I'm crazy, lazy and busy! — a personal blog about tech, AI, travel, and life by Hoang Yell.https://hoangyell.com/en-ushttps://hoangyell.com/yellorn-data-doctor-mock-webhook/https://hoangyell.com/yellorn-data-doctor-mock-webhook/A human tour of Yellorn: repair broken JSON, XML, YAML, and CSV, publish mock webhook APIs, send HTTP requests, and keep integration debugging in one focused browser workspace.Sat, 02 May 2026 00:00:00 GMTTechDeveloper Toolsyellornjsonxmlyamlcsvapideveloper-toolswebhookrequest-sendercloudflaredata-cleaningdata-doctorhttps://hoangyell.com/production-google-oauth-in-one-prompt-cursor-chrome-devtools-mcp/https://hoangyell.com/production-google-oauth-in-one-prompt-cursor-chrome-devtools-mcp/I asked an AI agent to wire production-grade Google OAuth into yellorn.com. One prompt later, it had clicked through Google Cloud Console, configured the consent screen, registered the OAuth client, stored the secrets in Cloudflare, and shipped to prod. I just sipped coffee.Sat, 25 Apr 2026 00:00:00 GMTAITechAICursorChrome DevTools CLIGoogle OAuthCloudflareAutomationAgentic Frameworkshttps://hoangyell.com/moneyprinterv2-automate-content-creation/https://hoangyell.com/moneyprinterv2-automate-content-creation/An assembly line for AI content — local LLMs write the script, KittenTTS reads it, Gemini paints the pictures. The video uploads itself.Sun, 22 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAIAutomationYouTubePythonhttps://hoangyell.com/project-nomad-offline-knowledge-bunker/https://hoangyell.com/project-nomad-offline-knowledge-bunker/When the cloud evaporates, what stays on your disk matters.Sun, 22 Mar 2026 00:00:00 GMTTechGitHubTechGitHubSelf-HostedOfflineAIhttps://hoangyell.com/ruanyf-weekly-digital-lighthouse/https://hoangyell.com/ruanyf-weekly-digital-lighthouse/At the end of the infinite scroll, one man is still standing.Sun, 22 Mar 2026 00:00:00 GMTTechGitHubTechGitHubCurationOpenSourceNewsletterhttps://hoangyell.com/superpowers-ai-agents-discipline/https://hoangyell.com/superpowers-ai-agents-discipline/Superpowers makes coding agents slow down, ask questions, write plans, and test first. The result is less flashy AI code, but much more trustworthy code.Wed, 18 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAIAgentsDevelopmentClaudeCursorWorkflowhttps://hoangyell.com/agency-agents-explained/https://hoangyell.com/agency-agents-explained/Discover how The Agency replaces generic prompts with a meticulously crafted roster of specialized AI agents for engineering, design, and more.Tue, 17 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAIAgenticWorkflowhttps://hoangyell.com/bitnet-explained/https://hoangyell.com/bitnet-explained/Explore bitnet.cpp, Microsoft's official framework for 1-bit LLMs that replaces multiplications with additions for massive speedups.Tue, 17 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAILLMQuantizationBitNethttps://hoangyell.com/lightpanda-browser-explained/https://hoangyell.com/lightpanda-browser-explained/Discover Lightpanda, a headless browser built from scratch in Zig for ultra-fast AI agents and automation without the overhead of Chromium.Tue, 17 Mar 2026 00:00:00 GMTTechGitHubTechGitHubZigBrowserAutomationAIhttps://hoangyell.com/mirofish-explained/https://hoangyell.com/mirofish-explained/Discover MiroFish, a universal swarm intelligence engine that uses multi-agent simulations to predict future trajectories in a digital mirror world.Tue, 17 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAIMulti-AgentSimulationhttps://hoangyell.com/how-to-find-the-best-ai-model-to-optimize-your-pc-hardware/https://hoangyell.com/how-to-find-the-best-ai-model-to-optimize-your-pc-hardware/A deep dive into choosing the right LLM model for your local hardware using LM Studio. Learn to read model specs, understand quantization, and maximize GPU performance.Sat, 07 Mar 2026 00:00:00 GMTTechAIhttps://hoangyell.com/is-openclaw-overhyped-2026/https://hoangyell.com/is-openclaw-overhyped-2026/A grounded look at OpenClaw's real-world value, separating the viral hype from actual capabilities, and why your IDE agent isn't going anywhere.Sat, 07 Mar 2026 00:00:00 GMTTechAIOpenClawAntigravityHardwarehttps://hoangyell.com/defuddle-explained/https://hoangyell.com/defuddle-explained/Defuddle is an emerging TypeScript alternative to Mozilla Readability. Written for the Obsidian Web Clipper, it extracts clean HTML for markdown conversion, with custom site extractors and math/code block standardization.Fri, 06 Mar 2026 00:00:00 GMTTechGitHubTechGitHubTypeScriptWeb ScrapingObsidianhttps://hoangyell.com/khoj-explained/https://hoangyell.com/khoj-explained/Khoj is an open-source personal AI app that acts as your AI second brain — chat with any LLM, search your documents with semantic AI, build custom agents, and self-host it completely on your own machine.Fri, 06 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAILLMRAGSelf-Hostedhttps://hoangyell.com/opensandbox-explained/https://hoangyell.com/opensandbox-explained/Alibaba open-sourced a general-purpose sandbox platform for AI applications — supporting Coding Agents, GUI Agents, RL Training and more, with multi-language SDKs and Docker/Kubernetes runtimes.Fri, 06 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAISandboxMLOpshttps://hoangyell.com/get-shit-done-explained/https://hoangyell.com/get-shit-done-explained/A deep dive into GSD (Get Shit Done), a powerful meta-prompting and context-engineering system that averts AI context rot for Claude, Gemini, and general AI agents.Wed, 04 Mar 2026 00:00:00 GMTTechGitHubTechGitHubAIAgentsClaudeGeminiGSDhttps://hoangyell.com/agent-skills-context-engineering-explained/https://hoangyell.com/agent-skills-context-engineering-explained/A deep dive into Agent Skills for Context Engineering — the open-source toolkit cited in academic research that teaches you how to curate context windows like a professional AI engineer.Sat, 28 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAILLMAgentsContext Engineeringhttps://hoangyell.com/awesome-openclaw-usecases-explained/https://hoangyell.com/awesome-openclaw-usecases-explained/Discover real-world use cases for OpenClaw that turn a simple chat interface into a proactive, self-healing, and goal-driven autonomous workforce.Sat, 28 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAIOpenClawAutomationAgentshttps://hoangyell.com/deer-flow-explained/https://hoangyell.com/deer-flow-explained/Discover how DeerFlow 2.0 transforms from a deep research tool into a full-fledged agent harness with sandboxing, sub-agents, and persistent memory.Sat, 28 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAIPythonLangChainAgentshttps://hoangyell.com/gitnexus-explained/https://hoangyell.com/gitnexus-explained/GitNexus indexes any codebase into a knowledge graph — every dependency, call chain, cluster, and execution flow — then exposes it through MCP tools so AI agents never miss code.Sat, 28 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAIMCPKnowledge GraphDeveloper Toolshttps://hoangyell.com/system-prompts-ai-tools-leaked-explained/https://hoangyell.com/system-prompts-ai-tools-leaked-explained/A deep-dive into the most comprehensive collection of leaked system prompts from Cursor, Manus, Windsurf, Devin, v0, and 30+ other AI tools — revealing their core architectures, tool designs, and agent philosophies.Sat, 28 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAILLMAgentsSystem Promptshttps://hoangyell.com/huggingface-skills-explained/https://hoangyell.com/huggingface-skills-explained/What are Hugging Face Skills? A mastery guide to empowering Claude Code, Cursor, and Gemini CLI with open-source ML capabilities.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubAIAgentsHugging FaceSkillshttps://hoangyell.com/openbb-explained/https://hoangyell.com/openbb-explained/A deep dive into OpenBB, the open-source platform that unifies financial data APIs into a single interface for Python developers, analysts, and AI agents.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubTechGitHubFinancePythonDatahttps://hoangyell.com/openclaw-explained/https://hoangyell.com/openclaw-explained/A deep dive into OpenClaw, a self-hosted personal AI assistant that unifies WhatsApp, Telegram, Slack, Discord, Signal, iMessage, and more under a single local-first gateway.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAIChatbotSelf-Hostedhttps://hoangyell.com/pentagi-explained/https://hoangyell.com/pentagi-explained/A deep dive into PentAGI, an autonomous AI-driven penetration testing system combining 20+ security tools with a smart multi-agent architecture.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAICybersecurityPentestinghttps://hoangyell.com/pi-mono-explained/https://hoangyell.com/pi-mono-explained/A deep dive into Pi Mono, the radically extensible monorepo for building AI agents that refuses to dictate your workflow—and lets you build the agent you actually want.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAICLITypeScripthttps://hoangyell.com/shannon-explained/https://hoangyell.com/shannon-explained/A deep dive into Shannon, the fully autonomous AI penetration tester by Keygraph that executes real exploits—not just alerts—using a sophisticated multi-agent architecture.Sun, 22 Feb 2026 00:00:00 GMTTechGitHubTechGitHubAICybersecurityPentestinghttps://hoangyell.com/5-awesome-projects-to-build-with-lm-studios-local-api/https://hoangyell.com/5-awesome-projects-to-build-with-lm-studios-local-api/A quick guide on how to use LM Studio's Local Server for Python scripts, OpenClaw, AI coding assistants, and secure document chats.Sat, 07 Feb 2026 00:00:00 GMTAICodingAILLMLM StudioPythonQwenhttps://hoangyell.com/bits-bytes-characters-encoding/https://hoangyell.com/bits-bytes-characters-encoding/If you have no idea how many bytes a song lyric or even a single letter takes, this post will unlock a core computing skill you're missing.Sat, 27 Dec 2025 00:00:00 GMTTechEncodingUnicodehttps://hoangyell.com/i-almost-ran-malware-from-a-fake-linkedin-recruiter/https://hoangyell.com/i-almost-ran-malware-from-a-fake-linkedin-recruiter/Fake recruiter, fake repo, real malware. A step-by-step teardown of a LinkedIn scamSun, 07 Dec 2025 00:00:00 GMTTechMalwareLinkedInhttps://hoangyell.com/fulfill-your-dirty-fantasies-with-comfy-ui/https://hoangyell.com/fulfill-your-dirty-fantasies-with-comfy-ui/Ever tried prompting naughty thoughts in ChatGPT or MidJourney—only to get slapped with a warning? Same. The real fun? Just you, your PC, and your filthy imagination.Tue, 27 May 2025 00:00:00 GMTTechAINSFWhttps://hoangyell.com/github-copilot-with-vs-code-tricks-101/https://hoangyell.com/github-copilot-with-vs-code-tricks-101/A comprehensive guide to the most important tricks for maximizing your productivity with GitHub Copilot in VS Code.Sat, 24 May 2025 00:00:00 GMTTechAIhttps://hoangyell.com/our-honeymoon-in-japan/https://hoangyell.com/our-honeymoon-in-japan/Korea was my pick, Japan was hers. Honestly, I think she's marrying matcha, not me. I've already had my Jeju adventure—so this time, congratulations Japan, I choose you!Sat, 17 May 2025 00:00:00 GMTLifeTravelhttps://hoangyell.com/how-i-built-my-dream-pc-from-shopee/https://hoangyell.com/how-i-built-my-dream-pc-from-shopee/Ever wondered if you can build a great PC from Shopee? Here’s my story—what worked, what didn’t, and how you can build your dream machine on a budget.Thu, 01 May 2025 00:00:00 GMTTechDIYhttps://hoangyell.com/marriage/https://hoangyell.com/marriage/Perfect timing, perfect place, perfect person: A chance encounter on a ride completely rewrote HoangYell's dating life!Fri, 06 Dec 2024 00:00:00 GMTLifeMarriagehttps://hoangyell.com/us8-100-days-in-america-new-york/https://hoangyell.com/us8-100-days-in-america-new-york/Nightly, the habit of manifesting dreams before sleep unwittingly sends me to the city that never sleeps, marking my unexpected return to the American saga.Mon, 12 Aug 2024 00:00:00 GMTLifeTravelhttps://hoangyell.com/sg1-singapore-4-days-3-nights/https://hoangyell.com/sg1-singapore-4-days-3-nights/Detailing our first trip abroad, from the initial preparations to the last day. Our choice was the vibrant city-state of SingaporeSat, 11 Nov 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us7-100-days-in-america-los-angeles/https://hoangyell.com/us7-100-days-in-america-los-angeles/Los Angeles, the city of angels shining brightly and demons scheming in the dark, truly embodies the essence of the cinematic world it's famous for.Mon, 04 Sep 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us6-100-days-in-america-arizona/https://hoangyell.com/us6-100-days-in-america-arizona/Diving deep into the heart of Arizona, the unique state where I've spent the most time during my American adventure.Sun, 27 Aug 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us5-100-days-in-america-san-francisco/https://hoangyell.com/us5-100-days-in-america-san-francisco/Finally, I got the opportunity to visit Silicon Valley - the high-tech haven where Google, Apple, and the headquarters of major tech giants are situated.Sat, 22 Jul 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us4-100-days-in-america-new-discoveries-amidst-melancholy/https://hoangyell.com/us4-100-days-in-america-new-discoveries-amidst-melancholy/I'm sick - homesick. This place is pretty bland. I ain't in the mood to blog, but lemme give a brief update on my current life in Arizona.Sun, 18 Jun 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us3-100-days-in-america-the-beginning-of-an-epic-journey/https://hoangyell.com/us3-100-days-in-america-the-beginning-of-an-epic-journey/The stars have aligned, and HoangYell's dream is finally coming true! It's a journey through stars and stripes to reach Lady Gaga's sky.Sat, 03 Jun 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us2-experiencing-the-us-visa-interview-in-hanoi/https://hoangyell.com/us2-experiencing-the-us-visa-interview-in-hanoi/Conquering the US visa in less than 24 hours. The step-by-step process from preparation to interview, and the happy ending for the first time in the capital.Fri, 02 Jun 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/us1-opportunity-and-preparation-for-the-first-us-trip/https://hoangyell.com/us1-opportunity-and-preparation-for-the-first-us-trip/In this blog series, I'll spill the tea on my journey, from start to end, just to satisfy my taste for flexing and to avoid annoying my Facebook friends with too many ostentatious posts.Thu, 01 Jun 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/ai-agents-multi-agent-systems/https://hoangyell.com/ai-agents-multi-agent-systems/What's the difference between ChatGPT and an AI Agent? A mastery guide to tool calling, LangGraph orchestration, and why multi-agent is the architecture of 2026.Thu, 25 May 2023 00:00:00 GMTTechAIAgentsLangGraphPythonhttps://hoangyell.com/caching-redis-mastery/https://hoangyell.com/caching-redis-mastery/Why does Redis make everything faster? A mastery guide to cache invalidation (the hardest problem in CS), eviction strategies, and Redis data types.Thu, 25 May 2023 00:00:00 GMTTechSystem DesignRedisPerformancePythonhttps://hoangyell.com/cdn-content-delivery-network/https://hoangyell.com/cdn-content-delivery-network/Why does your image load instantly for users in the US but crawls in Vietnam? A mastery guide to CDN Edge Nodes, Cache-Control headers, and cache busting.Thu, 25 May 2023 00:00:00 GMTTechSystem DesignPerformanceNetworkinghttps://hoangyell.com/cicd-pipeline-github-actions/https://hoangyell.com/cicd-pipeline-github-actions/Why does 'works on my machine' still happen with Docker? A mastery guide to CI/CD pipelines, GitHub Actions, and zero-downtime Blue/Green deployments.Thu, 25 May 2023 00:00:00 GMTTechDevOpsCI/CDGitHub ActionsDockerhttps://hoangyell.com/database-indexing-b-tree/https://hoangyell.com/database-indexing-b-tree/Why does adding an index make a query 100x faster? A mastery guide to B-Trees, compound indexes, covering indexes, and the queries that kill your database.Thu, 25 May 2023 00:00:00 GMTTechDatabaseSQLPerformancePostgreSQLhttps://hoangyell.com/fine-tuning-vs-rag/https://hoangyell.com/fine-tuning-vs-rag/When should you fine-tune a model vs. use RAG? A mastery guide to LoRA, PEFT, and the decision framework that saves you from wasting $10,000 GPU hours.Thu, 25 May 2023 00:00:00 GMTTechAIFine-tuningRAGPythonhttps://hoangyell.com/llm-rag-retrieval-augmented-generation/https://hoangyell.com/llm-rag-retrieval-augmented-generation/Why do LLMs hallucinate? A mastery guide to Retrieval Augmented Generation (RAG) — the architecture powering every serious AI product in 2026.Thu, 25 May 2023 00:00:00 GMTTechAILLMRAGPythonhttps://hoangyell.com/mcp-model-context-protocol/https://hoangyell.com/mcp-model-context-protocol/What is MCP and why is every AI tool adopting it in 2026? A mastery guide to Anthropic's open standard for connecting AI models to the real world.Thu, 25 May 2023 00:00:00 GMTTechAIMCPAgentsPythonhttps://hoangyell.com/message-queue-celery-rabbitmq-kafka/https://hoangyell.com/message-queue-celery-rabbitmq-kafka/Why does sending an email block your API? A mastery guide to async task queues (Celery/Django-Q), message brokers (RabbitMQ), and event streaming (Kafka).Thu, 25 May 2023 00:00:00 GMTTechSystem DesignPythonCeleryKafkaRabbitMQhttps://hoangyell.com/observability-logs-metrics-tracing/https://hoangyell.com/observability-logs-metrics-tracing/Your app is slow. Is it the DB? The queue? The network? A mastery guide to the three pillars of observability and how they work together.Thu, 25 May 2023 00:00:00 GMTTechDevOpsObservabilityMonitoringPythonhttps://hoangyell.com/prompt-engineering-mastery/https://hoangyell.com/prompt-engineering-mastery/Why does 'be concise' produce worse results than 'answer in 3 bullet points'? A mastery guide to system prompts, few-shot learning, chain-of-thought, and structured output.Thu, 25 May 2023 00:00:00 GMTTechAIPrompt EngineeringLLMPythonhttps://hoangyell.com/rate-limiting-circuit-breaker/https://hoangyell.com/rate-limiting-circuit-breaker/How do you stop one bad client from taking down your entire API? A mastery guide to rate limiting strategies, circuit breakers, and resilience patterns.Thu, 25 May 2023 00:00:00 GMTTechSystem DesignResilienceAPIPythonhttps://hoangyell.com/redis-vs-core-database/https://hoangyell.com/redis-vs-core-database/As hardware gets cheaper, why not use Redis as the main database? The short answer: because the limitation isn't speed. It's guarantees and data semantics.Thu, 25 May 2023 00:00:00 GMTTechSystem DesignDatabaseRedisArchitecturehttps://hoangyell.com/rest-vs-graphql-vs-grpc/https://hoangyell.com/rest-vs-graphql-vs-grpc/Why does GraphQL exist if REST works fine? A mastery guide to API protocols, when to use each, and how gRPC changes the game for internal services.Thu, 25 May 2023 00:00:00 GMTTechSystem DesignAPIRESTGraphQLgRPChttps://hoangyell.com/vector-database-embeddings/https://hoangyell.com/vector-database-embeddings/How does Spotify know you'll like this song? A mastery guide to embeddings, cosine similarity, and vector databases (Pinecone, Weaviate, pgvector).Thu, 25 May 2023 00:00:00 GMTTechAIVector DatabaseEmbeddingsPythonhttps://hoangyell.com/when-to-use-classes-vs-functions-in-python/https://hoangyell.com/when-to-use-classes-vs-functions-in-python/A repeatable mental checklist for Python developers to decide when to use classes, functions, instance state, and dependency injection.Thu, 25 May 2023 00:00:00 GMTTechTechPythonSoftware DesignArchitecturehttps://hoangyell.com/when-to-use-dataclasses-generators-in-python/https://hoangyell.com/when-to-use-dataclasses-generators-in-python/Phase 2 of the mental checklist for Python developers. Navigating dictionaries vs dataclasses, eager evaluation vs lazy execution, and error handling philosophies.Thu, 25 May 2023 00:00:00 GMTTechTechPythonSoftware DesignBest Practiceshttps://hoangyell.com/bulk-webp-migration/https://hoangyell.com/bulk-webp-migration/My Lighthouse score was crying because of heavy images. So I wrote a Python ETL to bulk-convert everything to WebP and update all the URLs automatically. Here's how.Wed, 24 May 2023 00:00:00 GMTTechPerformancePythonWebPhttps://hoangyell.com/cache-busting-mystery/https://hoangyell.com/cache-busting-mystery/Deployed your latest changes but still seeing the ghost of the old version? Let's talk about the aggressive memory of browsers and how to fix it.Tue, 23 May 2023 00:00:00 GMTTechWeb DevHugoCachinghttps://hoangyell.com/database-bloat-s3-pointer/https://hoangyell.com/database-bloat-s3-pointer/Why 10MB JSON blobs kill your buffer pool, and how to keep MySQL lean with S3 + presigned URLs.Mon, 22 May 2023 00:00:00 GMTTechMySQLS3https://hoangyell.com/verify-and-cert-in-python-requests/https://hoangyell.com/verify-and-cert-in-python-requests/Understanding SSL/TLS in Python Requests: The 'verify' and 'cert' arguments explained with interactive animations.Mon, 22 May 2023 00:00:00 GMTTechCodingSecurityhttps://hoangyell.com/api-certificates-chain-of-trust/https://hoangyell.com/api-certificates-chain-of-trust/Stop guessing with SSLErrors. A mastery-level guide to the Chain of Trust, openssl debugging, and proving exactly whose fault it is.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignSecurityAPIPythonhttps://hoangyell.com/authentication-vs-authorization-vs-oauth/https://hoangyell.com/authentication-vs-authorization-vs-oauth/Stop mixing up 401 and 403. A mastery guide to AuthN (Who you are), AuthZ (What you can do), and the OAuth Valet Key.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignSecurityAPIhttps://hoangyell.com/consistent-hashing-distributed-systems/https://hoangyell.com/consistent-hashing-distributed-systems/How does Cassandra know which server stores your data? A mastery guide to consistent hashing, virtual nodes, and why your cache doesn't invalidate when a server is added.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignDistributed SystemsHashinghttps://hoangyell.com/docker-vs-kubernetes/https://hoangyell.com/docker-vs-kubernetes/Why do I need K8s if I have Docker? A mastery guide to understanding Containers (Robots) vs Orchestration (The Manager).Sun, 21 May 2023 00:00:00 GMTTechDevOpsDockerKuberneteshttps://hoangyell.com/latency-vs-throughput-bandwidth/https://hoangyell.com/latency-vs-throughput-bandwidth/Why is your API slow even though your internet is fast? A mastery guide to P99 latency, bandwidth, and finding the bottleneck.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignPerformanceMetricshttps://hoangyell.com/loadbalancer-reverseproxy-apigateway/https://hoangyell.com/loadbalancer-reverseproxy-apigateway/Confused by the 'Traffic Trio'? A mastery-level guide to Load Balancers, Reverse Proxies, and API Gateways — from mental models to Nginx configs.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignNetworkingInfrastructurehttps://hoangyell.com/monolith-vs-microservices/https://hoangyell.com/monolith-vs-microservices/Is Microservices mostly hype? A mastery guide to the 'Distributed Monolith', Latency taxes, and knowing when to split.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignArchitectureMicroserviceshttps://hoangyell.com/partitioning-bucketing-sharding-replication-edge/https://hoangyell.com/partitioning-bucketing-sharding-replication-edge/A precise mental model for partitioning, bucketing, sharding, replication, and edge computing - when to use each and why they exist at different layers.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignDatabasesScalingEdgehttps://hoangyell.com/sp7-proxy-learn-design-pattern-from-simple-things/https://hoangyell.com/sp7-proxy-learn-design-pattern-from-simple-things/The boss wants the employees to focus on work and not get distracted by social media. So he decides to block some websites on the corporate network during working hours.Sun, 21 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/sql-vs-nosql-postgresql-mongodb/https://hoangyell.com/sql-vs-nosql-postgresql-mongodb/Why is MongoDB faster but Postgres safer? A mastery guide to Schema, ACID, and why JSONB might be the only NoSQL you need.Sun, 21 May 2023 00:00:00 GMTTechSystem DesignDatabasePostgresMongoDBhttps://hoangyell.com/tcp-vs-udp-handshake/https://hoangyell.com/tcp-vs-udp-handshake/Why does video calling glitch but file downloads pause? A mastery guide to the 3-Way Handshake, Head-of-Line Blocking, and why UDP is winning (HTTP/3).Sun, 21 May 2023 00:00:00 GMTTechNetworkingTCP/IPProtocolsHTTP/3https://hoangyell.com/sp6-object-pool-learn-design-pattern-from-simple-things/https://hoangyell.com/sp6-object-pool-learn-design-pattern-from-simple-things/Producing planes on a large scale is expensive, but fortunately the manufactured raw parts are always stored in the pool, thereby reducing duplication in the production process.Fri, 19 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/sp5-facade-learn-design-pattern-from-simple-things/https://hoangyell.com/sp5-facade-learn-design-pattern-from-simple-things/There are many departments in the building and you feel confused! By opening the entrances from the facade according to purposes, you simply follow the pre-arranged flow.Tue, 16 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/sp4-mixer-learn-design-pattern-from-simple-things/https://hoangyell.com/sp4-mixer-learn-design-pattern-from-simple-things/You are a dog farm owner who manages the properties of all dog breeds. The number of crossbred dogs is increasing every day because of the emergence of new breeds!Sat, 13 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp10-mediator-learn-design-pattern-from-simple-things/https://hoangyell.com/bp10-mediator-learn-design-pattern-from-simple-things/In the discussion room without a teacher, you can speak or listen, but when you speak you need to make sure that everyone can hear. Therefore, a loudspeaker is a useful tool.Sun, 07 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp9-file-history-learn-design-pattern-from-simple-things/https://hoangyell.com/bp9-file-history-learn-design-pattern-from-simple-things/Undo and redo are common features in editing software. They look simple on the surface, but how do they work internally? How do you design structure and behavior for them?Mon, 01 May 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp8-visitor-learn-design-pattern-from-simple-things/https://hoangyell.com/bp8-visitor-learn-design-pattern-from-simple-things/Have you had a chance to watch The Spy Gone North? The spy infiltrated North Korea's secret locations, and collected its secrets effectively by applying the Visitor Pattern!Sun, 09 Apr 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp7-template-method-learn-design-pattern-from-simple-things/https://hoangyell.com/bp7-template-method-learn-design-pattern-from-simple-things/Porsche and Lamborghini are the children of Volkswagen. Their manufacturing process uses the same structure because they both implement the Volkswagen Template Method.Sat, 01 Apr 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp6-state-learn-design-pattern-from-simple-things/https://hoangyell.com/bp6-state-learn-design-pattern-from-simple-things/Have you ever thought about the ATM logic? How is ATM logic organized to cover all cases without any misses? Do you feel confused when handling many operations on many states?Sat, 18 Mar 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp5-observer-learn-design-pattern-from-simple-things/https://hoangyell.com/bp5-observer-learn-design-pattern-from-simple-things/Some students in a class are attentive, but others are easily distracted. The teacher is indifferent to them; for her, they are all observers and she just performs her duty.Sat, 11 Mar 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bach-ma-from-conquering-the-fear-to-conquering-the-mountain/https://hoangyell.com/bach-ma-from-conquering-the-fear-to-conquering-the-mountain/Craving excitement beyond the tedious routine of eating, sleeping, and sipping coffee on weekends, we decided to embark on an exhilarating journey to Bach Ma - the perfect destination to beat the boredom.Sun, 19 Feb 2023 00:00:00 GMTLifeTravelhttps://hoangyell.com/bp4-handling-chain-learn-design-pattern-from-simple-things/https://hoangyell.com/bp4-handling-chain-learn-design-pattern-from-simple-things/As a laid-off employee, you prepare for a series of top companies, and then attempt to apply one by one (only apply the next if the current is rejected) until one hires you.Sun, 05 Feb 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/bp3-command-learn-design-pattern-from-simple-things/https://hoangyell.com/bp3-command-learn-design-pattern-from-simple-things/As an army commander, you have to plan all the tasks for the soldiers, so that they can execute them. This process is called command.Sat, 14 Jan 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/sp3-tree-learn-design-pattern-from-simple-things/https://hoangyell.com/sp3-tree-learn-design-pattern-from-simple-things/You need to store the leaves hierarchically, sometimes you will count the leaves. Tree will be a suitable structure to facilitate leaf counting.Sun, 01 Jan 2023 00:00:00 GMTTechCodinghttps://hoangyell.com/cp5-singleton-learn-design-pattern-from-simple-things/https://hoangyell.com/cp5-singleton-learn-design-pattern-from-simple-things/Apply singleton to maintain a single phone line between the two sides indefinitely instead of repeatedly establishing and disconnecting multiple phone lines for efficiency.Sun, 25 Dec 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/cp4-prototype-learn-design-pattern-from-simple-things/https://hoangyell.com/cp4-prototype-learn-design-pattern-from-simple-things/Having been with you for a long time, your robot has memories that regular manufacturing can't produce, now you want to clone it. Prototype will be your remedy.Sun, 18 Dec 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/bp2-strategy-learn-design-pattern-from-simple-things/https://hoangyell.com/bp2-strategy-learn-design-pattern-from-simple-things/As the coach of a strong team, you plan to attack to find a goal and then prioritize possession to preserve the score. This combination is called strategy.Sat, 10 Dec 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/sp2-decorator-function-decorator-closure-learn-design-pattern-from-simple-things/https://hoangyell.com/sp2-decorator-function-decorator-closure-learn-design-pattern-from-simple-things/Having ice creams (popsicle, cone) and curious about how good it will be with extra flavor. For the most authentic experience, you should dip your ice creams in each flavor.Tue, 29 Nov 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/cp3-builder-design-pattern-from-simple-things/https://hoangyell.com/cp3-builder-design-pattern-from-simple-things/Building a house involves bringing together many parts, each house has its own specific requirements, you need a builder who can easily implement what you want.Tue, 22 Nov 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/bp1-gun-iterator-design-pattern-from-simple-things/https://hoangyell.com/bp1-gun-iterator-design-pattern-from-simple-things/There are bullets that need to be fired one by one in a specific order. You need a tool to set it up neatly and easily upgrade later.Thu, 17 Nov 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/cp2-comparison-between-factories-simple-factory-factory-method-abstract-factory-design-pattern-from-simple-things/https://hoangyell.com/cp2-comparison-between-factories-simple-factory-factory-method-abstract-factory-design-pattern-from-simple-things/Simple Factory is da best, Factory Method and Abstract Factory are cumbersome, complicated and stupid?Fri, 11 Nov 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/cp1-vending-machine-factory-design-pattern-from-simple-things/https://hoangyell.com/cp1-vending-machine-factory-design-pattern-from-simple-things/Different beverages are scattered in different stores, it's too tiring to run through each store to find your beverage. You wish all beverages were sold in one place.Sat, 29 Oct 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/sp1-adapter-learn-design-pattern-from-simple-things/https://hoangyell.com/sp1-adapter-learn-design-pattern-from-simple-things/Having many devices that need to connect to your Macbook leads to too many cables. You need a tool to replace all those cables.Sat, 15 Oct 2022 00:00:00 GMTTechCodinghttps://hoangyell.com/fbp1-google-foobar-plus-dodge-the-lasers/https://hoangyell.com/fbp1-google-foobar-plus-dodge-the-lasers/Level 5: I tried retyping `request` and Google Foobar still revealed the challenge for meTue, 04 Oct 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fbp0-google-foobar-plus-disorderly-escape/https://hoangyell.com/fbp0-google-foobar-plus-disorderly-escape/Level 5: After completing all the levels I tried typing `request` to see what happens, then this challenge is the resultMon, 03 Oct 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb5-google-foobar-expanding-nebula-cellular-automaton/https://hoangyell.com/fb5-google-foobar-expanding-nebula-cellular-automaton/Level 5: The Final ChallengeSat, 01 Oct 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb4-google-foobar-free-the-bunny-workers-escape-pods/https://hoangyell.com/fb4-google-foobar-free-the-bunny-workers-escape-pods/Level 4: The Real Coding ChallengeSat, 24 Sep 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb3-google-foobar-doomsday-fuel-the-grandest-staircase-of-them-all-fuel-injection-perfection/https://hoangyell.com/fb3-google-foobar-doomsday-fuel-the-grandest-staircase-of-them-all-fuel-injection-perfection/Level 3: The Reading Comprehension Challenge.Sat, 17 Sep 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb2-google-foobar-gearing-up-for-destruction-dont-get-volunteered/https://hoangyell.com/fb2-google-foobar-gearing-up-for-destruction-dont-get-volunteered/Level 2: The Math Challenge. Find the formula is the main part.Sun, 28 Aug 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb1-google-foobar-minion-work-assignments/https://hoangyell.com/fb1-google-foobar-minion-work-assignments/Level 1: The Very First Challenge. Learn how to do it and find loopholes for easier debugging.Sat, 27 Aug 2022 00:00:00 GMTTechGoogleFoobarhttps://hoangyell.com/fb0-google-foobar-a-godsend-to-kill-my-laziness/https://hoangyell.com/fb0-google-foobar-a-godsend-to-kill-my-laziness/Google sent me an invitation to take up their challenge!Thu, 25 Aug 2022 00:00:00 GMTTechGoogleFoobar