Expertise — 03
Lead Gen Crawler
Multi-interface web extraction & validation system
The Problem
Traditional lead generation suffers from high manual overhead and expensive third-party SaaS costs for email extraction and validation.
Architecture
Core Engine
BeautifulSoup4 / Requests
Heuristic extraction & page detection
Interfaces
Streamlit / TG Bot
Web-based GUI and Telegram integration
Persistence
SQLite
Structured data storage
Validation
dnspython
MX record & deliverability verification
Implementation
Developed a comprehensive crawling ecosystem featuring a multi-threaded core (5 workers) with intelligent contact-page detection. The system respects robots.txt policies and uses user-agent rotation to ensure high availability. It offers three distinct entry points: a low-overhead CLI for batch processing, a Streamlit-powered web dashboard for interactive one-off extraction, and a dedicated Telegram Bot for on-the-go lead generation.
Processing
2-5s
per domain
Efficiency
5 Workers
Parallel
Storage
SQLite
Reliable
Key Learnings
"The project proved that a custom solution could outperform standardized SaaS tools by implementing specific heuristic rules for 'Contact' page discovery. Building a multi-interface system taught the value of strict separation between core logic and the presentation layer."