Quantified achievement
Also called impact bullet, achievement bullet.
A resume bullet that states what changed and by how much, rather than what you were responsible for.
"Responsible for the onboarding flow" describes a job description. "Rebuilt onboarding, lifting activation from 34% to 51% in one quarter" describes a person. The second is what a hiring manager is scanning for, because it's the only kind of statement that distinguishes you from everyone else who held the same title.
Not every role produces clean metrics, and inventing them is worse than not having them. When you don't have a number, scope works: how many people, how large a system, how much money, over what period, compared to what before. "First engineer on a team that grew to nine" carries information. "Worked on a team" doesn't.
Verbs carry weight here too. Led, built, rebuilt, cut, shipped, migrated and negotiated all say you decided something. Assisted, supported, participated and helped say someone else did. Use the honest one — but notice how often people reach for the weak verb to describe work they actually owned.
Master resume
A complete, unedited record of everything you've done, kept privately as the source you cut every real resume down from.
Resume tailoring
Rewriting an existing resume for one specific posting so the relevant experience is the visible experience.