A Key Employee Just Resigned. How Do You Replace Them Before Their Notice Period Ends?

The Notice Period Is Shorter Than Your Hiring Process

In France, the law does not set the length of a resignation notice period. As service-public.gouv.fr explains, it is most often fixed by the applicable collective agreement, otherwise by the employment contract, otherwise by local or professional custom. In practice, it is often around one month for non-managerial staff and up to three months for managers. Check your own collective agreement before you build a plan on a guess.

Now compare that with how long hiring takes. In its 2022 study of managerial recruitment practices, Apec found that the average duration of a company’s most recent managerial hire reached 11 weeks in 2021, up from 9 weeks in 2020, and that three to six months is common for IT and R&D roles. And the clock does not stop at the signed offer: the person you hire usually has a notice period of their own to serve.

Add the three rows and the conclusion is uncomfortable but useful: for most roles, there will be a gap. The goal is not to avoid it. The goal is to use the notice period for the two things only it allows, capturing what the leaver knows and defining the job properly, and to decide in advance who covers the gap.

Why Reposting the Old Job Ad Is the Default Mistake

Reposting the old ad feels like the fastest move, and under time pressure speed wins. The problem is that in a small company, a job drifts away from its description within months. The person you hired two or three years ago did not do the job you advertised. They did the job that grew around them. By the time they resign, the role usually differs from the ad in three ways:

• Tasks they absorbed. Supplier follow-up, a monthly report, the tool nobody else knows how to configure. None of it is in the ad, and some of it is critical.
• Tasks that disappeared. Parts of the original job were automated, handed to someone else or simply stopped. Hiring for them again means paying for work that no longer exists.
• Knowledge that only lives in their head. The client who needs a call rather than an email, the workaround in the invoicing process, the reason a supplier was dropped. It leaves on their last day unless someone writes it down.

The opposite trap is just as common: looking for a copy of the person. You describe the leaver’s personality and history instead of the outcomes the role must deliver, and you end up comparing every candidate with someone who had three years of context. Nobody wins that comparison. If you have never written a job description from scratch, our guide to writing a job description when you have never hired walks through starting from the mandate rather than the title.

Use the First Week to Map the Real Job

The person leaving is your best source on what the job really is, and they are only available for a few weeks. Ask them, in the first days of their notice, to list everything they do in a typical month, including the small recurring tasks. Then sort the list together into three columns: what the new hire must take over, what can be redistributed inside the team, and what can stop.

A worked example

Take an illustrative case. In a 60-person distribution company, the operations coordinator hired three years ago resigns with one month’s notice. The founder’s first instinct is to repost the original ad, which listed order tracking and carrier relations. The task inventory tells a different story: 22 recurring tasks, of which 9 are the core of the role, 7 could move to two colleagues, and 6 no longer need doing since the company changed software last year. Two of the core tasks, a monthly margin report and the setup of the warehouse tool, appear nowhere in the old ad. Those two become the deciding criteria for the new hire, and the profile the founder now looks for is not the one they would have reposted.

These figures are illustrative; your own split will differ. What matters is that the exercise takes a few hours and turns a resignation into a clear brief. It also tells you whether you are replacing the role at all. Sometimes the honest answer is a narrower role, or a different one.

Run the Search and the Handover in Parallel

With a one-month notice, the search and the handover cannot happen one after the other. A simple four-week plan keeps both moving:

• Week 1: decide and publish. Run the task inventory, write the new brief from it, and publish the ad before the end of the week. Reach out to the candidates you liked in your last search for a similar role.
• Week 2: screen and document. Screen applications against the criteria from the brief. In parallel, the leaver writes down the procedures behind the core tasks, starting with the ones nobody else can do.
• Week 3: interview with real work. Use a short exercise built from one of the core tasks. The leaver can help design it and explain what a good answer looks like, but the decision stays yours.
• Week 4: offer and handover file. Make the offer, then make sure the handover file, the access to tools and the key contacts are in place before the last day, not after it.

Week 1 is where most time is lost or saved. Candidates you almost hired last time are the fastest pool you have, and keeping them is cheaper than finding new ones, which is why we wrote about keeping a pool of runner-up candidates.

Decide Who Covers the Gap

Even with a good plan, the seat is likely to be empty for some weeks. Left undecided, the gap gets covered by default, which in a small company means by the founder, in the evening. It is better to choose:

• Redistribute on purpose. Give the redistributable tasks to named colleagues, with an end date, rather than letting them pile up on whoever is nearest.
• Bring in temporary help for the core. A freelancer or temp for the few tasks that cannot wait is often cheaper than what the empty seat costs.
• Freeze what can wait. Say out loud which projects pause until the new hire is in place. A visible pause is easier on the team than an invisible overload.

If you want to put a number on the weeks without anyone in the role, our article on the cost of an unfilled role shows how to estimate it.

This is also where the tooling question shows up. A resignation compresses a whole search into a few weeks, at a moment when you are also covering the work. Kynto brings that search into one place: a job description generated from your brief in one click, sourcing across 600 million profiles, CV screening and scoring against your criteria, and interview scheduling handled for you. You can see how it works for founders hiring without an HR team.

Key Takeaways

• A notice period is usually shorter than a hiring process, and the new hire often has a notice of their own. Plan for a gap instead of hoping to avoid it.
• Do not repost the old job ad. Map the real job with the person leaving, and sort it into what to hire for, what to redistribute and what to stop.
• Run the search and the handover in parallel from week one, and decide who covers each part of the work until the new person starts.

FAQ

Can I ask the employee to stay longer than their notice period?

You can ask, but you cannot impose it. Any extension has to be agreed by both sides and is best put in writing. The reverse also happens: the employee may ask to leave before the end of their notice, and it is up to you to accept or refuse. Before answering, look at how much of the handover is done.

Should the person leaving interview their replacement?

Involve them in describing the work and in designing a practical exercise, because they know the job better than anyone. Keep the decision with you. Someone on their way out tends to look for a person like them, which is the copy trap in another form.

Is a resignation a good moment to change the role?

Often, yes. It is one of the few moments when you can redraw a job without taking anything away from anyone. If the task inventory shows that part of the role has disappeared or drifted, hire for the job you need next year, not the one you needed three years ago.