System Design & Architecture

Load Balancing — Algorithms, Configurations, and Best Practices Explained

Learn how load balancers distribute traffic across servers using round robin, least connections, and IP hash. NGINX config examples, health checks, and real-world usage.

Caching Strategies — Write-Through, Write-Around, Write-Back Explained with Examples

Learn caching strategies for CDN, application, and database layers. Redis and Memcached examples, cache invalidation patterns, TTL, and real-world tradeoffs.

Content Delivery Network — How CDNs Work, Benefits, and Configuration Explained

Learn how CDNs use edge servers to deliver content faster, reduce latency by 60%, and absorb DDoS attacks. CloudFront, Cloudflare, origin pull vs push explained.

Message Queues — Pub/Sub Architecture with RabbitMQ, Kafka, and SQS Explained

Learn how message queues decouple services using producer-consumer patterns. RabbitMQ, Kafka, SQS examples, use cases for async processing, buffering, and decoupling.

Rate Limiting — Token Bucket, Leaky Bucket, and Sliding Window Algorithms Explained

Learn rate limiting algorithms used by APIs: token bucket, leaky bucket, sliding window log. Python implementations with API gateway configuration examples.

Microservices Design Patterns — Service Discovery, Circuit Breaker, Saga, CQRS Explained

Learn essential microservices patterns: API gateway, service discovery, circuit breaker, saga orchestration, CQRS, and event sourcing with real-world examples.

API Design Principles — RESTful Resource Naming, Versioning, Pagination, and Error Handling

Learn RESTful API design principles: resource naming conventions, versioning strategies, pagination, error response formats, and idempotency with real examples.

Distributed Systems — CAP Theorem, Consistency Models, Consensus Algorithms Explained

Learn distributed systems fundamentals: CAP theorem, strong vs eventual consistency, Paxos and Raft consensus, and challenges like network partitions and clock skew.

Consistency Models — Strong, Eventual, Causal Consistency and CRDTs Explained

Learn distributed consistency models: strong, eventual, causal, and read-your-writes consistency. CRDTs, tradeoffs, and when to use each model in real systems.

CDN Deep Dive — Edge Servers, Cache Invalidation, and Geo-Routing Explained

Master content delivery networks: edge server architecture, origin pull vs push, cache invalidation strategies, geo-routing, DDoS protection, and CDN provider comparison.

Design Twitter/Instagram: Social Media Feed Architecture

Learn to design social media feeds: fan-out on write vs read, push/pull hybrid, ML-based relevance ranking, caching strategy, WebSocket real-time updates, CDN media storage, and notification systems.

Design Amazon: E-Commerce Platform Architecture

Learn to design an e-commerce platform like Amazon: product catalog denormalization, shopping cart persistence with Redis, order processing workflow, saga pattern for payments, inventory management, recommendation engine, and search with Elasticsearch.

Message Queues Deep Dive — RabbitMQ vs Kafka vs SQS with Routing and Delivery Guarantees

Master message queue architecture: RabbitMQ exchanges, Kafka partitions, SQS FIFO, at-least-once vs exactly-once delivery, routing strategies, consumer groups, and dead letter queues.

Distributed Caching — Redis Cluster, Memcached, and Multi-Tier Cache Strategies

Master distributed caching: Redis Cluster vs Memcached, cache-aside/read-through/write-through patterns, eviction policies (LRU, LFU, TTL), cache stampede prevention, and multi-tier caching.

Microservices Communication — REST, gRPC, Events, and Service Mesh Patterns

Master inter-service communication: synchronous (REST, gRPC) vs asynchronous (events, messaging), service mesh (Istio, Linkerd), API gateway patterns, circuit breaker, and retry with exponential backoff.

URL Shortener Design — Advanced Architecture and Performance Optimization

Design a high-performance URL shortener with distributed ID generation, Bloom filters for duplicate detection, hot-key caching, analytics pipeline, and 99.99 percent uptime architecture.

Distributed Consensus: Paxos, Raft & Leader Election Explained

Learn distributed consensus algorithms: Paxos (basic, multi-Paxos, Fast Paxos), Raft (leader election, log replication, safety), Zab, gossip protocol, quorum, and fault tolerance.

Observability: Metrics, Tracing & Logging at Scale

Learn observability: RED and USE methods for metrics, distributed tracing with OpenTelemetry/Jaeger/Zipkin, structured logging with ELK/Loki, Prometheus alerting, SLOs/SLIs/SLAs, and Grafana dashboards.

gRPC vs REST — API Protocol Comparison for System Design

Compare gRPC and REST API protocols: performance benchmarks, streaming support, serialization formats, contract enforcement, and when to choose each for distributed systems.

Blue-Green Deployment — Zero-Downtime Deployments Guide

Learn blue-green deployment: two identical environments for zero-downtime releases, instant rollback, and safe production deployments with traffic switching.

API Gateway Pattern — Architecture, Benefits & Implementation Guide

Learn the API gateway pattern: single entry point for microservices with routing, authentication, rate limiting, and response aggregation using Kong, FastAPI, and NGINX.

Sidecar Pattern — Service Mesh Sidecars & Deployment Guide

Learn the sidecar pattern: deploying helper containers alongside microservices for logging, monitoring, and proxying with service mesh examples in Kubernetes and Istio.

Strangler Fig Pattern — Incremental Monolith to Microservices Migration Guide

Learn the strangler fig pattern for incremental monolith-to-microservices migration using route interception, feature flags, and gradual replacement without downtime.

CQRS Pattern — Command Query Responsibility Segregation Guide

Learn CQRS pattern: separating read and write models for scalable microservices, with event sourcing integration, materialized views, and real-world examples.

Saga Pattern — Distributed Transactions in Microservices Guide

Learn the saga pattern for distributed transactions in microservices: choreography vs orchestration, compensating transactions, and practical implementation with Python.

Event Sourcing — Event Store, Replay & Audit Trail Guide

Learn event sourcing: storing state changes as an append-only event log for audit trails, temporal queries, and system rebuilds with event store examples.

Blob Store Design — S3, Azure Blob & GCS Architecture Guide

Learn blob store architecture: S3-compatible object storage design with partitioning, replication, consistency, and practical implementation using MinIO.

Time-Series Database Design — InfluxDB, TimescaleDB & Prometheus Guide

Learn time-series database architecture: storage engines, downsampling, retention policies, and query optimization for metrics monitoring and IoT data.

Key-Value Store Design — DynamoDB, Redis & Cassandra Architecture Guide

Learn key-value store architecture: consistent hashing, replication, partitioning, and LSM-trees with practical Redis, DynamoDB, and Cassandra implementations.

Distributed Counter Design — Without Race Conditions Guide

Learn distributed counter design: CRDT counters, Redis increment, sharded counters, and conflict-free techniques for accurate counting at scale.

Distributed Locking — Redis, ZooKeeper & Database Locks Guide

Learn distributed locking: Redlock algorithm, ZooKeeper ephemeral nodes, database advisory locks, and lease-based locking for distributed coordination.

Leader Election — Raft, Paxos & ZooKeeper Guide

Learn leader election algorithms: Raft consensus, Paxos, ZooKeeper leader election, and Bully algorithm for distributed coordination and failover.

Distributed Queue Design — Kafka, RabbitMQ & SQS Guide

Learn distributed queue architecture: Kafka partitions, RabbitMQ exchanges, SQS at-least-once delivery, and exactly-once semantics with practical examples.

Design a Push Notification System — System Design Guide

Design a push notification system for mobile and web: FCM/APNs integration, device token management, notification queues, delivery retries, and user preferences at scale.

Real-Time Collaboration System Design — Google Docs Architecture Guide

Learn real-time collaboration system design: CRDT-based OT, WebSocket sync, operational transformation, and conflict resolution for collaborative editing.

Database Storage Engine Internals — System Design Guide

Understand database storage engine internals: B-trees, LSM-trees, page layout, MVCC, WAL, checkpointing, and buffer pool management for building and tuning databases.

Design a Content Delivery Network — System Design Guide

Design a CDN (Content Delivery Network): edge server architecture, geographic routing, cache invalidation, origin push vs pull, and performance optimization for global content delivery.

System Design Fundamentals: Architecture, Trade-offs, and Design Patterns

Learn system design fundamentals including architectural patterns, design trade-offs, scalability principles, and how to approach complex distributed system.

Client-Server Architecture: Models, Protocols, and Communication Patterns

Learn client-server architecture models including two-tier and three-tier designs, communication protocols, request-response patterns, and network topology.

Scalability Principles: Vertical Scaling, Horizontal Scaling, and Design Patterns

Learn scalability principles including vertical and horizontal scaling, stateless design, database partitioning, and caching strategies for building systems.

Latency and Throughput: Performance Metrics, Optimization, and Bottlenecks

Learn about latency and throughput as key performance metrics, optimization techniques, common bottlenecks, and how they affect distributed system design.

CAP Theorem: Consistency, Availability, and Partition Tolerance Trade-offs

Learn the CAP theorem explaining trade-offs between consistency, availability, and partition tolerance in distributed systems and how databases balance them.

Availability Patterns: Failover, Replication, and Redundancy Strategies

Learn high availability patterns including failover strategies, data replication, redundancy techniques, and SLA calculations for resilient distributed.

DNS and Load Balancing: Domain Resolution, Geo-Routing, and Traffic Distribution

Learn how DNS works with load balancing including domain resolution, geo-based routing, round-robin DNS, and global traffic distribution strategies for.

Load Balancing Algorithms: Round Robin, Least Connections, and IP Hash

Learn load balancing algorithms including round robin, least connections, IP hash, weighted distribution, and how each strategy affects server resource.

Horizontal vs Vertical Scaling: Approaches, Costs, and Trade-offs

Learn the differences between horizontal and vertical scaling, cost implications, architectural trade-offs, and when to choose each approach for system.

Reverse Proxy Patterns: Nginx, HAProxy, and API Gateway Integration

Learn reverse proxy patterns using Nginx and HAProxy including request forwarding, SSL termination, caching, rate limiting, and API gateway integration.

Rate Limiting Strategies: Token Bucket, Leaky Bucket, and Sliding Window

Learn rate limiting strategies including token bucket, leaky bucket, sliding window, and distributed rate limiting for protecting APIs from traffic abuse.

Consistent Hashing: Distributed Key Distribution and Rebalancing

Learn consistent hashing for distributing data across nodes with minimal rebalancing, virtual nodes for load distribution, and applications in caching.

Auto Scaling Strategies: Metrics, Policies, and Cloud Implementation

Learn auto scaling strategies including metric-based scaling, schedule-based policies, predictive scaling, and cloud implementation patterns for handling.

Health Checks and Monitoring: Heartbeats, Circuit Breakers, and Alerting

Learn health check patterns including heartbeat protocols, circuit breakers, health endpoints, and monitoring dashboards for maintaining system reliability.

SQL vs NoSQL: Database Types, Use Cases, and Selection Criteria

Learn the differences between SQL and NoSQL databases, their strengths and weaknesses, use cases for each, and criteria for selecting the right database.

Database Sharding: Horizontal Partitioning, Shard Keys, and Routing

Learn database sharding techniques including horizontal partitioning, shard key selection, query routing, and rebalancing strategies for distributed data.

Database Replication: Master-Slave, Multi-Master, and Synchronous Replication

Learn database replication strategies including master-slave, multi-master, synchronous and asynchronous replication, and conflict resolution for data.

Database Indexing: B-Trees, Hash Indexes, and Query Optimization

Learn database indexing strategies including B-tree indexes, hash indexes, bitmap indexes, and query optimization techniques for improving read performance.

Database Caching: Query Cache, Result Cache, and Write-Through Strategies

Learn database caching strategies including query result caching, write-through and write-behind patterns, cache invalidation, and integration with Redis.

Data Partitioning: Range, Hash, List, and Composite Partitioning Methods

Learn data partitioning methods including range partitioning, hash partitioning, list partitioning, and composite approaches for distributing data across.

Blob and Object Storage: S3 Architecture, Data Lakes, and Storage Classes

Learn blob and object storage architecture including S3-style storage, data lakes, storage classes, access patterns, and design considerations for large.

Caching Strategies: Read-Through, Write-Through, and Cache-Aside Patterns

Learn caching strategies including read-through, write-through, write-behind, and cache-aside patterns for improving application performance and reducing.

CDN Architecture: Edge Servers, PoPs, Content Distribution, and Caching

Learn CDN architecture including edge servers, points of presence, content routing, cache control headers, and how CDNs accelerate global content delivery.

Cache Eviction Policies: LRU, LFU, FIFO, and TTL-Based Expiration

Learn cache eviction policies including LRU, LFU, FIFO, random replacement, and TTL-based expiration for managing memory in distributed caching systems.

Redis vs Memcached: In-Memory Cache Comparison and Use Cases

Learn the differences between Redis and Memcached for caching, data structure support, persistence options, replication features, and selection criteria for.

Write-Through and Write-Behind Caching: Consistency and Durability Patterns

Learn write-through and write-behind caching patterns for maintaining consistency between cache and database, durability guarantees, and trade-offs in.

Cache Invalidation Strategies: TTL, Event-Based, and Versioning Approaches

Learn cache invalidation strategies including TTL-based expiration, event-driven invalidation, version-based approaches, and stampede protection for cache.

Edge Computing: Architecture, Use Cases, and Distributed Processing

Learn edge computing architecture including edge nodes, data processing at the edge, use cases for IoT and CDN, and design patterns for distributed compute.

Microservices Architecture: Decomposition, Communication, and Data Management

Learn microservices architecture principles including service decomposition, inter-service communication, data management patterns, and migration from.

API Gateway Patterns: Routing, Aggregation, Authentication, and Rate Limiting

Learn API gateway patterns including request routing, response aggregation, authentication, rate limiting, and protocol translation for microservices.

Service Discovery: Client-Side, Server-Side, and Service Mesh Approaches

Learn service discovery patterns including client-side discovery, server-side discovery with load balancers, and service mesh integration for microservices.

Circuit Breaker Pattern: Fault Tolerance, State Machine, and Resilience

Learn the circuit breaker pattern for fault tolerance including state machine transitions, failure detection, half-open testing, and resilience strategies.

API Rate Limiting: Strategies, Headers, and Distributed Implementation

Learn API rate limiting strategies including token bucket and sliding window, rate limit headers, distributed rate limiting with Redis, and client handling.

Containerization: Docker, Kubernetes, and Microservices Deployment

Learn containerization with Docker and Kubernetes including container orchestration, service deployment, auto-scaling, and networking for modern microservices.

Service Mesh: Istio, Linkerd, and Sidecar Proxy Architecture

Learn service mesh architecture including sidecar proxies, traffic management, observability, security policies, and Istio and Linkerd implementation.

Message Queue Systems: RabbitMQ, Kafka, and AWS SQS Architecture

Learn message queue architecture including point-to-point messaging, message brokers, consumer groups, and how RabbitMQ and Kafka handle message delivery.

Pub-Sub Pattern: Event Brokers, Topics, Subscribers, and Filtering

Learn the publish-subscribe pattern including event brokers, topic-based routing, subscriber models, message filtering, and fan-out delivery for scalable.

Kafka vs RabbitMQ: Message Broker Comparison and Selection Guide

Learn the differences between Kafka and RabbitMQ, their architectural models, throughput characteristics, message delivery guarantees, and selection criteria.

Stream Processing: Apache Flink, Kafka Streams, and Real-Time Analytics

Learn stream processing concepts including event time processing, windowing, state management, and using Apache Flink and Kafka Streams for real-time.

Event-Driven Architecture: Event Sourcing, CQRS, and Event Grids

Learn event-driven architecture patterns including event sourcing, CQRS, event grids, and asynchronous event processing for building loosely coupled systems.

Idempotency in Distributed Systems: Keys, Deduplication, and Safe Retry

Learn idempotency patterns for distributed systems including idempotency keys, request deduplication, exactly-once processing, and safe retry strategies.

Exactly-Once Semantics: Delivery Guarantees in Messaging Systems

Learn message delivery semantics including at-most-once, at-least-once, and exactly-once processing, idempotent consumers, and transactional messaging.

Design a URL Shortener: TinyURL-Style System Architecture

Learn how to design a URL shortener system including key generation, base62 encoding, redirection, analytics tracking, and scalable storage for billions.

Design a Chat System: Real-Time Messaging Architecture

Learn how to design a real-time chat system including WebSocket connections, message delivery, presence tracking, group chats, and end-to-end encryption.

Design an E-Commerce Platform: Amazon-Style System Architecture

Learn how to design an e-commerce platform including product catalog, shopping cart, order processing, inventory management, and recommendation engine.

Design a Video Streaming Service: Netflix-Style Content Delivery

Learn how to design a video streaming service including content ingestion, transcoding, adaptive bitrate streaming, CDN delivery, and recommendations.

Design a Distributed Cache: Memcached-Style In-Memory Data Store

Learn how to design a distributed cache system including consistent hashing, replication, failure detection, memory management, and client-side sharding.

Design a Task Scheduler: Distributed Job Scheduling System

Learn how to design a distributed task scheduler including job queues, scheduling algorithms, worker pools, retry logic, and fault tolerance for async.

Design a Key-Value Store: DynamoDB-Style Distributed Database

Learn how to design a distributed key-value store including partitioning, replication, consistency models, failure handling, and DynamoDB-style design.

System Design Interview: Framework, Approach, and Common Questions

Learn the system design interview framework including problem-solving approach, requirement gathering, estimation, design steps, and common questions asked.

Scalability Estimation: Back-of-the-Envelope Calculations for Design

Learn back-of-the-envelope calculations for scalability estimation including QPS estimation, storage sizing, network bandwidth, and cache capacity planning.

Trade-Off Analysis: Evaluating Design Decisions in System Architecture

Learn trade-off analysis in system design including consistency versus availability, latency versus throughput, cost versus performance, and design decisions.

Whiteboarding Tips: Diagramming and Presenting System Designs Effectively

Learn whiteboarding techniques for system design interviews including diagram conventions, component notation, data flow illustration, and presentation.

System Design Cheatsheet: Quick Reference for Architecture Patterns

Learn system design patterns and concepts in a cheatsheet format covering load balancing, caching, databases, messaging, and key trade-offs for quick.

System Design Approach: Requirement Gathering to Final Architecture

Learn a structured system design approach from requirement gathering and estimation to high-level design, deep dives, and final architecture presentation.