Integration of Legacy Systems: The Dilemma of Growing Companies

The second wave, between the 4th and 8th month, focuses on automations that eliminate unnecessary manual work. It is at this moment that we implement integrations with marketing tools, automatic billing systems, or customer service platforms. The legacy system remains the operational core, but it is now surrounded by modern tools that amplify its capacity.# Integration of Legacy Systems: The Dilemma of Growing Companies

Your company has grown 300% in the last three years, but some signs have started to appear:

• The system that organized 50 orders per month now crashes with 500

• The ERP that worked perfectly for 10 employees no longer communicates with the new e-commerce

• The reports that used to come out in one hour now take an entire day to be generated

• Processes that were automatic have returned to needing manual intervention

It is exactly at this moment that many growing companies face a dangerous temptation: to throw everything away and start from scratch. The reality, however, is more complex than it seems.

Why Discarding Old Systems Can Be a Costly Mistake

That "outdated" system that is causing headaches carries with it years of specific configurations, validated processes, and, most importantly, historical data fundamental to the business. According to a 2024 research by consulting firm Gartner, companies that completely discard legacy systems during modernization processes face 40% more operational problems in the first six months compared to those that opt for gradual integration.

Imagine a distributor that has operated for 15 years with an old desktop ERP but knows its delivery routes, customer history, and specific seasonalities perfectly. Replacing all of this with a new system means not only investing in software but also months of parameterization, data migration, and, most importantly, re-adaptation of processes that are already working.

The real problem is not the old system itself, but its inability to communicate with the new tools that the company needs to grow. It is like having a house with a solid foundation, but needing new rooms. It makes no sense to demolish everything when it is possible to build smart bridges.

The central issue is to recognize that modernization does not necessarily mean replacement. Brazilian companies that manage to keep their core systems running while adding new functionalities through integrations tend to have smoother transitions and lower implementation costs.

Smart Strategies for Gradual Integration

Gradual integration works like a well-planned renovation: you keep the house functioning while building improvements. The first step is to precisely map which processes of the old system still add value and which are the real bottlenecks.

An efficient approach is to start at the edges of the process. If the old ERP manages inventory and finances well but fails in the commercial part, the solution may be to implement a modern CRM that connects to the existing system through APIs. This way, salespeople gain current tools for prospecting and follow-up, while orders continue to be processed by the system that the operation already knows.

Based on our experience with distribution clients, this strategy allows the company to maintain a stable operation while testing and validating new functionalities. If something does not work as expected, the impact is controlled and reversible.

Another proven strategy is the "layer by layer" approach. First, we create a unified data layer that allows viewing information from different systems in centralized dashboards. Then, we implement automations that synchronize data between the old and new systems. Finally, when the integration is mature, certain modules can be gradually migrated.

APIs: The Technological Bridges Between the Past and the Future

APIs function as universal translators between systems that speak different languages. They allow a 2010 ERP to converse naturally with a 2025 e-commerce site without either needing to be internally modified.

The power of APIs lies in transforming closed systems into components of an integrated ecosystem. Practical benefits include:

• Automatic synchronization: When an order is made on the e-commerce site, the API automatically informs the old ERP to reduce inventory, issue the invoice, and trigger the logistics process

• Reduction of manual work: In projects we have developed in the last two years, we observed that companies with a good API strategy can reduce the time spent on manual synchronization processes by up to 60%

• Future flexibility: If in two years the company decides to change the financial system, it is enough to reconnect the APIs, and the rest of the ecosystem continues to function normally

A practical example is a medical equipment company that integrated its legacy ERP with a new online scheduling system. Customers schedule technical visits through the website, and automatically the old system organizes the schedule of technicians and separates the necessary parts.

Realistic Timeline for Technological Modernization

An efficient modernization timeline generally follows a wave pattern, where each phase addresses specific problems without compromising operations:

• First wave (2 to 4 months): Focuses on connecting existing systems and creating visibility of data through integrated dashboards. During this initial phase, it is common to discover that some "problems" of the old system were actually process issues or lack of integration.

• Second wave (4th to 8th month): Focuses on automations that eliminate unnecessary manual work. It is at this moment that we implement integrations with marketing tools, automatic billing systems, or customer service platforms. The legacy system remains the operational core, but it is now surrounded by modern tools that amplify its capacity.

• Third wave (selective, 12 to 18 months): Some specific modules of the old system can be replaced with modern solutions, but always maintaining the integration with what continues to work well. This process can extend over 12 to 18 months, depending on the complexity of the operation.

The realistic timeline recognizes that modernization is an ongoing process, not a project with a final date. Companies that manage to establish a sustainable pace of technological improvements tend to adapt better to market changes and growth needs.

The secret lies in not trying to solve everything at once, but rather building a solid foundation of integration that allows for constant evolution. After all, the goal is not to have the most modern system on the market, but the most efficient operation for your specific business.

Key Lessons from Smart Integration

• Preserve what works: Old systems carry years of specific configurations and business knowledge

• Integrate gradually: Wave-based approach reduces risks and keeps the operation running

• Use APIs as bridges: Connect different systems without modifying any internally

• Think ecosystem: An integrated system is worth more than several isolated modern systems

Companies that understand this early can transform their "old systems" into competitive advantages. After all, a system that knows your business deeply and can still connect with the modern world is a valuable asset, not a liability to be discarded.