What is the difference between RPO and MSP?

What does a recruitment process outsourcing (RPO) provider do?

A recruitment process outsourcing (RPO) provider manages full or partial permanent recruitment processes for organisations, acting as an external provider embedded in the client business and integrated with the client's talent acquisition team. The provider supports sourcing candidates directly through its own talent acquisition infrastructure, databases, and sourcing channels rather than relying on third-party staffing agencies.

A full RPO engagement covers 7 core activities:

• Workforce planning and job design
• Candidate sourcing, including passive candidates
• Screening resumes
• Conducting interviews
• Offer management
• Onboarding
• Employer branding

Research from Hudson RPO shows that RPOs improve hiring quality and reduce time to hire for permanent roles by over 40%, while butting hiring costs by up to 50% in year one. The RPO Association found that 67% of companies using RPO services saw revenue increases, compared to 33% that did not.

Modern RPO solutions use applicant tracking systems, technological advancements, AI, and advanced analytics to improve the hiring process.

For engineering and energy firms, RPO is most valuable for permanent technical hiring where deep sector knowlesge, specialist talent networks, and consistent canddiate experience help secure the best candidates. A RPO partner provides all three. 

When your organisation needs RPO

RPO is the right model when workforce goals and hiring gaps point to a need for support in permanent roles or permanent positions:

• Permanent positions exceed internal capacity - more than 20 hires per quarter is a common threshold
• Time-to-hire for technical roles exceeds 60 days and is delaying project delivery
• Employer brand is inconsistent across hiring channels, reducing candidate quality and making it harder to attract top talent
• Internal recruitment technology or expertise is insufficient for structured hiring at scale

What does a managed service provider (MSP) do?

A managed service provider (MSP) is a third-party provider overseeing your organisation's contingent workforce as the single point of control for workforce management across temporary staff and the non-permanent workforce. It manages supplier management, supplier relationships, negotiating contracts, compliance oversight and invoice consolidation to reduce administrative burden, improve access to contingent talent and support strategic workforce planning.

At the centre of MSO solutions is a Vendor Management System (VMS), and MSPs oversee it to provide visibility into contingent workforce spending and performance, alongside worker classifications and compliance status. 

A well-run managed services program delivers five measurable outcomes:

• Up to 20% reduction in agency spend through streamlined supplier relationships and performance management
• Real-time visibility over contingent workforce costs and headcount
• Reduced risk across complex employment laws and global compliance requirements
• Single point invoice management replacing multiple billing cycles
• Scalable contingent access that ramps up or down with project demand

When you organisation needs a MSP

A MSP is the right model when you need better management of a non-permanent workforce, along with more control over supplier relationships and spend visibility. 

• Contingent workers make up more than 20% of your total workforce
• Five or more staffing suppliers are operating without centralised oversight, creating extra administrative burden
• Total contingent spend cannot be reported accurately in real time
• Worker misclassification or compliance breaches are a current or recognised risk
• Project teams need to mobilise at speed without adding permanent headcount

Which model does your organisation need?

Choose between MSP and RPO based on your workforce goals and gaps. Choose RPO when the primary challenge is the quality, speed, or volume of permanent hiring, and choose a MSP when the challenge is controlling cost, compliance, and complexity across a contingent workforce. In practice, MSP supports contingent staffing, while RPO if focused on the permanent workforce. Many engineering and energy organisations need both, and some use hybrid models that utilise both MSP and RPO solutions rather than running separate disconnected programs.

Can you use RPO and MSP at the same time?

Yes. When MSP and RPO solutions are intgrated, the result is a single view of permanent and contingent headcount, cost, and compliance with shared data flowing between the ATS and VMS, and workforce planning aligned across both hiring types. 

This broader approach is often described as total talent management, bringing permanent and contingent hiring oversight into one model. In harder-to-fill flexible hiring scenarios, contingent RPO can help, and contingent RPO combines elements of the contingent MSP model and RPO to support scaling specialist demand.

TRS Workforce SOlutions delivers this through ONEMSP, a project-specific solution that manages all contingent resource needs within a unified program. Unlike a standard MSP designed for ongoing organisational programs, ONEMSP operates at project speed: aligning the full agency supply chain, real-time reporting, and workforce governance directly to project milestones. It is operational within weeks, with a dedicated program lead as a single point of contact throughout.

For an energy firm managing a refinery turnaround or an infrastructure contractor mobilising for a major civil works program, the difference between an ongoing MSP and a project-calibrated one is significant.

How do RPO and MSP differ in cost?

RPO providers use three pricing models: a per-hire fee for each successful placement, a monthly management fee for an embedded recruitment team, or a blended combination of both. MSP pricing is a percentage of total contingent spend managed through the program, typically 2–5%. A well-run MSP returns more than its fee: agency spend reductions of up to 20% are standard through rate benchmarking and supplier consolidation.

Why TRS Workforce Solutions?