Building a Sub-20ms UK Companies House & Financial Vision API

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Connecting to government registries often comes with common pain points: rate-limit cascades (HTTP 429 errors), messy non-standardized address strings, missing GPS coordinates, and unstructured balance sheet PDFs.

To solve this, I built the UK Business Data, Address Sanitizer & Financial Intelligence API—a high-speed, enterprise-grade global proxy that standardizes company records, retrieves live board officers, and extracts financial metrics from filing PDFs into clean JSON.

What The API Solves

Smart Address Normalization & Geocoding
Messy registered office addresses are automatically reformatted into Title Case and enriched with verified WGS-84 GPS coordinates (latitude, longitude, and administrative district).
Automated Balance Sheet Extraction
Instead of forcing analysts to manually read filing PDFs, the /financials endpoint passes document streams to custom Vision Models to parse unstructured balance sheets into strictly-typed JSON schemas.
High-Speed Document Proxy Streaming
The /document endpoint proxies Companies House S3 buckets with CORS headers injected, enabling direct PDF rendering inside web portals and iFrames.
Zero Rate-Limit Dropouts
An intelligent, distributed 24-hour caching layer absorbs upstream rate surges to eliminate 429 dropouts and deliver sub-20ms response times.