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• CORS Explained: Why the Browser Blocks Your RequestBackend · A plain-English guide to CORS: origins, preflight requests, the response headers your API must send and how to fix CORS errors safely, built on one running example of an embedded paint widget.25 min read · Updated 21 Oct 2026
• CQRS Explained: Separate Reads and Writes Only When It PaysSystem design · A plain-English guide to CQRS: what it is, how a separate read model stays in sync, how to handle lag, and when it is not worth it, shown on one running example of a doctor booking app.24 min read · Updated 21 Oct 2026
• How Browsers Render a Page: The Critical Rendering PathFrontend · A plain-English guide to the critical rendering path, from HTML bytes to pixels, built on one running example of a light Hindi news site for cheap phones.20 min read · Updated 21 Oct 2026
• Delivery Time Prediction: Designing a Food-Delivery ETA ModelAI and GenAI · A plain-English guide to delivery time prediction for food apps: ETA parts, live rider signals, quantile ranges, coverage checks and serving, shown on one running example of a delivery app.23 min read · Updated 21 Oct 2026
• Design a Code Deployment System: Build, Artifacts, RolloutSystem design · A plain-English guide to deployment system design: the build, the artifact store, gradual rollout and automatic rollback, shown on one running example of a lending company's payout service.25 min read · Updated 21 Oct 2026
• Design Patterns Every Engineer Should KnowSystem design · A plain-English guide to creational, structural and behavioural design patterns in Java, and when not to use them, shown on one running example of an online saree store's checkout.29 min read · Updated 21 Oct 2026
• Design a Distributed Logging SystemSystem design · A plain-English guide to designing a distributed logging system that collects, ships, stores and searches logs, built on one running payments app example.27 min read · Updated 21 Oct 2026
• Document AI Pipeline: OCR Plus LLM for KYC DocumentsAI and GenAI · A plain-English guide to document AI pipelines: field schemas, OCR and model extraction, confidence scores, validation checks, human review and audit trails, shown on one running example of a digital lender's KYC checks.27 min read · Updated 21 Oct 2026
• How Amazon DynamoDB Works: Partitions, Capacity and DurabilitySystem design · A plain-English guide to DynamoDB architecture: how partitions, request routers, adaptive capacity and three-way copies work, shown on one running example of an online shop's festival sale counter.25 min read · Updated 21 Oct 2026
• Choosing and Upgrading Embedding Models Without DowntimeAI and GenAI · A plain-English guide to choosing an embedding model with your own data instead of leaderboards, then re-embedding every document without search downtime, built on one running case-law search example.27 min read · Updated 21 Oct 2026
• Embeddings Explained: Meaning as NumbersAI and GenAI · A plain-English guide to embeddings: vectors, dimensions, cosine similarity, how embedding models learn, what they are good and bad at, built on one running second-hand book marketplace example.23 min read · Updated 21 Oct 2026
• Enterprise RAG System Design: A Finance Team AssistantAI and GenAI · A plain-English guide to enterprise RAG system design: requirements, scale, ingestion, permissions, retrieval, citations, testing, cost and rollout, shown on one running example of a finance team's policy assistant.26 min read · Updated 21 Oct 2026
• Event-Driven Architecture with Fan-Out QueuesBackend · A plain-English guide to event-driven architecture: SNS and SQS fan-out, filters, retries, dead-letter queues and duplicate-safe consumers, shown on one running example of an online store's checkout.24 min read · Updated 21 Oct 2026
• Feature Stores Explained: Same Features in Training and ServingAI and GenAI · A plain-English guide to feature stores: how one set of feature definitions feeds both model training and live predictions, built on one running loan app example.24 min read · Updated 21 Oct 2026
• Feed Ranking System Design: Engagement vs WellbeingAI and GenAI · A plain-English guide to the ML side of feed ranking: candidate sources, multi-task predictions, a value model, wellbeing signals, testing and feedback loops, built on one running neighbourhood app example.24 min read · Updated 21 Oct 2026
• Fine-Tuning Case Study: A Model for Hospital Billing CodesAI and GenAI · A plain-English guide to a fine-tuning case study: how a fine-tuned small model can beat RAG at turning discharge notes into billing codes, shown on one made-up but realistic hospital coding team.24 min read · Updated 21 Oct 2026
• Fine-Tuning vs RAG vs Prompting: Which One Do You Need?AI and GenAI · A plain-English decision guide to prompting, RAG and fine-tuning: what each one changes, what it costs, how to test it and how to combine them, built on one running event-planning example.26 min read · Updated 21 Oct 2026
• Forward Deployed Engineer: Role, Skills and RoadmapInterview prep · A plain-English guide to the forward deployed engineer role: how it differs from an AI solutions architect, daily work, skills, a roadmap, the interview and career paths, told through one running example.25 min read · Updated 21 Oct 2026
• Fraud Detection System Design for UPI PaymentsAI and GenAI · A plain-English guide to fraud detection system design: rules plus a model, features, label delay, cost-based thresholds, analyst review and drift, shown on one running example of a UPI payments app.24 min read · Updated 21 Oct 2026
• Frontend Accessibility and i18n: Design for Every UserFrontend · A plain-English guide to frontend accessibility and internationalization, built on one running example: a pension web app used by retirees in 12 Indian languages.25 min read · Updated 21 Oct 2026
• Frontend Security: XSS, CSRF and CSP ExplainedFrontend · A plain-English guide to frontend security: how XSS, CSRF and clickjacking work and how to block them, built on one running credit society portal example.26 min read · Updated 21 Oct 2026
• GenAI System Design Interview: How the Round WorksInterview prep · A plain-English guide to the GenAI system design interview: how it is scored, how to spend 45 minutes, and a worked insurance Q&A answer, built on one running example.25 min read · Updated 21 Oct 2026
• How Google Spanner Works: TrueTime and Global ConsistencySystem design · A plain-English guide to how Google Spanner uses TrueTime, atomic clocks, commit wait and Paxos to give one global order to transactions, shown on one running example of a remittance ledger.24 min read · Updated 21 Oct 2026
• Gossip Protocols and Failure DetectionSystem design · A plain-English guide to gossip protocols and failure detection, from heartbeats to SWIM and phi accrual, built on one running cache cluster example.25 min read · Updated 21 Oct 2026