Every recruiter knows thedrill: a new vacancy comes in, and the first move is to post a job ad.Meanwhile, your ATS is sitting on hundreds, sometimes thousands, ofcandidates you already know.
Your candidate database isn’t an archive. It’s an untapped asset.
Staffing and recruitment agencies have a competitive advantage that in-house recruiters simply don’t: a rich database of candidates they’ve already spoken to, assessed, and screened. People with names, motivations, and track records. Yet in practice, that advantage is rarely used. Once a placement is made, the remaining candidates fade into the background of the system. Not because they’re not valuable but because there’s no easy way to know whether they’re available right now. And the market doesn’t wait.
85% of your candidates haven’t heard from you in over a year
Research by Bullhorn shows that on average, more than 85% of candidates in an ATS have had no contact with their agency in the past twelve months. Let that sink in. Those candidates didn’t disappear. They didn’t find a better agency. They simply were never contacted again. Someone who wasn’t available six months ago might be actively looking right now. Someone who had just started a new role back then might already be ready for their next move. But you don’t know because you never asked. In sectors like healthcare, engineering, and IT where talent shortages are structural and clients wait months for the right hire this is a missed opportunity agencies can no longer afford.
Posting on the same overcrowded job boards: expensive and inefficient
The reflex response to a new vacancy is still the same: post a job, advertise on job boards, and wait for applications. That costs time and money and in tight markets, it usually surfaces the same limited pool of candidates already on five other agencies’ radars. The problem isn’t a lack of candidates. The problem is that agencies keep searching for people they already know. Reactivating dormant candidates isn’t just smarter, it’s significantly more cost-effective than running new recruitment marketing campaigns. Agencies that leverage their existing database pay a fraction of what a new hire costs through traditional sourcing channels.
Selection Lab’s reactivation tool: from dormant database to qualified conversation in two minutes
Selection Lab, a Dutch recruitment technology scale-up, has built a direct solution to this problem: the candidate reactivation tool. Here’s how it works:
1. Upload a list of candidates from your existing ATS or system
2. Select an automated flow tailored to the role or candidate segment
3. Send personalized messages via WhatsApp or Webchat, within minutes
The candidate receives a friendly, conversational message and completes a short automated questionnaire covering availability, preferences, and expectations. If they meet the criteria, they’re automatically scheduled for a call with the right recruiter. The entire process takes two minutes for the candidate and requires zero manual effort from the recruiter. If a candidate doesn’t meet the criteria, the tool closes the conversation in a polite and professional way. No awkward silence. No false expectations.
Why WhatsApp?
WhatsApp is the most widely usedmessaging platform across Europe. Open rates are structurally higher thanemail, and the barrier to reply is low. Candidates respond faster, more often,and more authentically to a WhatsApp message than to a formal email or joblink.
For recruiters, that means moreresponses, better data, and faster decisions.
Part of a proven recruitment platform
The reactivation tool isn’t a standalone product it’s part of Selection Lab’s broader platform, already used by organizations including Carrefour, KPN, RGF Staffing, TMI, and Aethon.
The platform provides a single integrated environment for all types of assessments: scientifically validated, available for both white- and blue-collar roles, ranging from traditional to interactive and game-based formats. It integrates directly with existing ATS systems and is complemented by conversational AI that supports recruiters where and when it matters most.
In 2025, Selection Lab won the Global People’s Choice Award at the KPMG Global Tech Innovator Competition at Web Summit in Lisbon.
The question every recruitment manager should ask
How many candidates are sitting in your ATS right now that you haven’t contacted in the past year? And how many of them are currently open to a new opportunity, while you haven’t even asked?
Reactivating dormant candidates isn’t a technical challenge. It’s about using the right tool at the right moment.
➤ Want to see how the reactivation tool works for your agency?Book a free demo with Selection Lab.
