Onboarding a senior hire is a ninety-day trust exercise

Enormous effort goes into landing a senior hire: the search, the courtship, the negotiation. Then they arrive, and the energy stops. They get a laptop, a week of generic induction built for the graduate cohort, and a wait for access, for context, for something real to own. That gap is where the doubt starts. A senior person notices immediately when the intensity that recruited them doesn't survive their start date.

The first quarter is really the window in which the hire privately answers the question they carried in from the interview: was this real? Everything they were promised about scope and mandate either shows up as decisions they get to make, or fails to, and they draw their conclusion. There's no formal moment where this happens. It accumulates, quietly, out of a dozen small signals about whether the organisation meant what it said. By the time a probation review rolls around, the verdict is usually already in.

We see the cost of getting this wrong on the other side, when a placement we were proud of comes loose inside the year. Almost all of those departures trace back to one place: what happened, or didn't, in the first 90 days.

The centres that keep their senior hires treat the first 90 days as a deliberate handover of trust. A real decision to own inside the first weeks. Direct access to the leaders and context they need. A clear picture of what they're accountable for and the authority to act on it. The signal to the new leader is that the mandate was true, and that the organisation is as serious now as it was during the chase.

The instinct runs the other way. A new senior hire is treated as someone who has to earn their way in, proving themselves for a quarter before real decisions come their way. For a graduate that's reasonable. For a leader hired precisely to make decisions, it reads as a demotion from the role they accepted. Every week they spend waiting for authority is a week they spend recalculating whether the move was a mistake.

Get this wrong and the failure is invisible for a while. A disengaged senior hire doesn't resign in month 2. They stay, do the minimum, keep their network warm, and leave in year one for a role that looks like the one they thought they'd taken. The 90 days after the offer are cheaper to invest in than the re-search after they go.

There's one disappointment we hear more than any other from senior hires in their first weeks, and it comes out in different words each time. The decisions I thought were mine aren't. I have the title but not the room. Everything still routes back to the parent. I'm a Head of something with the authority of a manager. Strip the phrasing and it's always the same complaint: the title was bigger than the mandate.

It surfaces early because it can't hide. A senior person tests the boundaries of their authority almost immediately, because that's what senior people do. The first time a call they expected to make gets escalated over their head, the gap is exposed, and no amount of impressive title survives it. This is why onboarding is where the problem lands even when it was created much earlier, at the offer. A grand title over a thin mandate tells the hire the role was oversold and someone knew it while they wrote the letter.

The instinct that creates the gap is understandable. When the real mandate is modest, a bigger title helps close the candidate, and it works right up until they start. Then the inflated title becomes a daily reminder of the distance between what was promised and what they hold. The centres that keep senior people do one of two honest things: they give the mandate the title implies, or they describe the role at the level it truly sits and hire someone who wanted exactly that. Both work. Selling authority you have no intention of handing over is the one path that reliably ends in a resignation, and the 90-day window is where that decision quietly gets made.

Most centres do watch for early disengagement. The trouble is what they watch it with. Engagement surveys ask about the things that are safe to ask about: workload, benefits, work–life balance, whether the tools work. Those are real and worth knowing. But when we sit with senior people who've just resigned, the reasons that surface are almost never on the form. The mandate that never grew into the title. The manager they lost faith in. The decision that got taken away in week 3. The slow, accumulated sense that the ceiling here was lower than advertised.

None of that fits a 5-point scale, and most of it is too specific or too politically loaded to write down while you still work somewhere. So the pulse survey comes back green, or greenish, and reads as reassurance right up until the resignation the dashboard never saw coming. The instrument is measuring the workplace while your best hire is quietly evaluating their career, and in the first 90 days, that evaluation is running hot.

The centres that see attrition coming supplement the instrument with something it can't replicate: a real, off-the-record conversation with the new leader, run by someone they trust and no one they report to, at day 30 and again at day 75, where the career-shaped reasons can actually be spoken. That's where the mandate gap or the missing line of sight shows up while there's still time to fix it. The lesson is to stop treating a green score as the all-clear for the people you can least afford to lose.

The fix is to treat the first quarter as a planned handover with the same seriousness the search got. That means one thing owned and delivered inside the first fortnight: a real decision, a live problem, a mandate the hire can act on without asking permission. It means access arranged before day one. And it means someone credible checking in, off the record, at the points where doubt tends to set: the first escalated decision, and the quiet stretch around day 60 when the honeymoon has worn off and the verdict is forming.

This is unglamorous and easy to defer, which is exactly why it gets skipped. The offer has a deadline and a signature; the 90 days have neither, so they slide. But the arithmetic is plain. A senior re-search costs the fee, the months, and the credibility of the mandate with the market that watched the last person leave. Set against that, the cost of designing the first quarter properly is trivial, and it's the difference between a hire who commits and one who stays just long enough to find the role they thought they'd already taken.