# designscalable.com ## Posts - [Designing a Scalable Notification System](https://designscalable.com/designing-a-scalable-notification-system/): Notification systems are a critical infrastructure component for modern applications. Whether it is an OTP SMS, an order confirmation email, a push notification for a social update, or an internal system alert, notifications form the bridge between backend systems and end users. At small scale, sending notifications may appear trivial. However, at scale—where millions of […] - [Designing a Scalable URL Shortener (TinyURL)](https://designscalable.com/system-design-case-study-designing-a-scalable-url-shortener-tinyurl/): Designing a URL shortener looks simple on the surface—but at scale, it becomes a classic distributed systems problem involving performance, scalability, caching, databases, and trade-offs. In this post, we will design a production-grade URL shortener using a clear 14-step system design framework that you can reuse for any system design interview or real-world architecture discussion. […] - [Distributed Coordination: Locks, Leader Election & Idempotency](https://designscalable.com/distributed-coordination-locks-leader-election-idempotency/): In distributed systems, multiple services run independently and communicate over unreliable networks.Coordinating actions across these services is challenging but essential for correctness and consistency. In this blog, we’ll explore distributed locks, leader election, and idempotency—three foundational coordination concepts. Why Coordination Is Hard Distributed systems face: Without coordination, systems may: Distributed Locks A distributed lock ensures […] - [Fault Tolerance, Failover & High Availability](https://designscalable.com/fault-tolerance-failover-high-availability/): Failures are inevitable in distributed systems.Servers crash, networks fail, and data centers go down. Good system design focuses not on preventing failures, but on handling them gracefully. In this blog, we’ll cover fault tolerance, failover, and high availability, and how modern systems stay reliable at scale. Understanding Failures in Distributed Systems Common types of failures […] - [Event-Driven Architecture & Messaging](https://designscalable.com/event-driven-architecture-messaging/): As systems grow and move toward microservices, direct synchronous communication becomes a bottleneck.Event-driven architecture (EDA) helps systems scale by allowing services to communicate asynchronously using events and messages. In this blog, we’ll cover event-driven architecture, message queues vs event streams, and when to use each. Synchronous vs Asynchronous Communication Synchronous Communication Example:Service A calls Service […] - [Microservices vs Monolith](https://designscalable.com/microservices-vs-monolith/): Choosing the right architecture is one of the most important decisions in system design.Two common approaches are monolithic architecture and microservices architecture. Each has its strengths, weaknesses, and ideal use cases. In this blog, we’ll clearly compare monoliths vs microservices, explain trade-offs, and help you decide when to use each. What Is a Monolithic Architecture? […] - [Indexing, Search & Read Optimization](https://designscalable.com/indexing-search-read-optimization/): In large-scale systems, reads dominate writes.Users expect fast responses, whether they’re searching, scrolling feeds, or loading product pages. This is why indexing and read optimization are critical parts of system design. In this blog, we’ll cover how indexes work, their trade-offs, and how search systems optimize reads at scale. What Is an Index? An index […] - [SQL vs NoSQL, Sharding & Replication](https://designscalable.com/sql-vs-nosql-sharding-replication/): As systems grow, data becomes the hardest part to scale.Choosing the right database model and scaling strategy directly impacts performance, availability, consistency, and cost. In this blog, we’ll go deeper into SQL vs NoSQL, sharding, and replication, covering all essential concepts needed for real-world system design and interviews. SQL vs NoSQL Databases SQL Databases (Relational) […] - [Caching, Databases & Storage Basics](https://designscalable.com/caching-databases-storage-basics/): As systems grow, performance and scalability become critical.Most real-world applications cannot rely on databases alone. This is where caching and proper storage choices play a key role in system design. In this blog, we’ll cover why caching is needed, how databases differ, and basic storage types—keeping it simple and practical. Why Caching Is Needed Databases […] - [Authentication, Authorization & Stateless Services](https://designscalable.com/authentication-authorization-stateless-services/): Security and scalability are core concerns in system design.Before building distributed or microservices-based systems, it’s important to clearly understand authentication, authorization, and stateless services—concepts that are often confused but fundamentally different. Authentication vs Authorization Authentication Authentication answers the question:“Who are you?” It verifies the identity of a user or system. Examples: Authorization Authorization answers the […] - [Traffic Management & APIs in System Design](https://designscalable.com/traffic-management-apis-in-system-design/): Efficient traffic management is critical for building scalable, reliable, and secure systems.As systems grow, the number of users, requests, and services increases, making it essential to understand how traffic flows and how APIs are managed. In this blog, we’ll cover load balancers, reverse proxies, API gateways, and rate limiting with examples to make the concepts […] - [CAP Theorem, ACID & BASE in System Design](https://designscalable.com/cap-theorem-acid-base-in-system-design/): Understanding how distributed systems behave is critical for building reliable software.Two key concepts that guide system behavior are the CAP Theorem and ACID/BASE properties. This blog explains these concepts simply, so you can apply them in real-world designs and interviews. CAP Theorem CAP stands for Consistency, Availability, and Partition Tolerance. Key Points: Rule: In a […] - [Scaling Basics & Estimation in System Design](https://designscalable.com/scaling-basics-estimation-in-system-design/): Scalability is one of the most important concerns in system design.It defines whether a system can grow smoothly as usage increases or collapses under pressure. Many engineers understand scalability in theory but struggle to reason about numbers.This blog focuses on simple, practical scaling concepts and basic estimation techniques that are easy to apply in real […] - [System Design Fundamentals & Interview Approach](https://designscalable.com/system-design-fundamentals-interview-approach/): System design is one of the most important skills for modern software engineers, yet it is also one of the most misunderstood. Many developers associate system design only with interviews, while others think it is relevant only for senior engineers or architects. In reality, system design is about thinking in systems — understanding how different […] - [Functional vs Non-Functional Requirements](https://designscalable.com/functional-vs-non-functional-requirements/): Every good system design starts with requirements.Before choosing databases, caches, or architectures, you must clearly understand what the system should do and how well it should do it. These two dimensions are known as functional requirements and non-functional requirements. Many system design failures — and interview failures — happen because engineers misunderstand or ignore this […] ## Pages - [System Design](https://designscalable.com/system-design/): System Design – A Practical Guide for Developers System Design is the process of defining the architecture, components, data flow, and scalability strategies of a software system. It answers questions like: In modern software engineering, writing correct code is only the starting point. Real-world systems must be scalable, available, secure, and maintainable — and that […] - [Latest](https://designscalable.com/latest/) - [Podcasts](https://designscalable.com/podcasts/) - [Contact](https://designscalable.com/contact/) - [About](https://designscalable.com/about/) - [Home](https://designscalable.com/): Hot picks! Latest Posts [comment]: # (Generated by Hostinger Tools Plugin)