Senior Mainframe Developer with 7+ years of performance-driven

Rumana Shaik

+1-940-***-**** *****.*@**********.*** Linkedin

Professional Summary

Mainframe Developer with over 7 years of experience developing and modernizing enterprise applications across Banking, Financial Services, and Healthcare environments. Built and enhanced z/OS, COBOL, and CICS applications supporting millions of daily transactions, optimizing DB2 SQL and DL/I access paths to improve transaction response time by 30% and increase system throughput for high-volume OLTP workloads.

Integrated legacy mainframe systems with modern platforms using REST APIs and IBM MQ, enabling secure real-time communication between distributed applications and core mainframe services. Delivered 20+ backend service integrations that reduced manual data exchange processes by 40% and improved cross-platform data availability.

Implemented CI/CD pipelines using Jenkins, Git, and IBM Dependency Based Build (DBB) to automate build and deployment workflows for mainframe applications. Reduced release cycle time by 35%, improved deployment consistency, and helped teams deliver faster and more reliable production releases.

Strengthened enterprise security and operational reliability using RACF access management and compliance controls aligned with SOX / HIPAA standards. Supported production environments processing thousands of batch jobs daily, performing performance monitoring and root cause analysis that reduced recurring production incidents by 25% and improved system stability. Skills

Languages / Mainframe Tools : COBOL, CICS, Enterprise COBOL, RPG-style Structured Logic, JCL, SQL, DB2 SQL, REXX, Easytrieve, Python, Shell Scripting, PL/I, IBM Assembler (HLASM), IBM z/OS, IBM iSeries (AS/400) Fundamentals, TSO/ISPF, ROSCOE, File-AID, Xpediter, SDSF, Endevor, Changeman, Panvalet, CA7, ZEKE, JES2, SPOOL, IDCAMS, IEBGENER, IEBCOPY, SORT, OPC Tivoli, Zowe CLI, IBM DBB, ARCAD CI/CD Workflows, SMP/E Maintenance Awareness, Parameter Passing (CALL/CALLR). Enterprise File Transfer: IBM Connect:Direct (NDM), SFTP, FTPS, AS2 Protocol, FTP, PGP Encryption/Decryption, GDG-based File Transfers, Dataset Transmission (PS/PDS), Cross-LPAR File Movement, Automated File Scheduling via CA7, Batch File Reconciliation, Managed File Transfer (MFT) Database: DB2 for z/OS, DB2/400, SQL Server, ADABAS, IMS DB, DL/I, VSAM KSDS/ESDS/RRDS, Stored Procedures, Triggers, Views, QMF, SPUFI, BMC Utilities, Load/Unload Utilities, Large Dataset Processing, Performance Tuning, Access Path Optimization, ETL-style Data Transformation Middleware / Integration: CICS, BMS Maps, COMMAREA, TSQ/TDQ, IBM MQ, WebSphere MQ, z/OS Connect EE, REST APIs, JSON, XML, SOAP, Backend- to-Web Integration, Service Orchestration, API Modernization, Event-driven Messaging, Microservices Integration DevOps & Engineering Tools: Jenkins, Git, Bitbucket, UrbanCode Deploy, Ansible, CI/CD Pipelines, Automated Deployments, Version Control, Change Control, Code Reviews, Automated Test Harnesses, DevOps Automation, Pipeline Orchestration, Build Automation Batch Processing & Scheduling: JCL Workflow Optimization, Job Dependency Automation, Restart/Recovery Logic, SOC4 / S0C7 Abend Analysis, Dataset Validation, I/O Bottleneck Analysis, Batch Window Optimization, Parallel Batch Processing, GDG Lifecycle Management Monitoring & Debugging: Abend-AID, IBM Debugger, SYSVIEW, SMF Logs, SYSLOG, Omegamon, RMF, Log Analyzer, Performance Monitoring, Root Cause Analysis, Dump Analysis, CICS Trace Analysis

Reporting & Analytics: Power BI, Tableau, Excel, Splunk, SAS, Control-D, Crystal Reports, Audit & Compliance Reporting, Operational Metrics Reporting Methodologies, Security & Domain Expertise: Agile, Scrum, SAFe, SDLC, ITIL, DevSecOps, RCA, Refactoring, Unit Testing, Integration Testing, Iterative Delivery, Production Support, Incident Management, Change Management, Release Management, RACF Access Controls, Secure File Exchange, Dataset Security, Encryption Standards, SOX Compliance, HIPAA Data Handling, Access Auditing, Healthcare Systems, Banking, Financial Services, Payment Systems, Insurance, High-Volume Transaction Processing, Compliance & Audit Readiness, Enterprise Transaction Processing. Work Experience

Morgan Stanley, Dallas, Texas Nov 2024 - Present

Mainframe Engineer

Designed and implemented modular backend logic using COBOL/DB2 aligned with RPG-style structured programming, improving maintainability and preparing legacy components for modernization.

Developed and optimized DB2 SQL queries, stored procedures, and large-dataset processing pipelines, mirroring DB2/400 and SQL Server workloads on IBM iSeries.

Resolved 300+ production incidents across enterprise mainframe applications, improving operational stability and reducing application downtime by 45%.

Integrated backend logic with distributed systems using REST/JSON services, MQ messaging, and z/OS Connect, enabling web applications to consume mainframe data.

Optimized CICS transaction performance by identifying inefficient DB2 cursor usage patterns, improving average transaction response time from ~2.8s to 1.9s.

Investigated and resolved CICS abends (AEI9, ASRA, etc.) using dump analysis and SMF trace logs, improving production stability across high-volume financial modules.

Worked in an enterprise environment that included IBM iSeries (AS/400) systems, collaborating with teams that maintained RPG/RPGLE-based business logic, which strengthened my understanding of cross-platform integration between distributed applications and mainframe backend services.

Improved batch performance by redesigning JCL, eliminating redundant steps, and implementing parallel processing, reducing runtime by 28%.

Strengthened platform security by restructuring RACF access controls, aligning with iSeries-style authorization and audit requirements.

Led unit testing and integration testing efforts across QA/UAT environments, building reusable test harnesses and validating end-to-end workflows.

Engineered CA7 job dependency automation and restart logic for mission-critical nightly batch cycles, reducing manual intervention during job failures by ~40%.

Re-sequenced multi-step JCL workflows to eliminate I/O bottlenecks across VSAM and DB2 datasets, shortening end-of-day processing windows by ~1.5 hours.

Collaborated with DevOps teams to implement CI/CD pipelines using Jenkins, Endevor, and automated promotion workflows, improving deployment frequency by 25%.

Supported ADABAS-backed financial data environments by analyzing Natural/ADABAS data structures and integrating extracted datasets into DB2 reporting pipelines, improving cross-platform reconciliation accuracy by ~22%.

Participated in Agile ceremonies (Daily Standups, Sprint Planning, Retrospectives) and contributed to SAFe Release Train deliverables.

Configured GDG-based file versioning and restartable SFTP transfers for mission-critical settlement files, reducing manual intervention during transfer failures by ~40%.

Conducted code reviews, enforced best practices, and mentored junior developers on clean coding, debugging, and change control processes.

Developed and enhanced Assembler-based utility routines to handle file I/O and memory-efficient data manipulation within COBOL batch jobs, reducing CPU utilization during peak-volume nightly processing by ~15%.

Executed disaster recovery simulations and failover testing, ensuring system resilience and compliance with BCP and regulatory standards. Capgemini, Hyderabad, India Feb 2021–Jul2023

Mainframe Developer

Developed enterprise-grade COBOL/DB2 backend modules supporting high-volume financial transactions, directly transferable to RPGLE modular development on IBM iSeries.

Executed structured data conversion and transformation processes, improving onboarding accuracy by 90%, demonstrating strong large-dataset processing capabilities.

Built and optimized DB2 SQL queries, stored procedures, and triggers, improving reporting performance and aligning with SQL Server/DB2/400 expectations.

Integrated backend logic with distributed systems using MQ messaging, JSON/XML, and service-based workflows.

Troubleshot and resolved 200+ production issues using Abend-Aid, IBM Debugger, SYSLOG, and SMF logs, reducing recurring incidents and improving system stability.

Implemented unit testing and regression testing frameworks using JCL-based test harnesses, improving defect detection and reducing UAT issues by 30%.

Implemented IBM Connect:Direct (NDM) workflows to securely transfer high-volume financial datasets across distributed platforms, improving inter-system data availability by ~30%.

Designed IMS hierarchical database access logic using DL/I calls within COBOL programs to support high-throughput transaction processing in OLTP environments.

Tuned IMS database access paths by restructuring segment search logic, reducing sequential scan overhead and improving IMS transaction response times by ~18%.

Participated in IMS DB recovery simulations (image copy + log replay) to validate disaster recovery readiness and minimize recovery point objectives (RPO) for business-critical datasets.

Managed job scheduling, dependency handling, and recovery using CA7, ensuring 100% SLA adherence for critical batch operations.

Collaborated with DevOps teams to streamline CI/CD workflows, automate Endevor promotions, and enforce version control and change management standards.

Performed root cause analysis on recurring SOC4 and S0C7 abends across financial reporting modules, introducing dataset validation routines to prevent downstream job cascades.

Participated in Agile/Scrum ceremonies, contributed to sprint deliverables, and supported iterative development cycles.

Created compliance and audit reports using DB2, Excel, and Control-D, supporting regulatory and operational reporting needs. Hexaware Technologies, Hyderabad, India Aug2018–Jan2021 Mainframe Developer

Reduced batch job failures by 25% by thoroughly analyzing historical abend logs across claim and billing modules, implementing reusable COBOL-JCL fixes, and coordinating with QA to validate nightly batch runs.

Refined data retrieval processes by rewriting inefficient nested DB2 queries and restructuring complex VSAM datasets, which improved downstream reporting turnaround time by 18% and supported real-time audit readiness.

Boosted SLA adherence from 91% to 98% by coordinating closely with cross-functional L2/L3 support teams, automating critical job restarts in CA7, and documenting fallback procedures for high-priority financial transactions.

Automated application build and deployment workflows using Jenkins + IBM Dependency Based Build (DBB), reducing manual promotion effort by ~35%.

Integrated Endevor change packages into Git-driven CI/CD pipelines via Zowe CLI, improving traceability and rollback capabilities during multi-environment deployments.

Implemented automated JCL-based regression pipelines triggered through Jenkins, reducing post-release batch defects by ~27%.

Enabled early defect detection and reduction by developing robust JCL-based test harnesses, creating realistic staging datasets, and automating regression testing across three major insurance client environments, reducing UAT issues by 30%.

Accelerated code deployment cycles by 40% by streamlining Endevor promotion workflows, improving audit traceability, and implementing a standardized version control checklist across development and QA teams handling cross-region releases.

Managed the migration of legacy batch jobs to a modernized z/OS JES2 environment, ensuring backward compatibility, minimizing disruption, and reducing nightly processing time by 20% across multiple business-critical systems. Volunteer Experience

Open Mainframe Project - Mainframe Modernization May 2025 – Aug 2025

Contributed to Open Mainframe Project modernization initiatives, collaborating with global engineers on COBOL refactoring, API enablement, and hybrid cloud integration patterns to help bridge legacy z/OS systems with modern enterprise architectures.

Promoted adoption of open-source mainframe tooling including Zowe CLI, Git-based workflows, and CI/CD practices, supporting modernization strategies that improve development efficiency and accelerate enterprise mainframe transformation. Eli Madison Memorial Apprenticeship (EMMA) - Enterprise Mainframe Apprentice Aug 2025 – Dec 2025

Selected for the Eli Madison Memorial Apprenticeship (EMMA), participating in hands-on projects focused on automated application discovery, dependency mapping, and legacy system assessment to support large-scale mainframe modernization efforts.

Developed modernization concepts leveraging AI-assisted COBOL analysis, modular code transformation, and hybrid cloud migration strategies, collaborating with mentors and industry architects to align z/OS workloads with cloud-native and DevOps practices. Education

Master of Science in Information Systems & Technology University of North Texas, Denton, Texas GPA: 4/4

Bachelor of Technology in Electronics and Communications Vignan’s Lara Institute of Technology & Science, Vadlamudi, Andhra Pradesh GPA: 8.71/10 Certifications

Agile Software Development

AWS Cloud Practitioner Essentials

AWS Fundamentals-migrating to cloud

IBM Z DevOps Fundamentals

IBM Z Explore - Concepts

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