MDT - Personal site

BMI calculator

Mon, 01 Jan 0001 00:00:00 +0000

Adult BMI is weight in kilograms divided by height in metres squared. It is a population screen, not a diagnosis. It does not know muscle, bone, pregnancy, or where fat sits.

Sleep pattern check

Mon, 01 Jan 0001 00:00:00 +0000

Think about the last two weeks, not a single bad night. This is a snapshot of pattern, not a sleep-disorder diagnosis.

Stress load check

Mon, 01 Jan 0001 00:00:00 +0000

Answer for the last two weeks. High scores mean the load is heavy right now. They do not name a condition.

Energy and recovery check

Mon, 01 Jan 0001 00:00:00 +0000

Use this when days feel flat or you cannot tell if you are tired or emptied. It is a self-check, not a clinical scale.

Liveness is not health

Fri, 11 Sep 2026 17:20:00 +0330

The worst Kubernetes outage I keep seeing is not a node dying. It is a slow database, a liveness probe that talks to that database, and a cluster that then kills every pod that was still doing useful work.

Liveness does not mean “the app is healthy.” It means “this process is so stuck that Kubernetes should shoot it.” If you point that gun at a dependency, you will shoot the fleet.

Spring @Transactional does not mean what you think

Fri, 11 Sep 2026 17:10:00 +0330

In review I still see @Transactional used as a blessing: put it on a method, and the database will behave. It will not. Spring starts a transaction when a proxy intercepts an incoming call. If the call never hits the proxy, you have no transaction, no rollback, and a very confusing production bug.

What I believed → what I do now

I used to sprinkle @Transactional on every service method “to be safe.” I now put it on the one method that is the use-case boundary, I write a test that proves rollback, and I treat same-class private calls as a smell.

Java, Spring, Kubernetes

Fri, 11 Sep 2026 17:00:00 +0330

A map of how I actually run backend software: Java on the JVM, Spring as the application layer, Kubernetes as the place it lives. Start here, then open the note that matches the problem in front of you.

This is not a tutorial index. It is the order I would walk a teammate through after an incident.

If you are new here

Spring @Transactional does not mean what you think — where transactions actually start, and why a method calling another method on this silently does nothing.
Liveness is not health — the Kubernetes outage that looks like a crash loop but started as a slow dependency.
Reliability lessons from SQLite — why a tool that solves more problems than it creates stays in production.

The Java course is the longer path if you want to write this stack with me, not only read about it.

Reliability Lessons From SQLite

Fri, 28 Aug 2026 10:56:00 +0330

Talk from SSW 2026.

Takeaways

SQLite is used so much because it solves more problems than it creates.

Notes

DO-178B Software considerations in Airbone Systems and Equipment Certification

it leads to create Fossil: Better Project Management MC/DC

Example: video note

Fri, 28 Aug 2026 10:00:00 +0330

This is a starter video note. Copy it, or delete it once you add your own.

Use note_type = "video" and put the YouTube URL in source so the video embeds at the top. Headings like 12:40 make timestamped notes easy to scan.

Takeaways

The browser event loop is a queue: JavaScript runs one thing at a time, then picks the next callback.
Rendering and I/O are not the same queue as your JS callbacks.
setTimeout(fn, 0) does not run immediately; it waits until the current stack is clear.

Notes

01:15 — Call stack

JS is single-threaded. Each function call is pushed onto the stack and popped when it returns.

AI agents

Fri, 28 Aug 2026 00:00:00 +0000

How to design agents that use tools, remember just enough context, and do useful work against real systems — not a chatbot demo that falls apart on the second step.

I will call you after you register so we can check background (some programming helps a lot) and pick a schedule.

Who it is for

You have written some code (Python or Java is enough). You have used ChatGPT or similar and want to go past “type a prompt.” You do not need a machine-learning PhD.

Java: beginner to advanced

Fri, 28 Aug 2026 00:00:00 +0000

A practical Java path for people who want to write backend software, not only pass a syntax quiz. There are two tracks. You can start at the beginning, jump to the advanced track if you already write Java, or do both.

I will call you after you register. We pick a track, a schedule, and whether the group is a fit.

Who it is for

Beginner track — you can use a computer comfortably, and you want a first real programming language. No Java required.

Example: book note

Thu, 27 Aug 2026 10:00:00 +0330

This is a starter book note. Copy it, or delete it once you add your own.

Use note_type = "book", creator for the author, and one heading per chapter. Set status to in-progress while you are still reading.

Takeaways

Reliability, scalability, and maintainability are the three reasons we bother with data systems.
There is no single storage engine that is best for every access pattern.
Replication and partitioning are separate problems; most systems need both.

Chapter 1 — Reliable, Scalable, and Maintainable Applications

Reliability means the system keeps working when things go wrong, not only in the happy path.

Latest Gold Price Snapshot

Fri, 26 Jun 2026 20:30:00 +0330

Latest Gold Price Snapshot

As of June 26, 2026, front-month COMEX gold for June delivery settled at $4,078.70 per troy ounce.

Gold prices move throughout each trading day, so this post is a simple sample snapshot rather than live pricing. The June 26 move left gold higher on the day but lower for the week, reflecting a volatile stretch for precious metals.

Source: Dow Jones Market Data via The Wall Street Journal

First Post

Fri, 17 Jan 2025 16:17:40 +0330

Auto generated Podcast!

Welcome to my first blog post! In this post, I’ve shared the podcast generated by NotebookLM exploring the book “The Professional Scrum Team”.

If you’re curious to hear what it sounds like, you can listen to the podcast below. You can also Download it here.

0:00 / 0:00

About me

Fri, 17 Jan 2025 16:17:19 +0330

Log in

Mon, 01 Jan 0001 00:00:00 +0000

Prices

Mon, 01 Jan 0001 00:00:00 +0000

US dollars per troy ounce. Gold and silver are snapshots from goldprice.org, captured about once an hour — not a live tick, and not investment advice. The chart shows percent change so both metals fit in one view.