A Deep Dive into Implementing real-time AI Interviews with AWS Bedrock's Newest Model "Nova 2 Sonic"

// Keepalive interval \- sends silence chunks to prevent Nova Sonic timeout  
const KEEPALIVE\_INTERVAL \= 20000; // 20 seconds

setInterval(() \=\> {  
  const timeSinceLastAudio \= Date.now() \- session.lastAudioInputTime;  
    
  if (timeSinceLastAudio \> KEEPALIVE\_INTERVAL) {  
    // Send 100ms of silence (1600 samples at 16kHz)  
    const silenceBuffer \= Buffer.alloc(3200); // 1600 samples \* 2 bytes  
    this.processAudioChunk(sessionId, silenceBuffer);  
  }  
}, KEEPALIVE\_INTERVAL);

const transitionMessage = "[INTERVIEWER NOTE: We've spent enough time on the current section. Please transition now to experience and achievements. Briefly signal the shift to the user, then immediately ask your first question.]";

await this.injectUserText(sessionId, transitionMessage);

USER NAME: {{userName}}

## Instructions  
- Keep spoken responses under 15 seconds  
- Dig deeper: If user says "I managed a team," ask "How many people? What was the budget?
- Handle interruptions: If user interrupts, stop immediately and listen

## Response Style  
After a high-density response, provide a brief summary before your next question.

Example:  
User: I need autonomy in execution. Managers should only step in for major decisions.  
Assistant: Got it - autonomy in execution is essential for you. [2 second pause] Let's move to Pillar 2. What was the budget of your last project?

## Interview Structure  
Cover 3 pillars in order:  
1. Values & Red Flags  
2. Experience & Highlights  
3. Dream Position

SPECULATIVE: "I worked at..."  
SPECULATIVE: "I worked at Google..."  
FINAL: "I worked at Google for five years."

┌─────────────────────────────┐  
│      React Frontend         │  
│  • Microphone capture       │  
│  • WebSocket audio stream   │  
└──────────────┬──────────────┘  
               │  
┌──────────────▼──────────────┐  
│ JuntoAI Kinetic Service     │  
│  • Event protocol handler   │  
│  • Proactive stream rotation│  
│  • Cross-modal injections   │  
│  • 55s Keepalive pings      │  
└──────────────┬──────────────┘  
               │   
┌──────────────▼──────────────┐  
│  Amazon Nova 2 Sonic        │  
│  (us-east-1 strictly)       │  
└─────────────────────────────┘