“…which meant…”

When to use it

Linking an action to its consequence. Makes the "so what" explicit.

What it replaces

Stopping after the action and hoping they infer the impact.

The hedged version is not wrong English. It is English that asks the interviewer to do the work of deciding whether you meant it. The confident version makes the decision for them.

In an answer

“I moved the check to the start of the pipeline, which meant bad files were rejected in seconds, not hours.”

How to make it automatic

1. Say it aloud five times now, at normal speed, with contractions.
2. Pick one story from your own work where it fits, and say that story once using it.
3. Record a 60-second answer tomorrow and listen for whether it came out on its own.