Data Analytics & Business Intelligence

"Data is the new oil, but like oil, it requires refining before it has much value." — Marc...

A free, k-anonymized, daily-refreshed personal-finance + macro data API. Primary-source cited. No auth.

Apache Kafka is a technology that is mainly used to build high-performance, real-time data pipelines...

GBase 8a stores massive analytical datasets across many nodes. If hardware fails, someone drops a...

After analyzing 50 public postmortems from Uber, Netflix, Stripe, and others, four failure patterns...

TL;DR: Most teams over-engineer data ingestion. They use Kafka before they’ve hit their first rate...

A senior engineer's look at Smallpond, DuckDB, Quack, and why lightweight analytical systems may change how we build AI and data pipelines.

BI plus process mining for Insurance: seeing variants, bottlenecks, conformance, and recovery...

A while back I built an analytics tool. It had two ideas: it was cheap, and it sent you an AI summary...

I recently completed an end-to-end Customer Shopping Behavior Analysis project using a dataset of...

Survivorship bias, look-ahead bias, point-in-time data, and the rest of the subtle ways your beautiful backtest is overstating returns. With concrete fixes for

If you work with stock market data from multiple exchanges, you’ve probably run into a frustrating...

Set up a production-ready web scraping pipeline from scratch in 10 minutes using XCrawl API. Step-by-step with code.

Value realization for BFSI Banking: measuring the ROI of workflow, BI, mining, and automation BFSI...

Data authorization for BFSI Banking: roles, tenants, records, evidence, and governed...

Master data governance for BFSI Banking: customers, suppliers, assets, products, controls, and...

Traditional Modern Data Stacks are inherently fragmented, relying on separate silos for streaming,...

Practical tactics to lower Snowflake, BigQuery, and Redshift costs via storage layout, clustering, materialized views, and right-sized compute.

Explore Apache Hadoop and the big data ecosystem. Discover managed cloud versions for efficient data processing, analytics, and storage without infrastructure

Harden MCP tool outputs with route-level response ceilings, schema discipline, artifact handoff, redaction, pagination, truncation receipts, and traces.

Managing stock isn't just about counting boxes in a warehouse. Anyone who has run a retail setup or...

The Fundamental Structure of SQL Indexes: Why Do They Matter? In a production ERP system,...

I wanted to compare affordable housing per capita across NYC and San Francisco. Their open-data portals had other ideas. Six cities, one PostGIS schema, and the

Traditional Business Intelligence tools rely on slow client-server queries that buckle under massive...

How I went from 27-minute to 9-second backtests on a 30-day US500 simulation by killing pandas datetime overhead. The boring detail that unlocked real iteration

Master graph queries in SQL using recursive CTEs, adjacency lists, and the WITH RECURSIVE clause. Compare SQL graph queries vs dedicated graph databases.

Comprehensive guide to geospatial data with PostGIS. Understand geometry vs geography types, spatial indexes, and common geospatial queries for GIS applications

A trainer's honest, fun retrospective on teaching SQL from scratch - JOINs, window functions, CTEs, and one very messy hotel dataset.

Learn Change Data Capture patterns with Debezium, PostgreSQL logical replication, and stream processing integration. Real-time data pipelines without performanc

As CodeGen tools continue to develop, with tools such as Graphify optimising token usage even...

Invoice processing is one of those problems that looks simple until you actually try to build it. Reading data from a PDF invoice should be straightforward — bu

Agoda data engineering interview questions skew toward high-volume marketplace telemetry: streams of...

Tiger Analytics data engineering interview questions usually behave like consulting delivery loops:...

Why Most People Fail at Analyzing the U.S. Stock Market The U.S. stock market looks simple...

Analysis of pricing, discounts, and reviews across 109 Steam games. 30 data fields per game including price, review scores, genres, and platform support.

Roblox data engineering interview questions skew toward text-heavy product telemetry: search...

Tesla data engineering interview questions bridge high-volume telemetry narratives and...

I pulled a 20-row sample of Google Ads Transparency Center to see whether the dataset is rich enough...

Exodus Point data engineering interview questions sit where quant-adjacent hiring meets...

I recently built a browser-based SQL tool in my portfolio site: DataBro SQL Query Tool 🚀 It lets you...

When you are evaluating a new data source the first thing you want is not the marketing pitch, it is...

I had a short window this week to evaluate Website Contact as a data source. Here is the condensed...

Your Pipeline Is 8.3h Behind: Catching Business Sentiment Leads with Pulsebit We just...

Reverse ETL is one of the most searched terms in modern data stacks—and also one of the most...

What are DDL and DML? DDL (Data Definition Language) DDL refers to SQL commands used to define and...

The two metrics every analytics user mixes up. How GA4 redefined Bounce Rate against Engagement Rate, why Exit Rate is missing from default GA4 reports, and how

Quick disclaimer: I do data work on a program-integrity team. Examples below use generic transaction...

Plotly Express's choropleth is one of the cleanest "low-code, high-output" data viz tools in the...