Adopting Trunk-Based Development is not only a technical decision but an organizational one. It enables continuous integration, reduces merge conflicts, and accelerates delivery. However, it requires a solid mechanism to control incomplete features in production. This article explores how to build an internal Feature Flags solution compatible with OpenFeature, the operational challenges that arise, and how to solve them with observability and technical discipline.
Moving toward true continuous integration means eliminating long-lived branches and merging code into the main branch daily. If an incomplete feature reaches production, the impact can be immediate. This is where Feature Flags stop being an optional tool and become strategic infrastructure.
Before implementing Feature Flags in the backend, there was a structural asymmetry:
In that context, adopting Trunk-Based Development without a control layer would have been technically reckless. Integrating changes daily into the main branch without a controlled activation mechanism means any partially developed feature could impact production. The problem was not only technical. It was one of governance, operational risk, and architectural sustainability.
The goal was not simply to toggle features on or off. It was to build a structural layer that would allow:
It wasn’t about buying a product; it was about aligning architecture with engineering strategy. The decision to develop an internal solution based on environment variables responded to a concrete need: operational simplicity today, strategic flexibility tomorrow.
Trunk-Based Development as a discipline Trunk-Based Development removes long-lived branches and forces small, daily integrations.
This generates:
In this model, fine-grained control over what is activated in production is required. Without flags, trunk-based development becomes a risk.
Feature Flags enable:
In the backend, their implementation must be:
For that reason, we opted for an implementation compatible with OpenFeature, enabling standardization and future migration to external solutions if necessary. Designing open standards is not a tactical choice it's an architectural one.
The real problem with Feature Flags is not technical, it's operational. Over time they tend to:
Without discipline, the system degrades. To avoid this, a clear policy was introduced:
We developed a Flag Reporter that:
This is not just automation; it’s introducing observability and governance into the development cycle, because in mature systems quality depends not only on the code, but on how its evolution is controlled.
Feature Flags are not merely conditionals in code, they are a strategic control layer within the delivery cycle. Adopting Trunk-Based Development without disciplined flag management is opening the door to invisible incidents. Implementing it with open standards, automation, and governance turns continuous integration into a real advantage. Speed without control creates debt. Speed with architecture creates competitive advantage.
