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For industries and organizations running on legacy applications, modernization can significantly improve efficiency, security and scalability. Whether the challenge involves monolithic systems, outdated frameworks or hardcoded business logic, the process demands a clear roadmap and a sharp eye for what to preserve versus what to rebuild.
Below, members of Forbes Technology Council share essential tips for modernizing with intent and avoiding common pitfalls. For technology professionals leading these efforts, knowing where to begin—and what to sidestep—can save months of costly rework.
1. Reimagine Use Cases
Reevaluating and redefining the core use cases based on today’s user needs and tech expectations is crucial. Too often, modernization efforts fall into the trap of lifting and shifting existing on-prem applications to the cloud, preserving outdated assumptions and workflows. Modernization is not just about upgrading technology; it’s about making apps intuitive, relevant and impactful in today’s world. - Benoit Grangé, Omada Identity
2. Decouple Systems To Enable Scalable, Modular Architecture
One essential step when modernizing legacy applications is decoupling them into modular, service-based components. This allows teams to scale, update and deploy features independently while reducing technical debt. It also enables smoother integration with cloud infrastructure and modern DevOps practices. Without it, systems stay rigid, costly to maintain and unable to support rapid innovation. - John Alexander, Connect IoT, LLC
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3. Inventory Data And Dependencies
A key priority before any transformation is establishing a clear data inventory to understand the application’s architecture, dependencies, integration points and data flows. This step is particularly important for legacy systems, where documentation is often incomplete or outdated—over time, untracked dependencies may have accumulated. - Mojisola Ologe, Hydrogen Payment Services Ltd.
4. Integrate Applications Into The Broader Enterprise Ecosystem
In the era of AI and data-driven operations, it is critical to think beyond the individual function an application may serve and to understand its role in larger enterprise workflows. Very few applications can operate effectively in silos. In order to build future-proof solutions, companies need to think about the underlying data infrastructure connecting all of their applications. - Anand Logani, EXL
5. Centralize Session Management With Identity Orchestration
When modernizing legacy apps, centralizing session management with identity orchestration is essential. Single sign-on alone isn’t enough—without orchestration, sessions remain fragmented, making it hard to enforce timeouts, revoke access or audit activity consistently across multicloud environments. - Eric Olden, Strata Identity
6. Map Architecture And Data Flows
One essential step when modernizing legacy applications is to conduct an architecture analysis to map systems, databases, servers and business processes. Then, an organization should create a data flow map to understand the types of data being processed by its applications and where that data is stored. - Metin Kortak, Rhymetec
7. Assess Legacy Data For AI Readiness
One essential step is assessing legacy data quality and structure for AI readiness. Clean, well-labeled, accessible data is critical for training effective models and enabling automation. Without this foundation, AI integration will stall or fail, making early data evaluation a key enabler for successful, scalable modernization. - Dan Priest, PwC
8. Secure Team Buy-In
Team buy-in is critical. People grow personally attached to familiar tools and deeply ingrained processes, making change inherently difficult. In today’s high-pressure environment, where employees are already stretched to meet rising demands for productivity, even small disruptions can feel dismissive, or worse, disrespectful. - Ogie Sheehy, ViClarity
9. Design GRC Controls Before Migrating To The Cloud
When enterprises undergo modernization initiatives by migrating their business processes to the cloud, it is critical to plan governance, risk and compliance controls—especially access governance—before migration. While some organizations might think that simply copying existing roles is enough, this approach often results in excessive permissions, security gaps, compliance failures and segregation of duties violations. - Piyush Pandey, Pathlock
10. Modernize Incrementally
Start with a deep audit of workflows and dependencies. Then, take a modular approach and modernize piece by piece while keeping the database intact. Never replace the root system unless you’re 100% sure. This avoids disruptions, preserves critical data and ensures modernization aligns with real business needs. As usual, gray logs, branches and audits are continuous tasks. - Maulikkumar Pandya, Eatance Inc.
11. Leverage GenAI To Rethink, Not Just Rebuild
The modern code of today will be the legacy tech of tomorrow. Before modernizing legacy apps with traditional fix-and-shift methods, consider the disruptive power of generative AI. It enables smarter, faster transformation by rethinking workflows, not just migrating them. Modernize with foresight, not habit. - Rajesh Rudraradhya, Lytx Inc.
12. Adopt A Mobile-First Approach
There are many things to bring up, but I would go with integrating a mobile-first approach. A lion’s share of today’s users belong to a younger generation, and they increasingly desire the ability to manage finances on their phones. For banks, transitioning to a mobile-first app design ensures greater client convenience, which is key if they want to avoid becoming irrelevant and being swept aside. - Roman Eloshvili, XData Group
13. Upskill Teams To Support The New Tech Stack
An essential step in modernizing legacy apps is ensuring that your team has the right skills for the new technology. Companies should plan to train existing teams or hire external talent. Without this, even the best tech upgrades can stall. Success depends on having people with the right expertise equipped to build, maintain and evolve the new system. - Apeksha Jain, apeksha-jain.com
14. Decouple And De-Risk With APIs And Feature Flags
Legacy apps become legacy for a reason—usually messy, monolithic code. One key step in modernizing is using APIs and a service-oriented architecture to untangle things. Always release with a flip switch so features can be turned on or off in production instead of requiring full rollbacks. That way, you can sunset an app gradually—because all or nothing just doesn’t work for old systems. - Santosh Ratna Deepika Addagalla, Trizetto Provider Solutions
15. Host Cross-Functional Workshops To Gain Context
The key is to start with a 360-degree workshop. It provides context, not just isolated problems. One of the biggest mistakes companies make is treating challenges as separate points. In reality, every issue is connected, like communicating vessels. Modernizing one area without seeing the whole system can create more chaos than progress. - Adrian Stelmach, EXPLITIA
17. Design For Future Needs, Not Just Current Pain Points
It is important to align modernization with future customer expectations and needs, not just current pain points. Too often, teams fix what’s broken today but miss where users are going tomorrow. Designing with a forward-looking lens ensures your updated systems stay relevant, scalable and truly built for what’s next. - Rishi Kumar, MatchingFit
18. Document Business Logic Before Modernizing Code
One step I always emphasize is mapping business logic before touching the code. Legacy apps often carry years of decisions no one remembers. If you skip that step, you risk rebuilding blindly. Understanding why things were built a certain way is key to modernizing without breaking what actually works. - Nidhi Jain, CloudEagle.ai
19. Audit The Full Application To Achieve Incremental Wins
One essential step in modernizing legacy applications is a full application audit. Map every screen, flow and logic path. Identify what must be migrated, what can be improved and what can be left behind. Then apply a strangler pattern to replace high-value sections first. Full rewrites rarely cross the finish line—incremental wins are how you get there. - Andrew Siemer, Inventive
20. Preserve Key Functions To Minimize Disruption
One essential step when modernizing legacy apps is identifying core business functions to preserve. It ensures you don’t lose critical value during the transition and helps you prioritize what to rebuild, refactor or retire, making the process smoother and more cost-effective. The No. 1 rule of thumb is making sure there is no service interruption for customers. - Ajit Sahu, Walmart