Mainframe
Services
You can’t beat great professionals and rock-solid technology.
Tool Replacement: Reducing Cost and Complexity
Many organizations rely on specialized mainframe tools for security, automation, monitoring, and operations. Over time, these tools can become expensive, overlapping, or difficult to align with current technical and sourcing strategies.
Tool migration projects are inherently complex and always mission critical. They affect procedures, access models, automation logic, monitoring practices, operational habits, audit requirements, and team responsibilities.
CROZ supports customers through controlled tool replacement projects — from assessment and migration planning to implementation, testing, documentation, and knowledge transfer.
Our experience includes replacement and migration scenarios involving CA/Broadcom, BMC, IBM, and open-source-based tooling.
Read our case studies to learn more!
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Future-proofing mainframe
15 (+1) Ways to Reinvent Mainframe Modernization
Future-proofing mainframe
Modernization is not a one-off project. It is a set of daily actions — every week, Monday through Friday. That is why Armin Kramer, Head of Mainframe at CROZ, created the concept of “15 (+1) Ways to Reinvent Mainframe Modernization.”
Instead of chasing marketing buzzwords, we focus on pragmatic, sustainable technical improvements that preserve what mainframe does best: exceptional security, reliability, and processing power.
And finally, the “+1” — the most important factor of all: people and their mindset.
CROZ supports practical modernization initiatives such as:
Understanding of legacy mainframe environments
AI-assisted software development cycle
zDevOps based on open standards
Integration across applications and data
AI is introduced carefully, with attention to data sensitivity, access control, auditability, and human review.
Mainframe modernization is not about replacing a powerful platform, but about changing how organizations use it.
Mainframe Managed Services
Think of managed services as a helpful friend you bring in when your mainframe starts acting up. You know, those tech-savvy buddies who can work magic and save the day. Usually, CROZ experts take responsibility for certain parts of the mainframe infrastructure. The customer team remains in place, while CROZ specialists are handling part of the activities, acting as a part of the customer team. The managed services model generally fills the skill gaps, reduces costs, improves service, and lets your team focus on more strategic goals.
Moreover, by using the managed service, the customer team is empowered by CROZ experts and they can jointly enhance and optimize the mainframe infrastructure. Employing a “CROZ Mainframe Managed Services” provides true partnership, rather than mere outsourcing of certain activities.
Old school where it matters. Modern where it helps.
Skills We Bring
Old school where it matters. Modern where it helps.
We cover the full mainframe technology stack—from foundational layers to integration, automation, observability, and cloud-native tooling.
MAINFRAME IS NOT AN ISLAND
What To Expect From Us?
Mainframe consulting is our craft. We combine deep IBM Z expertise with modern engineering practices and have delivered more than 200 projects across Asia, Europe, Africa, and North America.
The mainframe is not a legacy exception, nor an isolated technology island. It is simply just another platform in the data center—one that deserves the same engineering discipline, automation, security, observability, and integration as any other mission-critical system. Instead of chasing modernization buzzwords, we focus on practical improvements that make systems easier to operate, secure, integrate, and evolve.
We work side by side with our clients, strengthening teams, transferring knowledge, and helping organizations address skill gaps before they become business risks. From tool replacements and security migrations to managed services and AI-assisted engineering, we bring a pragmatic mindset, proven expertise, and a genuine passion for the platform.
Practical notes from the world of IBM Z
Mighty Mainframe Newsletter
Mighty Mainframe Newsletter covers real project stories, everyday modernization lessons, skills, tooling, new generations entering the platform, and AI topics.
Written by CROZ co-founder and board member Krešimir Mudrovčić, a mainframer by heart, it is written for people who like their mainframe content grounded, opinionated, practical, and free of marketing buzz.
If you have any questions, we are one click away.
