Introduction Amazon DynamoDB is a fully managed NoSQL database service that powers some of the world’s most demanding applications. As a Java/e-commerce engineer, understanding DynamoDB concepts is crucial for building scalable systems. This guide breaks down essential DynamoDB terminologies using real-world examples you can relate to. 1. Table Definition: A collection of data records, similar […]
Theere is exchange of words between Jon Snow and Tyrion Lannister in the first episode of the first season of Game of Thrones. This conversation is a pivotal character-building moment where Tyrion—speaking from hard-won personal experience—teaches Jon Snow a profound lesson about surviving social rejection through psychological ownership rather than shame. The Setup: Blunt Recognition […]
This scene is a quiet philosophical debate between two AIs about humanity, mortality, and what it means to live, showing why Vision can coexist with humans while Ultron decides they must be destroyed. Ultron vs Vision: core contrast “You’re afraid” / “Of death… you’re the last one” Humanity, chaos, and “grace in their failings” Order […]
Target Audience: Software engineers with Java + AWS background Table of Contents Foundations What Observability Really Means Observability vs. Monitoring: The Critical Distinction The two terms are often used interchangeably but serve fundamentally different purposes. Understanding this distinction is essential for Tech Lead credibility. Monitoring answers the question: “What is wrong?” It uses predefined metrics, […]
Part One: The Awakening The first thing Priya notices is the silence. Not the absence of sound, but a profound quietness that feels almost deliberate—as if the world itself has chosen to hold its breath. She opens her eyes to unfamiliar walls painted a soft, institutional beige. Sunlight filters through windows that show an unchanging […]
Executive Context: Why This Matters As an architect, you’re no longer optimizing a single service—you’re designing systems that serve millions while minimizing cost and maximizing reliability. Capacity calculation is where business requirements meet technical constraints. Get it wrong, and you either waste millions on infrastructure or your system crashes during peak traffic. This is not […]
An API Gateway is a reverse proxy that manages and routes API requests between clients and backend services. The Big Picture: Where API Gateway Fits Modern applications rarely run as single monolithic programs. They consist of dozens or hundreds of independent services—user management, payments, inventory, recommendations—each with its own API. Without a gateway, clients must […]
Summary Load balancing is the mechanism that prevents any single server from becoming a bottleneck. It distributes incoming requests across multiple backend servers, ensuring no one instance is overwhelmed. Yet choosing how to distribute traffic is not trivial. Two primary architectures exist: Network Load Balancers (Layer 4), which route based on TCP/UDP primitives with microsecond […]
Executive Summary Caching is the most pragmatic tool for managing the fundamental tension in distributed systems: the need for speed and the cost of reaching persistent storage. It transforms a costly database round-trip into a sub-millisecond memory lookup, but only when implemented with clear understanding of trade-offs. This article provides a conceptual framework for senior […]
Kubernetes is an open‑source platform that automatically runs, scales, and heals containerized applications across a cluster of machines. 1. What Kubernetes is and why its components are used together Kubernetes is a container orchestration system. Containers package your app and its dependencies. Kubernetes makes sure those containers run reliably on a group of machines called […]
My Notes 