https://wid-blog.pages.dev/en/Recent content on wid's blogHugoenSun, 12 Apr 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/devenv/claude-code-config-layers/Sun, 12 Apr 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/devenv/claude-code-config-layers/settings.json, CLAUDE.md, slash commands, subagents, hooks. Claude Code&rsquo;s customization surface settles into four layers once you pick one axis: when does each one step in?https://wid-blog.pages.dev/en/posts/tech/devenv/macos-dev-environment/Sat, 11 Apr 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/devenv/macos-dev-environment/alacritty + tmux + nvim + zsh + Claude Code, all in a single screen. A dotfiles repo that reproduces the whole thing with one line of setup.sh.https://wid-blog.pages.dev/en/posts/career/dable/starting-sabbatical/Tue, 07 Apr 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/career/dable/starting-sabbatical/A good engineer isn&rsquo;t someone who knows technology well, but someone who can share that knowledge with their team.https://wid-blog.pages.dev/en/posts/career/dable/dsp-fallback-ctr-ml-lifecycle/Sun, 01 Mar 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/career/dable/dsp-fallback-ctr-ml-lifecycle/Building my first ML Lifecycle — a three-tier architecture for DSP Fallback CTR prediction — as a backend engineer without an AI background. The technical decisions I made, and what I learned through running it.https://wid-blog.pages.dev/en/posts/tech/ml/mlflow/Tue, 24 Feb 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/ml/mlflow/Which slot of the ML lifecycle each MLflow component fills, and which pieces a lightweight team can pick.https://wid-blog.pages.dev/en/posts/tech/ml/model-training-frameworks/Sun, 15 Feb 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/ml/model-training-frameworks/sklearn and ONNX aren&rsquo;t competing at the same layer. Once you separate their roles, the real question becomes &lsquo;do I need an ONNX layer at all?&rsquo;https://wid-blog.pages.dev/en/posts/tech/ml/logistic-regression/Sat, 07 Feb 2026 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/ml/logistic-regression/The structure and characteristics of Logistic Regression, and why an old model still holds the baseline position in CTR prediction.https://wid-blog.pages.dev/en/posts/career/personal/concurrency-go-retrospective/Wed, 03 Apr 2024 00:00:00 +0000https://wid-blog.pages.dev/en/posts/career/personal/concurrency-go-retrospective/A record of implementing and benchmarking three Go concurrency patterns — mutex, channel, and lock-free — to build hands-on understanding.https://wid-blog.pages.dev/en/posts/tech/language/go-concurrency-model/Wed, 03 Apr 2024 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/language/go-concurrency-model/Go&rsquo;s concurrency model builds on CSP, providing Goroutines and Channels as core tools. An overview of how each works and when to choose what.https://wid-blog.pages.dev/en/posts/career/personal/chat-services-retrospective/Sun, 31 Mar 2024 00:00:00 +0000https://wid-blog.pages.dev/en/posts/career/personal/chat-services-retrospective/A record of designing and building a chat system as a personal project to gain hands-on experience with Kafka and Hexagonal Architecture.https://wid-blog.pages.dev/en/posts/tech/infra/kafka-fundamentals-kraft/Thu, 22 Feb 2024 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/infra/kafka-fundamentals-kraft/Core Kafka concepts (topics, partitions, consumer groups, replication) and the background behind KRaft mode, which removes the ZooKeeper dependency.https://wid-blog.pages.dev/en/posts/tech/architecture/go-hexagonal-architecture/Wed, 21 Feb 2024 00:00:00 +0000https://wid-blog.pages.dev/en/posts/tech/architecture/go-hexagonal-architecture/Core concepts of Hexagonal Architecture and its idiomatic implementation in Go using implicit interfaces and package structure for dependency direction control.https://wid-blog.pages.dev/en/posts/career/personal/rust-server-retrospective/Sun, 13 Mar 2022 00:00:00 +0000https://wid-blog.pages.dev/en/posts/career/personal/rust-server-retrospective/A record of implementing the multithreaded HTTP server from Rust Book Chapter 20, experiencing how ownership and concurrency safety are enforced at the type level.https://wid-blog.pages.dev/en/about/Mon, 01 Jan 0001 00:00:00 +0000https://wid-blog.pages.dev/en/about/<p>Backend engineer. Writing about technology and lessons learned along the way.</p>