Field notes from a decade of fullstack work across banking, healthcare, and global consumer platforms. Pinterest, Squarespace, now Zoom. Written between deploys.
Content Security Policy is the security layer that blocks XSS even when the attacker manages to inject HTML. Learn how to configure CSP with nonce, strict-dynamic, and without unsafe-inline.
Understand how clickjacking works, why X-Frame-Options exists, and how to use CSP frame-ancestors to protect your site from being embedded in malicious iframes.
Objects and Sets are fundamental JavaScript structures. Discover features beyond the obvious like property descriptors, set operations, and when to use each one.
Understand once and for all how JavaScript resolves variables, why closures work, and how to avoid the classic scope bugs.
HOCs were the dominant pattern in React for years. Understand how they work, when they still make sense, and why Hooks changed the game.
Pure functions, immutability, and composition in practice. Learn to use functional programming where it makes sense, without turning everything into an academic exercise.
Currying transforms multi-argument functions into chains of single-argument functions. Learn when this technique is powerful and when it's overkill.
Understand the real differences between Map and Object in JavaScript, when each one shines, and the pitfalls every dev needs to know.
Understand how CSRF attacks work, why the browser is the unwitting villain, and how to implement real protection with tokens, cookies, and headers.
HTTP/2 isn't just "faster." Understand how multiplexing, HPACK, and server push change the way you build web applications.
Learn how to implement asset versioning and hashing to solve stale cache issues, from backend upload to CDN and Service Worker.
A practical guide to Reverse Proxies: understand the differences between Nginx, Caddy, and Traefik, with configuration examples for SSL, caching, load balancing, and more.
Compare Single Tenant and Multi Tenant in depth: costs, isolation, compliance, performance. Discover which model fits your scenario.
Circuit breakers, retries, timeouts, fallbacks: the essential patterns for building resilient systems that keep working when everything goes wrong.
Understand load balancing algorithms, compare Nginx vs HAProxy vs cloud load balancers, and learn how to scale your application horizontally.
From opaque tokens to JWT with refresh token rotation, understand how session tokens work across backend, database, and frontend -- with full implementation.
Learn how to decouple heavy tasks from your API using queues, workers, and event-driven architecture. Practical examples with BullMQ, Redis, and Node.js.
A practical guide to Apache Kafka: when to use it, how it works under the hood, and how to implement producers and consumers in Node.js.
Understand RPC (Remote Procedure Call), compare gRPC, tRPC, and JSON-RPC, and discover when to use each one in your microservices architecture.
Understand why idempotency is essential for distributed systems and learn how to implement idempotent operations with practical examples in Node.js and SQL.
Duplicated data in state causes bugs and slowness. Learn how to normalize data like a relational database and simplify updates, caching, and real-time sync.
Understand Short Polling and Long Polling, how to implement each from backend to frontend, and when they're the best choice over WebSocket.
Complete guide to WebSockets: how they work, implementation with Socket.IO and ws, scaling with Redis, and when to actually use them.
Understand normal forms (1NF through 5NF), why to normalize, when to denormalize, and how to make practical decisions about database schema design.
Rate limiting algorithms (Token Bucket, Sliding Window), implementations with Redis, Express and Nginx, and how to handle 429s on the frontend.
Redis beyond the basics: data structures, pub/sub, rate limiting, queues, sessions, leaderboards and how to use it in production.
Your first Design System will fail—and that's okay. Learn why perfection is impossible, how to iterate healthily, and why continuous improvement beats upfront planning.
Build interfaces like chemists build molecules. Learn Brad Frost's 5-level methodology—atoms, molecules, organisms, templates, pages—with practical React examples.
Catch unintended CSS changes before production. Automate visual comparisons with Playwright, Chromatic, or BackstopJS and build confidence to refactor without fear.
Performance Budget: Set page weight and timing limits like a financial budget. Learn to measure with Lighthouse, automate checks in CI/CD, and make conscious decisions about every KB you add.
Learn why waterfall fails for frontend teams and how a parallel workflow with browser prototyping, CI/CD automation, and cross-discipline collaboration delivers faster, more predictable results.
It was an ordinary afternoon when someone asked a seemingly simple question: "How modular is our design? We'd like to share small parts of the theme with other company sites.” The honest answer? Nervous laughter.
When a new project starts, the first question is usually: "React or Vue? Next or Nuxt? What about Svelte?”. Rarely does anyone ask: "Do we need a framework?”.
CSS stands for "Cascading Style Sheets". The word "cascading" is beautiful, but hides a trap: styles overlap in not-always-obvious ways.
Stop writing documentation that lies. Build living style guides with Storybook where docs update automatically with code. Includes setup, MDX, addons, and CI deployment.
Write testable frontend code by breaking functions into small, single-purpose units. Learn TDD, modern tools like Vitest, realistic coverage targets, and how to test React/Vue components.
In the old web publishing world, it was common for the frontend team to have **zero control** over markup. HTML was generated by the CMS, by backend developers who had already moved on to other tasks.
Every building needs a solid foundation, four walls, and a roof. Without these elements, it's not a building — it's a pile of materials waiting to collapse.
Have you ever wondered what separates a senior frontend developer from a Frontend Architect? The answer might seem obvious at first — more experience, more responsibilities — but the reality is far more interesting.
JSX is quite straightforward: It will take 1 minute to know about this is an awesome alternative to templates.
We all know that CSS it has become even harder nowadays. You wouldn't believe it, but CSS can define properties, do the math, and even directly get the window size!
In this post, I want to go back to the basics and build a simple web server from scratch with NodeJS. In doing so, we will review the structure of HTTP requests and responses and get an introduction to Node's Stream API
I've always wanted to code a search engine from scratch and discovered that it's pretty simple. Here is an example indexer I coded using Python. The first thing we need to do is have a way to take the documents we want to search on.