assemblyai-reference-architecture

name	assemblyai-reference-architecture
description	Implement AssemblyAI reference architecture with best-practice project layout. Use when designing new AssemblyAI transcription services, reviewing project structure, or building production-grade speech-to-text applications. Trigger with phrases like "assemblyai architecture", "assemblyai best practices", "assemblyai project structure", "how to organize assemblyai", "assemblyai design".
allowed-tools	Read, Grep
version	1.5.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","ai","speech-to-text","assemblyai","transcription","architecture"]
compatibility	Designed for Claude Code

AssemblyAI Reference Architecture

Overview

Production-ready architecture for AssemblyAI-powered transcription services with layered design, webhook-driven processing, and LeMUR analysis pipelines.

Prerequisites

• Understanding of layered architecture
• assemblyai npm package
• TypeScript project setup
• Database for transcript storage

Project Structure

my-transcription-service/
├── src/
│   ├── assemblyai/
│   │   ├── client.ts              # Singleton client
│   │   ├── transcription.ts       # Transcription service
│   │   ├── streaming.ts           # Streaming service
│   │   ├── lemur.ts               # LeMUR analysis service
│   │   └── types.ts               # Domain types
│   ├── api/
│   │   ├── transcribe.ts          # POST /api/transcribe
│   │   ├── transcripts.ts         # GET /api/transcripts/:id
│   │   ├── streaming-token.ts     # GET /api/streaming-token
│   │   └── webhooks/
│   │       └── assemblyai.ts      # POST /webhooks/assemblyai
│   ├── services/
│   │   ├── audio-processor.ts     # Audio validation & preprocessing
│   │   └── transcript-store.ts    # Database storage
│   ├── jobs/
│   │   └── batch-transcriber.ts   # Background batch processing
│   └── config.ts
├── tests/
│   ├── unit/
│   │   ├── transcription.test.ts
│   │   └── lemur.test.ts
│   └── integration/
│       └── assemblyai.test.ts
└── package.json

Architecture Layers

┌──────────────────────────────────────────────────────┐
│                    API Layer                          │
│  Transcribe endpoint, Webhook handler, Stream token  │
├──────────────────────────────────────────────────────┤
│                  Service Layer                        │
│  TranscriptionService, LeMURService, AudioProcessor  │
├──────────────────────────────────────────────────────┤
│                AssemblyAI SDK Layer                   │
│  client.transcripts, client.streaming, client.lemur  │
├──────────────────────────────────────────────────────┤
│               Infrastructure Layer                    │
│  Database, Redis Cache, Job Queue, Monitoring        │
└──────────────────────────────────────────────────────┘

Instructions

Step 1: Client Layer

// src/assemblyai/client.ts
import { AssemblyAI } from 'assemblyai';

let client: AssemblyAI | null = null;

  ():  {
   (!client) {
    client =  ({
      : process..!,
    });
  }
   client;
}