Alonso Burón — Writing https://alonsoburon.cl/blog Alonso Burón is a Lead Data Engineer based in Santiago, Chile, who architects Warp, an in-house EtLT platform at Datawalt that consolidates 60+ enterprise systems into BigQuery and ClickHouse, and who authored the ECL (Extract, Conform, Load) framework for production data pipelines. He also builds agentic systems — MCP servers, reusable Agent Skills and cost-tiered multi-agent orchestrations — including an open API and MCP server for point-in-time macroeconomic data. en alonso.buron@proton.me (Alonso Burón) Don't pre-aggregate, land the movements and build the photo downstream https://alonsoburon.cl/blog/0012_dont_pre_aggregate https://alonsoburon.cl/blog/0012_dont_pre_aggregate Mon, 04 May 2026 00:00:00 GMT Alonso Burón Why every consumer who says they only need the totals will eventually ask for the detail. The health table, the one piece of infrastructure I would build first https://alonsoburon.cl/blog/0011_health_table https://alonsoburon.cl/blog/0011_health_table Sat, 18 Apr 2026 00:00:00 GMT Alonso Burón One row per table per run, raw measurements only. Everything else is a query on top. Tiered freshness, or how I stopped refreshing everything on the same cron https://alonsoburon.cl/blog/0010_tiered_freshness https://alonsoburon.cl/blog/0010_tiered_freshness Mon, 30 Mar 2026 00:00:00 GMT Alonso Burón Hot, warm, and cold tiers — partition the pipeline so the tables that matter most get attention first. The three metadata columns I add to every extraction https://alonsoburon.cl/blog/0009_metadata_columns https://alonsoburon.cl/blog/0009_metadata_columns Sat, 14 Mar 2026 00:00:00 GMT Alonso Burón _extracted_at, _batch_id, _source_hash — what each one costs and what it buys. Staging swap, or how to full-replace a live table without anyone noticing https://alonsoburon.cl/blog/0008_staging_swap https://alonsoburon.cl/blog/0008_staging_swap Wed, 25 Feb 2026 00:00:00 GMT Alonso Burón Load into staging, validate, swap atomically. Zero downtime, trivial rollback. Hard delete detection, the case every cursor misses https://alonsoburon.cl/blog/0007_hard_delete_detection https://alonsoburon.cl/blog/0007_hard_delete_detection Tue, 03 Feb 2026 00:00:00 GMT Alonso Burón The row was there yesterday and gone today. A cursor never sees it, so something else has to. Purity vs. freshness, the tradeoff every pipeline already made https://alonsoburon.cl/blog/0006_purity_vs_freshness https://alonsoburon.cl/blog/0006_purity_vs_freshness Thu, 15 Jan 2026 00:00:00 GMT Alonso Burón Why full replace is the default, and when to deviate from it. The lies your sources tell you https://alonsoburon.cl/blog/0005_the_lies_sources_tell https://alonsoburon.cl/blog/0005_the_lies_sources_tell Mon, 22 Dec 2025 00:00:00 GMT Alonso Burón A field guide to the assumptions that will eventually break your pipeline. The EL myth, and why I started calling it ECL https://alonsoburon.cl/blog/0004_the_el_myth https://alonsoburon.cl/blog/0004_the_el_myth Thu, 04 Dec 2025 00:00:00 GMT Alonso Burón Pure EL doesn't exist. Every pipeline conforms whether it admits it or not. Incremental ingestion cheat-sheet - Guide for batch ingestion with real (ugly) data https://alonsoburon.cl/blog/0003_incremental_loading_rules_for_multiple_cases https://alonsoburon.cl/blog/0003_incremental_loading_rules_for_multiple_cases Sun, 26 Oct 2025 00:00:00 GMT Alonso Burón Multiple examples of incremental loading rules for different cases I got promoted to team lead by thinking about scalability https://alonsoburon.cl/blog/0002_leading_data_engineering_team https://alonsoburon.cl/blog/0002_leading_data_engineering_team Mon, 15 Sep 2025 00:00:00 GMT Alonso Burón Go for growth, not just technical skills I got a job by helping my girlfriend with her homework https://alonsoburon.cl/blog/0001_from-music-student-to-data-lead https://alonsoburon.cl/blog/0001_from-music-student-to-data-lead Fri, 11 Jul 2025 00:00:00 GMT Alonso Burón How helping with Stata homework led to a career in D.Eng.