Staff Augmentation Agencies in California

132 staff augmentation agencies are listed in California. 118 have been assessed on the Agency List Score as of October 2026; the highest-ranked is Ad Club at 96.8.

Ranked · 61 of 118 assessed

Ordered by Agency List Score
#1 of 118 assessed
Ad Club
97

Recruitment and PERM immigration advertising with vendor management and print design services

Back Office ServicesCustomer Support BPOData Entry and Annotation
#2 of 118 assessed
Creative Media Partners
97

Media planning, buying, and creative production across TV, radio, print, and events

Back Office ServicesCustomer Support BPOData Entry and Annotation
#3 of 118 assessed
BairesDev
96

Nearshore software development and staff augmentation services

Back Office ServicesCustomer Support BPOData Entry and Annotation
#4 of 118 assessed
HRtoGO
95

Simplifies HR, payroll, and benefits for businesses.

Back Office ServicesCustomer Support BPOData Entry and Annotation
#5 of 118 assessed
Boldium
95

Creates brands, products, and campaigns that ignite change

Back Office ServicesCustomer Support BPOData Entry and Annotation
#6 of 118 assessed
King
94

Development and dev services for inbound lead capture and search visibility

Back Office ServicesCustomer Support BPOData Entry and Annotation
#7 of 118 assessed
Alpineinvestors
92

SEO and PPC services for inbound lead capture and search visibility

Back Office ServicesCustomer Support BPOData Entry and Annotation
#8 of 118 assessed
Tiny Rebellion
91

Creating enduring brands for visionaries and disruptive companies

Back Office ServicesCustomer Support BPOData Entry and Annotation
#9 of 118 assessed
Zventus
79

Strategic workforce solutions for lending, insurance, and healthcare industries

Staff Augmentation
#10 of 118 assessed
Proven Recruiting
78

Recruiting for finance, technology, and life sciences sectors

Project StaffingStaff Augmentation
#11 of 118 assessed
Kenz Innovation HCM
78
Verified

Unified HCM platform for HR, payroll, and benefits management

Back Office ServicesCustomer Support BPOData Entry and Annotation
#12 of 118 assessed
Magnopus
75

Creating immersive experiences across physical and digital worlds

Back Office ServicesCustomer Support BPOData Entry and Annotation
#13 of 118 assessed
Bulldog Drummond
74

Transforms brands through innovation and design expertise.

Back Office ServicesCustomer Support BPOData Entry and Annotation
#14 of 118 assessed
SDI Staffing
74

Specialized insurance staffing and recruiting since 1995

Project StaffingRecruit Train DeployStaff Augmentation
#15 of 118 assessed
Bolt Staffing
74

Staffing solutions for administrative, hospitality, and logistics sectors

Back Office ServicesProject StaffingRecruit Train Deploy
#16 of 118 assessed
Bristolassoc
74

Executive search for casino gaming and hospitality sectors

Back Office ServicesCustomer Support BPOData Entry and Annotation
#17 of 118 assessed
Accendnetworks
74

Managed IT, cloud, and network security for public agencies and SMBs

Staff Augmentation
#18 of 118 assessed
Workers.Com
74

Nationwide staffing for light industrial and skilled trades

Back Office ServicesCustomer Support BPOData Entry and Annotation
#19 of 118 assessed
Adopt The Highway Companies
74

SEO and PPC services for inbound lead capture and search visibility

Back Office ServicesCustomer Support BPOData Entry and Annotation
#20 of 118 assessed
Culinarystaffing
73

SEO and PPC services for inbound lead capture and search visibility

Back Office ServicesCustomer Support BPOData Entry and Annotation
#21 of 118 assessed
Friedman Agency
73

Entertainment staffing and payroll services in Hollywood since 1978

Dedicated TeamsProject StaffingRecruit Train Deploy
#22 of 118 assessed
eWorkplace Apps
73
Verified

ERP solutions for Acumatica, enhancing manufacturing and quality management

Back Office ServicesCustomer Support BPOData Entry and Annotation
#22 of 118 assessed
Bxgi
73

SEO and PPC services for inbound lead capture and search visibility

Staff Augmentation
#24 of 118 assessed
Chemistry PR
73

SEO and PPC services for inbound lead capture and search visibility

Back Office ServicesCustomer Support BPOData Entry and Annotation

Also in California · 71 not ranked here

14 have not yet been assessed on the Agency List Score. Alphabetical.
365 Healthcare Staffing ServicesView profile →A-Star StaffingView profile →Alan J. BlairView profile →American Labor PoolView profile →Andiamo GroupView profile →Apollo Business CentersView profile →Arin Fishkin DesignsView profile →ATR InternationalView profile →BCS StaffingView profile →BloominariView profile →CascadiaconsultingView profile →CastandcrewView profile →CegsupportView profile →Champion PrView profile →CityofrcView profile →Clay Burnett GroupView profile →ClutchView profile →CommunicaidView profile →Creative Software InternationalView profile →Direct Line AnswersView profile →Element FiveView profile →Eos Human ResourcesView profile →EvinexView profile →GraphicprodView profile →

About this ranking

What this page ranks

This page ranks 61 of the 118 assessed staff augmentation agencies in California — the ones carrying a published score — out of 132 listed.

The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.

Cohorts and awards

Agencies are compared within a cohort — here, Staff Augmentation in California. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 118, so the strongest award available here is top 5%.

The 14 staff augmentation agencies not yet assessed are listed on this page but not ranked.

A further 57 were assessed and no published evidence of their work was found, so no score is shown for them.

Read the full methodology

Paid placement

Partner agencies can buy a labelled placement block above the ranking on this page. It is always marked as paid and is never mixed into the ranked list.

Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.

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Questions

How many staff augmentation agencies are in California?
132 are listed on Agency List in California. 118 of them have been assessed on the Agency List Score as of October 2026, and 61 of those carry a published score.
Which staff augmentation agency in California is ranked highest?
Ad Club, with an Agency List Score of 96.8, ranks #1 of 118 assessed agencies in Staff Augmentation in California.
Why are 71 staff augmentation agencies listed here but not ranked?
14 of the 132 listed have not yet been assessed on the Agency List Score. A further 57 were assessed and no published evidence of their work was found, so no score is shown for them. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
How is the ranking determined?
By Agency List Score, within the Staff Augmentation in California cohort of 118 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.