All case studies
Recruitment

Happy Calls

An AI voice agent that pre-qualifies recruitment candidates around the clock.

Engagement
6 weeks build · live in production
Team
MKLabs squad of 3 · 1 client stakeholder
Happy Calls product hero
Time-to-first-contact
94% faster

From 48–72 hours down to under 2 minutes.

Recruiter time recovered
22 hrs / week

Per recruiter, reinvested into closing high-fit candidates.

Qualified candidate throughput
3.1×

More qualified candidates reaching the shortlist stage each week.

Cost per qualified candidate
−71%

Vs. the previous fully-manual screening process.

01

The client problem

02

Our solution

Built an AI voice agent that calls every new applicant within 90 seconds of application, conducts a structured 6–8 minute screening interview, and produces a scored summary with audio transcript.

Designed a recruiter dashboard that surfaces only the top-scoring candidates with one-click handoff to the human recruiter for the next stage.

Integrated with the existing ATS so qualified candidates land in the right pipeline stage automatically with all call data attached.

03

Features delivered

Sub-2 minute outbound call

AI agent dials applicants within 90 seconds of application submission, day or night.

Structured screening script

Configurable per-role question set covering availability, right-to-work, salary, and competency.

Real-time candidate scoring

0–100 score with rationale, generated from transcript analysis and role-specific weightings.

Sentiment and engagement signals

Flags hesitations, enthusiasm and red flags so recruiters know what to probe in the human call.

ATS sync

Bidirectional sync with Bullhorn — candidates and call data flow without manual data entry.

Recruiter scorecard view

Filterable list of top candidates with audio playback, transcript and AI summary side-by-side.

04

Technology stack

Voice AI
VapiElevenLabsDeepgram
Orchestration
Node.jsTemporal workflows
Reasoning
GPT-4oClaude 3.5 Sonnet (fallback)
Data & UI
Supabase (Postgres, Auth, RLS)React + TanStack StartTailwind
Integrations
Bullhorn ATSTwilioSlack
05

Inside the product

Operator dashboard — live call analytics, candidate scoring, and sentiment trends.
Operator dashboard — live call analytics, candidate scoring, and sentiment trends.
"We genuinely thought 'AI screening' meant a cheap chatbot. Happy Calls is a structured, scored interview that beats half our junior recruiters. We've stopped losing candidates to slow response times."
Head of Talent
UK staffing agency · 80 recruiters
Could we ship something like this for your business?

Generate a free AI implementation blueprint for your business in minutes — or speak to an MKLabs consultant directly.

Continue reading