Python interview questions: what each one actually predicts on the job (2026)
Canonical: this is a cross-post. The original lives at https://four-leaf.ai/blog/python-interview-questions You can find a hundred Python interview qu…
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Stop Shipping ML Models With Bare Floats: A Deep Dive Into Statistically Rigorous Model Evaluation
Stop Shipping ML Models With Bare Floats Every week, somewhere, a team makes a deployment decision that looks like this: Model A: AUROC = 0.847 Model …
Power analysis for LLM evals: how big does your eval set need to be to catch a 5% regression?
TL;DR: Most eval sets are sized by "what we had lying around", not by what they can actually detect. If your eval set is 50 traces and you are trying …
From Variant CSV to Review-Ready Report: A Python Workflow With Docker and GitHub Actions
Variant prioritisation often starts with a table. But a table alone does not answer the most important question: Which variants deserve closer review,…
Can AI Reason From Marker Genes? Building a Single-Cell Benchmark From PBMC3k
Most single-cell RNA-seq examples end with this pattern: load data preprocess cluster cells generate UMAP rank marker genes assign cell labels That wo…
Your UMAP Looks Great. But Can You Prove the Annotation Is Correct?
How I built a production scanpy pipeline that does not just annotate single-cell data -- it measures how accurately it did so, where it fails, and why…
Don't Skip the Dataset Description (I Almost Did, and It Would've Cost Me)
Started looking for a tourism dataset on Kaggle for a new project. Found one with real UNWTO data, but it only went up to 2022 — not enough for what I…
Why SQL Still Rules the Data World: Surprising Truths from the Relational Revolution
In the hyper-accelerated world of software development, where programming languages often have the shelf life of a smartphone, SQL stands as a defiant…
Python for Machine Learning: The Complete Roadmap Nobody Told You About
When I first started exploring Machine Learning, I made the same mistake most beginners do — I jumped straight into neural networks and model training…
How to Build a LinkedIn Profile Scraper: The Honest Technical Guide
If you have ever tried to build a LinkedIn profile scraper , you have probably discovered that the obvious path — "just call the API" — is a dead end.…
The SEC EDGAR API: A Practical Guide to Free Filing Data in Python
The SEC EDGAR API is one of the best-kept secrets in financial data engineering: every mandatory disclosure filed by every U.S. public company, availa…
Why your synthetic fintech data fails code review (and how mixture models fix it)
Every fintech developer has done this: you need test data, you reach for Faker, you generate ten thousand transactions, and your demo works. Then a da…
We put confidence intervals on our LLM-judge scores. The error bars ate three weeks of "trend"
We track weekly agreement between an LLM judge and human labels (Cohen's kappa) on a sample of production traces. For three weeks the point estimates …
Building GeoPrizm: Turning Global News Events into a Bilateral Relations Index
I recently built GeoPrizm , a free and open-source dashboard for tracking bilateral relations through global news event signals. The idea is simple: i…
# Moving RAG From Demo to Production on Databricks: A Developer-Focused Checklist
By Naveen Ayalla This article is adapted from my original post in the Databricks Community and is shared here for developers, data engineers, and GenA…
There's No Good Programmatic Source for African Macro Data — So I Built One
If you've ever tried to get structured, current, programmatically accessible macroeconomic data for African countries, you've hit the same wall. Bloom…
How to Become a Data Scientist in 2026
How I got here On principle, you will never catch me parading myself as a some sort of expert data scientist. Technically, that's what I do in my day …
How Excel Is Used in Real-World Data Analysis: My First Week Learning Excel
When I started learning Excel as part of my Data Science & Analytics course, I assumed it was just a tool for creating tables and performing basic…
How Excel is Used in Real-World Data Analysis
Before this week, I thought Excel was just a fancy calculator with boxes. But after three days of my Data Science & Analytics course, I realise I …
How Excel is Used in Real-World Data Analysis
Data analysis is at the heart of how we spot patterns and improve systems today. Tools like Python, SQL, Power BI, and Tableau are everywhere in the d…
How Excel Is Used in Real-world Data Analysis
When I started my Data Science and Analytics course a week ago, I expected to spend most of my time learning programming languages and building machin…
The Journey Begins: Week 1 as an Aspiring Data Professional.
Introduction Ladies and gentlemen, I believe in this era of social media, we have all come across content that encourages us to 'Awaken the beast wit…
Excel and Real-World Data Analysis - What I Learned in Week 1
To be honest, when I signed up for a Data Science and Analytics course, it hadn't crossed my mind that Excel was the very first tool I would start wit…
How Excel is Used in Real-World Data Analysis
I have began my journey as a beginner in the data analysis field by learning excel. I have previously used excel to store data but never really consid…
I Built a Fraud Detection System That Catches 99.76% of Fraud — Here's Everything I Learned
There is a number that haunts every fraud detection engineer: 0.13% . That is the fraud rate in the PaySim dataset — 8,213 fraudulent transactions bur…
Excel For Data Analytics
Introduction Excel is a spreadsheet software that allows you to collect, organize, analyze, calculate, and visualize data efficiently. In the first we…
I built a data-contract validator in pure Python (no pandas, no PyYAML) and it caught a 30% revenue ghost
A few months ago I spent the better part of a day chasing a bug that turned out not to be a bug at all. A downstream dashboard showed revenue had jump…
How Excel is Used in Real-World Data Analysis
Introduction A traditional database. That is what many who have not really interacted with Excel to a great extent would define it as in its most basi…
Power BI Visual Monitoring: Automatically Detecting Broken Visuals in Power BI Reports
Key Use Cases Power BI Visual Monitoring can be used for: power bi visual monitoring power bi report visual monitoring visual regression testing for P…
Charting Twitch Chat Velocity: Hype Curve Analysis for Esports VODs
Quick answer: To measure Twitch chat hype or velocity, pull the full VOD chat using the twitch-vod-chat-archive Actor, load the rows into pandas, bin …