Our Automated Assembler Refactoring solution provides a turnkey modernisation of your Assembler assets to Java or C#, and your associated mainframe databases to relational models deployed to the Cloud or on premises. These modern Cloud-enabled applications and databases are functionally equivalent to their legacy counterparts, eliminating the hassle and expense of assembler and the mainframe. This reduces cost, allows for deeper integration, and enables customisation to meet business requirements.

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Discussing the 2022 Mainframe Modernisation Report

60 minutes

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Why modernize?


Scarcity of domain expertise

Developers who understand assembler and other mainframe languages are reaching retirement age and no one is being trained to replace them, resulting in a steadily diminishing talent pool. As this shortage grows, the costs and risk of relying on assembler will continue to rise.

Limited flexibility

Companies are rapidly moving to modern environments and practices such as DevOps and the Cloud. Assembler and the underlying systems that support it were not designed for modern IT, resulting in difficult integrations and limited flexibility.


Exorbitant costs

Mainframes cost as much as 4,500 per cent more to operate than equivalent Cloud counterparts. This figure is compounded by rising licensing and maintenance fees for ancillary mainframe applications and databases. 

Automated Assembler Refactoring


Our Automated Assembler Refactoring solution preserves the benefits of legacy systems while empowering organisations to leverage the advantages of newer platforms, especially the Cloud. This unlocks a whole new world of quality and scalability from automated testing to quality assurance, and the ability to leverage containerised deployments and orchestration with Docker and Kubernetes.

There are several characteristics of assembler that are unlike those of other languages which are impactful enough to require special consideration. For example, since assembler is byte-oriented, it is common to come across bit-level instructions and pointers that do not have equivalents in other languages. The combination of system specificity, instruction intent obscured by byte-orientation, and a general lack of expertise available in the marketplace, render proper handling and modernisation of assembler code incredibly difficult. By employing the unique combination of time-tested software and hardened assembler expertise that we offer, it is possible to reduce the high risk associated with migration and successful modernisation of environments containing assembler.

To account for the unique challenges assembler presents, our Automated Refactoring process follows two passes. During the first pass, all source assembler programs and macros (except for user-generated macros) are processed directly.

In the second pass, complex user macros and code included in the areas of concentration identified during assess and design are handled with special care. Assembler listings are processed, producing an intermediate source program, within which all system and simple macros are retained in their original, compressed format. Complex user macros and select components are expressed in expanded format, as developed by the IBM HLASM compiler. If necessary, each macro and special case is converted individually using case-specific settings within our proprietary software to ensure code quality.

Once the assembler programs and related databases are refactored, Java and C# developers can extend application functionality for Cloud optimisation using standard DevOps tools and CI/CD concepts that simply aren’t available for mainframe applications. Precious business logic from the legacy system is preserved, while levels of optimisation can be applied to deliver efficiencies and business benefits such as elasticity, granular service definition, and easy integration with Cloud-native services.

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Over 35 years of assembler and mainframe modernisation experience

More than 500 successful modernisation projects completed

Over 2.5 billion lines of code refactored through automation

Intelligent modernization, unparalleled experience


Additional resources to help you modernise



Modernisation: No assembly required

This whitepaper answers common questions faced by organisations looking to ditch mainframe assembler, and outlines our own solutions.

Read whitepaper





Fiserv: Modernising the Galaxy platform

Learn how Fiserv reduced the risk of failure, eliminated vendor lock-in and lowered operating costs through modernising their custom platform.

Read case study





2022 Mainframe Modernisation Report

Exploring the impact of the new era of digitalisation and change on the current state of legacy systems and organisations' modernisation plans.

Read report



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02 Dec 2022 by Tim Jones, Managing Director of Application Modernisation, Advanced

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21st Oct 2022 by Tim Jones, Managing Director of Application Modernisation, Advanced

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24 May 2021 by Rob Anderson, Vice President of Marketing and Product, Advanced

News & Opinions

// 08-06-2023

Webinar recap: Natural Adabas: Closing the skills gap and reducing risk

by Rob Anderson, Vice President of Marketing and Product for Application Modernization

Webinar recap: Natural Adabas: Closing the skills gap and reducing risk.