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Writing on GPUs, LLMs, MLOps, Kubernetes — and mindset · 3525 posts
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Savings, Deposits, and Investment Complete Comparison -- Where Should You Put Your Money?
Deposits vs savings vs stocks vs ETFs vs bonds vs real estate -- a complete comparison of each financial product by return, risk, tax, and liquidity from a developer perspective. Including ISA, IRP, and pension savings t
2026-03-02 · 9 min read #finance#savings#investment#deposit#etfInsurance Domain Complete Guide -- From Life Insurance to Property Insurance and Premium Calculation
Core principles of insurance, differences between life/property/third-sector insurance, premium calculation structure (net premium + loading), loss ratio, combined ratio, and InsurTech. A complete anatomy of insurance fo
2026-03-02 · 8 min read #finance#insurance#life-insurance#property-insurance#actuarialComplete Math Guide for AI — From Linear Algebra to Information Theory
A guide to the math needed for AI/deep learning, explained with code and intuition. Linear algebra (matrices, eigenvalues), calculus (partial derivatives, backpropagation), probability/statistics (Bayes, distributions),
2026-03-02 · 13 min read #ai#mathematics#linear-algebra#calculus#probabilityThe Complete Guide to Redundancy — The Secret Behind 99.999% Availability
From dual redundancy to triple redundancy, Active-Standby, Active-Active, N+1, split brain, and quorum. We explain why the difference between 99.9% and 99.999% translates to 8 hours vs. 5 minutes of annual downtime, with
2026-03-02 · 8 min read #architecture#high-availability#redundancy#failover#load-balancingIPsec Mastery — From VPN Tunnel Internals to Deployment
IPsec core protocols (AH, ESP, IKE), Tunnel Mode vs Transport Mode, SA/SPI concepts, and the Phase 1/Phase 2 negotiation process. We dissect the entire journey of a packet being encrypted and delivered, with diagrams and
2026-03-02 · 7 min read #architecture#ipsec#vpn#network-security#encryptionOAuth 2.0 Mastery — Everything About Authentication and Authorization
From the inner workings of OAuth 2.0 to Authorization Code, PKCE, Refresh Tokens, and OpenID Connect. Why does a single Google login button require such a complex protocol? We fully dissect it with code and sequence diag
2026-03-02 · 7 min read #architecture#oauth2#security#authentication#authorizationPractical LLM Fine-Tuning — Building Your Own Model with LoRA, QLoRA, and PEFT
A practical guide to LLM fine-tuning. From the mathematical principles of LoRA to training large models on consumer GPUs with QLoRA, and leveraging the PEFT library — all with detailed code examples.
2026-03-02 · 7 min read #llm#fine-tuning#lora#qlora#peftGrafana LGTM Stack Complete Guide: Building Unified Observability with Loki + Grafana + Tempo + Mimir
Build a unified observability platform that manages Logs, Metrics, and Traces with the Grafana LGTM (Loki, Grafana, Tempo, Mimir) stack. Includes Docker Compose hands-on, OpenTelemetry integration, and Mermaid architectu
2026-03-02 · 7 min read #observability#grafana#loki#tempo#mimirAccelerating LLM Inference 2-3x with Speculative Decoding: From Theory to Production
A deep dive into the mathematical foundations of Speculative Decoding, the Draft-Verify pipeline, acceptance probability analysis, practical implementation in vLLM/TensorRT-LLM, and Apple's Mirror Speculative Decoding.
2026-03-02 · 8 min read #llm#speculative-decoding#inference#optimization#vllmMastering Japanese Conversations at the Hospital
Learn 5 essential expressions for visiting a hospital in Japan, along with practical conversations, grammar points, and audio practice.
2026-03-02 · 8 min read #japanese#jlpt#japanese-conversation#hospital-japanese#japan-careerMastering Keigo (Honorific Japanese) at Japanese IT Companies — Practical Expressions for Email, Meetings, and Slack
A comprehensive guide to keigo (honorific) expressions used daily at Japanese IT companies, organized by email, meeting, and Slack scenarios. Learn the differences between sonkeigo, kenjougo, and teineigo along with prac
2026-03-02 · 15 min read #japanese#keigo#business-japanese#it-company#careerKubernetes RBAC Complete Guide: Hands-On Practice for Golden Kubestronaut Exam Prep
From core concepts to real-world scenarios of Kubernetes RBAC (Role-Based Access Control). A hands-on guide covering least privilege implementation with Role, ClusterRole, RoleBinding, and ServiceAccount, plus Golden Kub
2026-03-02 · 8 min read #kubernetes#rbac#security#kubestronaut#ckaetcd Backup & Restore Complete Guide — CKA Exam Essential Hands-on
A complete guide to backing up and restoring etcd — the brain of a Kubernetes cluster — with practical commands. A must-know topic for the CKA exam and an essential skill for production operations.
2026-03-02 · 7 min read #kubernetes#etcd#cka#backup#restoreKubernetes Gateway API Hands-On Migration — From Ingress to Gateway
A practical guide to migrating from Kubernetes Ingress to Gateway API. Covers concepts of GatewayClass, Gateway, and HTTPRoute, leveraging the ingress2gateway tool, and gradual transition strategies — all with code examp
2026-03-02 · 6 min read #kubernetes#gateway-api#ingress#networking#migrationComplete Guide to Japanese IT Company Interviews: Keigo, Technical Expressions, and Mock Interviews for Engineers
A comprehensive Japanese guide specialized for IT company interviews in Japan. Covers self-introduction, technical explanations, keigo usage, common questions with model answers, and common mistakes Korean engineers make
2026-03-02 · 15 min read #japanese#it-interview#keigo#tech-career#jlptEvening English Mini — Job Interviews & Career Growth
Key expressions and practical dialogue for salary negotiation and interviews — negotiate a raise, leverage your experience, compensation package
2026-03-02 · 3 min read #english#job-interview#career#salary-negotiation#evening-englishEnglish for IT Job Seekers: The Complete Tech Resume & Cover Letter Writing Guide
A complete guide to writing English resumes and cover letters for overseas IT jobs. Covers ATS optimization strategies, action verbs, the STAR method, and practical templates.
2026-03-02 · 7 min read #english#resume#cover-letter#job-interview#tech-careerGitHub Actions Advanced CI/CD — Matrix, Cache, Self-hosted Runner
Master advanced GitHub Actions features with practical examples. Parallel builds with Matrix Strategy, build speed optimization with Cache, and cost reduction with custom environments using Self-hosted Runners.
2026-03-02 · 7 min read #github-actions#ci-cd#devops#automation#self-hosted-runnerPractical Guide to English Tech Presentations — Slide Narration, Q&A Handling, and Demo Expressions
A situational compilation of frequently used English expressions in tech presentations. Covers opening, slide transitions, live demos, and Q&A handling with practical expressions and examples you can use right away.
2026-03-02 · 10 min read #english#presentation#technical-english#public-speaking#careerPostgreSQL + pgvector Vector Search Practical Guide: From RAG to Hybrid Search
Implement vector similarity search with the PostgreSQL pgvector extension. Covers installation through HNSW/IVFFlat indexes, hybrid search (vector + full-text search), and RAG pipeline integration with practical code.
2026-03-02 · 9 min read #postgresql#pgvector#vector-search#embedding#rag