems with modern digital banking platforms, supporting real-time transaction processing and improving customer experience.
Proven ability to lead and collaborate with cross-functional teams, leveraging technical skills to drive innovation and deliver robust mainframe solutions.
Strong focus on process improvement, automation, and modernization of legacy systems, ensuring alignment with evolving business and technological needs.
Demonstrated expertise in designing, coding, and implementing mainframe applications to handle high-volume, mission-critical business processes, ensuring reliability and scalability across enterprise environments.
Deep understanding of batch processing systems, leveraging JCL to streamline job execution, optimize scheduling, and improve performance in data-heavy operations.
Proficient in developing and enhancing business logic using COBOL and PL/I, with a proven track record of delivering optimized and maintainable code.
Skilled in CICS for developing dynamic and responsive online applications, enabling seamless integration of transaction processing systems.
Participated in UAT and production validation for system enhancements to billing engines, clearing modules, and settlement reconciliation tools.
Extensive experience with DB2, focusing on database design, query tuning, data migration, and performance optimization to support business-critical systems.
Expertise in ENDEVOR and CHANGEMAN for maintaining version control and deployment automation, reducing development cycle times and ensuring consistency across environments.
Adept at leveraging OLTP (Online Transaction Processing) frameworks, including Netron, to deliver high-speed, reliable transaction systems tailored to business needs.
Proven capability in analyzing and resolving complex system issues, debugging programs, and implementing fail-safe solutions for critical mainframe applications.
Strong focus on system optimization and modernization, introducing innovative methods to extend the lifecycle of legacy systems while aligning with modern IT standards.
Significant experience in system conversions and migrations, ensuring seamless transitions with minimal downtime and data integrity throughout.
Proficient in building automation tools for repetitive mainframe tasks, improving productivity and reducing operational overhead.
Skilled in collaborating with cross-functional stakeholders to translate business requirements into robust technical solutions, driving project success within tight deadlines.
Proven ability to mentor junior developers, fostering a culture of technical excellence and continuous learning within teams.
TECHNICAL SKILLS AND AREA OF EXPERTISE:
Languages: COBOL, SQL, Easytrieve, JCL, PL/I, DCL, Visual Basic, C++, FOCUS, PACBASE, Rexx
Database Software: DB2, IMS, CICS, Oracle, Access, Sybase
Database Facility: SPUFI, QMF, FILEDB2
Release Management: Endevor, Changeman, Source Control System (SCS)
Job Scheduling: CA-7, CA-11, XQM, RACF, CA-View, SDSF, JOBTRAC, JHS
Utilities: IBGENER, IDCAMS, IBM Utilities, SyncSort, DFSORT, FileAid, WinZip, ZipFile, Panvalet, VIDD
Middleware: MQ Series
Fault Management: Abend-Aid, Fault Analyzer
Testing: Xpediter, Intertest, COBOL Workbench
Project Management: Application Life Cycle Management, Managenow, JIRA
Debugging and Development Tools: Beyond Compare, Net Express
Mainframes: IBM Z/OS, VAX/VMS, Windows 9x/2000/XP, MVS
Development Methodologies: SDLC, Agile, SCRUM
Email Software: Outlook, Lotus Notes
Spreadsheet Software: Crystal Reports, Excel, MS Access
Word Processing Software: Word, WordPerfect
Telecommunications: Skype, WebEx
Storage Access: VSAM
Products: Vantage, Wealth Management Accelerator (wmA), Product Wizard, Allowable Value Management (AVM)
Transfer Protocols: FTP, ELIPXMIT
Editor: TSO ISPF
Process Improvement: Six Sigma, LEAN
PROFESSIONAL SUMMARY
First Republic Bank (Oct 2024 - Till Now)
Los Angeles, CA
Role: Mainframe Developer
Responsibilities: -
Developed and maintained mainframe applications using COBOL, PL/I, and JCL to ensure accurate processing of financial transactions, account reconciliations, and regulatory compliance.
Performed database design, management, and optimization tasks using DB2, ensuring high availability, data integrity, and performance for mission-critical financial applications.
Integrated IMS with DB2 for hybrid data access using DL/I and SQL within COBOL programs.
Designed and implemented CICS-based online transaction processing systems, enhancing the efficiency and reliability of customer-facing and back-office financial operations.
Analyzed and monitored LPAR performance metrics to support application efficiency and system tuning.
Managed and automated software version control processes using ENDEVOR and CHANGEMAN to ensure consistent deployment across development, testing, and production environments.
Developed and maintained CICS COBOL programs for high-volume online transaction processing (OLTP) systems.
Worked with IMS Connect for TCP/IP integration with distributed systems.
Worked within z/OS environments using LPAR configurations to optimize resource allocation across multiple mainframe workloads.
Implement API-based integrations with distributed platforms to modernize legacy systems.
Executed batch job scheduling and monitoring using JCL, ensuring seamless processing of daily, weekly, and monthly financial reporting cycles.
Collaborated with cross-functional teams and business analysts to gather and analyze requirements, translating them into effective mainframe solutions for core banking, credit, and trading systems.
Conduct UAT and provide post-production deployment support ensuring zero downtime.
Collaborated with system programmers to troubleshoot and resolve LPAR resource contention issues
Migrated legacy CICS applications to modern architectures, ensuring backward compatibility.
Ensured data integrity and transaction control in IMS via checkpoint and restart logic
Proficient in developing and maintaining applications using IMS DB/DC (Database/Data Communications).
Supported development and deployment in isolated LPARs, ensuring minimal impact to production systems
Integrated legacy systems with modern platforms through APIs and middleware, ensuring smooth interoperability and data exchange across financial systems.
Participate in Agile ceremonies contributing to sprint planning and retrospectives.
Developed and tested disaster recovery plans for mainframe environments, minimizing downtime and ensuring business continuity in financial operations.
Partnered with infrastructure teams to forecast MIPS requirements for future system growth and scalability.
Ensured secure transaction processing by implementing CICS resource security via RACF.
Participated in capacity planning and performance analysis based on LPAR utilization and workload distribution
Developed IMS DC transaction programs using COBOL, PL/I, and Assembly language.
Conducted database performance tuning and reorganization using tools like IBM Utilities and File-Aid.
Collaborated with DBAs for IMS database performance tuning and capacity planning.
Implemented performance tuning and optimization strategies for COBOL programs, DB2 queries, and batch processes, resulting in reduced processing times and cost savings.
Analyzed application performance and CPU usage to reduce MIPS consumption and optimize cost-efficiency.
Implemented CICS web services (SOAP/REST) for integration with distributed systems and APIs.
Ensured compliance with financial regulations and standards by developing audit trails, access controls, and secure mainframe processing mechanisms.
Debugged and resolved issues using CEDF, Abend-AID, and InterTest for CICS transactions.
Developed and deployed MPP (Message Processing Programs) and BMP (Batch Message Processing) applications.
Acted as the primary liaison between onsite and offshore teams, facilitating seamless communication and ensuring alignment on project deliverables, timelines, and technical requirements for mainframe-based financial systems.
Monitored project progress and provided hands-on technical guidance, including debugging, code reviews, and ensuring compliance with mainframe standards, while addressing critical production issues and change requests efficiently.
Played a key role in end-to-end acquiring transaction lifecycle processing, including authorization, clearing, settlement, funding, and dispute management.
Monitored and resolved chargeback and dispute cases, ensuring compliance with card network guidelines and submitting compelling evidence within SLA windows.
Developed and optimized COBOL and JCL programs to minimize MIPS usage while maintaining performance standards
Experienced in PSB (Program Specification Block) and DBD (Database Definition) configurations.
Familiar with IMS Connect and integration of IMS with Web services for modern application access
Provided production support and incident resolution, identifying and resolving issues in financial applications to maintain service-level agreements and minimize disruption.
Supported cost-management initiatives by identifying high-MIPS-consuming batch jobs and recommending tuning strategies
Integrated IMS applications with DB2, CICS, and MQ for cross-platform data communication.
Conducted root cause analysis and system debugging to address errors in mainframe programs, leveraging debugging tools and techniques to deliver reliable financial solutions.
Designed and implemented IMS message formats (MOD, MFS, MID/MOD) for DC applications.
Supported mainframe modernization initiatives, migrating legacy applications to cloud-ready architectures while retaining financial system integrity.
Used SMF/RMF data to generate MIPS usage reports and provided recommendations for workload balancing.
Mentored junior developers on best practices in COBOL, PL/I, JCL, DB2, and CICS programming within the financial domain, fostering skill development and knowledge sharing.
Environment: COBOL, JCL, VSAM, DB2, TSO, ISPF and IBM Mainframe Rational tools, Endevor, IBM Utilities with Waterfall Methodology
Infosys (Oct 2019 – Apr 2023)
Hyderabad – India.
Role: Senior Mainframe Developer
Responsibilities: -
Worked through all the project life cycle SDLC Software Development Life Cycle which is a Water fall methodology starting from high level design to system/integration testing.
Prepared High level and Low Technical Design Doc as per Business design doc provided by Business system analyst.
Review the tech specs and participate in the tech spec meeting.
Designed, developed, and maintained mainframe applications on IBM z/OS using COBOL, DB2, VSAM, and CICS to support business-critical insurance and banking systems.
Automated batch cycles using CA-7, reducing manual effort by 30%.
Used various IBM utilities like DFSORT, IEBGENER, and IDCAMS to write various jobs depending on requirements.
Conducted detailed analysis of life insurance and annuities business processes to design scalable and efficient mainframe solutions. Developed High-Level and Low-Level Design Documents (HLD/LLD) aligning with policy administration systems like Vantage-One.
Designed, developed, and enhanced COBOL programs integrated with DB2 databases for managing policy administration, claims, annuities, and endorsements. Delivered optimized solutions for high-volume transaction processing.
Developed and maintained JCLs, PROCs, and PARMs for batch job execution and automated processes. Debugged and optimized online CICS transactions, ensuring seamless user experiences for critical business functions.
Collaborated with billing and finance teams to generate monthly/weekly invoices and merchant statements, including adjustments for chargebacks and promotions.
Performed advanced SQL scripting and database tuning in DB2 using SPUFI and QMF for efficient data retrieval and reporting. Conducted impact analysis to ensure database changes were implemented with minimal disruption.
Created comprehensive test plans, executed unit and system integration testing, and ensured defect-free implementation. Debugged batch and online programs using XPEDITOR and resolved issues promptly to meet delivery deadlines.
Participated in z/OS system-level debugging, including abend resolution (S0C7, S0C4, ASRA, AEY9), storage violations, and dump analysis.
Collaborated with Agile teams to enhance business functionality while maintaining system stability.
Supported UAT and production deployments, ensuring data accuracy across systems.
Introduced performance tuning techniques for COBOL-DB2 programs and batch processes, reducing runtime and improving system efficiency.
Automated recurring manual tasks, increasing operational efficiency.
Maintenance of JCLs, PROCs, PARMs and Loads for application.
Write complex queries using SPUFI to perform various operations on database.
Create unit test plan and execute Unit Testing.
Provide root cause analysis of defect and resolution of it in System testing phase.
Used XPEDITOR to debug both online and batch programs.
Worked towards providing value add to customers in addition to Client satisfaction.
Live movement of project into production with version control tool Endevor.
Providing Fix in case of abends or defects.
Post production warranty support.
Environment: COBOL, JCL, DB2, TSO, ISPF, COBOL, Xpeditor, Endevor, Fileaid-DB2, File-aid, IBM Utilities with Waterfall Methodology
Xact Data Discovery (July 2016 – Oct 2019)
Hyderabad, India.
Role: Mainframe Developer.
Responsibilities:
Conducted mainframe courses for three CCA / GPSC Mainframe Application Operations new hires.
Topics included JCL, TSO/ISPF, CA-7, Endeavor, DB2/SPUFI, VSAM, and SDSF, CA-VIEW.
Automated Global Product Description System Part Loading process; created five Job Control Language (JCL) jobs and five batch programs to replace manual dataset creation.
Updated existing JCL with parameter cards to end "on the y" changes and added automated CA-7 scheduling of jobs.
End results: eliminated two to four hours of manual effort, reduced process time by 95% and eliminated 99% of errors.
Automated Global Warranty Management month end reporting process; Developed six JCL jobs and added automated scheduling; End results: eliminated 99% manual effort.
Assigned Development Lead to oversee a five member team responsible for Enterprise PL/I upgrades of 22 applications. Individually completed 15 program conversions.
Delivered mainframe modernization by exposing COBOL business logic as REST APIs using z/OS Connect and supported integration with .NET/C# systems
Fulled Minor Enhancement Requests (MERS) and resolved production incidents for Dealer Material Returns (COBOL) and Engineering Technology Services (PACBASE) applications.
Served as Mainframe SME on Global Deployment & Stock Replenishment project.
Provided system analysis documentation, conducted courses, served as a liaison between Business Analysts, customers, Mainframe Architecture group and project team.
Served as Gap Tools project Mainframe SME; modified, tested and deployed over 10 JCL job and CA7schedules to upgrade from TECTIA to Secure FTP technology.
Worked on the Canadian Payroll Transition project updating COBOL batch programs and JCL jobs to properly interact with ADP.
Reviewed and revamped COBOL coding standards for CCA Mainframe group.
Environment: IBM TSO/ISPF, COBOL, JCL, DB2/SQL, IMS, Easytrieve, PACBASE, PL/1, SYNCSORT, IBGENER, Endeavor, FileAid, Intertest, CA-7, Microsoft Oce Suite Applications, HP Application Life-cycle Management, HP Service Manager, SharePoint, enABLE and Agile Application Development Life Cycle, .NET, C#, XML, WebEx, ELIPXMIT, Connect Direct
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