External Recruitment

External sources of recruitment

The main channels, roughly in the order high-volume employers rely on them:

• Job boards and aggregators, paid or organic, usually the largest source of applicants for hourly roles
• Career site and direct applications
• Employee referrals, where the candidate is external but the lead comes from inside
• Proactive [candidate sourcing](/glossary/candidate-sourcing/) of passive talent through databases and networks
• Social media and messaging ads
• Hiring events and walk-in days
• Campus and early-career programs
• [Staffing agencies](/glossary/staffing-agency/) and recruitment process outsourcing for volume, speed or hard-to-fill roles
• Former employees and past applicants, sometimes counted as a separate rediscovery source

Track source of hire for every channel. The cheapest channel per applicant is often not the cheapest per hire once screening and early turnover are counted.

External vs internal recruitment

Internal recruitment fills roles through promotions, transfers and internal job postings. The trade-offs:

• Cost: external hires cost more, through advertising, agency fees and recruiter time. Internal moves still cost something, mainly the backfill.
• Speed to productivity: internal hires already know the systems and culture. External hires take longer to ramp.
• New capability: external hiring is how you bring in skills nobody in the company has, and how you grow headcount at all.
• Morale: filling every senior role externally tells employees there's no path up. Filling every role internally can make a team insular.

Most organizations use both: internal first for roles with a clear internal bench, external for entry-level volume, new capabilities and growth.

Worked example

A logistics company is opening a new distribution center and needs 180 hourly associates, 12 shift leads and one general manager. It fills 6 of the shift leads and the GM through internal transfers from existing sites, since they bring know-how about the operation. The other 6 leads and all 180 associates come from external recruitment: job board campaigns, two hiring events, a referral bonus and a staffing agency for the first month's surge. Roughly 95% of the hires are external, which is typical for a new site.

Common mistakes

• Posting externally before telling employees about an opening they'd want
• Relying on one channel, which makes the funnel fragile when that channel's traffic dips
• Comparing channels on cost per applicant instead of cost per hire and 90-day retention
• Leaving out the onboarding difference: external hires need more ramp-up time, and that should be in the plan