Why IT Begins to Fail During Growth Phases

Introduction

For many companies, IT problems surface not “when growth stops,” but rather in the midst of a growth phase, when business is expanding and sales are hitting record highs. This article organizes why IT alone reaches its limits during a period when the business should be thriving, not as a technical discussion, but as an inevitable consequence of absent management decisions and design.

What Breaks is Not the “System” but the “Assumptions”

IT troubles during growth phases manifest as increased failures, delayed modifications, and a loss of the overall picture. However, what is actually breaking is not the code or infrastructure itself, but the initial assumptions made during the early growth stage, which can no longer withstand the current scale of the business.

Initial IT is Built for a “Small Team Premise”

IT at the launch stage is designed based on limited assumptions: a limited number of people, a limited volume of work, and limited exceptions. Under these premises, having people make judgments, adjustments, and absorb exceptions was the fastest and most rational method.

Growth Causes Exceptions to Explode

As the business grows, customer attributes diversify, transaction patterns increase, and organizations/locations expand. As a result, the total volume of exception handling increases exponentially, and the exceptions that people previously absorbed become impossible for them to handle.

Change Costs Suddenly Skyrocket

System changes that felt manageable in early growth—”it’ll work with a small fix” or “we can handle it overnight”—transform during the growth phase into a state where “the impact scope is unpredictable,” “making fixes is scary,” and “it breaks every time we touch it.” This is the inevitable outcome of IT that lacks designed reproducibility and boundaries.

Technical Debt is Also a “Sign of Growth”

The technical debt that becomes apparent during growth phases is not the result of negligence or failures in technology selection. It is a side effect of the management decision to prioritize growth speed above all else. The problem lies in not having decided when to address that side effect and who would make that judgment.

IT Begins to Appear as the “Entity Halting Growth”

At this stage, the business side begins to see IT as “the bottleneck,” “IT is slow,” and “IT is holding us back.” However, this is not because IT has degraded, but because the design based on the initial assumptions was not updated even though the growth phase changed.

What Management Judgment Was Lacking?

The primary reason IT begins to fail during growth is that management failed to explicitly answer: “How long will we run on the initial assumptions?”, “At what point do we switch the design?”, and “Who is responsible for making that decision?” What broke was not IT, but the absence of decision-making.

The Moment “It Can’t Be Helped for Now” Becomes the Norm

At this stage, phrases like “We’re too busy now,” “We’ll do it when growth stabilizes,” or “In the next phase” are repeated. However, the timing to update the design before the growth phase ends never arrives. Problems become chronic, debt accumulates, and eventually, the company is forced into a situation where the only option is a complete rebuild.

The Next Question to Ask

The question here should not be “Why did IT break?” but rather “Until which phase did we decide to use the IT built on which assumptions?” In the next article, we will examine the structure that leads to endless tool adoption and why ad-hoc responses during growth phases further complicate IT.