Why Senior Engineers Quit in Year One (and How Firms Keep Them)

Why engineers quit in their first year is a question I get from firm owners more than almost any other. You spend months finding a senior engineer, a project director or a VP of Engineering. You pay the fee, wait out their notice period and introduce them to your clients. Then, nine months in, they hand in their notice. This report looks at why that happens, what the research says, and what you can do about it before and after the offer.

Key findings

• Most failed hires are not about skill. In Leadership IQ’s study of more than 20,000 new hires, 46% failed within 18 months, and 89% of those failures came down to attitude (coachability, emotional intelligence, motivation and temperament). Technical competence accounted for only 11%. (Leadership IQ)
• The warning signs are usually there. 82% of hiring managers in the same study said that, looking back, the interviews gave subtle clues the hire would fail.
• Onboarding is weak almost everywhere. Only 12% of U.S. employees say their company does a good job of onboarding, and only 29% of new hires feel fully prepared and supported to excel after it. (Gallup)
• Most early exits can be prevented. 52% of people who leave voluntarily say their manager or organization could have done something to keep them, and 51% say nobody spoke to them about their job satisfaction or future in the three months before they left. (Gallup)
• Year one is a big group. In January 2026, 20.6% of U.S. wage and salary workers had been with their employer for a year or less. (U.S. Bureau of Labor Statistics)

Why it costs so much when a senior engineer leaves early

Gallup puts the cost of replacing an employee at between one-half and two times their annual salary, and calls that a conservative estimate (Gallup). For a senior engineering leader, the salary is only part of it. You lose a project lead in the middle of delivery, a client relationship that was just getting started, and the time your other leaders spent bringing them up to speed. Gallup also notes that new employees typically take around 12 months to reach their peak performance. A senior hire who leaves at month nine has cost you the ramp-up and never paid it back.

Why engineers quit in year one: 7 reasons

From the searches we run and the conversations we have with candidates who are thinking of leaving a new job, the same reasons come up again and again. Money is rarely at the top.

1. The job was not the job they were sold

This is the most common one. The role was described as building a new region, and it turns out to be fixing a troubled project. Or the “VP of Engineering” title comes with no budget and no say in hiring. Gallup describes onboarding as “fulfilling the promises you made during recruitment.” When the promises were vague or too optimistic, the new hire finds out fast, and senior people do not stay long in a role they feel misled about.

2. They did not get the authority they expected

Senior engineers move to make decisions. If the founder still signs off every hire, every bid and every change order, the new leader is a highly paid adviser. That frustration builds quietly for six months and then turns into a resignation.

3. They clashed with how the firm really makes decisions

Every firm has its own way of working. Some move fast and argue it out. Others build consensus and take their time. A leader who thrived in one will struggle in the other. Leadership IQ found temperament, meaning an attitude and personality suited to the job and environment, behind 15% of failed hires, and emotional intelligence behind 23% (Leadership IQ). Fit with how decisions get made matters as much as fit with the work.

4. The firm hired for technical skill and stopped there

Engineering interviews are good at testing technical ability. Licenses, project size and technical depth are easy to check. But in the Leadership IQ data, technical competence explained just 11% of failed hires. Coachability (26%) and motivation (17%) mattered more. A brilliant engineer who will not take feedback from the managing partner is still a bad hire.

5. They were left to figure it out alone

Many firms treat a senior hire as someone who does not need onboarding. They get a laptop, a team introduction and a full calendar. Gallup found that when the manager takes an active part in onboarding, employees are 3.4 times as likely to say it was successful (Gallup). Senior people need that too, maybe more, because they are expected to deliver results sooner.

6. Nobody asked how it was going

This one is the easiest to fix. In Gallup’s research, 51% of people who left said no manager or leader had talked to them about their satisfaction or future in the three months before they went (Gallup). Senior hires rarely complain out loud. If you do not ask, the first sign of trouble is often a resignation letter.

7. The move did not work for their family

Relocation is a big part of senior engineering hiring. If the spouse has not found work, the kids are unhappy at school or the commute is worse than expected, even a great job can lose. These issues are rarely raised at interview, so they are rarely planned for.

Warning signs to watch for during hiring

Leadership IQ found that 82% of hiring managers saw clues in the interview that the hire would fail, but were too busy, too pressed for time or not confident enough to act on them. The signs they listed include negative language, arrogant answers, generalities instead of specifics, absolute words like “always” and “never,” and putting down former colleagues (Leadership IQ). From our own searches, I would add these:

• The candidate cannot tell you clearly why they want this role, only why they want to leave their current one.
• Their story of a past project is all “I” and never “we,” or never mentions a mistake.
• They have not asked who they will report to, what authority they will have or how decisions get made.
• Their family has not been part of the relocation conversation.
• Your own interviewers describe the role differently from each other.
• A short stint on the resume has an answer that does not quite add up.

What firm owners can do: a practical checklist

None of this needs a big HR budget. It needs discipline at a few key points.

Before the offer

• Write down what the role must deliver in the first 12 months, and get every decision maker to agree to it.
• Be honest about the hard parts: the difficult client, the weak team, the founder who still wants a say.
• Spell out the authority: budget, hiring, sign-off limits.
• Test how the candidate leads and takes feedback, not just what they know.
• Take references from people who actually worked with them, including someone who reported to them.
• Talk about relocation and family early, not after the offer.

In the first 90 days

• Give them a named person to go to for “how things really work here.”
• Have the owner or CEO meet them every week for the first month.
• Introduce them to key clients in person, with you in the room.
• Agree two or three early wins they can deliver.

Through month 12

• Hold a proper check-in at 30, 90, 180 and 270 days. Ask what is different from what they expected.
• Fix the gaps you hear about. Asking and doing nothing is worse than not asking.
• Check in on the family side if they relocated.

How AES approaches it

We built our process around the reasons above. Before you meet anyone, every shortlisted candidate goes through RoleDNA™ Mapping. It looks at how a candidate leads, makes decisions and handles pressure, alongside their technical record, so you can see whether they will fit the way your firm really works and whether they are likely to stay.

The numbers back this up. 96% of our placements are still in role at 12 months, and 98% of our searches end with a placement. Every hire comes with a 12-month free replacement guarantee, or 2 years for senior roles. You can read more about how we work with firms on our For Clients page, and what a search involves and costs in our guide to engineering executive search. If pay is part of the picture, our engineering leadership salary report shows what senior engineers earn right now.

“They completely changed my impression of recruiters. Alexander Executive Search is a true partner in a space where that word is often overused.”

Kathy Fuller, VP of Administration, Earthcore

FAQ

Why do engineers quit in their first year?

Most often because the role was not what they were told, they lacked the authority they expected, or they clashed with how the firm makes decisions. Research from Leadership IQ found attitude, not technical skill, behind 89% of failed hires.

How many new hires fail?

Leadership IQ found that 46% of new hires failed within 18 months, and only 19% were clear high performers.

Is money the main reason senior engineers leave?

Rarely on its own. Pay matters at the offer stage, but early exits usually come from role, authority, culture or family issues that were not dealt with during hiring.

How long does it take a senior hire to reach full performance?

Gallup’s experience suggests new employees typically take around 12 months to reach their peak performance, which is why losing someone in year one is so expensive.

What can I do to keep a new senior engineer?

Be honest about the role, define their authority, take part in their onboarding yourself and check in regularly through the first year. Gallup found that 52% of people who leave voluntarily say it could have been prevented.

Talk to us about your next senior hire

If you have lost a senior engineer early, or you have a key hire coming up and want it to last, let’s talk. Book a meeting at a time that suits you, or contact us here.