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Lessons (30)

• Data Structures for Scale

  Use geospatial indexes and probabilistic structures to make huge queries practical while understanding their error bounds. ![Scale-oriented …

• Structural Patterns: How to Connect Objects

  … How to plug incompatible pieces together and build big structures from small ones. Why structural patterns? Structural patterns …

• What Are Design Patterns?

  … Builder, Prototype, Singleton 🧱 Structural How do I connect objects into bigger structures? Adapter, Bridge, Composite, Decorator, Facade …

• Onion Architecture & Clean vs Hexagonal vs Onion

  … frameworks & drivers mermaid flowchart LR subgraph Same["Same structure, three vocabularies"] direction LR O["Outside<br/ adapters · infrastructure …

• Observability: Logs, Metrics & Traces

  … Write structured logs (JSON), not free text, so machines can search and filter them. js // ❌ Unstructured: hard to …

• SQL Language, Identifiers & Data Types

  … DDL, DML and DCL DDL defines structures: CREATE, ALTER and DROP. DML reads/changes data: SELECT, INSERT, UPDATE …

• Code Smells & Refactoring

  … a surface sign that probably points to a deeper design problem. Refactoring means changing the structure of code …

• Monolith vs Microservices

  … start with a well-structured monolith, learn where the real boundaries are, then extract services when the pain …

• Clean Architecture in Depth

  … Entities, use cases, input and output ports, presenters, crossing boundaries with DTOs, "screaming" folder structure, testing, and common …

• Heaps & Priority Queues

  … That's a priority queue , and a heap is the clever data structure that implements it efficiently. Structure …

• Backend Languages: Node.js, Go, Python & Rust

  … NestJS (structured, TypeScript-first) NestJS adds modules, dependency injection and decorators on top of Express/Fastify, similar to …

• DSA Interview Patterns Cheat Sheet

  … O(n log n) Complexity cheat sheet Data structures Structure Access Search Insert Delete --- --- --- --- --- Array O(1) O …

• Deploying & Operating Microservices

  … one trace ID across every hop. - Structured logs including the trace ID and service name. - Golden signals per …

• What Is Software Architecture?

  … foundations and structure vs furniture and paint](/img/architecture/house-layers.svg) Architecture vs design vs code Level …

• Vertical Slice Architecture & the Modular Monolith

  … Folder structures, rules, and how to enforce boundaries. Part 1: Vertical Slice Architecture The big idea A supermarket …

• SOLID at a Glance

  … They answer one question: 🎯 How do I structure code so that a change in one place doesn't …

• Hexagonal Architecture (Ports & Adapters)

  … Driving vs driven sides, a complete TypeScript example, testing with fake adapters, and how to structure the folders …

• What Is Clean Code?

  … DRY YAGNI Errors Fail loudly No silent catch Structure Code smells Refactoring Clean Architecture The Boy Scout Rule …

• YAGNI: You Aren't Gonna Need It

  … a feature with 3 users Clear names and structure Generic BaseAbstractManager<T classes Error handling and security Caching …

• React vs Vue vs Angular

  … Vue + Nuxt] Q -- Large enterprise team,<br/ strict structure, everything built in A[Angular] 💡 The skills transfer. Components …

• Stacks & Queues

  … Two simple structures behind undo buttons, browser history, task scheduling and many interview problems. The big idea ![A …

• Clean Architecture

  … tests.- MEM[InMemoryUserRepository] I -.later?.- MG[(MongoUserRepository)] Folder structure text src/ ├── domain/ entities + business rules (no dependencies) │ └── User …

• State Management (Redux, Zustand, TanStack Query)

  … Redux Toolkit (structured) Redux is the classic, predictable pattern: one store , state changed only by dispatching actions handled …

• Arrays & Strings

  The most-used data structure. See how arrays live in memory, why some operations are instant and others …

• Layered (N-Tier) Architecture

  … code by feature instead, to fix this. Folder structure text src/ ├── presentation/ controllers, routes, DTOs, views ├── business/ services …

• Serverless Architecture

  … invest in structured logs, tracing (X-Ray / OpenTelemetry) Cost at sustained high load Containers or VMs can be …

• Helm, kubectl Cheat Sheet & Best Practices

  … from a vault NetworkPolicy scanned, pinned image Operations structured logs metrics + alerts Helm / Kustomize in git GitOps deploys …

• Choosing an Architecture

  … Q2["2️⃣ Code organisation<br/ How is code structured INSIDE each deployable?"] -- A2["Layered · Clean · Hexagonal ·<br/ Onion …

• Caching & Redis

  … more than a cache Redis is an in-memory data-structure server. Its data types solve many real …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … new operations over the same structure const evaluate = { num: (n) = n.value, add: (n, visit) = visit(n.left …