Notes, projects, and experiments by Filip Kunc.https://filipkunc.comhttps://filipkunc.com/posts/llm-serving-observabilityhttps://filipkunc.com/posts/llm-serving-observabilityvLLM, Prometheus and Jaeger on one desktop GPU: 32 parallel requests until the KV cache fills, and a tool-calling agent traced to the code it ran.Sun, 05 Jul 2026 00:00:00 GMThttps://filipkunc.com/posts/rust-kvm-oshttps://filipkunc.com/posts/rust-kvm-osBuilding a minimal hypervisor with kvm-ioctls and a no_std Rust kernel it boots straight into long mode, then giving it a screen, a mouse, a software rasterizer, and enough syscalls to run a real Linux binary.Thu, 02 Jul 2026 00:00:00 GMThttps://filipkunc.com/posts/datastar-shared-boardhttps://filipkunc.com/posts/datastar-shared-boardBuilding a live collaborative board with data-star over server-sent events, finding where real-time input hits a wall, and crossing it with the WebSocket prediction and interpolation games have used for years.Tue, 30 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/flutter-rust-hn-readerhttps://filipkunc.com/posts/flutter-rust-hn-readerHow a Flutter UI and a Rust core talk through flutter_rust_bridge: typed data, sync and async calls, and streams, built into a Hacker News reader.Sun, 21 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/testing-agents-skills-mcphttps://filipkunc.com/posts/testing-agents-skills-mcpAgents need proper context, and MCP and skills provide it. Verifying it actually works is the harder part, tested here with sandboxed Claude Code.Fri, 19 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/patching-esmhttps://filipkunc.com/posts/patching-esmA live AST explorer that runs the same import-rewriting transform two ways, oxc in Rust and Acorn in JavaScript, including source maps.Mon, 15 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/rts-flow-fieldshttps://filipkunc.com/posts/rts-flow-fieldsMoving thousands of units at once with one shared flow field instead of per-unit paths, simulated live in the browser with Rust and WASM.Fri, 12 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/text-renderinghttps://filipkunc.com/posts/text-renderingA text editor that renders glyph outlines on the GPU with HarfBuzz, benchmarked against canvas 2D and DOM text.Wed, 10 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/meshmakerhttps://filipkunc.com/posts/meshmakerMy 3D mesh editor, built since 2009 and ported to WebGL2 and WASM by AI.Mon, 08 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/native-node-addonshttps://filipkunc.com/posts/native-node-addonsThe same native compressor wrapped for Node four ways, with NaN, Node-API, napi.rs, and WebAssembly.Sun, 07 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/code-searchhttps://filipkunc.com/posts/code-searchSearching code fast with ripgrep, trigrams, and embeddings, benchmarked on the Node.js source.Fri, 05 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/header-only-libshttps://filipkunc.com/posts/header-only-libsMy favorite C and C++ header-only libraries.Wed, 03 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/cpp-data-raceshttps://filipkunc.com/posts/cpp-data-racesForcing C++ data races to show up on purpose, then fixing them with volatile, atomics, and mutexes. Plus a from-scratch allocator benchmark.Tue, 02 Jun 2026 00:00:00 GMThttps://filipkunc.com/posts/gpu-normalshttps://filipkunc.com/posts/gpu-normalsA WebGPU cloth sim that rebuilds a million mesh normals every frame, with one kernel ported across four GPU languages.Sat, 30 May 2026 00:00:00 GMThttps://filipkunc.com/posts/type-json-validatorhttps://filipkunc.com/posts/type-json-validatorTurn a plain TypeScript type into a live, in-browser JSON validator by walking it with the TypeScript Compiler API.Thu, 28 May 2026 00:00:00 GMThttps://filipkunc.com/posts/local-llm-arenahttps://filipkunc.com/posts/local-llm-arenaComparing small local models on a LeetCode-style task with deterministic unit tests as the judge.Sat, 23 May 2026 00:00:00 GMThttps://filipkunc.com/posts/monkey-patchinghttps://filipkunc.com/posts/monkey-patchingTour of techniques for modifying existing code at runtime.Wed, 20 May 2026 00:00:00 GMThttps://filipkunc.com/posts/work-lifehttps://filipkunc.com/posts/work-lifeA different way to look at my career than a bullet point CV.Wed, 20 May 2026 00:00:00 GMThttps://filipkunc.com/posts/old-stuffhttps://filipkunc.com/posts/old-stuffReviving my old projects via Claude, WebGL and WASM.Mon, 18 May 2026 00:00:00 GMThttps://filipkunc.com/posts/gemini-game-arthttps://filipkunc.com/posts/gemini-game-artUsing Gemini to generate game art assets, and the workflow around it.Sun, 17 May 2026 00:00:00 GMT