- Amanda Mahoney
- July 23, 2025
Addressing Legacy Modernization Challenges one Agent at a Time

A key concept driving the transition toward AI-enhanced workplaces is the digital workforce. At the recent AWS Summit in Washington, D.C, our Chief Architect Kartik Mecheri likened the future of the humans building platforms for AI-enabled work to Pokémon trainers, guiding and training their agents to fulfill specific roles as part of a broader agile team. Kartik and the AI experts at Karsun Solutions built the ReDuX platform, which orchestrates these agents, to accelerate every step of the legacy modernization process from discovery to delivery.
ReDuX is part of Karsun Solutions, a modernization company with 15 years of experience with complex, mission-critical legacy systems. Its innovators custom built ReDuX to address the most common issues faced by technology teams. These experts have shared their insights at industry forums, podcasts and elsewhere. Let’s discover how they are tackling these challenges today.
The Legacy Challenge
ReDuX addresses three common legacy system modernization challenges:
- Shrinking workforces, with tightening timelines constrain modernization efforts that already face significant challenges due to the complexity and interconnected nature of tightly-coupled, monolithic systems.
- Many enterprises still rely on mission-critical systems developed decades ago. Legacy systems are often mission-critical and cannot simply be turned off for upgrades.
- Government agencies and other large organizations are under pressure to deliver better experiences to their customers. Modernization projects require an iterative, flexible approach.
Establishing Subject Matter Expertise, Training SMEs
As veteran employees retire, the deep knowledge of these legacy systems often leaves with them. ReDuX blueprinting agents capture legacy system expertise as subject matter experts (SMEs) retire. Over time agents are trained to become digital SMEs becoming a valuable and enduring resource for their teams.
Modernizing Mission-Critical Applications
Understanding the importance of mission-critical applications, ReDuX blueprinting agents delve into legacy code, extract crucial information, integrating it with user guides and demonstrations. Building a comprehensive view helps teams identify early pitfalls and investigate to avoid missing critical functionality. Meanwhile, transformation agents support teams as they devise strategic modernization plans.
Reimagining Experience
ReDuX improves Customer Experience (CX). Since ReDuX produces a blueprint, teams have a visual representation of how system components connect.Teams make meaningful choices.
Working with transformation agents, modernization teams can add functionality to the modernization system, iterate design using stakeholder feedback loops, and achieve efficiency at scale by automating manual tasks, allowing humans to focus on higher-value work. ReDuX takes modernization efforts from lift-and-shift to the experience upgrade that customers expect.
Delivering Results with ReDuX
Karsun has successfully used ReDuX to migrate multiple mainframe COBOL applications and other legacy systems, such as Visual Basic 6 (VB6), to modern technologies. This AI-powered approach can accelerate modernization by 4x and reduce costs by 2x. ReDuX also mitigates risk in modernizing mission-critical systems by incorporating human-in-the-loop validation, where human team members validate agent outputs, and generated code quality and functional equivalence are thoroughly tested. Kartik has previously shared that ReDuX helped one customer complete a five-year program in just four years.
Looking ahead, our ReDuX experts predict that within a year, there will be more demonstrable examples of AI deployment with clear business benefits. Leaders will need to balance AI’s promise with its risks, including mitigating hallucinations, improving accuracy, and reducing security risks. Identifying technology partners with the necessary strategic relationships is also crucial for effective technology implementation in this evolving environment.
The modernization journey for mission-critical legacy systems is complex, but innovations like ReDuX are making the path to more efficient, agile, and secure enterprise systems clearer.
2X
Reduced Effort