GCC | Specialist AdTech Technical Assessment

166 Specialist Interviews Across 4 Niche Tech Areas at an AdTech GCC, With a Sub-1% Proxy Rate

How Annalect's Omnicom Global Capability Center tested niche technology skills with domain experts.

The GCC needed depth checks across Salesforce, cloud and DevOps, Prompt Engineering and enterprise engineering. VProPle matched each candidate to an interviewer from the relevant stack.

Case study snapshot

310Profiles evaluated
166Expert technical interviews
29Selected or conditionally selected
4Specialist technology areas
<1%Proxy incidence
SalesforceCloud & DevOpsPrompt Engineering & GenAIEnterprise Platform Engineering
✓ Annalect's GCC made its own downstream decisions
Reading time2 min
Last updatedSeptember 2026

Niche Stacks Could Not Share One Technical Screen

Established platforms and emerging skills sat in the same pipeline.

Profile Versus Production

Candidates looked qualified on paper but not always ready to work independently in enterprise environments.

Leads Doing Early Screens

Technical leads and architects were spending time on candidates who missed the technical bar.

Niche Skills, Different Tests

Salesforce, cloud, DevOps and Prompt Engineering each needed a different evaluation approach.

Domain Experts Matched to Each Technology Area

Interviews tested practical capability through role-specific questions, scenarios, troubleshooting and implementation discussion. The framework was adapted per role.

Role Blueprint

Each role's stack and seniority set the questions and criteria.

Expert Interview Delivery

Interviewers with hands-on experience in the specific technology conducted each session.

Structured Evaluation

Scoring followed role-specific criteria, so different stacks were judged on their own terms.

Skills and Domains Assessed

Four very different technology areas each had their own interview framework.

Salesforce Engineering

Apex, Lightning Web Components, Visualforce, API integrations, data modelling, security architecture.

Cloud and DevOps

AWS administration, Terraform, Kubernetes, CI/CD, Linux, infrastructure automation.

Prompt Engineering and GenAI

Prompt optimisation, GenAI use cases, AI solution design.

Enterprise Platform Engineering

Coding, system design, root-cause troubleshooting, scalable architecture.

Knowing a Technology Is Not the Same as Applying It

Gaps differed by stack.

Salesforce Depth

Some candidates knew the platform but lacked depth for complex integrations and architecture.

Cloud Implementation

Kubernetes, Terraform and CI/CD ability varied, especially in production troubleshooting.

GenAI Application

Candidates discussed AI tools fluently but differed in turning concepts into usable solutions.

Specialist Interview Time Reserved for Qualified Candidates

Technical checks moved earlier in the process.

Early Technical Filtering

137 of 166 assessed candidates did not clear the technical bar before further internal interviews.

Engineering Bandwidth Protected

Internal teams avoided running every initial technical screen.

Consistent Standards

Role-specific criteria gave a comparable basis across four very different domains.

Case Study Evidence

StageResultConversion and denominator
Profiles evaluated310100%
Expert technical interviews16653.5% of profiles
Selected or conditionally selected2917.5% of interviews; 9.4% of profiles
Did not clear technical bar13782.5% of interviews (derived: 166 minus 29)
Proxy incidenceUnder 1%Across the technical assessment process

Selected and conditionally selected are interview outcomes. Annalect's GCC made its own downstream decisions.

KEY TAKEAWAY

Annalect's GCC needed to verify niche technical skills before spending specialist interview time. VProPle experts interviewed 166 of 310 profiles across four technology areas, 29 cleared the bar, and proxy incidence stayed under 1%.

Hiring for niche technology stacks?

See how VProPle Interview-as-a-Service matches candidates to domain experts for each stack.