Why engineering hires fail by month six

When an engineering hire fails inside six months, the postmortem almost never says “could not code.” The technical bar did its job. What failed was everything the interview loop did not measure.

The four usual causes

First, stage mismatch: an engineer calibrated to a large org’s scaffolding joins a startup and stalls without process around them, or the reverse. Second, working-style collision: a deep-focus engineer inside a meeting-heavy team, or a collaborative one left alone in a silo. Third, expectation drift: the job sold in the interview is not the job on the calendar. Fourth, onboarding neglect: no clear first win, no owner, no feedback until it is too late.

Why interviews miss these

Interviews measure performance under observation for a few hours. The failure modes above only show up in ordinary weeks: how someone handles ambiguity, feedback, and pace over months. Candidates optimized for interviews sail through loops and then meet reality. This is exactly the gap psychometric screening and culture mapping exist to close, which is why we run them on every shortlist.

What retention-first hiring looks like

Screen for stage explicitly: ask what resources the candidate had around them in their best role, and compare honestly with what you offer. Map your team’s actual working culture instead of its aspirational one, then screen against that map. Sell the job truthfully, including the rough parts; a candidate who joins with accurate expectations does not spend month three feeling deceived.

The first ninety days are part of the hire

Retention is decided early. A defined first project, a named onboarding owner, and a written thirty-sixty-ninety plan turn a good hire into a durable one. Across our placements, retention improved when fit was screened before offer and onboarding was planned before day one. That combination is the whole game.

A failed hire costs far more than a careful search. If your last engineering hire did not stick and you want the next one to, book a demo and we will show you where the process leaked.