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

Implementation time of the new functionalityweeks, monthshours, days
Time to release new functionalitymonths, yearsminutes, hours
Main cost activitymaintenancedevelopment
System qualityunreliable, slow, unstructuredreliable, efficient, modularized
Number of manual tests and QA staff neededvery highlow
Frequency of finding defectsoftenrarely
Documentationoutdatedalways up to date
Developer experiencelow, unappealinghigh, attract talents
Team organizationLow cooperation, siloed teams, organized round technical concernsHigh cooperation, cross-functional teams, organized around business capabilities
Business supportinhibits innovationenables innovation
AreaImplementation time of the new functionality
Beforeweeks, months
Afterhours, days
AreaTime to release new functionality
Beforemonths, years
Afterminutes, hours
AreaMain cost activity
AreaSystem quality
Beforeunreliable, slow, unstructured
Afterreliable, efficient, modularized
AreaNumber of manual tests and QA staff needed
Beforevery high
AreaFrequency of finding defects
Afteralways up to date
AreaDeveloper experience
Beforelow, unappealing
Afterhigh, attract talents
AreaTeam organization
BeforeLow cooperation, siloed teams, organized round technical concerns
AfterHigh cooperation, cross-functional teams, organized around business capabilities
AreaBusiness support
Beforeinhibits innovation
Afterenables 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!