There’s a moment in almost every hiring process where people relax.

The interviews are done, the preferred candidate has accepted and the signed offer letter lands in the inbox. Internally, the role gets marked as filled and attention moves back to operations, projects and the next urgent problem.

But in reality, the hiring process is not finished at that point. In many cases, the most fragile part of the process has only just started.

In STEM industries especially, the period between offer acceptance and day one is where good hires are often lost. Not because the salary suddenly becomes uncompetitive, but because uncertainty starts to creep in. Communication slows down, momentum disappears and candidates begin questioning whether they’ve made the right decision.

This is something we see regularly across chemicals, manufacturing and life sciences. A business can run an excellent interview process over several weeks, create genuine excitement around the role and build strong relationships throughout the process, only to go completely quiet once the paperwork is signed.

From the employer’s perspective, that silence is rarely intentional. Managers are busy, HR teams move onto onboarding administration and production pressures take priority again. But from the candidate’s perspective, the experience can feel very different.

They are still sitting in their current workplace every day. They are still having conversations with colleagues and managers. In many cases, they are now receiving attention from their employer that they have not had in years.

Counteroffers are part of this, but they are not usually the main issue.

Most candidates do not withdraw because another business adds a little more money to the table. They pull back because doubt starts to build. They worry about culture fit. They question whether the new environment will suit them. They wonder if they are making a mistake leaving a team, site or laboratory they have spent years in.

That is particularly true in process industries where career moves are rarely impulsive decisions. Engineers and scientists tend to think carefully about risk, stability and long-term progression. They are not only assessing salary packages. They are assessing leadership quality, technical standards, operational culture and whether they can genuinely see themselves succeeding in the environment.

That evaluation continues long after the contract is signed.

The strongest employers understand this and stay engaged throughout the notice period. Not in an over-engineered or corporate way, but through simple consistent communication.

Sometimes it is a quick call from the hiring manager every week or two. Sometimes it is an informal coffee with the future team. Sometimes it is sharing context around upcoming projects or explaining what the first few months in the role will actually look like.

These things matter more than many businesses realise.

A candidate who already feels part of the team before day one will usually arrive more confident, more engaged and more certain they made the right move. A candidate left in silence often arrives carrying uncertainty into the role from the beginning.

The onboarding process does not start on someone’s first morning. It starts the moment they accept the offer.

Every interaction after that point shapes their perception of the business. It influences how connected they feel, how quickly they settle in and, ultimately, how likely they are to stay long term.

In a market where experienced STEM talent is difficult to attract and even harder to retain, this part of the process deserves far more attention than it often gets.

An accepted offer is an important milestone, but it is not the finishing line.

It is the point where trust still needs to be reinforced and where good hiring processes separate themselves from average ones.