UK Council Planning Applications Data Ingestion Pipeline
Multi-threaded automated web crawler ingesting thousands of local government council planning applications with resilient proxy rotation.
Problem Statement & High-Level Architecture
Built an enterprise-grade automated web scraping pipeline that extracts, normalizes, and indexes public planning and property development applications across UK local government councils.
Engineering Design & Data Pipeline
Engineered with Python, SQLite, structured logging, and robust session persistence. Capable of parsing complex government forms, paginated record tables, and document attachments with automated retry mechanisms.
Platform Features & Technical Capabilities
Automated crawling across multi-tier UK local government planning portals
Structured SQLite / PostgreSQL schema storage with normalized applicant & property records
Automated proxy pool rotation, user-agent randomization, and exponential backoff error handling
Detailed execution logging with real-time error alerts and progress diagnostics
Engineering Bottlenecks & Architectural Solutions
Handling diverse, legacy council portal architectures with varying pagination mechanisms and aggressive rate limiting.
- Fragmented local council portal architectures with bespoke form and pagination mechanisms.
- Session timeouts and aggressive rate limits dropping in-flight batch extractions.
- Duplicate records resulting from multi-stage planning application amendments.
Created modular scraper adapters with automated session cookie management and adaptive rate-throttling algorithms.
- Modular adapter architecture wrapping diverse council CMS engines into uniform interfaces.
- Resilient session manager handling cookie persistence and automated exponential retry.
- Idempotent upsert pipeline deduplicating notices against composite council reference keys.