Candidate sourcing: definition, techniques, tools and steps

Candidate sourcing covers all the methods used to identify and attract profiles that match a position, whether or not those people are actively looking for a job. It starts before the job ad is published and ends when the application enters the selection process.

France Travail counts 2.275 million recruitment projects for 2026, 43.8% of which employers expect to be difficult (BMO 2026 survey, published on 21 April 2026). When applications do not come in on their own, the quality of sourcing makes the difference. This guide covers the two approaches to sourcing, the techniques that work, the tools, the steps of a complete sourcing process, how to measure it and its legal limits.

What is candidate sourcing?

Sourcing means finding candidates where they are instead of waiting for them to find the job ad. Recruitment covers the whole journey, from defining the need to onboarding; sourcing is its first step, the one that feeds the process with profiles.

People talk about candidate sourcing, HR sourcing or recruitment sourcing interchangeably. Long reserved for headhunting firms, it is now part of the daily work of in-house teams. According to APEC (Pratiques de recrutement de cadres, 2025 edition, 2024 data), French companies hiring managers and professionals combine several channels: 84% publish a job ad, 76% use their network of contacts, 73% use social media and 66% use direct approach. A third of them use more than five channels.

Active and passive sourcing: two complementary approaches

Active sourcing means seeking out profiles one by one: searching a CV database or a professional network, then contacting people directly. The recruiter chooses exactly who to contact, but each profile costs time.

Passive sourcing means bringing candidates to you: job ads, careers page, unsolicited applications, distribution of the ad across several channels. It produces volume at a low unit cost, but it only reaches people who see the ad and decide to apply.

Do not confuse this with the distinction between active and passive candidates. An active candidate is looking for a job and reads job ads. A passive candidate is employed, is not looking, but could move for a better offer. Traditional passive sourcing mostly reaches the former. To reach the latter, you need either direct approach or distribution that puts the ad in front of them, on the websites and apps they use without thinking about jobs.

Candidate sourcing techniques

Boolean search

Boolean search combines keywords with logical operators to filter a profile database, a professional network or a search engine. The basic operators:

• AND: all terms must appear. technician AND maintenance AND electrical.
• OR: one or the other, useful for synonyms and varied job titles. (sales OR “account manager” OR “business developer”).
• NOT: excludes a term. developer NOT intern.
• Quotation marks: exact phrase. “bank advisor”.
• Brackets: group alternatives before combining them with AND.

A complete query looks like this: (nurse OR RN) AND (“operating room” OR “scrub nurse”) AND Lyon NOT temp. On a search engine, the site: operator limits results to one domain (this is called X-Ray search). Each platform applies these operators in its own way: test the query, read the first ten results, adjust the synonyms.

Social media

Professional networks remain the natural ground for active sourcing: career paths, skills and employers are declared by the candidates themselves. APEC measures that 86% of mid-sized and large companies use social media to recruit managers and professionals, compared with 72% of SMEs. Mainstream social networks serve another purpose: making the company known and showing job ads to people who are not on a professional network that day. The CNIL, the French data protection authority, reminds recruiters not to dig into candidates’ personal social media (see the GDPR section below). To structure this practice, read our article on social sourcing as a daily routine.

Employee referral

Employee referral means asking employees to recommend people from their network, often in exchange for a bonus. It reaches profiles that no job ad reaches, already pre-selected by someone who knows the position and the team. In 2024, 43% of SMEs and 47% of mid-sized and large companies used it to recruit a manager or professional (APEC). In 41% of the latest such hires, the person selected was already known to the company or recommended. Its limit: it reproduces the existing network. A referral programme is managed with written rules and by monitoring the diversity of the profiles recommended.

CV databases

Job sites’ CV databases give access to profiles who have uploaded their CV in order to be contacted. In 2024, 43% of SMEs and 52% of mid-sized and large companies used them for a manager or professional hire (APEC). Two precautions: filter on the date the CV was last updated, because a profile uploaded two years ago has often changed situation, and combine the database filters with a Boolean query so you do not miss unusual job titles.

Targeted distribution to passive profiles

Between the ad that waits and the direct approach that takes time, there is a third way: distributing the ad, as an advertisement, in front of profiles chosen for their professional criteria, on the media they already use. This is the principle of programmatic recruitment. The ad appears on Facebook, Instagram, TikTok, LinkedIn or Snapchat. It also runs on video with YouTube, audio with Spotify, job sites such as Indeed, online press and mobile apps: more than 2 million websites and apps in total.

The point is to reach people who do not visit job sites. On Seeqle campaigns, 80% of the profiles reached are passive profiles, reached through display, audio and social media. Our guide on how to attract passive candidates explains the method.

Internal talent pool

Finalists from a previous recruitment, former interns and work-study students, unsolicited applications and employees seeking internal mobility form a pool that is already partly qualified. It should be checked first, provided the data is up to date and kept within legal limits. An ATS or a candidate CRM lets you find these profiles by skill and by date of last contact.

Which tools should you use to source candidates?

Tools fall into four families, depending on the step they serve:

• Search: search engines, advanced search features of professional networks, job sites’ CV databases.
• Distribution: multiposting tools that send ads to job sites (see our article on job ad multiposting) and programmatic distribution platforms to reach passive profiles.
• Talent pool management: the ATS tracks applications for an open position, the candidate CRM maintains the relationship with profiles over time. Our ATS or CRM comparison helps you choose.
• Pre-qualification: some tools analyse each application received and rank it against the job criteria, so the recruiter starts with the closest profiles. The recruiter keeps the decision.

The right tooling depends on volume. For two manager hires a year, a professional network and a Boolean method are enough. For thirty technician positions, distribution and pre-qualification matter more than profile-by-profile search.

The steps of a sourcing process

1. Frame the need with the hiring manager. Real tasks, essential skills, skills that can be learned on the job, pay, location, remote work. Anything not written down here will come back at the end of the process as a rejection.
2. Define knockout criteria and expected criteria. A regulated degree, a licence, a language or a geographic area are knockout criteria. The rest is weighted. This grid is then used for screening.
3. Draw up the target candidate profile. Where does this person work today, which job titles do they hold, which websites and apps do they use, what would make them move?
4. Choose the channels. Combine at least one active and one passive technique. For a hard-to-fill position, add targeted distribution to passive profiles.
5. Prepare the queries and messages. Boolean queries with job title synonyms, a clear ad that shows the pay, a short and personalised outreach message.
6. Launch, then screen fast. A passive candidate who has replied expects a quick answer. Process applications as they arrive, using the grid defined in step 2.
7. Measure and adjust. After one to two weeks, compare channels on the share of qualified applications and cut those that produce volume without relevance.

Measuring the effectiveness of your sourcing

The number of applications says nothing about the quality of sourcing. Instead, track channel by channel:

• The share of qualified applications: applications that meet the job criteria ÷ applications received.
• The cost per qualified application: cost incurred on the channel ÷ qualified applications. This is what tells you whether a channel is worth its price.
• The reply rate to direct outreach messages and referral requests.
• The interview rate of qualified applications, which checks that your definition of “qualified” is also the hiring manager’s.
• Time to fill and the source channel of each hire.

On Seeqle campaigns, the share of qualified applications is 53% on average. It varies widely from one job to another: compare a position with itself. The formulas, data sources and a ready-to-use dashboard are in our guide to recruitment KPIs.

Sourcing and GDPR: the legal limits

Viewing a profile, saving it in a talent pool or writing to the person is personal data processing. In France, the framework comes down to a few rules.

• Only job-related information. The French Labour Code limits the information sought about a candidate to what has a direct and necessary link with the job offered or the assessment of their abilities (article L. 1221-6). No information may be collected through a method that has not been disclosed to the candidate beforehand (article L. 1221-9).
• Professional networks, not personal ones. In its recruitment guide published in January 2023, the CNIL asks recruiters to avoid looking at candidates’ non-professional social media.
• Inform the profiles you save. A profile merely viewed on a professional network may fall under an exception to individual information. A profile saved in a talent pool must be informed within a reasonable time, no later than one month after it was viewed, according to the CNIL.
• Limit retention. Without the consent of an unsuccessful candidate, the CNIL accepts retention for up to three months after the end of the recruitment. To keep the profile in a talent pool, you need the person’s consent, or failing that you must inform them and give them a simple way to object, and not exceed two years after the last contact.
• Keep the decision human. Article 22 of the GDPR regulates decisions based solely on automated processing. A tool can rank applications; a recruiter decides.

For the use of AI in sourcing and the upcoming obligations of the AI Act, see our page on GDPR and AI Act compliance in recruitment.

Frequently asked questions about candidate sourcing

What is the difference between sourcing and recruitment?

Sourcing is the first step of recruitment: identifying and attracting profiles. Recruitment also includes selection, interviews, the offer and onboarding.

What is the difference between active and passive sourcing?

Active sourcing seeks out profiles one by one and contacts them directly. Passive sourcing brings candidates in through a job ad, a careers page or distribution. Both can be combined for the same position.

How do you source passive candidates?

Through direct approach on professional networks, through employee referral, or through targeted distribution that places the ad on the websites, social networks and apps these profiles already use.

What is a Boolean search in recruitment?

A query that combines keywords with the AND, OR and NOT operators, quotation marks and brackets to filter a profile database. Example: (accountant OR “accounting clerk”) AND Nantes NOT internship.

Is sourcing on social media legal?

Yes, on professional networks and for job-related information. The CNIL asks recruiters to avoid personal networks, to inform saved profiles within one month at most and to limit how long data is kept.

Sourcing passive profiles with Seeqle

Seeqle’s Attract Agent distributes your job ads to profiles chosen from more than 400,000 targeting criteria: on social media, on job sites such as Indeed, then across more than 2 million websites and apps in total. The Match Agent then pre-qualifies each application received with an explained score out of 5; the decision remains human. Find out how Seeqle’s AI sourcing works.