Legacy Application Modernization: Expert CTO Advice & Insights

Let’s clear up a common misconception: Digital transformation isn’t just a one-time service you can buy off the shelf. It’s a journey that evolves as your business grows and changes. 

A 2024 survey by Gartner found that by 2023, about 40% of business processes were improved using digital tools, and around 25% of total revenue came from digital products and services. 

For those leading apps and software services, the growing importance of digital transformation is apparent. But many older legacy systems are holding businesses back and making it harder to adopt new technologies quickly and efficiently. 

That’s why modernizing these systems is so important. In fact, nearly half of the survey respondents pointed out that updating and improving their existing enterprise applications is a top priority for the next year.

For CIOs, CTOs, and Tech Leaders, it’s important to know that completely overhauling these systems is often not practical. It’s expensive, risky, and time-consuming. 

The solution? Instead of trying to replace these old systems all at once – also known as a Rip-and-Replace approach – it’s smarter to take a safer, continuous modernization approach.

As the name suggests, continuous modernization means continuously identifying and fixing issues that hinder the continuous delivery of value to customers. By doing so, you gradually make these old systems more flexible and capable by upgrading certain parts without disrupting the whole operation. 

Here are some risks associated with a typical rip-and-replace approach. 

• Cost, Risk, Disruption: Replacing an entire system is not only expensive and risky, but it can also cause major disruptions. Most organizations find this too much to handle.
• Time: Even if you have the resources for a rip-and-replace approach, it could take a year or more to complete. Oftentimes, businesses can’t afford to wait that long – they need solutions urgently.
• Uncertainty: It’s hard to know exactly what your future digital requirements will be. As demands change, trying to overhaul your systems all at once can quickly become outdated or misaligned with what you actually need.

Here’s how CIOs and CTOs should handle legacy system modernization. 

Align Technology Changes with Business Goals

Determine what drives your business growth. 

Is it launching new business models? Expanding into new markets? Or providing quicker, higher value to your existing customers? 

Once you know your focus, you can choose the technology or application that will make the biggest difference.

Next, look at your older systems that align with these goals. For instance, if expanding into new markets is your priority, you might need to update your accounting software to handle transactions in multiple currencies.

Finally, assess the impact of modernization on your business. You can measure this in 3 ways:

• Cost of maintaining legacy systems including software and hardware upkeep, subscriptions, and training
• Expected benefits from modernization like new business from new products, time savings, and reduced maintenance.
• Estimated losses from downtime e.g., a report found that 37% of businesses lost customers, and 17% lost revenue due to downtime.

Implement Continuous Modernization

It’s best to start with a step-by-step approach rather than trying to replace everything at once. This process is known as continuous modernization. 

Continuous modernization is a step-by-step method for finding, prioritizing, and fixing issues in old systems that slow down digital business. These issues, often called friction points, are where the technology or development process can’t fully support what the business needs or keep up with demand.

This approach involves multiple steps and is organized into 3 main stages: 1) Assess and Prioritize, 2) Transform, 3) Refine and Repeat. 

1. Assess and Prioritize

• Identify business capabilities supported by the legacy application and assess their contribution to business value streams and customer value.
• Pinpoint specific components of the legacy application that support each business capability.
• Assess support levels for each business capability. Identify any modernization drivers like poor business fit, value, agility, high complexity, risk, or cost.
• Prioritize friction points using TIME analysis and discuss them with stakeholders to create a backlog of modernization activities.

2. Transform

• Analyze the cause behind each friction point and select an appropriate modernization approach, such as encapsulating, replatforming, refactoring, or replacing components.
• Execute the modernization activities to remove friction points and improve business support.

3. Refine and Repeat

• Reevaluate the backlog to include any new or changed priorities.
• Select the next activity from the backlog and repeat the process starting from the analysis of friction points.

Have a Business Continuity Plan

When modernizing applications, some downtime is inevitable – whether it’s during testing, migration, or switching to a new system. 

It’s very important to minimize this downtime’s impact on your business. While IT leaders are familiar with managing downtime, here are some pro tips to make it easier. 

• Keep everyone informed so they can adjust without causing delays or disruptions. 
• Plan for outages so the team knows to protect data and keep it accessible. 
• Prepare for disaster to recover quickly if your primary site goes down. 
• Measure the impact of the downtime with KPIs and specialized dashboards. 
• Collaborate across teams (IT, Development, Third-Party) to speed up response times.
• Regularly test your business continuity plan, so it’s agile enough to handle downtime.

Legacy Modernization is a journey,  not a destination. It’s not a one-time task but an ongoing process that requires careful planning, continuous improvement, and close alignment with your business goals.

By focusing on continuous modernization, you can ensure that your systems remain flexible, efficient, and capable of meeting the demands of today and the future.

The goal is to improve gradually, minimizing risks and disruptions while maximizing the value delivered to your customers.