A consultant's view of why some engineering searches fly, and others stall from the team at Platform Recruitment.
After over fifteen years of placing engineers across the UK, US and Germany, we've noticed something: the briefs that lead to great hires almost always look different from the briefs that don't.
It's rarely about the role itself. We've placed engineers into the most ambiguous, hard-to-define positions you can imagine and watched them thrive. We've also seen crystal-clear, well-funded, well-located roles drag on for months because the brief at the start sent everyone in slightly the wrong direction.
The pattern, we've learned, is that the brief doesn't just describe the search, it shapes it. A vague brief produces a vague shortlist. A slow process loses strong candidates. And a brief that doesn't reflect what the team actually needs produces hires who underperform six months in.
None of this is about hiring managers doing anything wrong. Most of these patterns come from being busy, inheriting a job description from the last time the role was open, or genuinely caring about getting it right and over-engineering the spec as a result. They're entirely human.
But because we sit between hundreds of hiring managers and thousands of candidates every year, we get to see the patterns more clearly than any single team would. So in the spirit of being useful and saving you the long version of this conversation on a future job spec call - here are seven of the most common briefing mistakes we see, and how to fix them.
1. Treating the job spec call as a quick formality
The single biggest predictor of how a search will go is how well the first conversation lands. When a hiring manager blocks a focused 45 minutes to walk us through the role, the team, the codebase and the wider context, things tend to move quickly. When the call gets squeezed into a 15-minute window between meetings, or skipped in favour of "I'll send you the JD", the search almost always takes longer.
It's not that we can't work from a written job description. We can. But a JD tells us what the role is on paper; the conversation tells us what the role actually is. Things like: which two skills on the spec are non-negotiable and which are nice-to-haves, what's gone wrong in this role before, what the engineer who left was great at, what the team is genuinely like to work in.
The fix: Treat the briefing call as the most important meeting of the search, not a tickbox before the work begins. A well-run 45-minute conversation typically saves three weeks of misaligned shortlisting.
2. Giving us a job description without telling us what success looks like
Most job specs we receive describe responsibilities ("you'll work on the backend platform", "you'll mentor junior engineers"). Very few describe outcomes ("in six months, this person will have replaced our payments service", "by the end of year one, the team will be deploying twice as often").
The difference matters because skills and outcomes aren't the same thing. Two engineers with identical CVs can perform completely differently in the same role depending on what they're actually expected to deliver. When we know what success looks like, we can screen against that, not just against keywords.
This connects directly to a recurring theme in the structured interview research: the most predictive interviews are designed around what someone needs to do, not what they need to know.
The fix - Before your next briefing call, answer four questions in writing:
- What does success look like at six months?
- What would make us regret hiring this person?
- What can they learn on the job?
- What do they need on day one?
Send us those, and the entire search sharpens.
3. Being slow to feed back on shortlists
This one's the source of more lost hires than any other on this list and it's the easiest to fix.
The mid-level software engineering market in 2026 moves fast. A strong candidate is typically in two or three live processes at once, and for every extra day a hiring manager takes to review CVs or come back with interview feedback, the probability of closing that candidate drops noticeably. We've watched genuinely brilliant engineers slip away from clients we love working with, simply because feedback that should have taken 48 hours took ten days.
We know why this happens. Hiring managers are busy. CVs sit in inboxes. A single Slack notification gets in the way of a 20-minute review session that's been pushed twice.
The fix: Block 30 minutes in your calendar within 48 hours of receiving any shortlist, and another 30 minutes within 24 hours of every interview stage. That single calendar habit will do more for your hiring outcomes than almost any other change.
4. Treating the recruiter as a service rather than a partner
This is the mindset shift that separates clients who consistently hire well from clients who consistently struggle.
A transactional relationship looks like this: client sends a JD, recruiter sends CVs, client responds when they get round to it, repeat until the role is filled or one party gives up. The recruiter has limited insight into the team's real priorities. The client doesn't fully trust the recruiter's read on the market. Both sides are guarded.
A partnership looks different. The hiring manager shares context; what's working in the team, what's not, what a recent leaver was great at, how the technical roadmap is shifting. The recruiter shares back; what the market's actually paying, where the brief might be unrealistic, who's been on the market recently and why. Both sides invest time up-front because they trust the relationship will compound.
The work involved isn't actually more - it's just front-loaded. And the results are dramatically different.
The fix: If you're working with the same recruiter for more than one role, invest in the relationship like you would any business partnership. A 30-minute monthly catch-up, even when nothing's actively open, pays back many times over the next time you need to hire urgently.
5. Filtering for the "perfect" CV instead of the right hire
We see this most often in roles where a hiring manager has been burnt by a previous bad hire. The instinct is to add more criteria to the next spec; more years of experience, more specific stack matches, more "must-haves", in the hope that a tighter filter will produce a safer hire.
It rarely does. Tighter filters mostly just shrink the pool. The engineers who tick every box on a 14-point checklist are usually either unavailable, expensive, or counterintuitively, not actually the strongest performers. The best engineers we place often have one or two gaps against the original spec, balanced by a strength the spec didn't think to ask for.
The fix: Separate must-haves from nice-to-haves explicitly. A useful test: if you had two weeks to fill the role and could only screen against three criteria, which three would you pick? Those are your real must-haves. Everything else is preference, important, but not disqualifying.
6. Letting unconscious bias narrow the shortlist
This one's harder to talk about, but it's the source of more missed hires than most teams realise.
We see it most often as small, well-meaning instincts that quietly compound. A CV gets passed over because the candidate's name is hard to pronounce. A returner from career break is dismissed for "rust" without an interview. A candidate's body language in a video call is read as lack of confidence, when it might be unfamiliarity with the format. None of these are conscious decisions to discriminate. But they all narrow the pool.
The cost isn't only ethical (though it is that). It's also commercial. The companies winning the hiring race in 2026 are the ones taking the broadest possible view of what good looks like; and the companies losing it are the ones repeatedly hiring people who look, sound and think like the team that's already there. Homogeneous teams are easier to hire into and harder to grow. Diverse teams are harder to hire into and produce stronger work over time.
The fix: Two practical changes that consistently work. First, agree your scoring rubric before you see the shortlist, and score against it — not against your gut feeling about each candidate. Second, when you find yourself ruling someone out, ask whether the reason would still apply if the rest of the CV looked the same but the candidate's name, gender or background were different. Often it wouldn't.
7. Going quiet between roles
Most of our best hires come from clients we've worked with for years. Not because we have a special database for repeat clients (we don't), but because the longer we work together, the more accurately we can predict what a team needs and the faster we can move when an urgent role opens.
The clients who get the most value from us are the ones who stay in light contact between hires. A two-line email when the team's strategy shifts. A heads-up when someone hands in their notice. A coffee every six months. None of this takes much time. All of it pays off the next time something urgent happens.
The clients who only call when they're desperate get the version of us that's working from a cold start every time. We're still good at it, sixteen years of doing this means we can move fast when we have to, but we're nothing like as accurate as we could be if we'd been part of the conversation all along.
The fix: Stay in touch between roles. Even a five-minute message every couple of months keeps the partnership warm and dramatically improves response times when you need to hire urgently.
If a thread runs through all seven of these, it's that good hiring is a slow investment that pays back fast. The work that goes into a clear brief, an honest conversation, a quick feedback loop and a real partnership feels like overhead, until you compare your time-to-hire and quality-of-hire numbers against teams who skip it.
Most of these mistakes come from genuinely caring about getting the hire right. The good news is that the fixes are all small, behavioural, and entirely within your control.
Hiring software or hardware engineers this quarter?
Platform Recruitment places engineers into scale-ups and established tech teams across UK, USA and Germany. Whether you've got a brief ready to go or you're still scoping the role, we'd love to be the second pair of eyes that helps you get it right before you start interviewing.
Send us a brief here and we'll come back to you within 24 hours with a shortlist plan and a current read on the market.
Scam Alert