Yoel Castaño

I build data products from public open data. Streetary is one of them — a free, independent tool that turns 8+ UK government datasets into a street-level view of neighbourhoods across England and Wales.

I have been working with open geospatial and administrative data since 2025, focused on the same idea across every project: raw government data is rich, but almost unreadable without careful engineering. My job is the engineering.

What I work on

• Streetary (this site) — 730,000+ UK streets, 40,000+ points of interest, 9-dimension scoring, all from open data.
• Callejear network (callejear.com and country sites) — hyperlocal open-data sites for Spain, France, the Netherlands, Belgium, Portugal and other European markets. Same principle as Streetary, adapted per country's public data.

Areas of expertise

• UK and EU government open data (Ordnance Survey, ONS, HM Land Registry, police.uk, Environment Agency, Ofsted, NaPTAN)
• Geospatial data engineering (PostGIS, spatial joins, coordinate systems, address matching)
• ETL pipelines at scale (10⁵–10⁶ entities, quality gates, deduplication, thin-content prevention)
• Programmatic SEO with editorial guardrails (per-page uniqueness, structured data, JSON-LD)
• Independent, ad-free open-data products

How Streetary is built

The full methodology, data sources, quality gates and scoring weights are documented in the About page. Every street page passes five quality gates before publication: identity, sufficient data, uniqueness (no near-duplicates), differentiation, and narrative quality. Currently 99.3% of UK streets clear all five gates.

Editorial standards

Streetary follows five commitments:

1. Independence — no listings, no property portal commissions, no paid rankings, no sponsored inclusions.
2. Transparency — every data source is public and cited; the scoring methodology is public and reproducible.
3. Data recency — datasets refresh at their source's cadence (police.uk monthly, Ofsted rolling, Land Registry monthly, Census fixed). Each street page shows a "Last reviewed" date.
4. Corrections — any factual correction is reviewed personally within 5 working days. Email [email protected] with the URL and the issue.
5. Honest limitations — scores are relative, based on measurable open data. Community, character, noise and many quality-of-life factors are not captured; the About page states this openly.

Contact

• Email: [email protected]
• LinkedIn: linkedin.com/in/yoelcastanopeon