One Tip That Accelerated My Growth in Mainframe
Where I Started
When I began my Mainframe journey as a system engineer and application developer, my primary focus was on learning the core technologies-COBOL, JCL, Db2, batch jobs, and "making the program work." Like many early-career engineers, I believed technical depth alone would define my success.
What I Learned
Over time, I realized that long-term success in the Mainframe world isn't just about mastering a specific language or tool.
It's about deeply understanding legacy systems, continuously learning, and collaborating across teams while modernizing responsibly.
Working on complex enterprise environments-IMS DB, Db2, IDMS, AIM DB, z/OS utilities, and large-scale database migrations-taught me that Mainframe is not "old tech." It is mission‑critical technology that evolves, and so must the people who work on it.
My Best Tip
Build depth first-but never stop connecting the dots.
In practical terms:
Don't just learn what a program does. Learn why it exists, how it evolved, and how it fits into the larger business and modernization roadmap.
This mindset has shaped my growth as I transitioned into architecture, modernization, and technical leadership roles.
Here's How You Can Apply It
Step 1: Understand the legacy before changing it
Before optimizing or modernizing anything, study the original design-data models, batch cycles, recovery strategies, and business constraints. Legacy systems carry decades of decisions and knowledge.
Step 2: Learn continuously beyond your comfort zone
Go beyond programming. Explore IMS internals, database utilities, performance tuning, automation, DevOps concepts, and modernization frameworks. This broader perspective opens doors to higher-impact work.
Step 3: Share, collaborate, and engage with the community
The Mainframe ecosystem thrives on knowledge sharing. Mentoring teammates, contributing internally, and engaging with the wider IBM Z and Mainframe community accelerates everyone's growth-including your own.
The Impact
Applying this approach helped me:
- Move from execution-focused roles to architecture and migration leadership
- Gain trust while working on large-scale database migrations and modernization programs
- Reduce risk by making informed, system-level decisions
- Earn recognition such as IBM Champion 2025 and 2026, which reinforced the value of learning, sharing, and community contribution
Encouragement for Others
Remember: you don't need to know everything upfront.
Start where you are.
Stay curious.
Respect the legacy.
Lean into the community.
The Mainframe space offers a rare opportunity to work on systems that truly matter-systems that power global enterprises. Growth here is continuous, challenging, and incredibly rewarding.
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Shashank Dewangan
Architect
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