Category
Tech
164posts
Tencent BrowserSkill Explained: How AI Uses Your Logged-In Browser
Tencent BrowserSkill lets AI agents use your logged-in Chrome without stealing focus. Explore tab borrowing, captcha handling, and local daemon architecture.
Zero-Dollar AI Agent Farming: Turning Broken Hardware into a 24/7 Autonomous Dev Engine
Turn a cracked-screen laptop into a 24/7 autonomous homelab server: sudden power cut protection, Bubblewrap quota relay, and phone-driven vibe coding with 0 dollars.
Claude Blog Explained: The 5-Gate Autonomous Content Engine
Inside AgriciDaniel/claude-blog: how 32 skill directories, 5 subagents, and a blocking 5-gate delivery contract eliminate hallucinated AI slop at scale.
SEO Machine Explained: The B2B SaaS Content Pipeline
Inside TheCraigHewitt/seomachine: how 7,400+ stars Claude Code workspace turns GSC telemetry and context files into revenue-generating B2B SaaS articles.
Vercel Skills Explained: The Open Agent Package Manager
How Vercel's npx skills creates a universal package manager for 79+ AI agents: architecture, symlink pipelines, skills-lock determinism, and security edges.
AutoResearch Explained: Why Karpathy Contributed to This AI Scientist
AutoResearch breaks the single-model echo chamber with a multi-model consensus pipeline, stateful Ralph loops, and independent blind reviews.
The AI Coding Agent Dictionary: Colloquial Prompts vs Standard Tech Terms
A battle-tested dictionary translating everyday developer prompts into precision architectural terms for AI coding agents to generate robust code.
High-Leverage Coding Terms & Jargon for AI Coding Agents
Discover the architectural keywords and high-leverage engineering jargon that turn AI coding agents into precision tools, eliminating hallucinations.
What AI DevKit is: a control plane for AI coding agents - and where it stops
An architectural guide to AI DevKit: local-first CLI/TUI console, shared config, SQLite memory, and workflow skills for managing multiple coding agents.
Free Claude Code Explained: One Local Proxy for 50+ AI Providers
Free Claude Code routes Claude Code, Codex, Pi, and eight more agents through one local proxy with 50 ToS-friendly providers and automatic fallback.
Python Concurrency: Understanding GIL, Threading, and Multiprocessing from First Principles
In-depth guide to Python Concurrency: Master the GIL, understand Threading vs Multiprocessing, optimize I/O vs CPU workloads, and backend architecture.
authentik Explained: IdP, SSO, SAML, OAuth2/OIDC, Okta, and Auth0
A smooth primer on authentik, IdP, SSO, and login protocols that turns identity-management jargon into a usable mental model.
Ego Lite: Open-Source AI Browser Agent with Real Logged-In Sessions
What is Ego Lite? Complete guide to the Ego Lite browser and ego-browser skill for Claude Code and Cursor to automate the web using your real logged-in cookies.
i-have-adhd Skill: What It Is, Claude Setup & Zero-Fluff Coding Guide
What is the i-have-adhd skill? Master the zero-fluff coding guardrail for Claude Code, Cursor & Codex to cut conversational padding and save 60% token context.
AI Agent Book Explained: A Beginner-Friendly Roadmap from Agent Basics to Real Engineering
A friendly practical guide to ai-agent-book: what it is, how to use it, when to use it, and how beginners can learn AI Agents through a clear 2-week path.
AI Berkshire Explained: Turning Claude Code and Codex into a Disciplined Investment Research Team
A practical breakdown of AI Berkshire: a multi-agent value investing framework with structured skills, bias guards, and financial rigor tooling.
AI Job Search Explained: An Open Framework That Turns Claude Code Into a Job-Hunt Copilot
A pragmatic breakdown of ai-job-search: how it scrapes jobs, scores fit, compiles tailored LaTeX CVs, and sanitizes untrusted recruiter prompts.
Code Review Graph Explained: Smarter AI Reviews with Less Token Waste
A beginner-friendly guide to code-review-graph: how it builds a local code graph, reduces token usage, and helps AI assistants review changes with clearer impact.
OmniRoute AI Gateway: What It Is, 290+ LLMs Auto-Fallback & Setup Guide
What is OmniRoute? Complete guide to the local AI gateway: 290+ LLMs auto-fallback, 15-35% token cost reduction, and native MCP support for Claude Code & Cursor.
Orca Explained: The AI Orchestrator for Parallel Coding Agents
Orca is an open-source agent IDE that runs multiple coding agents in parallel worktrees, with native terminals, mobile steering, and CLI automation.
Strix: What It Is, How It Works & Autonomous AI Pentesting Guide
What is Strix? Explore the open-source autonomous AI pentesting and security agent (usestrix/strix) that proves vulnerabilities with reproducible sandbox exploits.
DuckDB Is Fast Because It Skips the Part Everyone Forgets
A deep dive into DuckDB internals: why an in-process SQL engine that skips the network beats clusters that cost millions, and what HN thinks about it.
Java Valhalla: Twelve Years to Delete One Assumption
Project Valhalla finally lands in JDK 28 as a preview. The story of how a decade of work boils down to one idea: let objects opt out of identity.
Agent Reach: Internet Access Without the API Bill
A Python capability layer that wires your AI agent to Twitter, Reddit, YouTube, Bilibili, and more - one install prompt, zero paid APIs.
GLM-5.2 just took the open-weights crown - and it thinks a lot
Z.ai's GLM-5.2 tops Artificial Analysis's open-weights leaderboard at 51 points, but HN is arguing about token bloat and whether benchmarks lie.
OpenMontage: Your Coding Agent Becomes the Video Director
Open-source agentic video production: 12 pipelines, 52 Python tools, 400+ skills. Claude or Cursor orchestrates research, assets, edit, and render.
Sixty percent of Americans are tired of hearing 'AI' in your ads
A WordPress VIP survey of 1,200 US consumers finds AI in brand messaging is a turnoff, and almost nobody can name a company doing it well.
TimesFM: Google's Zero-Shot Prophet for Numbers
Google Research's decoder-only foundation model forecasts time series out of the box - no per-dataset training, 200M params, quantile bands included.
last30days: The AI Skill That Searches People, Not Editors
An AI agent skill that searches Reddit, X, YouTube, HN and Polymarket for the last 30 days on any topic, scored by what real people actually engaged with.
The Wildly Simple Architecture Running Our AI Moment
A ground-up walkthrough of how transformer-based LLMs actually work - tokens, embeddings, attention, and the next-token loop - and why HN engineers can't…
Microsoft open sources pg_durable: Durable workflows inside PostgreSQL
Microsoft open sourced pg_durable, an extension that runs durable execution inside Postgres. HN argues about putting control flow back in the database.
FP4: the 16-value float powering billion-parameter models
FP4, a 4-bit float with just 16 representable numbers, is now the default inference format for billion-parameter models on NVIDIA Blackwell hardware.
Anthropic Cybersecurity Skills: The Binder Behind a Senior Analyst
754 Markdown playbooks an AI agent can load: Volatility3 runs, Kerberoasting hunts, cloud breach scoping. Mapped to ATT&CK, NIST, ATLAS, D3FEND.
Understand Anything: Graphs That Teach, Not Graphs That Impress
Claude Code plugin (also Cursor, Codex, Copilot, Gemini CLI) that turns any codebase into an interactive knowledge graph you can search and ask questions about.
Anthropic Is Now Training on Elon's Supercluster
Anthropic is expanding into xAI's Colossus2, using GB200 GPUs - after already taking the entire Colossus1. HN asks what this means for the AI race.
What if every git commit was just a folder you could browse?
Julia Evans built git-commit-folders: mount your git repo over NFS and suddenly every commit becomes a directory you can grep, vim, or pipe into anything.
When Google's Update Deletes Your IDE and Leaves a Chatbot in Its Place
Google's Antigravity 2.0 update silently replaced a working developer IDE with a chatbot at I/O 2026 - and the only fix was a full system purge.
The AI answer is an ad
Google embedded Gemini-generated ads directly into AI Mode search results. Here's what shipped, why HN is furious, and why the adblocker crowd finally has a…
Python 3.15's Most Useful Changes Flew Under the Radar
Python 3.15 ships lazy imports and a Tachyon profiler, but the quietly useful additions are TaskGroup.cancel(), fixed context manager decorators, and…
The VSCode extension that robbed GitHub
GitHub confirmed ~3,800 internal repos were stolen after one employee installed a trojanized Nx Console extension - and the attackers want $50K for the data.
Hosting a website on a $1 microcontroller
One programmer squeezed a real TCP/IP stack onto a $1 AVR chip using SLIP over serial. The site is slow, the TCP is buggy, and it loads.
A country of 500,000 just became OpenAI's first national AI experiment
Malta is giving ChatGPT Plus to every citizen who completes a 2-hour AI course. First real national AI pilot, or political vote-buying? HN has thoughts.
One minute of 720p video from a single GPU - how did we get here so fast?
SANA-WM is a 2.6B open-source world model that generates minute-long 720p video with 6-DoF camera control on one GPU. NVIDIA trained it on 64 H100s in 15 days.
XS: A 2.9 MB Binary That Is an Entire Programming Toolchain
XS packs compiler, debugger, formatter, package manager, and six backends into one 2.9 MB binary that runs on Linux, macOS, ESP32, and more.
zerostack: the coding agent that runs on 8MB, not 8GB
A solo Rust developer shipped a full-featured coding agent with an 8MB RAM footprint. HN argues about whether that even matters.
9Router: Free AI Coding With Auto-Fallback and 40% Token Savings
9Router is a local proxy that routes Claude Code, Cursor, and Cline through 40+ providers with auto-fallback, token compression, and zero-downtime quota…
Open CTFs Are Now Pay-to-Win, and Frontier AI Did It
A top-10 CTF competitor argues that Claude Opus 4.5 and GPT-5.5 have automated enough of the scoreboard that open CTFs no longer measure human security skill.
AiToEarn: Publish to 14 Platforms, Let the Agent Handle the Rest
AiToEarn is an open-source AI agent that automates content publishing, engagement, creation, and monetization across Douyin, TikTok, YouTube, Instagram, and…
Five Days vs. Five Years: Apple's New Kernel Defense, Cracked
Apple spent five years building MIE on M5 to stop kernel exploits. Calif cracked it in five days with AI, then drove to Apple Park to deliver the report.
hackingtool: All-In-One Terminal Arsenal for Pentesters
The Python TUI putting 185+ security tools - BloodHound to Nuclei - one search command away. A catalog, not a weapon.
Obsidian: Why Plain Text Notes Win in the End
Obsidian is a free, local-first Markdown app that links your notes into a personal knowledge graph. Here's why half the internet switched from Notion.
Project Gutenberg is somehow still the best part of the internet
A 1971 hobby project is still the most quietly impressive thing on the web - and HN noticed it again, with 900+ upvotes.
One Source, Two Surfaces: Anthropic's Financial Services Toolkit
10 Claude agents for investment banking, equity research, and fund admin, deployable as Cowork plugins or headless Managed Agents from a single YAML manifest.
OpenGame: The Agent That Runs the Game to See If It Works
OpenGame is a CLI agentic framework from CUHK MMLab that scaffolds, builds, and verifies browser games end-to-end from a plain-English prompt.
Pixelle-Video: One Topic, a ComfyUI Assembly Line
Streamlit app that turns a topic or script into short video: LLM copy, ComfyUI or RunningHub media, TTS, BGM, HTML templates, ffmpeg out to output/.
Maigret: The OSINT Detective That Finds Every Account
OSINT tool that checks 3,000+ platforms for a username, recursively hunts linked accounts, and generates full HTML/PDF dossiers; no API keys required.
Yellorn: The Browser Tab I Wanted for Dirty Data and Webhook Debugging
Tour Yellorn: repair broken JSON, XML, YAML, and CSV, publish mock webhooks, send HTTP requests - all private and local in your browser.
Production Google OAuth In One Prompt: I Let Cursor Drive Chrome DevTools MCP
I asked an AI agent to wire production Google OAuth. One prompt later it clicked through Cloud Console, configured scopes, and shipped to prod.
Four Principles to Stop LLMs Overengineering Your Code
A tiny CLAUDE.md and optional plugin that makes Claude Code ask, test, and edit surgically.
Android Reverse Engineering Skill: Unpacking APKs Like a Pro
A Claude Code skill that decompiles Android apps and extracts their hidden APIs - no source code required. For security pros, hackers, and the curious.
Blitz: Autopilot for App Store Submission
Native macOS App Store Connect client that automates submissions, screenshots, IAPs and agent-driven workflows via MCP.
Kronos: A Foundation Model for the Language of Financial Markets
Kronos tokenizes OHLCV K-line data and provides pre-trained autoregressive models and finetuning tools for forecasting.
The Job Search System That Evaluated 740 Offers
Career-ops turns Claude Code into a 14-mode job search agent: structured A-F evaluations, ATS-optimized PDFs, batch processing, and a Go TUI dashboard. MIT.
Context Hub: The Curated Doc Layer Every Coding Agent Needs
Context Hub (`chub`) gives AI coding agents current, versioned API docs on demand -- so they code from facts, not 18-month-old training weights.
MarkdyScript: The Mermaid of Motion
MarkdyScript is a declarative text DSL that turns 30 lines of plain code into Web Animations API scenes, git-diffable, LLM-friendly, and zero GSAP.
MarkItDown: Everything Becomes Markdown
Microsoft's Python tool converts PDFs, Office docs, audio, and YouTube URLs to clean Markdown for LLM pipelines and RAG systems.
taste-skill: The Bias Correction File for AI Frontend
taste-skill corrects the font, layout, and motion biases that push LLMs toward generic UI. A portable SKILL.md you commit once per project.
Claude Code's Missing Manual: Stop Typing and Start Orchestrating
A copy-paste survival guide that turns Claude from a basic chatbox into an automated team member.
AI Scientist-v2: The Robot That Writes Its Own Papers
SakanaAI's AI Scientist-v2 autonomously generates ML research hypotheses, runs experiments via agentic tree search, and writes peer-reviewed papers. No…
The Agent is the Model. The Code is Just a Vehicle.
A deep dive into learn-claude-code and the truth about AI agents: most frameworks are over-engineered Rube Goldberg machines.
The Conductor and the Machine: Orchestrating Claude Code
Claude Code is a beast. But to tame it, you need more than prompts. You need an orchestration framework.
Claude Skills: The Surgical Precision of Agentic Experts
A library of 200+ modular expert instruction sets and zero-dependency Python tools for AI coding agents.
VibeVoice: The Hour-Long Storyteller
AI that doesn't forget who is talking even after an hour. VibeVoice handles long-form speech without the usual 'memory loss'.
The Professional Kitchen for Your AI Agent
Everything Claude Code isn't just a config pack; it's a performance system that turns a general-purpose AI into a precision instrument.
Hermes Agent: The Desk That Remembers
Most AI agents reset every session. Hermes Agent builds a persistent workbench that learns your stack, grows its own skills, and follows you across 7 platforms.
MoneyPrinterV2: What 18,000 Stars Worth of Automated Content Actually Looks Like
An assembly line for AI content - local LLMs write the script, KittenTTS reads it, Gemini paints the pictures. The video uploads itself.
Project N.O.M.A.D.: Offline Knowledge Bunker Architecture & Setup Guide
What is Project NOMAD? Complete guide to the offline knowledge bunker (Crosstalk-Solutions/project-nomad): run local LLMs, Wikipedia, and maps without internet.
ruanyf/weekly: The Digital Lighthouse in a Sea of Algorithmic Slop
At the end of the infinite scroll, one man is still standing.
Superpowers: The Workflow That Teaches 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.
The Agency: Transform Your Workflow with a Team of AI Specialists
Discover how The Agency replaces generic prompts with a meticulously crafted roster of specialized AI agents for engineering, design, and more.
BitNet: The Era of 1-bit LLMs is Finally Here
Explore bitnet.cpp, Microsoft's official framework for 1-bit LLMs that replaces multiplications with additions for massive speedups.
Lightpanda: The Zero-Bloat Headless Browser Built in Zig
Discover Lightpanda, a headless browser built from scratch in Zig for ultra-fast AI agents and automation without the overhead of Chromium.
MiroFish: Rehearsing the Future in an AI Social Sandbox
Discover MiroFish, a universal swarm intelligence engine that uses multi-agent simulations to predict future trajectories in a digital mirror world.
How to Find the Best AI Model to Optimize Your PC Hardware
A pragmatic guide to choosing local LLMs for your GPU with LM Studio. Understand VRAM limits, quantization trade-offs, and full GPU offload.
Defuddle: What It Is, Web Content Extraction & Obsidian CLI Guide
What is Defuddle? Complete guide to kepano's TypeScript web content extractor: isolate clean article Markdown, LaTeX math, and code blocks without ads.
Khoj: Self-Host Your Personal AI Second Brain Across Obsidian and Notion
Khoj is an open-source AI second brain to chat with local LLMs, index Obsidian and Notion notes, and run custom autonomous agents locally.
OpenSandbox: What It Is, AI Agent Sandbox & Docker/K8s Setup Guide
What is OpenSandbox? Explore Alibaba's open-source universal sandbox (alibaba/OpenSandbox) to safely isolate AI coding agents in Docker and Kubernetes.
Stop Context Rot: How Get Shit Done Powers the Ultimate 10x Agentic Engine
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.
Context Engineering: The Discipline That Separates Good AI Agents from Great Ones
Open-source toolkit for Context Engineering that teaches AI agents to pull only the context they need - cited in academic research.
Unleashing the Super Agent Harness: A Deep Dive into Bytedance's DeerFlow
Discover how DeerFlow 2.0 transforms from a deep research tool into a full-fledged agent harness with sandboxing, sub-agents, and persistent memory.
GitNexus: What Is It, How It Works & MCP Codebase Setup Guide
GitNexus: what is it and how does it work? Explore how GitNexus indexes codebases with KùzuDB and MCP to prevent AI agents from breaking refactors.
Massive Collection of System Prompts for Different AI Models (700 Items)
Massive collection of system prompts for different AI models: 700+ leaked items analyzed across Cursor, Manus, Windsurf, Devin, and Claude Code.
Hugging Face Skills: The 'Plug-and-Play' Mental Model for AI Agents
What are Hugging Face Skills? A mastery guide to empowering Claude Code, Cursor, and Gemini CLI with open-source ML capabilities.
OpenBB: What It Is, Open-Source Financial Platform & Python SDK
What is OpenBB? Complete guide to the open-source financial data platform & Python SDK (OpenBB-finance/OpenBB): unify 100+ financial APIs for AI agents.
OpenClaw: Your Personal AI Assistant Across Every Channel
OpenClaw is a self-hosted AI assistant that unifies WhatsApp, Telegram, Slack, Discord, Signal, and more into one LLM-powered inbox.
PentAGI: What It Is, Autonomous AI Pentesting & Docker Setup Guide
What is PentAGI? Complete guide to the autonomous AI pentesting platform (vxcontrol/pentagi): orchestrate Kali Linux tools in Docker to exploit flaws.
Pi Mono Explained: The Anti-Framework for AI Coding Agents
Pi Mono is a radically extensible AI agent monorepo that refuses to dictate your workflow, stack, or agent framework of choice.
Shannon Explained: The Autonomous AI Pentester That Breaks Your App Before Hackers Do
Shannon by Keygraph is a fully autonomous AI penetration tester that executes real exploits - not just advice - across web apps and networks.
1 Byte = 8 Bits, So How Many Bytes Is Your Name?
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.
I Almost Ran Malware from a Fake LinkedIn Recruiter
Fake recruiter, fake repo, real malware. A step-by-step teardown of a LinkedIn scam
Fulfill Your Dirty Fantasies with ComfyUI: Uncensored Workflow Guide
Step-by-step engineering guide to running uncensored ComfyUI workflows locally on NVIDIA GPUs. Master node graphs, bypass cloud filters, and optimize VRAM.
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.
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.
AI Agents & Multi-Agent Systems: The 'Company of Robots' Mental Model
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.
Caching & Redis: The 'Sticky Note' Mental Model
Why does Redis make everything faster? A mastery guide to cache invalidation (the hardest problem in CS), eviction strategies, and Redis data types.
CDN: The 'Local Convenience Store' Mental Model
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.
CI/CD Pipeline: The 'Factory Assembly Line' Mental Model
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.
Database Indexing: The 'Library Card Catalog' Mental Model
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.
Fine-tuning vs RAG: The 'Teaching vs. Memorizing' Mental Model
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.
LLM & RAG: The 'Smart Librarian' Mental Model
Why do LLMs hallucinate? A mastery guide to Retrieval Augmented Generation (RAG) - the architecture powering every serious AI product in 2026.
MCP (Model Context Protocol): The 'USB Port for AI' Mental Model
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.
Task Queues & Message Brokers: Celery, RabbitMQ, and Kafka Untangled
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).
Observability: Logs vs. Metrics vs. Tracing - The 'Doctor's Kit' Mental Model
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.
Prompt Engineering: The 'Director & Actor' Mental Model
Why does 'be concise' produce worse results than '3 bullet points'? A mastery guide to system prompts, few-shot examples, and chain-of-thought.
Rate Limiting & Circuit Breaker: The 'Traffic Light & Fuse Box' Mental Model
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.
Why Cheap Hardware Won't Make Redis Replace a 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.
REST vs. GraphQL vs. gRPC: The 'Restaurant Menu' Mental Model
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.
Vector Databases & Embeddings: The 'Semantic Atlas' Mental Model
How does Spotify know you'll like this song? A mastery guide to embeddings, cosine similarity, and vector databases (Pinecone, Weaviate, pgvector).
When to Use Classes vs. Functions in Python: A Design Checklist
A repeatable mental checklist for Python developers to decide when to use classes, functions, instance state, and dependency injection.
When to Use Dataclasses, Generators, and Try/Except in Python
Phase 2 of the mental checklist for Python developers. Navigating dictionaries vs dataclasses, eager evaluation vs lazy execution, and error handling philosophies.
I Built a Tool to Migrate 500+ Images to WebP in One Hour
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.
Why Is Production Still Running My Old Code?
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.
Stop Bloating Your Database: The S3 Pointer Pattern
Why 10MB JSON blobs kill your buffer pool, and how to keep MySQL lean with S3 + presigned URLs.
Verify vs Cert: The Python Requests Handbook
Understanding SSL/TLS in Python Requests: The 'verify' and 'cert' arguments explained with interactive animations.
API Certificates: The Mastery Guide to Debugging & The 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.
Authentication vs. Authorization vs. OAuth: The 'ID Card' Mental Model
Stop mixing up 401 and 403. A mastery guide to AuthN (Who you are), AuthZ (What you can do), and the OAuth Valet Key.
Consistent Hashing: The 'Locker Room' Mental Model
How does Cassandra know which server stores your data? Master consistent hashing, virtual nodes, and scaling distributed systems reliably.
Docker vs. Kubernetes: The 'Hotel Manager' Mental Model
Why do I need K8s if I have Docker? A mastery guide to understanding Containers (Robots) vs Orchestration (The Manager).
Latency vs. Throughput: The 'Water Pipe' Mental Model
Why is your API slow even though your internet is fast? A mastery guide to P99 latency, bandwidth, and finding the bottleneck.
Load Balancer, Reverse Proxy, API Gateway: The Grand Hotel Mental Model
Confused by the 'Traffic Trio'? A mastery-level guide to Load Balancers, Reverse Proxies, and API Gateways - from mental models to Nginx configs.
Monolith vs. Microservices: The 'Mansion vs. Village' Mental Model
Is Microservices mostly hype? A mastery guide to the 'Distributed Monolith', Latency taxes, and knowing when to split.
Partitioning, Bucketing, Sharding, Replication, Edge: The Clean Mental Model
A precise mental model for partitioning, bucketing, sharding, replication, and edge computing - when to use each and why they exist at different layers.
SP7 - Proxy - Learn Design Pattern From Simple Things
The boss blocks social media so employees stay focused. That's exactly how the Proxy pattern works - controlling access between objects.
SQL vs. NoSQL: The 'Library vs. Warehouse' Mental Model
Why is MongoDB faster but Postgres safer? A mastery guide to Schema, ACID, and why JSONB might be the only NoSQL you need.
TCP vs. UDP: The 'Registered Mail' Mental Model
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).
SP6 - Object Pool - Learn Design Pattern From Simple Things
Manufacturing planes is expensive, but raw parts are reused from a pool. That's the Object Pool pattern - reduce creation cost with smart reuse.
SP5 - Facade - Learn Design Pattern From Simple Things
Many departments, one entrance. The Facade pattern simplifies complex systems by exposing only what you need. Learn it from simple everyday things.
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!
BP10 - Mediator - Learn Design Pattern From Simple Things
Airport control towers don't let pilots talk directly - they route everything through a hub. That's the Mediator design pattern.
BP9 - File History - Learn Design Pattern From Simple Things
Undo and redo look simple on the surface, but how do they work internally? Learn the Memento pattern from simple editing software.
BP8 - Visitor - Learn Design Pattern From Simple Things
A doctor examines every patient without the patient changing. That's the Visitor pattern - add operations to objects without modifying them.
BP7 - Template Method - Learn Design Pattern From Simple Things
Every barista follows the same coffee recipe but can swap beans and milk. That's the Template Method pattern from simple everyday things.
BP6 - State - Learn Design Pattern From Simple Things
A traffic light cycles through red, yellow, green - each state has its own behavior. Learn the State design pattern from simple things.
BP5 - Observer - Learn Design Pattern From Simple Things
Subscribers get notified the moment a new video drops. That's the Observer pattern - publishers and listeners fully decoupled.
BP4 - Handling Chain - Learn Design Pattern From Simple Things
A complaint travels through support tiers until someone handles it. That's the Chain of Responsibility design pattern explained simply.
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.
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.
CP5 - Singleton - Learn Design Pattern From Simple Things
Maintain one phone line indefinitely instead of repeatedly connecting and disconnecting. Learn the Singleton design pattern from simple things.
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.
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.
SP2 - Decorator & Function Decorator & Closure - Learn Design Pattern From Simple Things
Ice cream gets better with extra flavor - and code gets richer with the Decorator pattern. Learn closures, function decorators, and object wrapping.
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.
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.
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?
CP1 - Vending Machine (Factory) - Design Pattern From Simple Things
Beverages scattered across stores - too tiring to search each one. Learn how the Factory pattern centralizes object creation cleanly.
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.
FBP1 - Google Foobar Plus - Dodge the Lasers!
Level 5: I tried retyping `request` and Google Foobar still revealed the challenge for me
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 result
FB5 - Google Foobar - Expanding Nebula | Cellular Automaton
Level 5 of Google Foobar: Expanding Nebula, a cellular automaton problem that marks the final challenge - and the end of the journey.
FB4 - Google Foobar - Free the Bunny Workers & Escape Pods
Level 4 of Google Foobar: Free the Bunny Workers (combinatorics) and Escape Pods (max-flow) - the real coding gauntlet begins.
FB3 - Google Foobar - Doomsday Fuel & The Grandest Staircase Of Them All & Fuel Injection Perfection
Level 3 of Google Foobar: Doomsday Fuel (Markov chains), The Grandest Staircase, and Fuel Injection Perfection - where the math finally broke me.
FB2 - Google Foobar - Gearing Up for Destruction & Don't Get Volunteered
Level 2: The Math Challenge. Find the formula is the main part.
FB1 - Google Foobar - Minion Work Assignments
Level 1: The Very First Challenge. Learn how to do it and find loopholes for easier debugging.
FB0 - Google Foobar - A Godsend To Kill My Laziness
Google sent me an invitation to their secret coding challenge - here's how I got in and what the Foobar journey looked like.