BRQ and AWS
Legacy and mainframe modernizationModernize your legacy without stopping the business
Cut costs, speed up launches and prepare your critical systems for the next decade. Portfolio assessment, agentic AI and governed execution.
-2.5x
OPEX in a real case
AWS competencies in Mainframe Modernization and Generative AI
Why now
The mainframe isn't the problem. Inertia is.
250 bn
lines of COBOL in production worldwide
70%
of global banking transactions run on mainframe
90%
of credit card transactions do too
55-58
average age of a COBOL programmer, with 10% retiring every year
The mainframe isn’t a thing of the past. After years of treating it as legacy to be discarded, it has become clear that leaving the platform hastily is costly.
Today’s priority is different: reduce technical debt and prepare critical systems for the next decade, wherever they run best.
Inertia has a cost.
Keeping legacy systems in “maintenance mode” builds up technical debt and competitive disadvantage.
A hasty exit fails.
Poorly planned migrations cause disruption, delays and financial loss.
The path that works.
Modernize with method: assess the portfolio and decide, workload by workload, what evolves and how.
Challenges
The challenges that make modernization hard
Modernizing critical systems without a method is risky. Most failed projects share the same root cause: the application portfolio was never properly assessed, and resources were underestimated.
- Assessing the application portfolio to decide what to modernize and how.
- Modernizing the core without disrupting operations or affecting the customer experience.
- Going beyond code translation: handling architecture, integration, compliance, resilience and disaster recovery.
- Accelerating with AI and agents without losing control and traceability.
- Securing and retaining expertise in legacy and mainframe systems, the scarcest resource in the market.
Our method
An end-to-end journey, from diagnosis to operations
Diagnosis feeds the plan, the plan guides execution, and execution sustains operations. Four linked phases, each with its own deliverables and a clear outcome for the client, so modernization advances in waves, with no rework between stages and no disruption to what is already live.
Outcome for the client
A clear picture of the legacy estate and the decision, workload by workload, of what to modernize and which standard to apply. This is the phase that does the most to prevent failed projects.
What we do in this phase
- Assessment of the legacy environment (mainframe, VMware and critical workloads)
- TCO analysis and migration scenario modeling
- Roadmap definition aligned with AWS MAP
Outcome for the client
A wave-based roadmap, a business case with ROI, and a defined funding path, including MAP, which co-funds the assessment and mobilization phases.
What we do in this phase
- Landing Zone and base infrastructure ready to receive workloads
- Definition of the target architecture (microservices, containers, serverless)
- Wave-based migration plan prioritized by risk and value
Outcome for the client
Modernization with speed and control, built on proven standards and AI, including AWS Transform for Mainframe, with traceability and human validation.
What we do in this phase
- Layered execution: Rehost, Replatform, Refactor, Replace
- Refactoring applications into native AWS services
- Progressive integration between the legacy system and the new platform
Outcome for the client
An efficient environment, FinOps for ongoing cost management, and support and evolution of the modernized environment.
What we do in this phase
- Managed services with end-to-end observability
- FinOps and continuous cost optimization
- Well-Architected Review and continuous platform evolution
AWS competencies
Mainframe: the most critical legacy, with the most recognized partner

Standard per workload
We assess each workload and apply the right standard: replatform, refactor into modern architectures, or redesign.

Responsible use of AI
In modernization, this competency underpins the responsible use of agentic AI and gives clients the assurance of a partner vetted by AWS itself to lead AI projects.
Journey with AWS incentives
Assess
The assessment phase can be co-funded by MAP Assess, which supports the diagnosis and business case.
Mobilize and migrate
Execution can be supported by MAP Mobilize, which co-funds planning and migration, with additional incentives depending on the project profile.
AI in modernization
We accelerate with AI without giving up control
Translating code is only part of the work: architecture, integration, compliance and resilience still require engineering and experience. That's why we use AI where it delivers the most value, speeding up the most labor-intensive steps, always with human validation and traceability.
AWS Transform for Mainframe
We apply AWS Transform for Mainframe, AWS's agentic AI service built specifically for mainframe modernization. Its agents analyze COBOL, CICS, DB2 and VSAM codebases in hours or days, generate documentation and a map of business rules, and support three modernization paths.
- Refactor
Automated conversion from COBOL to functionally equivalent Java, with a code-quality uplift.
- Replatform
COBOL recompiled to run on AWS, preserving functional equivalence.
- Reimagine
Extracting business rules to redesign the application into modern architectures, such as microservices.
Across all paths, our specialists validate business rules, architecture boundaries and requirements. The result is a timeline of months instead of years, without giving up control.
AWS Transform and Kiro act as supervised refactoring engines, already responsible for these numbers in previous initiatives.
65%
reduction in project time
90%
automated test coverage
Modernization that delivers real results
See all cases
Hyundai Capital BRQ and Banco Hyundai cut cloud costs by 50% with FinOps and Managed Services
GPA BRQ and GPA modernize the marketplace and cut shipping costs by up to 40%
Confidential BRQ and a telecom carrier cut operational costs by 2.5x with migration to AWS
Confidential BRQ and a global bank modernize legacy COBOL and reduce the systems footprint by 16%





