Instantly Reference Architecture

Overview

Production architecture for cold outreach automation with Instantly. Covers campaign orchestration, lead management pipelines, multi-account warmup strategies, and reply handling with CRM synchronization.

Prerequisites

• Instantly API key (v1 REST)
• Email accounts configured with warmup
• CRM for lead status tracking
• Webhook endpoint for reply/bounce handling

Architecture Diagram

set -euo pipefail
┌──────────────────────────────────────────────────────┐
│              Lead Sources                             │
│  Clay │ Apollo │ CSV Import │ CRM Export │ API       │
└──────────┬───────────────────────────────────────────┘
           │
           ▼
┌──────────────────────────────────────────────────────┐
│              Instantly Platform                       │
│  ┌──────────────┐  ┌──────────────┐  ┌───────────┐   │
│  │ Email        │  │ Campaigns    │  │ Lead      │   │
│  │ Accounts     │  │ & Sequences  │  │ Lists     │   │
│  │ (warmup)     │  │ (A/B test)   │  │ (import)  │   │
│  └──────┬───────┘  └──────┬───────┘  └─────┬─────┘   │
│         │                 │                │          │
│         ▼                 ▼                ▼          │
│  ┌──────────────────────────────────────────────┐     │
│  │         Sending Engine                        │     │
│  │  Throttling │ Rotation │ Tracking │ Warmup   │     │
│  └──────────────────────┬───────────────────────┘     │
└─────────────────────────┼───────────────────────────┘
                          │
           ┌──────────────┼──────────────┐
           ▼              ▼              ▼
   ┌──────────────┐ ┌────────┐ ┌──────────────┐
   │ Replies      │ │ Opens  │ │ Bounces      │
   │ (webhook)    │ │ Clicks │ │ Unsubscribes │
   └──────┬───────┘ └────────┘ └──────────────┘
          │
          ▼
   ┌──────────────┐
   │ CRM Sync     │
   │ (HubSpot/SF) │
   └──────────────┘

Instructions

Step 1: Campaign Management Service

const INSTANTLY_API = 'https://api.instantly.ai/api/v1';

async function instantlyRequest(endpoint: string, options?: RequestInit) {
  const url = new URL(`${INSTANTLY_API}${endpoint}`);
  url.searchParams.set('api_key', process.env.INSTANTLY_API_KEY!);

  const response = await fetch(url.toString(), {
    ...options,
    headers: { 'Content-Type': 'application/json', ...options?.headers },
  });

  if (!response.ok) throw new Error(`Instantly API error: ${response.status}`);
  return response.json();
}

async function listCampaigns() {
  return instantlyRequest('/campaign/list');
}

async function getCampaignStatus(campaignId: string) {
  return instantlyRequest(`/campaign/get?campaign_id=${campaignId}`);
}

Step 2: Lead Upload Pipeline

interface Lead {
  email: string;
  first_name?: string;
  last_name?: string;
  company_name?: string;
  personalization?: string;
  custom_variables?: Record<string, string>;
}

async function uploadLeads(campaignId: string, leads: Lead[]) {
  const BATCH_SIZE = 100;
  let totalUploaded = 0;

  for (let i = 0; i < leads.length; i += BATCH_SIZE) {
    const batch = leads.slice(i, i + BATCH_SIZE);
    await instantlyRequest('/lead/add', {
      method: 'POST',
      body: JSON.stringify({
        campaign_id: campaignId,
        skip_if_in_workspace: true,
        leads: batch,
      }),
    });
    totalUploaded += batch.length;
    await new Promise(r => setTimeout(r, 200)); // Rate limit  # HTTP 200 OK
  }

  return { uploaded: totalUploaded };
}

Step 3: Multi-Sequence Campaign Structure

// Campaign sequence design for cold outreach
const CAMPAIGN_SEQUENCE = {
  name: 'Q1 Outreach - {ICP Segment}',
  sequences: [
    {
      step: 1,
      delay: 0,
      subject: 'Quick question about {{company_name}}',
      body: 'Hi {{first_name}},\n\n{{personalization}}\n\n...',
      variant: 'A',
    },
    {
      step: 1,
      delay: 0,
      subject: '{{first_name}} - saw something interesting',
      body: 'Hi {{first_name}},\n\n...',
      variant: 'B', // A/B test variant
    },
    {
      step: 2,
      delay: 3, // 3 days after step 1
      subject: 'Re: Quick question',
      body: 'Hi {{first_name}},\n\nJust following up...',
    },
    {
      step: 3,
      delay: 5, // 5 days after step 2
      subject: 'Last try',
      body: 'Hi {{first_name}},\n\nI know you\'re busy...',
    },
  ],
};

Step 4: Reply Handling Webhook

app.post('/webhooks/instantly', express.json(), async (req, res) => {
  const { event_type, lead_email, campaign_id, reply_text } = req.body;

  switch (event_type) {
    case 'reply_received':
      await syncToCRM({ email: lead_email, status: 'replied', note: reply_text });
      break;
    case 'email_bounced':
      await syncToCRM({ email: lead_email, status: 'bounced' });
      break;
    case 'unsubscribed':
      await addToSuppressionList(lead_email);
      break;
  }

  res.json({ processed: true });
});

Error Handling

Examples

Campaign Analytics Dashboard

async function getCampaignMetrics() {
  const campaigns = await listCampaigns();
  return Promise.all(campaigns.map(async (c: any) => ({
    name: c.name,
    status: c.status,
    analytics: await instantlyRequest(
      `/analytics/campaign/summary?campaign_id=${c.id}`
    ),
  })));
}

Resources

• Instantly API Documentation
• Instantly Campaign Guide

Output

• Configuration files or code changes applied to the project
• Validation report confirming correct implementation
• Summary of changes made and their rationale