Tag: #english
Writing on GPUs, LLMs, MLOps, Kubernetes — and mindset · 592 posts
The Complete Developer Mental Health Guide: Impostor Syndrome, Anxiety, Depression, Burnout, and Recovery (2025)
What the Stack Overflow survey revealed about developer mental health. How impostor syndrome forms and how to work through it. The line between anxiety and clinical anxiety. The science of CBT and meditation. Using EAP,
2026-04-15 · 15 min read #mental-health#impostor-syndrome#anxiety#depression#burnoutElasticsearch & Lucene Internals Complete Guide 2025: Deep Dive into Segments, Inverted Index, Refresh/Flush/Merge, and Shard Routing
The secret behind how Elasticsearch searches billions of log entries in milliseconds every day. A complete 720-line analysis of Lucene segment structure, inverted index, the refresh/flush/merge cycle, shard routing, and
2026-04-15 · 26 min read #elasticsearch#lucene#search#inverted-index#segmentA Deep-Dive Guide to the New Era of Edge Computing — Cloudflare Workers, Durable Objects, D1, Vercel Edge, Deno Deploy, Fastly, Fly.io, Turso, and Region-aware Architecture (2025)
Edge computing, which began with Cloudflare Workers in 2017, became the default infrastructure of virtually every modern SaaS by 2024-2025. The UX bar of "50ms even on the opposite side of the earth" is the practical rea
2026-04-15 · 15 min read #edge-computing#cloudflare-workers#durable-objects#d1#vercel-edgeThe Complete DNS Guide — Resolvers, DNSSEC, DoH/DoT, Anycast, CoreDNS, and Everything Else (2025)
Everything about DNS — the history of the name system that started with hosts.txt, query flow (stub to recursive to root to TLD to authoritative), record types (A/AAAA/CNAME/MX/TXT/NS/SOA/SRV/CAA/HTTPS/SVCB), EDNS0 and p
2026-04-15 · 25 min read #dns#dnssec#doh#networking#securityDuckDB Internals Deep Dive — Embedded OLAP, Vectorized Execution, Morsel-Driven Parallelism, and Storage Format (2025)
DuckDB — the analytical engine that replaces Pandas and brings a ClickHouse-class OLAP database into your process. This post dissects DuckDB from the ground up: the journey from Mark Raasveldt and Hannes Mühleisens 2018
2026-04-15 · 24 min read #duckdb#olap#database#columnar#vectorizationFrontend Testing 2025 — Vitest, Jest, Bun, Testing Library, Playwright, Storybook, MSW, Visual Regression, AI (S6 E11)
Jest is no longer the default. Vitest won the unit-test race, Playwright displaced Cypress for e2e, Storybook 8 made component tests first-class, and AI-generated tests became table stakes. This is a practical guide to a
2026-04-15 · 6 min read #frontend#testing#vitest#jest#bun-testDistributed Databases 2025 — CockroachDB, Spanner, TiDB, Yugabyte, Aurora DSQL, Neon, PlanetScale, Turso, D1 (S7 E3)
The "just use one database" era is over. In 2024–2025 distributed SQL (CockroachDB, Spanner, TiDB, Yugabyte), serverless Postgres (Neon, Supabase, PlanetScale, Aurora DSQL), and edge SQLite (Turso/libSQL, Cloudflare D1)
2026-04-15 · 11 min read #database#distributed-sql#postgresql#cockroachdb#spannerDistributed Consensus Deep Dive — Paxos, Raft, ZAB, FLP, etcd, ZooKeeper, KRaft, BFT, CRDT (2025)
Why is it hard for a distributed system to merely "agree"? The shock of the FLP impossibility result, Lamport's Paxos and its infamous unintelligibility, how Raft changed the landscape, ZooKeeper's ZAB, the birth of KRaf
2026-04-15 · 15 min read #distributed-systems#consensus#paxos#raft#etcdThe Complete Developer Writing Guide: Design Doc, RFC, Blog, Book, Conference Talk (2025)
80% of a Staff+ engineer's influence comes from writing, not code. Breaking down Google's Design Doc template, the RFC processes of Rust/Python/Node, the blogs of Julia Evans/Dan Luu/Stratechery, the O'Reilly/Manning pub
2026-04-15 · 17 min read #writing#design-doc#rfc#tech-blog#conference-talkeBPF Complete Guide — A Tiny VM Inside the Kernel: Verifier, JIT, CO-RE, Maps, Attach Points, XDP, LSM, sched_ext (2025)
Everything about eBPF — from cBPF in 1992 to eBPF in 2014 to schedext in 2024. The 11-register virtual machine ISA, the verifier's static analysis, JIT compilation, BTF and CO-RE, 17+ BPF map types, 200+ helper functions
2026-04-15 · 31 min read #linux#kernel#ebpf#bpf#xdpDocker BuildKit & Image Layers Complete Guide 2025: LLB, Cache Mount, Multi-Stage, OCI, Build Optimization Deep Dive
Why is the same Dockerfile 10x faster with BuildKit? Image layer structure, BuildKit LLB, cache mount, multi-stage builds, OCI format, reproducible builds — a complete 720-line analysis of everything about modern contain
2026-04-15 · 26 min read #docker#buildkit#oci#image-layer#cache-mountDesign Systems and Tokens 2025 — Complete Guide: Radix, shadcn/ui, Chakra, Tamagui, Park UI, Ark UI, DaisyUI Compared, the W3C Design Tokens Standard, Figma Variables and Tokens Studio Integration, Component API Design, Accessibility, and Korean Enterprise Case Studies — Season 6 Ep 2
A design system is not CSS. It is the shared language of a product team. A 2025 comparison of major component libraries (Radix, shadcn/ui, Chakra, Tamagui, Park, Ark, DaisyUI), Headless vs Styled philosophies, the W3C De
2026-04-15 · 13 min read #design-system#design-tokens#radix#shadcn-ui#chakraDB Sharding & Partitioning Complete Guide 2025: Horizontal Scaling, Range/Hash/Directory, Resharding, Vitess
Everything about database sharding! Horizontal vs vertical partitioning, shard key selection, Range/Hash/Directory/Geographic sharding, hot spot problems, resharding, distributed transactions, Vitess/Citus/CockroachDB co
2026-04-15 · 15 min read #database#sharding#partitioning#horizontal-scaling#vitessDatabase Query Optimizer Complete Guide 2025: Volcano, Cascades, Cost-Based, Cardinality Estimation — PostgreSQL/MySQL In-Depth Analysis
A single SQL statement can turn into hundreds of different execution plans. From Volcano to Cascades, how cost-based optimizers work, the pitfalls of cardinality estimation, and the internals of PostgreSQL and MySQL — a
2026-04-15 · 24 min read #database#query-optimizer#volcano#cascades#cost-basedDiffusion Models Deep Dive — DDPM, Latent Diffusion, Classifier-Free Guidance, DDIM, Stable Diffusion Complete Guide (2025)
Diffusion models — the foundation of Stable Diffusion, DALL-E, Midjourney, and Sora. This post dissects diffusion models from scratch. Forward/Reverse diffusion process, DDPM and the variational lower bound, the score-ba
2026-04-15 · 25 min read #diffusion#generative-ai#stable-diffusion#ddpm#machine-learningCRDT Complete Guide 2025: Conflict-Free Replicated Data Types, Local-First Collaboration, Yjs/Automerge
Everything about CRDTs! Conflict-free Replicated Data Types principles, State-based vs Operation-based, basic CRDTs (G-Counter/PN-Counter/G-Set/2P-Set/LWW-Register), advanced (Sequence/RGA/Yjs), local-first software, Aut
2026-04-15 · 12 min read #crdt#distributed-systems#local-first#collaboration#yjsThe Science of Modern Web Performance — A Deep Dive into Core Web Vitals, INP, LCP, CLS, RUM, Lighthouse, Critical Rendering Path, and Speculation Rules (2025)
Why is my site slow? In 2024, INP officially replaced FID, reshaping the three Core Web Vitals, while the Speculation Rules API, Partial Hydration, HTTP/3, and Early Hints all matured simultaneously. This post traces why
2026-04-15 · 21 min read #web-performance#core-web-vitals#inp#lcp#clsDistributed Locks Complete Guide 2025: Redlock, Zookeeper, etcd, Fencing Token, Safe Implementation
Everything about distributed locks! Why it is hard, single Redis lock, Redlock algorithm, Martin Kleppmann critique, Zookeeper/etcd locks, Fencing Token, real-world implementation, pitfalls to avoid.
2026-04-15 · 13 min read #distributed-lock#redis#redlock#zookeeper#etcdThe Complete AI Engineer Career Guide — From Junior to Principal: Leveling, Interviews, Portfolio, Compensation, Remote, and the Next Decade (2025-2026)
AI Engineer is the fastest-forming role since 2023. This 600-line guide lays out level-by-level expectations from junior to principal, interview and portfolio strategy, compensation structures across Korea, the US, and g
2026-04-15 · 15 min read #career#ai-engineer#leveling#interview#portfolioThe Technical Hell of Time and Date — TimeZone, DST, Leap Seconds, Temporal API, NTP Complete Guide (2025)
"I thought using UTC on the server would be enough…" — every developer gets bitten by time bugs at least once. From the real difference between Unix timestamp and ISO 8601, the subtle distinctions between UTC/GMT/TAI, th
2026-04-15 · 19 min read #datetime#timezone#temporal#ntp#dst