💻 Software engineer at Google ☕ The Coder Cafe newsletter https://thecoder.cafe 📖 100 Go Mistakes author https://100go.co/book 🏠 https://teivah.dev 改善https://bsky.app/profile/teivah.devhttps://bsky.app/profile/teivah.dev/post/3ml75gcc5vs2y"The cache didn't change. The code didn't change. The system grew around the cache, and the cache quietly became load-bearing." https://read.thecoder.cafe/p/cache-use-cases06 May 2026 16:42 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3ml75gcc5vs2yhttps://bsky.app/profile/teivah.dev/post/3mknfbmc4es2gHow Linux 7.0 Broke PostgreSQL: The Preemption Regression Explained https://read.thecoder.cafe/p/linux-broke-postgresql29 Apr 2026 15:14 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3mknfbmc4es2ghttps://bsky.app/profile/teivah.dev/post/3mkarxjsc322h6,500+ and growing! To celebrate with the community of The Coder Cafe, we just opened a book club! 📚 We'll be reading Designing Data-Intensive Applications (2nd ed) together. A huge thank you to @oreilly.bsky.social for giving away 3 free copies of the book! https://read.thecoder.cafe/p/reading-room-open24 Apr 2026 14:57 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3mkarxjsc322hhttps://bsky.app/profile/teivah.dev/post/3mk4bm5zpos2tNew post ☕️ Systems Thinking Explained: From Events to Systemic Structures https://read.thecoder.cafe/p/systems-thinking22 Apr 2026 19:53 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3mk4bm5zpos2thttps://bsky.app/profile/teivah.dev/post/3mjjnzg5uf22xDid you know that every time you save a file to an SSD, quantum physics is involved? ⚛️ New post: How an SSD Works: An Introduction to Quantum Physics https://read.thecoder.cafe/p/how-an-ssd-works15 Apr 2026 10:15 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3mjjnzg5uf22xhttps://bsky.app/profile/teivah.dev/post/3mbtuc7wk5s2y"The cold start problem is a chicken-and-egg problem: no users without value, no value without users." https://read.thecoder.cafe/p/cold-start-problem07 Jan 2026 16:12 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3mbtuc7wk5s2yhttps://bsky.app/profile/teivah.dev/post/3makwz3ulhs2qBuild Your Own Key-Value Storage Engine: Week 4 (Written in collaboration with @scylladb.com) This week, we explore how to handle deletes and compaction in LSM trees. https://read.thecoder.cafe/p/build-your-own-kv-engine-422 Dec 2025 09:42 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3makwz3ulhs2qhttps://bsky.app/profile/teivah.dev/post/3m76gt6mwlk2yBuild Your Own Key-Value Storage Engine—Week 3: Durability with Write-Ahead Logging (Written in collaboration with @scylladb.com ) This week, we explore how to make data durable with the use of a WAL. https://read.thecoder.cafe/p/build-your-own-kv-engine-304 Dec 2025 16:55 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m76gt6mwlk2yhttps://bsky.app/profile/teivah.dev/post/3m6otc3ghsc2eLinus Torvalds vs. Ambiguous Abstractions https://read.thecoder.cafe/p/linus-torvalds-ambiguous-abstractions28 Nov 2025 11:55 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m6otc3ghsc2ehttps://bsky.app/profile/teivah.dev/post/3m5yj5ntfyc23Build Your Own Key-Value Storage Engine—Week 2: In-Memory Store (Written in collaboration with @scylladb.com) This week, we explore the foundations of LSM trees: memtable and SSTables. https://read.thecoder.cafe/p/build-your-own-kv-engine-219 Nov 2025 14:55 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m5yj5ntfyc23https://bsky.app/profile/teivah.dev/post/3m5j4yzfci22e"No act of kindness, no matter how small, is ever wasted." [New post] Nothing Beats Kindness: Celebrating World Kindness Day 🎉 https://read.thecoder.cafe/p/nothing-beats-kindness13 Nov 2025 12:08 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m5j4yzfci22ehttps://bsky.app/profile/teivah.dev/post/3m4vemf6qy22sBuild Your Own Key-Value Storage Engine—Week 1: In-Memory Store The beginning of the series written in collaboration with @scylladb.com where we explore key-value storage engines. This week, we start with a simple in-memory storage and the validation client. https://read.thecoder.cafe/p/build-your-own-kv-engine-105 Nov 2025 15:31 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m4vemf6qy22shttps://bsky.app/profile/teivah.dev/post/3m4irwwt6b22f🎃 Horror Coding Stories: Therac-25—A deadly race condition and overflow read.thecoder.cafe/p/therac-25 https://read.thecoder.cafe/p/therac-2531 Oct 2025 15:25 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m4irwwt6b22fhttps://bsky.app/profile/teivah.dev/post/3m4flt6rugk2wFalsehoods Programmers Believe About Names https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/30 Oct 2025 08:58 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m4flt6rugk2whttps://bsky.app/profile/teivah.dev/post/3m3s63yfe522u[New post] Speed vs. Velocity: The Difference Between Moving Fast and Moving Forward https://read.thecoder.cafe/p/speed-vs-velocity22 Oct 2025 15:31 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m3s63yfe522uhttps://bsky.app/profile/teivah.dev/post/3m3mxhndajc2zI just got my 🇬🇧 visa.20 Oct 2025 13:49 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m3mxhndajc2zhttps://bsky.app/profile/teivah.dev/post/3m3cwkfxrks22[New post] Conflict-Free Replicated Data Types (CRDTs): Convergence Without Coordination read.thecoder.cafe/p/crdt https://read.thecoder.cafe/p/crdt16 Oct 2025 14:06 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m3cwkfxrks22https://bsky.app/profile/teivah.dev/post/3m3b4ar6zrc2uI created a new root website for thecoder.cafe and moved the newsletter to read.thecoder.cafe. Thanks to @Cloudflare, which enabled a smooth transition.15 Oct 2025 20:43 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m3b4ar6zrc2uhttps://bsky.app/profile/teivah.dev/post/3m37oi4b2qs2kI vibe code the same way I play: saving my progress every 15 seconds.15 Oct 2025 07:04 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m37oi4b2qs2khttps://bsky.app/profile/teivah.dev/post/3m2tydu72sc2hAgentic Design Patterns https://docs.google.com/document/d/1rsaK53T3Lg5KoGwvf8ukOUvbELRtH-V0LnOIFDxBryE/10 Oct 2025 15:28 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m2tydu72sc2hhttps://bsky.app/profile/teivah.dev/post/3m2rhqlohc22yThe Story of The Coder Cafe: Celebrating the First Year This is my story behind the creation of a tech newsletter: the process, the ideas, the struggles, etc. https://www.thecoder.cafe/p/the-coder-cafe-story09 Oct 2025 15:26 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m2rhqlohc22yhttps://bsky.app/profile/teivah.dev/post/3m2m5obpl5224Today marks the birthday of my newsletter 🥳! It turns out that I wrote quite a bit during the year, so I decided to compile all the posts and release them as a book (260 pages). The book is available on Leanpub: DRM-free EPUB/PDF. Get the book: https://leanpub.com/thecodercafe-season1/ RT appreciated 🙏.07 Oct 2025 12:43 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m2m5obpl5224https://bsky.app/profile/teivah.dev/post/3m2lxpefdrk2fI re-enabled my Calendly session: https://calendly.com/teiva-harsanyi/meet If you want to chat about tech, non-tech topics, whatever, feel free to book a slot!07 Oct 2025 10:56 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m2lxpefdrk2fhttps://bsky.app/profile/teivah.dev/post/3m22gh7m6522e📢 New post: Organic Growth vs. Controlled Growth What Kind of Garden Is Your Codebase? https://www.thecoder.cafe/p/organic-growth-vs-controlled-growth30 Sep 2025 11:32 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3m22gh7m6522ehttps://bsky.app/profile/teivah.dev/post/3lzyqpm5qr22hTIL: The RUM Conjecture In short, the conjecture says that any access method faces a 3-way trade-off among read overhead, update overhead, and memory/space overhead and you can optimize at most two. https://openproceedings.org/2016/conf/edbt/paper-12.pdf29 Sep 2025 19:30 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3lzyqpm5qr22hhttps://bsky.app/profile/teivah.dev/post/3lzxxplnewk2gMy notes on the SILK: Preventing Latency Spikes in LSM Key-Value Stores whitepaper. https://substack.com/@teivah/note/c-16077140629 Sep 2025 12:03 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3lzxxplnewk2ghttps://bsky.app/profile/teivah.dev/post/3lzlnhbnhqc2aSort Lines in Source Code https://testing.googleblog.com/2025/09/sort-lines-in-source-code.html24 Sep 2025 14:27 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3lzlnhbnhqc2ahttps://bsky.app/profile/teivah.dev/post/3lyy4f7miis23What Makes System Calls Expensive: A Linux Internals Deep Dive. https://blog.codingconfessions.com/p/what-makes-system-calls-expensive Another great post by @abhi9u.bsky.social. I learned a lot, including vDSO.16 Sep 2025 20:01 +0000at://did:plc:6bvsq2m6i2aulaftswc76te3/app.bsky.feed.post/3lyy4f7miis23