One AI Chat Is Not a Research Workspace
Originally published on omid.dev . I was deep in a research thread that was not going to become a weekend post. The topic started small: juniors ask…
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What Has To Be True Before You Trust An AI Data Agent
An AI data agent turns a plain English question into a query, runs it, and hands back an answer. The demo is always impressive. The part that decide…
The 59% Never Happened to You
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Building an Enterprise Football Data Pipeline: Decoding Flashscore's Protocol for xG & Referee Analytics
Most football data scrapers on the market only extract high-level final scores (e.g. 2-1 ). But quantitative sports analysts, data scientists, and p…
I Built a Company That Doesn't Exist to Test an AI Product
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How much does the volatility model move a GEX terminal's numbers? We swapped it and measured
Every published gamma-exposure construction — including the one Cboe's own research uses — prices gamma the same way: Black-Scholes, one implied vol…
What is SPX option flow actually made of? A fifth still trades on a physical floor
Every print on the SPX options tape carries an OPRA condition code naming the pipe it came through: electronic book, complex order book, price-impro…
How fast do dealers hedge SPX 0DTE flow? We measured it: 2-3 minutes
Every dealer-positioning story assumes the same mechanism: customers force option delta onto dealers, dealers hedge it in the underlying, the hedge…
How I built a self-updating visa database from 13,507 passport-destination pairs
For 12 years I handled international onboarding at a company that shipped hardware to 90+ countries. Every month someone asked me the same thing: "D…
Building a Modern Data Lakehouse on AWS: S3, Iceberg, Glue, Athena, and Lake Formation
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Building a Data Trust Score Engine on Google Cloud with BigQuery, Data Catalog & Vertex AI
Data has become one of the most valuable assets for modern enterprises, powering everything from business intelligence dashboards to machine learnin…
We Need a Unicode for Tactile Data — Here's Why I Built One
I've spent the last few years working with tactile sensors in robotics. And if there's one thing that drives me crazy, it's this: every sensor speak…
I built an open cross-reference dataset for 217 global steel grades so engineers stop guessing "is that equivalent?"
__ If you've ever received a spec that says ASTM A36 while your supplier quotes S275JR , you know the moment of dread: are these actually equivalent…
Your Data Structure Is Too Flexible
Python makes it easy to pass data around as dicts, nested JSON blobs, and “whatever the client sent”. That flexibility is useful when you own the sh…
I measured what 12 ATS APIs actually return, across 1.5M job postings
BambooHR's public job endpoint has an isRemote field. Across 50,616 postings from 9,711 live BambooHR boards, not one had it set. Not "most were bla…
Why Statistics Is the Backbone of Data Science
Statistics isn't a supporting subject in data science, it's the thing that makes the "science" part of data science actually mean something. Code Gi…
Repost note: Starlink 10-39 and the data trail after launch
Spaceflight Now covered Starlink 10-39 here . Reposting this because the interesting part is not only the launch image. Starlink 10-39 moved from a…
I Turned 9,575 Jewelry Comments Into Landing-Page Tests—Without Calling Reddit a Market Survey
I had a content-research problem that looked easy at first. Our local Reddit corpus contained 310 jewelry-related threads and 9,575 stored comments.…
Building a Vertical Corpus Builder: Clean JSONL Datasets for LLM Fine-Tuning
Raw web pages are terrible training data. Nav bars, cookie banners, "related articles" and ads drown the signal, and near-identical syndicated text…
We Publish the Data Before It's Correct. On Purpose.
Someone asks for yesterday's maximum temperature in Belgrade. We don't have it. We won't have it for another four days, and when we do have it, the…
Excel in Real-World Data Analysis: Still the Workhorse
Ask any data analyst what tool they touched first, and there's a good chance the answer is Excel. Despite the rise of Python, R, and cloud-based BI…
Beyond OOP: Entity Component System schema for high performance
Object-Oriented Programming (OOP) taught a generation of software engineers to model complex domains by creating class hierarchies. In games and rea…
AIoT and the Physical World: Turning Connected Data Into Industrial Intelligence
IoT systems can tell you what is happening in the physical world. AI can help you understand patterns in the data those systems produce. Put them to…
Why TMDB says your Apple TV+ show airs a day early
A user reported that my TV tracker was showing the wrong air date for Silo . Their favourites card said the next episode aired today. Google said to…
Why Statistics Matters in Data Science
Introduction When we hear the term data science , the first things that may come to mind are Python, SQL, machine learning, or perhaps artificial in…
ARPU Is the Wrong Shape for a Multi-Surface Ad Business
A lot of company-data schemas have an arpu field: total revenue divided by monthly active users, stored as one number per company per period. It's a…
"Power BI Error: The Key Didn't Match Any Rows in the Table"
tags: powerbi, dax, troubleshooting, tutorial canonical_url: https://pbidocs.com/blog/key-didnt-match-any-rows-error The full error reads: The key d…
A Python Model Is Just a Function
Most tools that support both SQL and Python support one of them properly. Python arrives as an escape hatch: a different execution path, a different…
Breaking Down the Shield: Common Misconceptions About Data Privacy
Data privacy is one of those topics everyone has an opinion on, but few people fully understand, and that gap is exactly where bad decisions get mad…
interlace.sh: Why We Built a Unified Abstraction
Consider what a data engineer has to learn before writing a single useful transformation on a typical 2026 data stack. dbt, for SQL models, sources,…