Professional Resume Template for
Mainframe Developer
Julian D. Sterling
Charlotte, NC
(704) 555-0143
julian.sterling@email.com
linkedin.com/in/julian-sterling | github.com/juliansterling | juliansterling.dev
Professional Summary
Systems-oriented Mainframe Developer with 5 years of experience optimizing and maintaining enterprise-scale transaction processing systems in the financial services sector. Expertise in writing high-performance COBOL and JCL, managing DB2 databases, and configuring CICS online environments. Successfully reduced nightly batch execution times by 28% and modernized mainframe integration endpoints to connect with hybrid cloud REST APIs. Proficient with IBM Developer for z/OS, ChangeMan ZMF, Control-M, and TSO/ISPF.
Work Experience
Mainframe Developer — Apex Financial Technologies
Charlotte, NC | June 2023 – Present
- Optimized 12 core batch processing jobs written in COBOL and PL/I, reducing nightly runtimes by 34% (saving 2.5 hours of processing time daily).
- Designed and implemented 8 new RESTful API endpoints using IBM z/OS Connect Enterprise Edition to bridge legacy DB2 database transactions with modern AWS microservices.
- Resolved CICS transaction latency issues by refactoring database access logic, lowering transaction response times by 18% for 4.2 million daily users.
- Automated deployment workflows using IBM Dependency Based Build and Git, reducing code release cycle times from 14 days to 4 days.
Associate Mainframe Programmer — Sentinel Insurance Group
Columbia, SC | June 2021 – May 2023
- Maintained and upgraded 45 legacy JCL routines, reducing execution errors by 22% and eliminating automated job restarts.
- Collaborated on the migration of an IMS database to DB2, successfully mapping and moving 12 million customer records with zero downtime.
- Performed regression testing and debugging using Xpediter for 3 major financial system releases, identifying and fixing 85 production-critical bugs.
- Documented 30 core legacy applications, decreasing developer onboarding ramp-up times by 15%.
Education
Bachelor of Science in Computer Science
Clemson University · Clemson, SC · 2021
Skills
COBOL, JCL, PL/I, CICS, DB2, IMS DB/DC, IBM z/OS, TSO/ISPF, Control-M, ChangeMan ZMF, IBM Developer for z/OS (IDz), z/OS Connect EE, REST APIs, Git, VSAM, SQL
Projects
Mainframe API Modernization
Role: Lead Developer
Tools: z/OS Connect EE, COBOL, DB2, CICS, Git
Developed REST API layers around 15 core mainframe transactions, allowing cloud-native applications to query customer ledger databases in under 85ms.
Batch Run-Time Optimization
Role: Mainframe Programmer
Tools: COBOL, JCL, DB2, Control-M, IBM Application Performance Analyzer
Refactored legacy COBOL search logic and redesigned SQL indexes on 4 large tables, reducing batch execution windows by 4.5 hours and saving $65,000 in monthly CPU usage costs.
Certifications
- IBM Certified System Programmer - z/OS (2024)
- IBM Certified Application Developer - COBOL (2022)
Additional information
- Languages: English (Native)
- Volunteer Work: Mentored 12 computer science students in legacy systems maintenance during regional university hackathons (2023-present)
- Availability: 2 weeks notice
Job Market Insights
Market data and opportunities for
Mainframe Developer
Job Market Insights
$85,000
-
$140,000
Avg:
$110,000
Growth Outlook:
The demand for Mainframe Developers in the United States remains resilient, driven by legacy system modernization in the financial services, insurance, and government sectors. Rather than replacing mainframes completely, enterprises are prioritizing hybrid cloud environments, which requires developers who can connect traditional z/OS applications to cloud APIs. The job market is characterized by steady opportunities as a significant portion of the senior workforce reaches retirement age, creating a strong demand for skilled professionals who understand both legacy architectures and modern DevOps pipelines.
Steady demand driven by modernization & retirement cliff
Key Skills Required
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