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Trunk-Based Development and the End of Merge Hell

February 16, 2026

Many engineering organizations operate under a branching strategy that looks something like GitFlow: engineers checkout a long-lived feature branch, spend weeks writing code, and occasionally rebase against main.

This seems logical. You want to isolate work to prevent developers from stepping on each other’s toes.

The reality? You simply delay the pain of integration.

Merge Hell

When it finally comes time to merge that four-week-old feature branch, the main branch has completely evolved. Code conflicts are everywhere. Variables have been renamed. The database schema has shifted.

The engineer spends three panicked days resolving merge conflicts, inevitably introducing subtle bugs. CI/CD pipelines fail. Frustration mounts. This is widely known as “Merge Hell.”

It happens because isolation is an illusion. Software systems are highly coupled, and deferring integration increases risk exponentially.

Continuous Integration requires Trunk-Based Development

To genuinely practice Continuous Integration, you must integrate your code continuously. This means committing to the main trunk every single day.

How, exactly, does an engineer commit half-finished, broken features into the main production branch without destroying the application?

Feature Flags.

The Power of the Dark Launch

When you use a platform like GoGreen Flags, Trunk-Based Development becomes effortless.

Instead of isolating the code in a long-lived Git branch, you isolate the code in production.

An engineer starts a new feature by immediately creating a flag: new-billing-engine. They write the first piece of code—perhaps just a new API route that returns a hardcoded 200 OK—wrap it in the flag, and merge it straight into main that same afternoon.

The code goes to production. But because the flag is defaulted to False for all users, the code is dormant. It’s fully “dark launched.”

Tomorrow, they write the database logic and merge it. The next day, the UI components.

All this time:

  1. They are continuously integrating with everyone else on the team, preventing large-scale drift.
  2. They avoid catastrophic merge conflicts.
  3. The production system remains perfectly stable.

Once the feature is completely finished and tested locally (by turning the flag to True for just their development machine), they simply toggle the switch in the GoGreen dashboard.

The feature branch is dead. Long live the trunk.