Project Overview
ForceHQ needed an immersive, highly interactive AI Interview Agent capable of conducting real-time, human-like interviews. The AI needed to do more than just speak—it had to interact visually with candidates by presenting multimedia objects, track interview time limits, transcribe the conversation live, and record the entire session (screen and audio) for later review by human recruiters.
LiveKit Multimodal Streaming
We built a highly responsive WebRTC pipeline using LiveKit to handle ultra-low latency audio and video streaming between the candidate and the AI.
Advanced LLM Tool Calling
We utilized advanced LLM Tool Calling to give the AI agent agency over the interview environment. The AI can dynamically trigger multimedia popups and manage the interview timer based on the conversational context.
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Real-Time STT Transcription
Integrated live Speech-to-Text (STT) for real-time transcription, allowing the AI to process candidate answers instantly and displaying closed captions on the UI.
LiveKit Egress for Cloud Recording
Implemented LiveKit Egress to capture and composite the audio, video, and shared multimedia objects into a single MP4 file, securely saving the interview to the cloud for human recruiters to review later.
Key Challenges
Challenge 1
The AI needed agency to control the UI, such as showing technical diagrams or code snippets during the interview.
Challenge 2
Achieving ultra-low latency audio/video streaming so the conversation felt natural and fluid.
Challenge 3
Recording the entire session (audio, video, and screen) reliably in the cloud without degrading the candidate's local browser performance.
Challenge 4
Ensuring the AI could track time and gracefully transition between different phases of the interview (e.g., Intro, Technical, Behavioral, Outro).