https://chatquill.dev/Software engineering, data science and AI, by Mohun Shakeel Ahmad.https://chatquill.dev/blog/prompt-engineering-2026https://chatquill.dev/blog/prompt-engineering-2026Expert personas, ALL CAPS and "think step by step" are dead. What actually works with AI coding tools now: name the change, the place and the check.Mon, 05 Oct 2026 00:00:00 GMThttps://chatquill.dev/blog/race-conditionhttps://chatquill.dev/blog/race-conditionTwo threads access the same data at the same time. One of them wins. The other one silently corrupts your state. No error thrown.Tue, 09 Jun 2026 00:00:00 GMThttps://chatquill.dev/blog/reddit-sentiment-analysishttps://chatquill.dev/blog/reddit-sentiment-analysisA complete sentiment analysis of nearly 6,000 Reddit mental health posts using VADER — covering data cleaning, scoring, and five visualisations that each reveal something different about how people express themselves in these communities.Sun, 31 May 2026 00:00:00 GMThttps://chatquill.dev/blog/stable-diffusionhttps://chatquill.dev/blog/stable-diffusionYou typed a sentence and got a painting. Here is what actually happened between those two things.Mon, 25 May 2026 00:00:00 GMThttps://chatquill.dev/blog/ruby-on-rails-2026https://chatquill.dev/blog/ruby-on-rails-2026Four years of production code. Real deadlines, real bugs, real clients. Here is what Rails still gets right — and where I genuinely reach for something else.Sun, 17 May 2026 00:00:00 GMThttps://chatquill.dev/blog/k-means-clusteringhttps://chatquill.dev/blog/k-means-clusteringMost tutorials hand you sklearn.cluster.KMeans and call it a day. This one builds it from nothing, watches it think, and shows you exactly what the algorithm is doing at every step.Mon, 11 May 2026 00:00:00 GMThttps://chatquill.dev/blog/data-soldhttps://chatquill.dev/blog/data-soldFrom the device fingerprint logged before you do anything, to the millisecond auction that decides your worth to an advertiser — here is the full chain, and the buyer list nobody talks about.Sun, 03 May 2026 00:00:00 GMThttps://chatquill.dev/blog/ml-zero-mathhttps://chatquill.dev/blog/ml-zero-mathYou use machine learning dozens of times a day without realising it. No equations, no jargon, no prerequisites — just the real idea explained clearly.Wed, 29 Apr 2026 00:00:00 GMThttps://chatquill.dev/blog/ai-code-reviewhttps://chatquill.dev/blog/ai-code-reviewAfter four years shipping production code, here is what AI-assisted review actually gets right, where it fails, and the workflow I use at SharinPix today.Sat, 25 Apr 2026 00:00:00 GMT