Phone screens are inconsistent, time-consuming, and biased. Different interviewers ask different questions. Candidates are judged on how they sound, not what they say. And the whole process takes 30 minutes of a recruiter's time per candidate — time that could be spent on candidates who actually made it through screening.
We built a 3D AI avatar that conducts structured interviews — and the results surprised us.
Why 3D?
We tried text-based chat interviews first. Candidates found them impersonal and rushed through answers. We tried audio-only AI. Candidates found it uncanny — the disembodied voice without visual feedback felt off.
A 3D avatar hits a different register. It's clearly not human, but it's engaging. Candidates report feeling less judged and more willing to give honest, detailed answers. The visual presence creates a sense of conversation rather than interrogation.
How It Works
The avatar is built with Three.js and powered by AWS Bedrock. The full interview flow:
- Candidate receives a unique link and starts the interview at their convenience
- The avatar introduces itself and explains the process
- Questions are generated dynamically based on the job description and the candidate's resume
- Responses are transcribed in real-time using Whisper
- Each response is scored against the job requirements
- Video is analyzed for confidence, eye contact, fidgeting, and emotional tone
- A structured report is generated with strengths, weaknesses, and a hire/no-hire recommendation
What We Measure
Beyond the transcript, we analyze several dimensions of candidate performance:
- Confidence score: Posture, voice steadiness, eye contact percentage
- Engagement: Response length, follow-up depth, question comprehension
- Communication: Clarity, structure, vocabulary diversity
- Job fit: How well answers align with the role requirements and rubric criteria
Custom Evaluation Rubrics
Every company evaluates candidates differently. A logistics company cares about reliability and physical stamina. A tech company cares about problem-solving and communication. Our rubric system lets you define weighted criteria — and the AI scores every candidate against your specific requirements, not a generic template.
Rubrics are AI-generated from a plain English description of what you're looking for, then refined through a chat interface. Each criterion has 5 scoring levels (Excellent to Poor) with detailed descriptions.
The Outcome
Recruiters using Sluble's AI interviewer report spending 70% less time on first-round screening. Candidates report a more consistent, fair experience. And the quality of candidates who make it to human interviews is significantly higher — because the AI has already filtered for the criteria that matter most.