Dev Note

2026

Jul 20, 2026 Dev Note

When Measurement Becomes the Goal: From Window Tax to PR Counts

I once wrote a small tool to count how many PRs I had contributed in a quarter, how many reviews I had left, and how many tickets I had closed, hoping to use the numbers to prove my output to my manager. My manager simply said performance is not judged by output alone. Only years later did I understand—when measurement becomes the goal, it is no longer a good measure. From Britain’s window tax and the Hanoi rat bounty to evaluating developers by PR count today, the mechanism is exactly the same.

Jul 4, 2026 Dev Note

Using Cloudflare Images for Image Storage and Transformation

Putting an image on a web page is the easiest thing in frontend. But doing it properly — resizing, generating every format, holding up under traffic — turns into a whole solution of its own. I ended up handing all of it to Cloudflare Images and keeping just one original.

Apr 6, 2026 Dev Note

Stop Using Access Keys Already

Access Keys are an easily overlooked security risk on AWS. Use OIDC with IAM Roles so GitHub Actions can securely access AWS resources without any secrets.

Apr 4, 2026 Dev Note

Database Primary Keys: AUTO_INCREMENT, UUID, and UUIDv7

Backend developers often have to decide on a primary key: auto increment or UUID? What about collisions? How much faster is UUIDv7 compared with created_at + index? After benchmarking 20 million rows and looking at the design trade-offs, this post gives you the answer.

2024

Nov 2, 2024 Dev Note

Sharing My Experience with Zeabur

Independent developers often choose platforms like Vercel for deploying their services. However, when more advanced requirements arise, such as database connections, Vercel can become less convenient. Additionally, the pricing of typical cloud service providers can be quite expensive for solo developers. In this article, I’ll share some insights on using Zeabur and highly recommend it to everyone!

2023

Sep 25, 2023 Dev Note

Keyboard Enthusiast's Guide - Firmware Edition

This article is part of the IT 2023 Ironman Competition: A Beginner's Guide to Keyboards - Firmware Edition.

Sep 25, 2023 Dev Note

A Brief Discussion on Japanese Electricity

This article is part of the IT 2023 Ironman competition: A Brief Discussion on Japanese Electricity.

Sep 24, 2023 Dev Note

Keyboard Enthusiast's Guide - Hardware Edition

This article is part of the IT 2023 Ironman Competition: Keyboard Enthusiast's Guide - Hardware Edition.

Sep 22, 2023 Dev Note

The Principle of Chargers

This article is part of the IT 2023 Ironman competition: The Principles of Chargers

Sep 21, 2023 Dev Note

### Journey into Analyzing Japanese Television Subtitles

This article is part of the IT 2023 Ironman series: An Exploration of Japanese TV Subtitles.

Sep 21, 2023 Dev Note

Driving Modern Society: Semiconductors (2)

This article is part of the IT 2023 Ironman Competition: Semiconductors Driving Modern Society (2)

Sep 20, 2023 Dev Note

The Less Common Networking Theories (1)

This article is part of the IT 2023 Ironman series: Lesser-Known Networking Theories (1)

Sep 20, 2023 Dev Note

The Lesser-Known Networking Theories (2)

This article is part of the IT 2023 Ironman Competition: Lesser-Known Networking Theories (2)

Sep 20, 2023 Dev Note

Semiconductors Driving Modern Society

This article is part of the IT 2023 Ironman series: Semiconductors Driving Modern Society (1)

Sep 17, 2023 Dev Note

JPG 與離散餘弦轉換

本篇為 IT 2023 鐵人賽文章：JPG 與離散餘弦轉換

Sep 15, 2023 Dev Note

逆矩陣沒有想像中的好

本篇為 IT 2023 鐵人賽文章：逆矩陣沒有想像中的好

Sep 15, 2023 Dev Note

Seam Carving – 讓圖片不成比例地縮小

本篇為 IT 2023 鐵人賽文章：Seam Carving – 讓圖片不成比例地縮小

Sep 14, 2023 Dev Note

與程式有關的遊戲三選 (2)

本篇為 IT 2023 鐵人賽文章：與程式有關的遊戲三選 (2)

Sep 14, 2023 Dev Note

奇異值分解

本篇為 IT 2023 鐵人賽文章：奇異值分解

Sep 13, 2023 Dev Note

數值穩定與誤差

本篇為 IT 2023 鐵人賽文章：數值穩定與誤差

Sep 12, 2023 Dev Note

興趣使然的研究之旅

本篇為 IT 2023 鐵人賽文章：興趣使然的研究之旅

Feb 2, 2023 Dev Note

2022 Advent Of Code (day9) - Rope Bridge

After reading the description, the more challenging part is how to determine the movement of the tail and the adjacency check. Here, I simply used a simple 2D vector approach.

2022

Mar 20, 2022 Dev Note

String Processing in the C Language

In the C language, you can use strlen to obtain the length of a string. However, there are certain things to be aware of when using it.

Feb 27, 2022 Dev Note

ATOMIC_BLOCK in avr-libc

Even in microcontrollers, there are various interrupts that can be used, so the execution of the code may be interrupted. This can be managed by using atomic operations.

Jan 13, 2022 Dev Note

How to Boost Development Efficiency with VSCodeVim

After switching to the HHKB keyboard, I no longer have arrow keys. When editing text, I naturally try to minimize the use of arrow keys. Influenced by various external factors, I started learning Vim and found it to be quite useful, especially when paired with VSCode. Here, I would like to share some insights and tips with those who are interested.

2021

Dec 7, 2021 Dev Note

Amazon Polly - Text-to-Speech, the effect is very remarkable.

Polly is one of the services on the Amazon cloud platform that can convert text into speech. Although text-to-speech is not uncommon, Polly can generate natural-sounding voices based on sentence structures, which is a great boon for language learners. In addition, it has a wide range of applications, such as converting subtitles into speech, scripts, narrations, dialogues, and even the possibility of using Polly to record podcasts directly.

Nov 24, 2021 Dev Note

Investigation on USB Applications with AVR

The key point of using AVR for USB is whether the chip itself has built-in USB support. Currently, only ATmega32u4 is still in production, but it may also be difficult to obtain due to semiconductor supply shortages.

Nov 22, 2021 Dev Note

Raspberry Pi Pico PIO Exploration

In early 2021, Raspberry Pi released the pico microcontroller, which is quite affordable at just over 100 Taiwanese dollars. One interesting feature of it is PIO, which allows the implementation of different communication protocols using specialized assembly language and architecture without consuming the resources of the main processor.

Oct 27, 2021 Dev Note

tmux Shortcut Key Notes

I have always been accustomed to using the terminal by directly switching tabs through the tab feature of iTerm2. There is nothing wrong with doing so, but ever since I discovered the advantages of `tmux`, I have moved all my terminal operations to tmux.

Aug 11, 2021 Dev Note

Why is the mental model crucial for learning programming languages?

Mental models refer to our cognitive processes of how we anticipate the development of things or how things will operate. It may sound a bit academic. For example, when we see a button UI on the screen, we expect that this UI is clickable and that clicking it may trigger a series of events. Therefore, when users find that this UI is not as expected, they may feel confused.

May 7, 2021 Dev Note

Setting up a server in a company is not as easy as I imagined.

In this project development, the planning team had a requirement to dynamically update the data by calling APIs on the previously static Landing Page. Additionally, as the interactivity of the page increased, the original combination of pug+webpack+jQuery for static pages was no longer sufficient. Therefore, we introduced next.js in the development of the new version and embarked on a journey of server setup and troubleshooting.

2020

Nov 29, 2020 Dev Note

How I Improve the development process

The first few months happened to be time for large features to come online. Before continuing with another project, there is not much development, mainly to fix some small bugs and improve existing features. And because development is not that compact, there is more time this season to focus on improving the process.

Oct 25, 2020 Dev Note

Learn from Kotlin: Kotlin DSL and Annotation

Recently with Kotlin developed a small tool to manage daily tasks, mainly hope that colleagues in Backend can also be maintained together, the other is to learn a new language can always get some new excitement and ideas, as well as many Java and JVM God in the company take advantage of digging treasure.

Sep 8, 2020 Dev Note

Creating an Air Quality Monitoring Application with Arduino and ESP32 (4) - WiFi

Our goal this time is to bring the whole idea into place, so I purchased a ESP32 development version that already has built-in WiFi and Bluetooth to develop!

Jul 30, 2020 Dev Note

Create an Air Quality Monitoring Application with Arduino and ESP32 (3) - Arduino

This will talk about some mines on Arduino and language unfamiliar and stepped on

Jul 24, 2020 Dev Note

Creating an Air Quality Monitoring Application with Arduino and ESP32 (2) - Data Communication UART

Among the networks, the most common one is the TCP protocol. To ensure the accuracy of data transmission, we need a series of mechanisms to ensure that the data is accurate and that both parties can receive messages. You need to do similar things in the hardware.

Jul 21, 2020 Dev Note

Implementing Air Quality Monitoring Applications with Arduino and ESP32 (1) - Introduction to Sensors

Create air quality monitoring applications with arduino, esp32, sensors! Although it is air quality, it is only the carbon dioxide concentration and temperature and humidity monitoring. If there is a sensor, it is not too much of a problem.

Jul 8, 2020 Dev Note

The Journey to Data Science from Scratch

Jun 12, 2020 Dev Note

Automatically upload images in the Typora editor

Typora is my favorite markdown text editor. But there is an annoyance when using the picture upload. Because Typora will only put the path of the picture into the markdown which...

May 1, 2020 Dev Note

How to bring Github Actions to your project

In the past, the team may have to spend some time discussing (quarreling) CI solutions, such as CircleCI, DroneCI, Jenkins, etc., but as long as the team has the code hosted on Github, it is easy to integrate CI with Github, although it can't be said to be a Pantera, killer. But in general to run tests, and even push and deploy scenarios like I think are quite simple to achieve, let's introduce below.

Apr 27, 2020 Dev Note

How to record video using XCode Simulator

Screen recording is a good trouble, so check if you can use simulator to record, really can

Mar 28, 2020 Dev Note

xxd easy to use way record

xxd is a linux tool that can look at binary files

Feb 3, 2020 Dev Note

Some ideas on writing tests (front-end)

Writing tests has always been an indispensable part of software engineering，But how to write for a long time seems to find a bug will still run out，QA Issue still as much?

2019

Dec 11, 2019 Dev Note

How to read SUICA information with CorenFC

iOS 11.0 can read and write NFC Tag through CorenFC, but it can't read information such as IC cards. IC cards can only be read by iOS device...

Oct 23, 2019 Dev Note

How to read SUICA information with CoreNFC

iOS 11.0 can read and write NFC Tag through CoreNFC , but it can't read information such as IC cards. IC cards can only be read by iOS device…

Apr 10, 2019 Dev Note

Setting Environment Variables for a Project - VIPER

About a few months ago, I wrote an article on how to set environment variables in golang, and setting environment variables gracefully is a very important thing, so I wrote a simple function to do it. The initial consideration is very simple. If a corresponding config file is provided, use os.setenv to set the key/value inside. After that throughout the app...

Apr 1, 2019 Dev Note

Default value in Golang and zero value

In golang which, if there is no assignment at initialization, it will use zero value. However, over time, we will find that if zero value is replaced each time, we would not know whether the user did not enter a value that resulted in zero value, or did the user originally enter a zero value? At this time because of Email, Name...

Mar 30, 2019 Dev Note

How to collect and centralize logs in golang app

This article is a summary of How to collect, standardize, and centralize Golang logs | Datadog. There are usually a few points to note when using log: the log is passed as a parameter, you need to use the log to pass parameters into the unified context...

Mar 29, 2019 Dev Note

Golang Notes — Type Assertion

In golang, for the type of interface {}, you can make type determination to assume that the interface is a type, so that you can manipulate the methods in that type. This code can make the original interface...

Mar 27, 2019 Dev Note

Introduction to Goworker — Implementing Workers with Redis

Recently, projects have been moving from Ruby On Rails to golang, except for one thing you want to practice writing to see how ugly syntax feels, on the one hand, to feel the power of golang and how to organize your own code without an existing framework. Today is the goworker. He will look at the reason is to search for go worker...

Feb 21, 2019 Dev Note

Remember a debug process — connection

About the last few months, my google chrome has been somehow connection refusal. Sometimes there are web pages that just can't open but work on other devices. Although it is strange, it may be a problem with the server configuration, and there is no trouble, so continue to use it. Set custom...

Jan 15, 2019 Dev Note

How to handle connection lost in Go?

I looked at the popular sql packages now and found that almost none of the functions can be used to jump an error when connection is lost in real time. For example: nodejs mysql which, we can use connection.on ('error') to listen for errors. But in golang...

2018

Sep 3, 2018 Dev Note

[golang notes] How to set environment variables for your project

We often need to switch between different environments when developing a project, so we often set different environment variables. However, if you write directly to the program every time it is too cumbersome, if you can pass in the environment variables dynamically, you can reduce a lot of unnecessary changes, and the program is relatively clean. Flag can generally be used in golang flag this package...

Aug 15, 2018 Dev Note

Difference between make and new

In golang there are two reserved words make and new, but also the beginning of learning golang easy to confuse place, here to make a simple note. new new can be used to initialize the generic and return the storage address. So we usually use pointer variables to pick up new types. In particular, it should be noted that new will automatically use zeroed value...

Jan 1, 2018 Dev Note

How to Code Review

As a front-end engineer, the team is usually the person who sends pull requests the most often. In order to make your PR easier to test, and to make it easier to review the reviewer, a few considerations have been summarized. The pull request describes the purpose of this pull request. For example: fix layout...

2017

Dec 13, 2017 Dev Note

PostgreSQL Notes — INDEX

In the database, in order to improve query efficiency, the database can speed up query efficiency by creating indexes when the data is large. This article discusses the index of PostgreSQL. In most cases, using the syntax of `CREATE INDEX` directly can handle common development scenarios, there are many different types of index types available in PostgreSQL.

Nov 10, 2017 Dev Note

Uploading Medium Articles with AWS Lambda

Medium does not support code block editing itself, although I don't know the reason behind it (perhaps the engineer is not the main customer), so if you want to highlight the code, one way is to paste the image directly, paste it on the gist and then embed it

Nov 10, 2017 Dev Note

Better Express error

Better-Express-Error When developing express, if an error is encountered, it is usually printed directly on the error page, or directly directed to a 404, 500 page in the production side. Although there is nothing worth mentioning, but really, see this kind of page, will you feel happy? default error...

Jul 18, 2017 Dev Note

Talking about PCA and T-Sne in Reduction Methods

In machine learning, if there are too many features, it can cause problems, such as overfitting...

Mar 1, 2017 Dev Note

Rails app automation - hubot vs heaven

The current company is running the cap staging deploy command directly on the local terminal. Capistrano is very convenient as a tool for automatic deployment, but inevitably encounter several problems: not everyone on the team has the same environment everyone is deploying, as a result what branch is now on staging...

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Dev Note

2026

When Measurement Becomes the Goal: From Window Tax to PR Counts

Using Cloudflare Images for Image Storage and Transformation

Stop Using Access Keys Already

Database Primary Keys: AUTO_INCREMENT, UUID, and UUIDv7

2024

Sharing My Experience with Zeabur

2023

Keyboard Enthusiast's Guide - Firmware Edition

A Brief Discussion on Japanese Electricity

Keyboard Enthusiast's Guide - Hardware Edition

The Principle of Chargers

### Journey into Analyzing Japanese Television Subtitles

Driving Modern Society: Semiconductors (2)

The Less Common Networking Theories (1)

The Lesser-Known Networking Theories (2)

Semiconductors Driving Modern Society

JPG 與離散餘弦轉換

逆矩陣沒有想像中的好

Seam Carving – 讓圖片不成比例地縮小

與程式有關的遊戲三選 (2)

奇異值分解

數值穩定與誤差

興趣使然的研究之旅

2022 Advent Of Code (day9) - Rope Bridge

2022

String Processing in the C Language

ATOMIC_BLOCK in avr-libc

How to Boost Development Efficiency with VSCodeVim

2021

Amazon Polly - Text-to-Speech, the effect is very remarkable.

Investigation on USB Applications with AVR

Raspberry Pi Pico PIO Exploration

tmux Shortcut Key Notes

Why is the mental model crucial for learning programming languages?

Setting up a server in a company is not as easy as I imagined.

2020

How I Improve the development process

Learn from Kotlin: Kotlin DSL and Annotation

Creating an Air Quality Monitoring Application with Arduino and ESP32 (4) - WiFi

Create an Air Quality Monitoring Application with Arduino and ESP32 (3) - Arduino

Creating an Air Quality Monitoring Application with Arduino and ESP32 (2) - Data Communication UART

Implementing Air Quality Monitoring Applications with Arduino and ESP32 (1) - Introduction to Sensors

The Journey to Data Science from Scratch

Automatically upload images in the Typora editor

How to bring Github Actions to your project

How to record video using XCode Simulator

xxd easy to use way record

Some ideas on writing tests (front-end)

2019

How to read SUICA information with CorenFC

How to read SUICA information with CoreNFC

Setting Environment Variables for a Project - VIPER

Default value in Golang and zero value

How to collect and centralize logs in golang app

Golang Notes — Type Assertion

Introduction to Goworker — Implementing Workers with Redis

Remember a debug process — connection

How to handle connection lost in Go?

2018

[golang notes] How to set environment variables for your project

Difference between make and new

How to Code Review

2017

PostgreSQL Notes — INDEX

Uploading Medium Articles with AWS Lambda

Better Express error

Talking about PCA and T-Sne in Reduction Methods

Rails app automation - hubot vs heaven