Author: Jose S
How to make data maps that inform without misleading people
Maps persuade fast, which is why bad bins and raw-count choropleths mislead so well. Use an honest map path: question, aggregation, color scale, and caveats you refuse to…
- 12 min read
Portfolio projects that do not look fake
Portfolio projects fail when they look like homework clones. Build one believable stack: real question, messy data, decisions, checks, and a short memo a hiring manager can trust.
Building a personal learning plan: SQL to Python to AI
A personal learning plan from SQL to Python to AI beats random tutorials. Build a sequenced path, a weekly hour budget, and proof of skill so you stop…
How to use retries and sensors in Apache Airflow, and when to skip Airflow
Retries buy time for flukes; sensors encode waiting with deadlines. Learn when to retry, how to sensor a late file without burning workers, and when Airflow is the…
How to define customer churn and retention so everyone agrees
Separate logo churn, revenue churn, gross retention, and net retention before you argue. Same word, different formulas, different decisions.
