Both models solve the same core problem — filling roles without building a full internal recruiting function from scratch — but they’re built for very different hiring patterns. Picking the wrong one usually shows up as either overpaying for capacity you don’t need, or not having enough support when volume spikes.
What traditional staffing actually is
You engage an agency per role or per batch of roles. They source, screen, and present candidates; you interview and decide. Pricing is per-placement — a bill rate for contract roles, a percentage fee for direct hire. There’s no ongoing retainer; you pay for what you fill.
What RPO (Recruitment Process Outsourcing) actually is
An RPO provider effectively becomes your embedded recruiting function — often managing sourcing, screening, employer branding, and sometimes the full hiring process end-to-end, across many roles simultaneously. Pricing is usually a retainer or per-hire fee structured around ongoing volume, not a one-off transaction per role.
Cost structure comparison
| Traditional Staffing | RPO | |
|---|---|---|
| Pricing model | Per placement (bill rate or % fee) | Retainer or volume-based fee |
| Best for | Occasional or spiky hiring | Consistent, high-volume hiring |
| Cost predictability | Variable, scales with each hire | More fixed, easier to budget |
| Idle cost if hiring slows | None — pay per fill | Retainer often continues regardless |
When traditional staffing wins
- Hiring volume is unpredictable or seasonal
- You need a handful of specific, often specialized roles filled
- You don’t want ongoing retainer commitment
- Hiring needs vary significantly month to month
When RPO wins
- Consistent hiring volume — think 30+ roles/year sustained, not a single spike
- You want a dedicated team that deeply learns your employer brand, hiring managers, and process over time
- You’re scaling fast and need recruiting infrastructure built quickly without hiring an internal team
- You want end-to-end process ownership, not just candidate sourcing
The middle ground: project-based or hybrid RPO
Some providers offer project RPO — full RPO-style embedded support, but scoped to a defined hiring surge (a new office launch, a product line expansion) rather than an ongoing retainer. This can combine RPO’s depth of process with traditional staffing’s lower commitment, and is worth asking about if your volume is high but temporary.
The decision in practice
The honest litmus test: if you’re filling the same handful of roles repeatedly through traditional staffing every quarter, you’re probably paying a volume premium that RPO’s flatter cost structure would beat. If your hiring need is genuinely occasional or unpredictable, RPO’s retainer becomes dead weight you’re carrying for capacity you’re not using.
Not sure whether your hiring volume justifies RPO or is better served by per-role staffing? Talk to Scadea — we’ll help you run the numbers against your actual hiring calendar.