Legacy Systems

Am I affected?

Untouchable parts
of the system

Due to the lack of system quality, the delivery team is afraid to introduce modifications to the system and blocks your ideas.

of productivity

Each change, even a relatively simple one, takes a long time - weeks or months.

maintenance costs

Your IT teams spend more of their time maintaining the codebase, rather than developing new services or features.


Your end users or customers complained that competitors have faster, friendlier systems for them to use.


Most of the system is tested manually, which requires an army of testers, increases costs and delays deployment of changes.

Difficulties in retention
& recruitment

It becomes harder to find talented technology specialists and keep them in a company.

Failure to modernize

You have tried to modernize your system before, but it ended in failure.

Sounds familiar?

If just one of these points hit home, then it’s a good time to look at a different, evolutionary approach and begin making improvements
right now! – Meet ELSAF framework.

The Evolutionary
Legacy System
Architecture Framework

ELSAF, developed by ITSG Global, is a comprehensive framework designed to incrementally upgrade legacy systems towards modern architectures. It is very much a phase-by-phase approach to get the most value out of targeting specific areas of the codebase that need investigation and remediation.

It is the digital adaptation of the
physical Lean Manufacturing
process based on

4 key pillars:



Incremental changes on architectural level towards modularity and loosely⁠-⁠coupled architectures based on business capabilities.



Iterative, continuous process of increasing system testability and automatability. Test automation treated as first⁠-⁠class citizen of the system.



Incremental, continuous code refactoring resulting in constant improvement of the system along with the delivery of new functionalities.



Automated, always up⁠-⁠to⁠-⁠date documentation that forms the bridge and common dialogue between IT development teams and non⁠-⁠technical business stakeholders, in terms of knowing how the system works.

Why Legacy Transformation?

It’s important to understand your business drivers for modernizing a legacy codebase.

By working with our legacy modernization teams, your business will be able to:

Cut IT spend and software development costs
Improve developer experiences
Adapt quickly to market shifts
Expand to new markets
Focus on growing business over maintaining
Improve time-to-market
Become more competitive
Eliminate regression
Enhance customer experiences

Moreover, using external experts leads to additional benefits that include:

Increased operational efficiency
Reduced hiring costs
Better employer branding and lower specialist rotation
Repositioning specialists from low-value tasks to essential tasks
Meeting compliance, security and regulation standards

Area Before After
Implementation time of the new functionality weeks, months hours, days
Time to release new functionality months, years minutes, hours
Main cost activity maintenance development
System quality unreliable, slow, unstructured reliable, efficient, modularized
Number of manual tests and QA staff needed very high low
Frequency of finding defects often rarely
Documentation outdated always up to date
Developer experience low, unappealing high, attract talents
Team organization Low cooperation, siloed teams, organized round technical concerns High cooperation, cross-functional teams, organized around business capabilities
Business support inhibits innovation enables innovation
Area Implementation time of the new functionality
Before weeks, months
After hours, days
Area Time to release new functionality
Before months, years
After minutes, hours
Area Main cost activity
Before maintenance
After development
Area System quality
Before unreliable, slow, unstructured
After reliable, efficient, modularized
Area Number of manual tests and QA staff needed
Before very high
After low
Area Frequency of finding defects
Before often
After rarely
Area Documentation
Before outdated
After always up to date
Area Developer experience
Before low, unappealing
After high, attract talents
Area Team organization
Before Low cooperation, siloed teams, organized round technical concerns
After High cooperation, cross-functional teams, organized around business capabilities
Area Business support
Before inhibits innovation
After enables innovation

Meet Our Expert

Kamil Grzybek

Head Of Software Engineering, Software Architect

Here in ITSG Global we help organizations to modernize their systems and be prepared to innovate. As a passionate about software architecture and design, I take care to provide clients with reliable and modern solutions.

Sign Up For a Free IT Consultation
with ITSG Global

  • Get a FREE 12-hour free analysis that will look at your drivers for modernizing and introduce key actions to take using our ELSAF framework.
  • Discover how ELSAF framework can incrementally modernize your application without breaking anything during transformation.
  • Get personalized vision and high level roadmap including best tools and strategies to maximize your outcome.
  • See real-world examples of how an external software partner can add value to your legacy modernization projects.
  • Speak to leading tech & business consultants with over 20 years of experience in delivering digital products and services to clients.

If you want to see how it works, take a look at our quick guide on how to deal with Legacy Systems Modernization.


If you have any questions on how our
ELSAF framework can help your business
grow – feel free to contact us.

We’ll write you back as soon as possible!

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