Darwin Mendoza
Senior Mainframe Developer
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About
Senior Mainframe Developer with over 10 years of IT experience, including more than 6 years developing and supporting enterprise IBM Mainframe applications for large-scale utility clients. Experienced in COBOL, JCL, DB2, VSAM, z/OS, batch processing, production support, and enterprise EDI systems. Recognized as a Subject Matter Expert supporting mission-critical production environments, leading vendor transition initiatives, resolving complex production issues, and maintaining highly available business systems aligned with US business hours.
Experience
Senior Software Engineer at Accenture Philippines (2022-12 – 2024-04)
- Developed and maintained enterprise COBOL/JCL applications supporting daily EDI batch processing.
- Performed data validation, repair, debugging, and production issue resolution.
- Served as Subject Matter Expert for business-critical production incidents.
- Collaborated with stakeholders supporting supplier onboarding and banking system enhancements.
- Led vendor transition activities ensuring smooth migration and on-time delivery.
- Supported production operations aligned with US business hours.
Software Engineer at Accenture Philippines (2020-12 – 2022-12)
- Developed COBOL and DB2 applications supporting enterprise business processes.
- Supported batch processing and transaction management.
- Participated in debugging, testing, and production deployments to improve application reliability.
Associate Software Engineer at Accenture Philippines (2018-02 – 2020-12)
- Assisted in the development and maintenance of IBM Mainframe applications.
- Worked extensively with VSAM, TSO/ISPF, Endevor, and ChangeMan.
- Supported application maintenance and production activities.
IT Staff at Englishcast Inc. (2016-01 – 2018-01)
- Managed Windows and Ubuntu environments.
- Maintained IT hardware, software, and network infrastructure.
- Performed daily monitoring and preventive maintenance.
IT Staff at Educhannel Inc. (2013-04 – 2015-12)
- Maintained company hardware, software, and network systems.
- Administered Windows and Linux Ubuntu environments.
- Performed infrastructure monitoring and maintenance.
Education
Bachelor of Science in Information Technology – Don Honorio Ventura Technological State University
