Writing on engineering practice, DevOps / SRE, and AI workflows.https://jimmychen.me/enhttps://jimmychen.me/en/blog/hello-site/https://jimmychen.me/en/blog/hello-site/The first post after migrating my personal site from VitePress to Astro 5: the architecture, the routing, and how posts get published.Fri, 24 Jul 2026 00:00:00 GMTMetahttps://jimmychen.me/en/blog/claude-code/https://jimmychen.me/en/blog/claude-code/Live DemoWed, 14 Jan 2026 00:00:00 GMTAIDevOpshttps://jimmychen.me/en/blog/netflix-great-flood/https://jimmychen.me/en/blog/netflix-great-flood/It's been a long time since I picked up a pen to write anything — and I never expected the thing to get me writing again would be my thoughts after watching The Great Flood.Sat, 10 Jan 2026 00:00:00 GMTScreenFilmhttps://jimmychen.me/en/blog/hhkb-type-s/https://jimmychen.me/en/blog/hhkb-type-s/A quick note: buying an HHKB had always been a life goal of mine, but I never thought I'd pull the trigger this soon. The layout really does take relearning, and then there's the price — 24,840 yen for a single keyboard.Tue, 25 Apr 2017 00:00:00 GMTReviewsKeyboardshttps://jimmychen.me/en/blog/leetcode-happy-number-no202/https://jimmychen.me/en/blog/leetcode-happy-number-no202/Write an algorithm to determine if a number is "happy".Fri, 22 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode-longest-substring-without/https://jimmychen.me/en/blog/leetcode-longest-substring-without/Given a string, find the length of the longest substring without repeating characters.Tue, 19 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/java-javamailgmailews-apiexchange/https://jimmychen.me/en/blog/java-javamailgmailews-apiexchange/Today I looked into how to send mail out from GMail using the Java Mail API, and from Exchange using the EWS API. I wrote some test code to share with you all.Fri, 15 Jul 2016 00:00:00 GMTJavahttps://jimmychen.me/en/blog/leetcode-add-two-numbers-linkedlist-no2/https://jimmychen.me/en/blog/leetcode-add-two-numbers-linkedlist-no2/You are given two linked lists representing two non-negative numbers.Thu, 14 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode-two-sum-no1/https://jimmychen.me/en/blog/leetcode-two-sum-no1/Given an array of integers, return indices of the two numbers such that they add up to a specific target.Wed, 13 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode-excel-sheet-column-number-no171/https://jimmychen.me/en/blog/leetcode-excel-sheet-column-number-no171/Related to question Excel Sheet Column Title Given a column title as appear in aTue, 12 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode-execel-sheet-column-title-no168/https://jimmychen.me/en/blog/leetcode-execel-sheet-column-title-no168/Given a positive integer, return its corresponding column title as appear in an Excel sheet.Mon, 11 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode-dungeon-game-no174/https://jimmychen.me/en/blog/leetcode-dungeon-game-no174/The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon.Fri, 08 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/leetcode/https://jimmychen.me/en/blog/leetcode/I recently discovered a great website called LeetCode. It has a huge collection of problems, most of them the kind that come up often in programming interviews—perfect for anyone job hunting who wants to practice, or for anyone who feels their technical foundation isn't strong enough and wants to shore it up.Fri, 08 Jul 2016 00:00:00 GMTAlgorithmshttps://jimmychen.me/en/blog/app/https://jimmychen.me/en/blog/app/This was my first time entering an app-building contest as part of a team, and I learned a lot. Here are some takeaways to share. First: if a team has no discussion or even arguments, it may mean nobody is really thinking hard.Thu, 19 May 2016 00:00:00 GMTSoftware Engineeringhttps://jimmychen.me/en/blog/30tdd/https://jimmychen.me/en/blog/30tdd/After finishing 'Getting Up to Speed with TDD in 30 Days', here are some of the takeaways I found most important, shared with you all.Mon, 11 Jan 2016 00:00:00 GMTSoftware Engineeringhttps://jimmychen.me/en/blog/blog-post-3/https://jimmychen.me/en/blog/blog-post-3/- The SOLID principles (SRP, OCP, LSP, ISP, DIP) - SRP (Single Responsibility) - Definition: a class should have only one reason to change.Mon, 11 Jan 2016 00:00:00 GMTSoftware Engineeringhttps://jimmychen.me/en/blog/tdd/https://jimmychen.me/en/blog/tdd/I've been digging into the testing side of software development lately, so here's a summary of where I currently stand on testing. If you think testing is nonsense, feel free to skip this post; and if you want to learn more about testing, here are some references.Mon, 28 Dec 2015 00:00:00 GMTSoftware Engineeringhttps://jimmychen.me/en/blog/linux-vs-windows/https://jimmychen.me/en/blog/linux-vs-windows/1. What is Linux?Sat, 03 Oct 2015 00:00:00 GMTLinuxhttps://jimmychen.me/en/blog/linuxlinux-basic-concept/https://jimmychen.me/en/blog/linuxlinux-basic-concept/1. The Linux Kernel: Shell/KDE/Application <- Kernel <- Hardware. Technically, Linux is just a kernel.Sat, 03 Oct 2015 00:00:00 GMTLinuxhttps://jimmychen.me/en/blog/centos-7-virtualbox/https://jimmychen.me/en/blog/centos-7-virtualbox/As the title says. You can also refer to these blog posts for the configuration. First, a quick note: if all you want is for the VM to reach the external network without connecting to the physical host, VirtualBox's default NAT already does the job.Sun, 13 Sep 2015 00:00:00 GMTLinuxhttps://jimmychen.me/en/blog/cloud9-java-runner/https://jimmychen.me/en/blog/cloud9-java-runner/Today I'll walk you through how to set up a Java Runner on Cloud9. You can also refer directly to the Cloud9 and Stack Overflow tutorials. First, let's create a new workspace.Sun, 13 Sep 2015 00:00:00 GMTCloud DevJavahttps://jimmychen.me/en/blog/virtualbox-ova/https://jimmychen.me/en/blog/virtualbox-ova/It's actually quite simple—here I'm just walking you through it once.Sun, 13 Sep 2015 00:00:00 GMTLinuxhttps://jimmychen.me/en/blog/codeanywherecentos-devboxjava/https://jimmychen.me/en/blog/codeanywherecentos-devboxjava/1. First sign up for a Codeanywhere account (obviously). 2. Spin up a CentOS DevBox (VM). 2.1 Right-click on DevBox and choose Add DevBox, as shown.Sun, 06 Sep 2015 00:00:00 GMTCloud DevJavahttps://jimmychen.me/en/blog/idecloud-ide/https://jimmychen.me/en/blog/idecloud-ide/Today I'll introduce a few of the more common cloud IDEs. Since there are more and more of them these days, I've picked the top few based on how convenient I found them for Java development and on the ratings from Slant (What is the best cloud IDE?).Sun, 06 Sep 2015 00:00:00 GMTCloud Devhttps://jimmychen.me/en/blog/koding/https://jimmychen.me/en/blog/koding/A quick note first: the Koding environment has a package manager called Koding Package Manager (kpm). In the guides below, whenever kpm is available it will be listed at the top.Sun, 06 Sep 2015 00:00:00 GMTCloud Devhttps://jimmychen.me/en/blog/blog-post_14/https://jimmychen.me/en/blog/blog-post_14/Elders often warn: don't wolf down your food.Tue, 15 Jul 2014 00:00:00 GMTLifehttps://jimmychen.me/en/blog/rt-n16tomato-by-shibbyopenssl-heartbleed/https://jimmychen.me/en/blog/rt-n16tomato-by-shibbyopenssl-heartbleed/First, let me explain what OpenSSL Heartbleed is. In OpenVPN's own words: "A vulnerability in OpenSSL, nicknamed Heartbleed, was published in April 2014." OpenVPN uses OpenSSL as its default crypto library, so it's affected too.Thu, 03 Jul 2014 00:00:00 GMTSecurityhttps://jimmychen.me/en/blog/blog-post/https://jimmychen.me/en/blog/blog-post/A friendly heads-up: the tuning pack was a loaner for testing from the vendor. That said, I've tried to stay as neutral as possible in writing up my impressions, so take them for what they're worth.Wed, 02 Jul 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/blog-post_30/https://jimmychen.me/en/blog/blog-post_30/This write-up is nearly three months overdue, XDD. Let's just call that stretch the burn-in time my new super tweeter needed, XDD. First, let me introduce the company SG Acoustic. Although the brand itself is only about three years old…Mon, 30 Jun 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/blog-post-4/https://jimmychen.me/en/blog/blog-post-4/I used to not really believe in fate. Lately, though, I've started to feel that fate really is a magical thing. Maybe a lot of things really do come down to fate. Buying and selling a bunch of stuff recently has made me feel this even more strongly.Tue, 10 Jun 2014 00:00:00 GMTLifehttps://jimmychen.me/en/blog/cute-hd/https://jimmychen.me/en/blog/cute-hd/This isn't an ad—just a piece written by someone who loves Firestone, so it may be a little biased. Feel free to skip if it's not your thing, and of course you're all welcome to join the discussion… @@ The older Supplier USB had a problem where it couldn't support the Raspberry Pi.Thu, 29 May 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/usb-audio-player-prousb-audio-recorder/https://jimmychen.me/en/blog/usb-audio-player-prousb-audio-recorder/Today let me write up my impressions of using USB Audio Player PRO / USB Audio Recorder PRO.Wed, 28 May 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/philips-a5-pro/https://jimmychen.me/en/blog/philips-a5-pro/As someone who owns both the Philips S2 and the Philips X1, it would be a lie to say I had no expectations for the A5 Pro that Philips has released in collaboration with Armin Van Buuren, XDMon, 26 May 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/blog-post-2/https://jimmychen.me/en/blog/blog-post-2/Haha, XDD blogs don't feel as popular as they used to. Social networks like FB have taken over, but I still think that if you have something long to say, a blog is still the more proper place for it.Sat, 24 May 2014 00:00:00 GMTLifehttps://jimmychen.me/en/blog/blog-post_24/https://jimmychen.me/en/blog/blog-post_24/The remarks below: moral crusaders, please skip.Sat, 24 May 2014 00:00:00 GMTLifehttps://jimmychen.me/en/blog/custom-cute/https://jimmychen.me/en/blog/custom-cute/The listening-impression parts come down to personal taste, so please bear with me—and discussion is very welcome. \=================================================Sat, 24 May 2014 00:00:00 GMTReviewsAudiohttps://jimmychen.me/en/blog/supplier-usbusb-hub30/https://jimmychen.me/en/blog/supplier-usbusb-hub30/By popular request, I ran this showdown, XDD. It was done with a Custom Cute + Supplier HD + Xiaomin 3 + Supplier AC + Philips X1 as the fixed setup, comparing the different combinations below.Sat, 24 May 2014 00:00:00 GMTReviewsAudio