Overview: This production-grade architecture replaces an 8-tool Western SaaS stack (HeyReach, Instantly, Claude Team, Apify, BlogSEO, Wispr, Loom) costing $550+/month with a unified open-weight and private cloud engine costing under $90/month.

1. Architecture Breakdown & Cost Comparison

2. Copy-Paste n8n Workflow Blueprint (workflow.json)

JSON

{
  "name": "ShanghAI Zero-SaaS Lead Enricher & Classifier",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "lead-webhook",
        "options": {}
      },
      "name": "1. Ingest Lead Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 1,
      "position": [250, 300]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "<http://playwright-service:3000/scrape>",
        "bodyParametersUi": {
          "parameter": [
            {
              "name": "target_url",
              "value": "={{ $json.body.profile_url }}"
            },
            {
              "name": "proxy",
              "value": "<http://res-proxy.provider.com:8080>"
            }
          ]
        }
      },
      "name": "2. Playwright Headless Scrape",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.1,
      "position": [480, 300]
    },
    {
      "parameters": {
        "model": "deepseek-chat",
        "messages": {
          "values": [
            {
              "role": "system",
              "content": "You are an elite B2B sales intelligence engine. Extract the ICP fit, main technical pain points, and current company tech stack. Always output strict JSON matching the schema."
            },
            {
              "role": "user",
              "content": "Analyze this scraped payload:\n{{ $json.body.clean_text }}"
            }
          ]
        },
        "options": {
          "temperature": 0.1,
          "response_format": {
            "type": "json_object"
          }
        }
      },
      "name": "3. DeepSeek-V3 Extraction & Scoring",
      "type": "n8n-nodes-base.openAi",
      "typeVersion": 1.3,
      "position": [720, 300],
      "credentials": {
        "openAiApi": {
          "id": "deepseek-serverless-creds",
          "name": "DeepSeek API / OpenAI-Compatible Endpoint"
        }
      }
    },
    {
      "parameters": {
        "conditions": {
          "number": [
            {
              "value1": "={{ $json.body.icp_score }}",
              "operation": "largerEqual",
              "value2": 80
            }
          ]
        }
      },
      "name": "4. Intent Threshold Gate (Score >= 80)",
      "type": "n8n-nodes-base.if",
      "typeVersion": 1,
      "position": [950, 300]
    },
    {
      "parameters": {
        "operation": "send",
        "toEmail": "={{ $('1. Ingest Lead Webhook').item.json.body.email }}",
        "subject": "={{ $json.body.custom_subject }}",
        "text": "={{ $json.body.personalized_body }}"
      },
      "name": "5. Dispatch via Dedicated Inbox Pool",
      "type": "n8n-nodes-base.emailSend",
      "typeVersion": 2,
      "position": [1200, 200]
    }
  ],
  "connections": {
    "1. Ingest Lead Webhook": {
      "main": [[{ "node": "2. Playwright Headless Scrape", "type": "main", "index": 0 }]]
    },
    "2. Playwright Headless Scrape": {
      "main": [[{ "node": "3. DeepSeek-V3 Extraction & Scoring", "type": "main", "index": 0 }]]
    },
    "3. DeepSeek-V3 Extraction & Scoring": {
      "main": [[{ "node": "4. Intent Threshold Gate (Score >= 80)", "type": "main", "index": 0 }]]
    },
    "4. Intent Threshold Gate (Score >= 80)": {
      "main": [
        [{ "node": "5. Dispatch via Dedicated Inbox Pool", "type": "main", "index": 0 }]
      ]
    }
  }
}

3. Production System Prompts

Prompt A: Lead Enrichment & ICP Intent Scorer (DeepSeek-V3)

Plaintext

<system_instruction>
You are an autonomous B2B growth engineer evaluating inbound and scraped prospect data.
Analyze the raw profile payload and output structured JSON only.

Rules:
1. Extract job title, exact company domain, and primary tech stack mentioned.
2. Evaluate ICP Fit score from 0 to 100 based on whether they manage software, data pipelines, or marketing infrastructure.
3. Identify 1 specific operational friction point (e.g., SaaS subscription bloat, data compliance, API rate limits).
4. If ICP Fit is >= 80, write a 2-sentence conversational cold opening mentioning their specific pain point.

Output Schema:
{
  "full_name": "string",
  "company": "string",
  "icp_score": number,
  "detected_pain_point": "string",
  "custom_subject": "string",
  "personalized_body": "string",
  "qualifies_for_outreach": boolean
}
</system_instruction>

Prompt B: Incoming Reply Classifier (Qwen-2.5-72B / DeepSeek)

Plaintext

<system_instruction>
You are an inbound email routing engine. Classify the prospect's reply into one of four intent buckets:
- "POSITIVE_DEMO" (wants to book a call or learn more)
- "TECHNICAL_OBJECTION" (asking questions about security, hosting, pricing, or compliance)
- "OUT_OF_OFFICE" (auto-responder)
- "NEGATIVE_UNSUBSCRIBE" (not interested, remove from list)

Rules:
- If POSITIVE_DEMO: Generate instant calendar booking link payload.
- If TECHNICAL_OBJECTION: Draft a concise, technical 3-line reply addressing their specific objection without being salesy.
- If NEGATIVE_UNSUBSCRIBE: Flag status for immediate suppression list sync.

Output format must be valid JSON matching:
{
  "category": "POSITIVE_DEMO" | "TECHNICAL_OBJECTION" | "OUT_OF_OFFICE" | "NEGATIVE_UNSUBSCRIBE",
  "suggested_action": "push_to_crm" | "trigger_dynamic_reply" | "delay_follow_up" | "blacklist",
  "draft_reply": "string | null"
}
</system_instruction>

4. Playwright Headless Residential Proxy Setup

Run this minimal container on your VPS to execute scraping tasks through your residential proxy pool without getting blocked:

JavaScript

// server.js (Node.js + Playwright)
const express = require('express');
const { chromium } = require('playwright');

const app = express();
app.use(express.json());

app.post('/scrape', async (req, res) => {
  const { target_url, proxy } = req.body;

  const browser = await chromium.launch({
    headless: true,
    proxy: proxy ? { server: proxy } : undefined
  });

  try {
    const context = await browser.newContext({
      userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
    });
    const page = await context.newPage();
    await page.goto(target_url, { waitUntil: 'domcontentloaded', timeout: 30000 });

    // Extract main readable content and strip HTML noise
    const clean_text = await page.evaluate(() => {
      const elements = document.querySelectorAll('script, style, nav, footer, header');
      elements.forEach(el => el.remove());
      return document.body.innerText.replace(/\s+/g, ' ').trim();
    });

    await browser.close();
    res.json({ status: 'success', clean_text });
  } catch (error) {
    await browser.close();
    res.status(500).json({ status: 'error', message: error.message });
  }
});

app.listen(3000, () => console.log('Scraper service live on port 3000'));

5. Inbox Deliverability & Domain Rotation Rules

• Domain Separation: Never send outbound emails from your primary business domain. Buy 3 secondary domains matching your brand name variations (e.g., get[brand].com, [brand]engine.com).
• Inbox Count: Deploy a maximum of 2–3 inboxes per domain (e.g., 6–9 inboxes total across Google Workspace or Microsoft 365).