Search

Lessons (40)

• Storage, Search and Location Queries

  Use the right data system for files, text search and nearby-place queries instead of forcing every need …

• Binary Search

  … search on a condition Binary search works on anything where a yes/no question flips exactly once : text …

• Embeddings, Semantic Search, and RAG

  … Combine vector search with keyword search or metadata filters when they improve the task. A practical RAG pipeline …

• Trees & Binary Search Trees

  … Learn the vocabulary, the four traversals, and how binary search trees give fast lookups. The big idea A …

• Design a Logging and Monitoring Platform

  Ingest high-volume telemetry reliably, separate hot search from cheap retention, and make alerting useful rather than noisy …

• State Management (Redux, Zustand, TanStack Query)

  … often forgotten Filters, search terms, pagination and tabs belong in the URL : they survive a refresh, can be …

• DSA Interview Patterns Cheat Sheet

  … 4. Optimise: "The bottleneck is the inner search… a hash map makes that O(1)." Name the pattern …

• Design a Ride-Sharing Service

  … Both see Driver D because the geo index is only a search index. The assignment service must atomically …

• Developer Learning Plan and Document-Assistant Capstone

  … Save it as document search.py and run python3 document search.py . python import re documents = [ {"id": "deploy …

• Stacks & Queues

  … vs Queue in search The only difference between depth-first and breadth-first search is the container: mermaid …

• Data Structures for Scale

  … Use geohash or spatial trees to narrow location candidates, search neighboring cells, then compute exact distance. 2. Use …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … the easiest way to implement the outbox pattern or to stream database changes to search indexes and warehouses …

• What Is Artificial Intelligence? A Developer's Guide

  … AI includes both learned models and techniques such as symbolic rules and search. It does not imply human …

• What Is Apache Kafka?

  … everything talks to everything"] A1[Web app] -- D1[(DB)] & S1[Search] & AN1[Analytics] & M1[Monitoring] A2[Mobile API …

• Graphs: BFS & DFS

  … Learn how to store a graph and explore it with breadth-first and depth-first search. The big …

• Big-O Notation Made Simple

  … That's why binary search is so fast. The 4 rules for calculating Big-O 1. Drop constants …

• Observability: Logs, Metrics & Traces

  … hard to search, no context console.log("Payment failed for user 42"); // ✅ Structured (pino): every field is searchable …

• Design an E-Commerce Checkout

  … catalog/search are read paths while inventory, payment and order transitions are owned and idempotent](/img/system-design …

• What to Learn in AI, and in What Order

  … staged deliverables and a runnable local document-search project. Make small projects that answer a real question: classify …

• Cross-Service Data: How to Join Without a Database JOIN

  … Build a dedicated read model For dashboards, search and complex screens, create a read model designed specifically for …

• Meaningful Names

  … Make names searchable and pronounceable js // ❌ Try searching for "5" or saying "genymdhms" in a meeting if (status …

• Hash Maps & Sets

  … library with a million books, you don't search shelf by shelf. You look up the book in …

• SQL vs NoSQL Databases

  … It's relational, rock solid, and it also handles JSON ( jsonb ), full-text search and geospatial data. Add …

• Atomic Design & Component Libraries

  … br/ Button, Input, Icon, Text] -- M[Molecules<br/ Search field, Form field] M -- O[Organisms<br/ Header, Checkout …

• AI Agents and Tool Use

  … A “search orders” tool is safer than arbitrary database access; a “draft refund” action is safer than an …

• React Hooks in Practice

  … a box that doesn't trigger renders jsx function SearchBox() { const inputRef = useRef(null); // 1. reference a DOM …

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

  … a static marketing homepage, ISR product pages, an SSR search page and a client-heavy dashboard. Key takeaways …

• CloudWatch: Know What Your App Is Doing

  … Check dashboard metrics for time and scope. 3. Search logs using the request ID or error. 4. Check …

• Design a Polite Web Crawler

  … normalize, deduplicate and schedule per host. The problem in context A search product wants to crawl 100 million …

• Database Internals, Replication and Scaling

  … relational, document, key-value, wide-column, graph, time-series, search and vector stores solve different queries. Diagnose before …

• Capacity, Availability, Latency and CAP

  … an older value Availability is more valuable. Product search Show a slightly old index Checkout will verify later …

• Multi-Region and Disaster Recovery

  … payments. Restaurant menus Serve regional cache; refresh later. Search/recommendations Degrade or use stale replica. Images Multi-region …

• Cluster Networking, DNS and NetworkPolicies

  … with fewer than 5 dots are tried against search domains first. External lookups such as api.stripe.com …

• Observability and Incident Response

  … structured, searchable events with no secrets or unnecessary private data. - Runbooks: owner, safe mitigation, rollback, verification and escalation …

• DRY: Don't Repeat Yourself

  … Rule of Three before extracting. Try it yourself Search your project for a number like 0.2 , 100 …

• Comments & Formatting

  … formatting with Prettier and ESLint. Try it yourself Search your project for // . For each comment ask: Could a …

• Two Pointers & Sliding Window

  … Learn them with animated-style diagrams and classic interview examples. Two Pointers The big idea Two people searching …

• Arrays & Strings

  … 0, x) O(n) Items after i shift Search (unsorted) arr.includes(x) O(n) Check lockers one …

• Recursion & Backtracking

  … permutations, combination sum, N-Queens, Sudoku solver, word search in a grid, generating valid parentheses. Key takeaways - Recursion …

• Serverless Architecture

  … confirmation"] -- SES["📧 SES"] DDB -- stream L3["λ update search"] -- OS[(OpenSearch)] Limits and trade-offs Limitation Typical value …