https://riadhmnasri.fr/en/blog Freelance tech lead: software architecture, applied AI for development, complex systems. Articles, project portfolio and notes. en https://riadhmnasri.fr/en/blog/scheduled-agents-automating-a-recurring-task https://riadhmnasri.fr/en/blog/scheduled-agents-automating-a-recurring-task Running an agent unsupervised changes the question you ask: no longer 'does it work', but 'what happens the day it doesn't'. Thu, 13 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/building-your-own-claude-code-skill https://riadhmnasri.fr/en/blog/building-your-own-claude-code-skill A poorly written skill never triggers. Here's the method I use to turn a repeated habit into a reliable one. Wed, 12 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/thread-dump-usefulness-how-to-and-difference-from-heap-dump https://riadhmnasri.fr/en/blog/thread-dump-usefulness-how-to-and-difference-from-heap-dump A thread dump doesn't show what's in memory, it shows what every thread is doing, or waiting for. It's the tool for a stall, not a leak. Tue, 11 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/investigating-a-jvm-stall-with-a-heap-dump https://riadhmnasri.fr/en/blog/investigating-a-jvm-stall-with-a-heap-dump A stalled component isn't always a memory problem, and a heap dump isn't always the right tool. Here's how to know which one to reach for, and how to read one correctly once you have it. Mon, 10 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/running-a-coding-dojo-choosing-a-kata-and-driving-it-with-tdd https://riadhmnasri.fr/en/blog/running-a-coding-dojo-choosing-a-kata-and-driving-it-with-tdd A dojo isn't a meeting to ship code, it's a session to observe how code gets written. The format and the kata determine whether that distinction survives or collapses. Sun, 09 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/what-my-mba-at-polytechnique-taught-me https://riadhmnasri.fr/en/blog/what-my-mba-at-polytechnique-taught-me Twenty years of code teach you how to build a system. The Digital Transformation Strategist program taught me how to decide which one to build, and why. Sat, 08 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/swiss-pairings-the-algorithm-behind-a-tournaments-fairness https://riadhmnasri.fr/en/blog/swiss-pairings-the-algorithm-behind-a-tournaments-fairness Neither a round-robin that would never end, nor a single-elimination bracket that knocks out half the field after one unlucky game: the Swiss system solves a real pairing problem. Thu, 06 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/sealed-classes-modeling-a-finite-set-of-cases https://riadhmnasri.fr/en/blog/sealed-classes-modeling-a-finite-set-of-cases A sealed class doesn't just replace an enum: it turns a forgotten case into a compile error instead of a bug discovered in production. Wed, 05 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/apache-spark-on-kubernetes-and-azure-for-risk-computation https://riadhmnasri.fr/en/blog/apache-spark-on-kubernetes-and-azure-for-risk-computation Simulating thousands of market scenarios across an entire portfolio, every night, before markets open: the kind of constraint that actually justifies Spark on Kubernetes. Tue, 04 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/optimizing-token-usage-with-claude-and-copilot https://riadhmnasri.fr/en/blog/optimizing-token-usage-with-claude-and-copilot Tokens aren't just an API bill: a bloated context also degrades response quality. The techniques that make a real difference, day to day. Mon, 03 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/kubernetes-day-to-day-for-a-java-developer https://riadhmnasri.fr/en/blog/kubernetes-day-to-day-for-a-java-developer Not a kubectl tutorial, but the points where Kubernetes and the JVM rub against each other, across GCP, Azure and AWS. Sun, 02 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/real-tdd-with-claude-code https://riadhmnasri.fr/en/blog/real-tdd-with-claude-code TDD isn't 'write tests first'. It's a precise cycle, with named techniques, that AI makes both easier to follow and easier to unknowingly betray. Sat, 01 Aug 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/setting-your-day-rate-beyond-the-calculator https://riadhmnasri.fr/en/blog/setting-your-day-rate-beyond-the-calculator A day rate isn't chosen by looking at the market average. It's built from what it needs to cover, line by line. Fri, 31 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/var-value-at-risk-what-it-measures-and-doesnt https://riadhmnasri.fr/en/blog/var-value-at-risk-what-it-measures-and-doesnt The most widely used market risk metric in banking is also one of the most misunderstood, including by some who cite it. Thu, 30 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/schema-registry-versioning-kafka-without-breaking-consumers https://riadhmnasri.fr/en/blog/schema-registry-versioning-kafka-without-breaking-consumers A Kafka topic decouples services, but the message format stays an implicit contract. A schema registry makes it explicit and verifiable. Wed, 29 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/how-i-built-this-blog-with-claude-code https://riadhmnasri.fr/en/blog/how-i-built-this-blog-with-claude-code An exercise in transparency: this site was designed, redesigned several times, and filled with content in conversation with Claude Code. Tue, 28 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/hexagonal-architecture-in-practice https://riadhmnasri.fr/en/blog/hexagonal-architecture-in-practice Why isolating the business domain from frameworks changes how you design and test a system. Mon, 27 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/ai-as-a-thinking-partner https://riadhmnasri.fr/en/blog/ai-as-a-thinking-partner After more than 20 years of development, it isn't AI that changed how I code, it's how I question it. Mon, 20 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/agent-harness-skills-hooks https://riadhmnasri.fr/en/blog/agent-harness-skills-hooks AI agents are all anyone talks about right now, but four distinct concepts often get blurred together. Wed, 15 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/augmented-developer-claude-code https://riadhmnasri.fr/en/blog/augmented-developer-claude-code Four concrete practices for using an AI CLI tool in a structured, safe and effective way, instead of blind vibe coding. Fri, 10 Jul 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/living-documentation-claude-skill https://riadhmnasri.fr/en/blog/living-documentation-claude-skill The problem was never the team's willingness, it was the cost of updating docs by hand. Here's how a Claude Skill fixed that. Thu, 25 Jun 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/counterparty-risk-explained-to-a-developer https://riadhmnasri.fr/en/blog/counterparty-risk-explained-to-a-developer A market finance concept that makes more sense in engineering terms than in formulas. Mon, 15 Jun 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/tdd-under-deadline-pressure https://riadhmnasri.fr/en/blog/tdd-under-deadline-pressure The most common intuition about TDD is also the most wrong: that it slows you down when you're in a hurry. Thu, 28 May 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/why-kotlin-remains-my-jvm-language-of-choice https://riadhmnasri.fr/en/blog/why-kotlin-remains-my-jvm-language-of-choice Three unrelated projects (a revision app, a counterparty risk library, a tournament engine) share the same language choice, and that's no coincidence. Tue, 05 May 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/spaced-repetition-leitner-data-structure https://riadhmnasri.fr/en/blog/spaced-repetition-leitner-data-structure Kortex, Kafkex, Vocably, Lingopack: four different apps, one revision engine. What makes this problem interesting to model. Sun, 05 Apr 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/stockfish-in-the-browser-what-wasm-changes https://riadhmnasri.fr/en/blog/stockfish-in-the-browser-what-wasm-changes On OpeningBook, chess analysis runs entirely client-side. What that actually implies, beyond the WASM buzzword. Sun, 01 Mar 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/event-driven-with-kafka-what-you-gain-and-lose https://riadhmnasri.fr/en/blog/event-driven-with-kafka-what-you-gain-and-lose Decoupling services through events solves real coupling problems, but introduces others that are less visible at first. Tue, 10 Feb 2026 00:00:00 GMT https://riadhmnasri.fr/en/blog/getting-started-learning-terraform https://riadhmnasri.fr/en/blog/getting-started-learning-terraform Writing a resource block is easy. What takes time to really understand is state, and why it's Terraform's actual subject. Thu, 15 Jan 2026 00:00:00 GMT