Legacy modernization services

Unlock the future with Luxoft’s legacy modernization services — we have a 100% success rate for mainframe modernization projects 


Modernization solutions for your business


Does your organization still rely on legacy technologies, while your competitors have modernized to the latest cloud-native architectures?

Delaying the inevitable is risky. The longer you leave it, the riskier it is.

Work with Luxoft to modernize your legacy systems — cut costs, reduce risk and ease your mind, while preserving your past investments and years of accumulated business logic with our legacy application modernization services. With advanced open-source technologies, comprehensive test coverage and continuous integration, our IT legacy modernization experts will help future-proof your software. 



Our solution 


Luxoft’s engineers will help you get to grips with your legacy estate, initiating a wealth of software modernization activities along the way. Our tried and tested methodology is so adaptable that it can be applied to any modernization project. 


Our experienced and highly skilled teams will resolve your challenges, regardless of the legacy technologies involved. We’ll help you understand the legacy software modernization scope and determine the amount of effort involved. Our modernization and development team will work with IT and business stakeholders to set and maintain realistic expectations for the work ahead. 

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Talk to one of our experts


Choosing Luxoft for legacy modernization

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20+ years in modernizing legacy applications

Clients engage Luxoft’s legacy app modernization services when they need to migrate a complex, business-critical system and keep risk to a minimum. Our top-class engineers are fluent in both legacy and modern technologies, including cloud, QA and DevOps. 

Our experts can deal with all kinds of legacy technologies, including z/OS COBOL, JCL, IMS, CA Gen, and many others. As a legacy software modernization company, we create our own tools, including compilers and code converters, in order to address extremely complex transformation challenges. 

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We help clients beat the odds

Modernizing is never as simple as some might expect. The cold, hard fact is that 77% of organizations have failed to complete at least one legacy modernization program, but Luxoft helps more companies achieve their transformation goals. On the modernization journey, we help our clients to navigate around common problems, such as:

•   Unclear understanding of the modernization scope
•   High expectations of a chosen approach and reliance on a ‘magic solution’
•   Underestimation of effort
•   C-suite and IT leadership disconnect

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Our engineers have a 100% success rate

Luxoft has helped the world's largest enterprises design and complete custom/hybrid migrations where other stock approaches have failed. We treat each legacy system modernization case as unique — that’s a significant part of our perfect track record.

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Our solutions are:

•   License-free
•   With no vendor-lock
•   Performance optimized
•   Cloud-ready
•   Ready with modern CICD pipelines and QA automation


Modernizing a mission-critical COBOL/IMS mainframe application for a Fortune 500 client

Our client was implementing a data center transition project when one mainframe application jeopardized it. Although several attempts to modernize the application were taken, none resultedthey didn’t result in a successful transition. 

The client turned to Luxoft with a request to assist them and another vendor in quality assurance on a consulting basis. Eventually, we took over the migration and: 

  • Switched the operating system from zOS to RHEL 
  • Auto-transformed JCL to Python 
  • Implemented IMSDB-to-SQL Adapter 
  • Optimized application performance with GnuCOBOL compiler optimization, caching, database and business logic optimization 
  • Implemented a robust CI/CD pipeline 



News and Insights

How to succeed in legacy IT modernization and avoid the pitfalls that make so many fail


How to succeed in legacy IT modernization and avoid the pitfalls that make so many fail


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Make your legacy modernization is smooth and efficient with Luxoft



Common approaches to modernization are: 

  • Retiring the legacy application while preserving its data for future analytics and business needs. 
  • Retaining the mainframe while modernizing the peripherals. This approach typically adds another expenditure to IT spending, as well as the potential for additional vendor lock-in. 
  • Replacing the legacy system with a commercial off-the-shelf (COTS) product from a reliable vendor. This approach typically involves unpredictable timelines and outcomes. 
  • Rewriting the legacy application, essentially replacing it with a bespoke solution. This approach is suitable for smaller applications as the development costs increase quickly with rising software complexity. 
  • Rehosting the legacy software by porting it to a new platform. It’s best considered as a temporary solution until the organization can replace or rewrite the legacy system. 
  • Rearchitecting the legacy system by converting its components to a modern tech stack using automated tools. This approach is lengthy and may result in a codebase that’s difficult to work with. 
  • Reengineering the legacy system. This is a combination of all approaches that can be used as a last resort. It may be costlier than rehosting but can also reduce spending in the long run. 

Here are the four most common reasons why legacy modernization projects fail: 

  • Stakeholders don’t have a clear understanding of the scope of work that the project should entail. It may be due to a lack of technical expertise or reluctance to turn to a consulting partner at the planning stage. 
  • They underestimate the effort that has to be put into the modernization project to attain its goals. As a result, the project is under-resourced. 
  • Senior management has overly high expectations towards the chosen modernization approach. Or, they rely on a ‘magic solution’ that they want to easily resolve all issues and allow them to quickly attain the project goals. 
  • Senior management and the IT team are disconnected, leading to misunderstandings of the technical viability of suggested solutions and unrealistic demands or goals. 

We advise considering the following nine questions when embarking on a legacy modernization project: 

  • What is your definition of the desired state after modernization is complete? Is it clear and specific? 
  • What are your application’s performance requirements? 
  • What are the implications of modernizing your system regarding business logic, data storage, security, and other aspects? 
  • How prepared is your team for the modernized system? Will they need additional training? 
  • What is your contingency plan in case critical issues arise once the modernized application goes live? 
  • What is your plan B in case the chosen approach doesn’t deliver the results you expect? 
  • Who will conduct the migration itself and the associated activities, such as quality assurance and testing? Will you turn to a vendor or do it in-house? 
  • How will you assess and ensure the quality of the modernized system? 
  • Are you allocating enough resources to the upfront solutioning and Proof-of-Concept before kicking off the full-scale modernization? 

Here are ten signs an application is legacy and requires modernization: 

  • The application is slow, cumbersome, and error-prone. 
  • Its performance leaves much to be desired: it crashes often, uses hardware resources inefficiently, and hinders users’ productivity. 
  • The software itself or its underlying technology is no longer supported by the vendor. 
  • It doesn’t run smoothly (or can’t run at all) on modern hardware. 
  • It is incompatible with more modern software systems, making its integration into a unified digital ecosystem impossible. 
  • Users have to complete advanced or lengthy training or obtain specific skills just to use the system. 
  • The application no longer aligns with business needs or helps attain the business goals it was designed for. 
  • It lacks scalability and can’t keep up with the current rate of business growth. 
  • The operating, support, and maintenance costs are astronomically high compared to its more modern counterparts. 
  • Obsolete or outdated technologies used in the application pose security threats. 

There are four key reasons to modernize a legacy system: 

  • Reducing IT costs. Legacy systems are more expensive to keep running, support, and maintain, as they may require a rare skill set and more hours of work. 
  • Enhancing agility and accelerating time-to-market. Migrating from legacy monolithic systems to modular ones allows for introducing changes and launching new features can be done faster. This boosts business agility, resilience, scalability, and ability to innovate. 
  • Improving operational efficiency. Modernizing legacy systems means giving workers better, more effective tools to do their job. This enhances their productivity – and business efficiency. 
  • Facilitating compliance. Keeping up with regulatory requirements may be next to impossible with outdated technologies due to security risks and cumbersome feature development and deployment.