Technical Logbook

When I first heard terms like tokens, embeddings, self-attention, and transformers, they sounded complicated. After my first class on Generative AI and Agentic AI, I realized that these concepts are not as difficult as they seem. In this blog, I'll explain how modern AI models like ChatGPT work in the simplest way possible. If you're just starting your AI journey, this article is for you. In this blog, I'll explain how modern AI models like ChatGPT work in the simplest way possible. If you're just starting your AI journey, this article is for you.

A backend developer's honest journey into React Native with Expo — covering the mental model shift, navigation, state management, API integration, and how backend skills transfer to mobile development.

A backend developer's guide to essential AWS services — covering EC2, RDS, S3, SQS, CloudFront, and building a production-ready deployment architecture with Auto Scaling and load balancing.

Learn how to containerize Node.js applications with multi-stage Docker builds, optimize image sizes, handle environment variables, and deploy with Docker Compose for development and production.

Practical system design principles for backend engineers — covering scalability patterns, load balancing, database replication, caching layers, and how to approach system design interviews.

An evaluation of pool database systems vs. schema-based and table-level tenant isolation patterns for microservices.

Build a production-grade authentication system in Node.js — covering JWT access tokens, refresh token rotation, password hashing with bcrypt, and common security pitfalls to avoid.

A blueprint on implementing hierarchical permission matrices in Express.js middleware using bitwise operations and MongoDB caching.

A practical guide to designing and implementing RBAC in Node.js applications — covering permission models, middleware design, hierarchical roles, and database schema patterns.

End-to-end guide for building multi-tenant SaaS applications with Node.js — covering tenant isolation, subscription billing with Stripe, webhook handling, and production deployment.

A deep dive into event-driven architecture with RabbitMQ — covering exchanges, queues, dead-letter handling, retry strategies, and real-world patterns for Node.js microservices.

Deep dive into database indexing strategies, explain analyze readouts, and why connection pooling is vital for high-concurrency Node.js microservices.

Learn when and how to use Redis as a cache layer in Node.js applications — covering cache-aside, write-through, TTL policies, cache invalidation, and distributed locking.

Practical strategies for making MongoDB blazing fast — from compound indexes and covered queries to aggregation pipeline optimizations and connection pooling.

A comprehensive guide to designing clean, scalable, and maintainable REST APIs with Node.js and Express.js — covering project structure, validation, error handling, versioning, and security.