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Design a File Storage System S3 like Object Storage
Design an object storage service — metadata service, chunking, replication, consistency, and CDN integration.
tutorials
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Python
Design a Notification System Push Email & In App
Design a scalable notification system — channels, templates, priority queues, rate limiting, and user preferences.
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Design a Rate Limiter Algorithms & Implementation
Implement rate limiting — token bucket, sliding window, fixed window, Redis-based, and distributed rate limiting.
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Design a Chat Application System Design Interview Guide
Design a real-time chat system — WebSockets, message queue, delivery guarantees, presence, and group chat.
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Design a URL Shortener System Design Interview Guide
Design a URL shortener — requirements, API, database schema, hashing, caching, analytics, and scaling strategy.
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Bloom Filters & Probabilistic Data Structures Tutorial
Understand probabilistic structures — Bloom filters, Count-Min Sketch, HyperLogLog, and when to use them.
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Suffix Array & Suffix Tree String Algorithms Tutorial
Solve string problems with suffix arrays — construction, LCP array, pattern matching, and longest common substring.
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Union Find Disjoint Set Kruskal's MST & Connected Components
Track connected groups with Union-Find — path compression, union by rank, cycle detection, and Kruskal's MST.
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Segment Trees Tutorial Range Queries & Lazy Propagation
Handle range queries efficiently — segment tree build, query, update, lazy propagation, and persistent variants.
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Trie Data Structure Prefix Trees & Autocomplete
Build fast prefix lookups with tries — insert, search, prefix match, autocomplete, and word frequency counting.
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Email Authentication SPF DKIM & DMARC Setup Guide
Protect your domain's email — SPF records, DKIM signing, DMARC policies, and troubleshooting deliverability.
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SendGrid & Resend Tutorial Transactional Email APIs
Send transactional emails — SendGrid and Resend APIs, templates, webhooks, deliverability, and Node.js integration.
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MJML Tutorial Build Responsive HTML Emails 2026
Create responsive emails with MJML — components, layouts, images, and converting to HTML for email clients.
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WordPress REST API Headless WordPress with React Next js
Use WordPress as a headless CMS — REST API endpoints, custom post types, ACF fields, and React/Next.js frontend.
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Contentful Tutorial Enterprise Headless CMS Guide
Build with Contentful — content models, Content Delivery API, Rich Text rendering, and localization.
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Sanity io Tutorial Structured Content Platform Guide
Manage content with Sanity — schemas, GROQ queries, Sanity Studio, image pipeline, and Next.js integration.
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Payload CMS Tutorial TypeScript First Headless CMS
Build with Payload CMS — collections, fields, hooks, access control, and deploying with Next.js.
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Strapi Tutorial Headless CMS with Node js 2026
Build content APIs with Strapi — content types, REST/GraphQL, authentication, media, and custom plugins.
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WooCommerce Development Custom Themes & Plugins Guide
Customize WooCommerce — child themes, custom product types, payment gateways, and REST API integration.
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JazzCash & Easypaisa Integration Pakistani Payment Gateways
Integrate Pakistani payment gateways — JazzCash API, Easypaisa API, payment flow, webhooks, and testing.
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Stripe Integration Tutorial Payments Subscriptions & Checkout
Accept payments with Stripe — Checkout sessions, PaymentIntents, subscriptions, webhooks, and Pakistani PKR support.
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Medusa js Tutorial Open Source E commerce Backend 2026
Build headless e-commerce with Medusa.js — products, carts, payments, shipping, and custom plugins.
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Shopify Development Tutorial Themes Liquid & Apps 2026
Build on Shopify — Liquid templating, theme architecture, Shopify CLI, and custom app development.
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RTL Right to Left Support Arabic & Urdu Web Design
Build RTL-compatible websites for Urdu and Arabic — dir attribute, logical CSS properties, bidirectional text, and testing.
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Internationalization i18n Build Multilingual Web Apps
Add multi-language support — react-i18next, next-intl, message extraction, RTL support, and date/number formatting.