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Lessons (30)

• DynamoDB Modeling, RDS Scaling and Data Resilience

  Design DynamoDB tables around access patterns, then scale and protect relational databases with replicas, proxies and Multi-AZ …

• Serverless Architecture

  … create an order from an HTTP request import { DynamoDBClient } from "@aws-sdk/client-dynamodb"; import { DynamoDBDocumentClient, PutCommand } from …

• Dynamic Programming

  … You didn't recount; you remembered the previous answer. 📘 Dynamic Programming (DP) = "Don't solve the same sub …

• SQL Language, Identifiers & Data Types

  Interview answers for DDL/DML/DCL, generated IDs, UNION, static/dynamic SQL and CHAR/VARCHAR. Covers PDF questions …

• AWS Databases: Choose the Right One

  … key-value storage DynamoDB is not SQL. You design from the access pattern first: “get order by order …

• SQL vs NoSQL Databases

  … four families mermaid mindmap root((NoSQL)) Document MongoDB Firestore JSON documents Key-value Redis DynamoDB get / set by …

• Next.js Rendering: CSR, SSR, SSG, ISR & Server Components

  … render on every request export const dynamic = "force-dynamic"; // Pre-build known dynamic routes (like this app does …

• Count, for_each, Functions, and Stable Identities

  … Verify expressions with terraform console before embedding complex transformations. Dynamic blocks A dynamic block generates repeated nested blocks …

• DSA Interview Patterns Cheat Sheet

  … BFS, DFS, topological sort 6 Heaps, binary search on the answer, intervals 7 Backtracking 8 Dynamic programming Solve …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … By default, a private subnet reaches S3 or DynamoDB through a NAT gateway , which costs money per hour …

• Choosing a Programming Language

  … a middle ground. Static vs dynamic typing Static (TS, Go, Rust) Dynamic (Python, plain JS) --- --- --- When type errors …

• Resilience, Disaster Recovery and Multi-Region Design

  … Cross-Region Replication (needs versioning; replicates new objects) DynamoDB Global tables with explicitly chosen eventual or strong multi …

• NestJS Core Concepts

  … new Date().toISOString(), }); } } Dynamic modules and lifecycle hooks ts @Module({}) export class MailModule { static forRoot(options: { apiKey: string …

• Cost Optimization and the Well-Architected Framework

  … add S3 and DynamoDB gateway endpoints; use interface endpoints for heavy services; keep traffic within an AZ. 3 …

• JavaScript Language Fundamentals

  … js"; const { readFile } = await import("node:fs/promises"); // dynamic import ES modules CommonJS --- --- --- Syntax import / export require / module …

• State, Remote Backends, and Locking

  … Current HashiCorp documentation marks DynamoDB-based locking as deprecated; use native S3 locking for these new examples. See …

• Domain-Driven Design: Strategic Design

  … in-house, best people, richest model Personalised recommendations, dynamic pricing 🧰 Supporting Necessary and specific to you, but …

• Hash Maps & Sets

  … a"] = (counts["a"] ?? 0) + 1; 💡 Prefer Map for dynamic keys (user IDs, counts). Plain objects have inherited keys …

• Arrays & Strings

  … does "amortised O(1)" mean? JavaScript arrays are dynamic : when full, the engine allocates a bigger block (often …

• Recursion & Backtracking

  … 12586269025, instantly That idea is the heart of Dynamic Programming (next lesson). --- Backtracking 🧭 Analogy: Solving a maze …

• API Gateway, BFF & Service Discovery

  … how services find each other In a dynamic environment, service instances come and go (autoscaling, deploys, crashes), and …

• What Is Software Architecture?

  … flexible schema, but weaker multi-document transactions for our use case - DynamoDB: great scale, but complex queries and …

• Frontend Performance & Core Web Vitals

  … Spinner / } {showEditor && <ChartEditor / } </Suspense // Next.js const Map = dynamic(() = import("./Map"), { ssr: false, loading: () = <MapSkeleton / }); Next.js already …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … recover from bugs. - Pipes connect a source (SQS, DynamoDB stream) to a target with optional filtering and enrichment …

• Serverless: Lambda and API Gateway

  … API Gateway] G -- L[Lambda function] L -- D[DynamoDB or another service] The important settings Setting Plain meaning …

• Structural Patterns: How to Connect Objects

  … a coffee. Problem: add responsibilities to an object dynamically , without subclassing for every combination. js // Base function const …

• AWS: Start Here

  … ECS, EC2, or Lambda] A -- D[RDS or DynamoDB] A -- S[S3 files] Need AWS service to learn …

• Hexagonal Architecture (Ports & Adapters)

  … Admin UI, import job Driven ForStoringLoans ( LoanRepository ) Postgres, DynamoDB, in-memory Driven ForNotifyingMembers ( Notifier ) Email, SMS, push, console …

• Rust: Types, Errors and Concurrency

  … Shape (shapes: &[T]) - f64 { shapes.iter().map( s s.area()).sum() } // Dynamic dispatch: mixed types in one Vec …

• Scaling, Load Balancing & Rate Limiting

  … Sample targets and choose the better one Large dynamic pools Consistent hash Same key tends to reach the …