Everything is relative in term of speed. Speed decides and wins. Internet changed the speed of distributing information. AI changes the speed of everything. Speed does not care your opinions. Speed decides the required skills. Think of driving a car going around in the city, sigh-seeing vs driving on a high way or F1. I used to think u...

I trained in minimal shoes for a few years. I can run barefoot for a reasonable surface and distance. I ran a marathon in Sandals. I ran barefoot on the dust and grass in childhood. There are cushion shoes for runners. There are debates of which types are healthy. Cushion shoes are constantly evolving. Some people are enjoying barefoot...

We debate as if Software is ONE thing. There are CLI applications that run on local computers serving their owner. There are system applications that control devices. There are business applications that help people managing information, accounting, workflow, ... There are applications that are supposed to live decades. Databases live ...

When you run, there are a huge different between slow and fast, between jogger and sprinter. The load, the impact, ... When you drive cars, city road and high way, they are not the same. The speed changes everything under the Sun. The faster you go, the more detail you have to care, the detail matters with speed. AI Agents change the s...

I have been writing code for 20 years; have been running teams to build software for over 10 years. Enough time to build certain skills and opinions. The opinions of: • How to build a stable software • How to run the team and structure the workflow • How to communicate Enough to run a team of 10 developers working on various projects. ...

GraphQL is a protocol. In the Web API world, there are REST and GraphQL among others such as JSON API. It is a way of expressing resources and capacities to consumers. Hot Chocolate is a framework (library) that implements GraphQL for .NET. It is a great one. I like its design and easy of use. Fantastic framework for .NET. EFCore is OR...

How can a solution be correct and INCORRECT and DANGEROUS at the same time? A pull request is a small piece in the whole codebase; hence the story must connect things. The description is a story.

A scene in Gods of Egypt when a soul is about to send to the afterlife, “Step forward, What do you offer?” Back then in the story, Gold represents for value that one can offer. I thought about it. Why was it the only question? They did not ask: Who are you? What have you done? What will you do? ... It seems none of them matter. When co...

I want to know that felling. Strong enough to press kettlebell half my weight overhead. Fast enough to run marathon at pace 5:00 minutes/km without gassing out. They are achievable and only I can do it for me. The journey is the reward. The accomplishment is the moment.

In the evening, "I will wake up at 5:00AM and train" - self-talk. Alarm rings, 5:00AM morning, I want to sleep. Why do I train? I am lacking sleep. Wake up anyway, 5:30AM (ish) out the door and move my legs. Walk, Jog, Run. Eventually, Run. 45 minutes later, finish the run. Feel great. Repeat.

I remember a saying "Information is power." Back then about 2 decades ago or less, it was hard to get information. In school, we depended on paper books. Everyone understood that books meant paper. Nowadays, concepts are blur, mixed and at the mercy of the internet. They were limited and expensive. To get information, we had to ask peo...

The system has been in production for 6 years. Recently, it was upgraded to .NET10. All related NuGet packages were upgraded too. A support ticket came in. Users experienced an error message occasionally. A search in the Application Insights showed: And the exception trace: at System.ThrowHelper.ThrowInvalidOperationException_Concurren...

Developers can read and understand code. They can extract meaning and flow by reading code. However, reading and understanding a long writing is limited. In software development, there is business analysis and other roles to support them. They break requirements down into smaller chunks that developers can comprehend. The process works...

It is hard to measure it. Yet, it is there. Everyone feels it. It is a wonderful thing. When reading a book, the paper, the ink, the shape are visible. They are things. Taste happens. When holding a book, it appears in our minds as a whole. Taste happens. When writing code, reading line by line, feeling something misaligned, something ...

Iron Man Tony Stark with super amor. Under the mighty amor is human flesh and bones and joins. For years, I could not explain how he performs with the speed of the machine. We have AI in reality. There are agents. Unfortunately, we are not Iron Man, not in Marvel. How could our brain operate and/or catch up with AI?

He walked. His mind wondered. What has he become? Who sold him that plan? And how long has he been on the plan? After 30 minutes, he even did not know what that plan was. The power of walking alone. At first, the resistant, the self inquiry questions. It was boring. After a few days, those questions disappeared. Another series came up....

A man sitting on the side road with cigarette and phone. A woman running a round the blocks. She does it every night. A girl taking her dog for a walk. A man pulling a tyre. A few couples walking hands in hands. Some rushed after a late work. A peaceful night. Almost every night since one started noticing it.

Take your time. Everything takes time. Good thing takes longer time. Great thing takes a great deal of time. Perception of time is interesting. The same 1 hour passed. It might feel fast or slow depending on the time of the day, the mood, the physical condition. Waiting in the red light, 30s feels like hours. It all takes time. TAKE YO...

Fear of overstride, hammering the road. Fear of injury. Fear of being slow to others. Fear of being seen lazy. Fear of not train enough. Fear of ... well of ... All are imagined. They feel real. The body is tensed or sluggish. No rhyme no soul in every step. Just run.

THE FEAR COSTS THE SOUL. MOST OF THEM ARE UNREAL. THEY COME. SAY HI! AND SILIENT.

When I started my software engineer career, layered structure was the default. There were Api, Application, Infrastructure, Abstraction, Data Access projects. There were also unit test and integration test projects. When I heard about Vertical/Feature/Slice Architecture, It reasoned well with me. I liked it immediately. Since then, it ...

I used Claude Code to build Agent Skills. A planner skill, an implementer skill, ... Took a few iterations to get the basic. They worked. Sometimes, I revisisted to improve them. The three questions for Agent: 1. What can we improve? 2. Which parts are not good? 3. Which parts are not useful? The first question always generates a lot o...

Two weeks ago, I built a CLI application that allows me to register my training, very customized to me. It then connects to my Strava and acts as an AI Running Coach. The command to log a strength training session It has a fixed "weight". Which is not accurate for my training. Simple and Sinister program has different weights for Swing...

I were working on a new project. The critical part of any project I have been working on is the Data Model. The data model evolves over time. There are a few steps in our working style: 1. Define the minimal data model to work with at the time. 2. Database schema. We use EF Core with relational database. Schema is auto generated. 3. Ne...

With a large codebase for over 7 years, the unit tests carries a legacy. It has been designed and built with technologies then and with special purposes: to run both Unit Tests and Integration Tests with the shared test code. In short, the actual tests are used for both scenarios. We dropped the Integration Tests a few years ago. The r...

I built an AI Coach https://world.hey.com/thaianhduc/the-new-way-of-building-apps-9b4c36d4 as an experiment to explore Claude Code. Today, I chatted with it how is my training looking so far? Pretty cool. The cool thing is that I can build it with my personal philosophies, custom training. For example, I can add some context in my ques...

I am a fan of Slice Architecture for years. The basic idea is that an application is sliced vertically. The goal is to keep features separated as much as possible. Isolation is the key benefit. There is still Layers with Api, Application, Core/Domain. Recently with Claude Code, I asked it to explore one feature in the project. The CLAU...

I have logged my training activities on Strava. I wanted to build an app, preferably CLI type, to connect to my Strava and analyze them. And do a few other things. There are many things to consider for such an app. And sometimes, we might not even know where to start. 1. What interfaces does it support? for example: load, analyze, plan...

For two decades, I did not pay attention to creating or using PowerShell (PS) scripts/commands. I was not in the terminal, script mode. My time are in Visual Studio, Rider, or Visual Studio Code. Some short of IDE. I have changed since I started Claude Code. More time in terminal. Started to enjoy the command line (CLI) world. I like b...

Claude Code is an Agentic Loop agent. It will figure things out on its own given the task and context. We should avoid giving it concrete instructions of how to do things. Our focus should be expressing our intent as clear as possible to Claude Code, giving it enough context. There is no hard rule of how much is enough. It is context d...