System Design Notes
Scalable distributed architectures, high-availability design, caching, databases, and microservices. Explore full concept breakdowns, handwritten formulas, and interview-ready reference handbooks.
Horizontal and Vertical Scaling
Architectural breakdown of scaling stateless application tiers, autoscaling policies, database scaling limitations, and vertical hardware bottlenecks.
Load Balancing & Algorithms
Layer 4 vs Layer 7 load balancers, reverse proxies, health checks, Round Robin, Least Connections, and IP Hash algorithms.
Caching Strategies (Redis & Memcached)
Cache-aside, write-through, write-back patterns, cache invalidation strategies, eviction policies (LRU, LFU), and Redis clusters.
Database Sharding & Replication
Primary-replica replication, read replica distribution, horizontal partitioning, range vs hash sharding, and cross-shard queries.
CAP Theorem & Distributed Consensus
Consistency, Availability, and Partition Tolerance trade-offs, PACELC theorem, eventual consistency, and distributed consensus.
Rate Limiting Algorithms
Token bucket, leaky bucket, fixed window counter, and sliding window log algorithms for API throttling and DDoS protection.
Content Delivery Networks (CDN)
Edge caching, Points of Presence (PoPs), Anycast routing, static asset acceleration, and cache invalidation strategies at global scale.
API Design and Advanced API Concepts
Comprehensive study notes for API Design and Advanced API Concepts.
Consistent Hashing
Distributed hash rings, virtual nodes, load balancing across nodes, and minimizing key remapping during server additions and failures.
Asynchronous Processing and Message Queues
Comprehensive study notes for Asynchronous Processing and Message Queues.
Database Indexing & Query Optimization
B-Trees, B+ Trees, clustered vs non-clustered indexing, composite indexes, hash indexes, and optimizing high-throughput database queries.
Authentication and Authorization
Comprehensive study notes for Authentication and Authorization.
System Design: TinyURL Shortener
End-to-end interview walkthrough: capacity estimation, unique base62 encoding, low-latency redirection, caching, and rate limiting.
Architecture and Design Patterns
Comprehensive study notes for Architecture and Design Patterns.
Message Queues & Asynchronous Processing
Decoupled architectures, message brokers (Kafka, RabbitMQ), publisher-subscriber models, dead-letter queues, and backpressure handling.
Security
Comprehensive study notes for Security.
Microservices vs Monolithic Architecture
Trade-offs of modular monoliths vs microservices, domain-driven boundaries, service discovery, distributed transactions, and Saga patterns.
Caching and Redis
Comprehensive study notes for Caching and Redis.
REST API Design & Protocols
RESTful resource modeling, HTTP status codes, idempotency, API versioning, pagination patterns, rate limiting headers, and security.
Computer Networks for Backend
Comprehensive study notes for Computer Networks for Backend.
SQL vs NoSQL Database Selection
ACID vs BASE properties, relational schema normalization vs document and key-value flexibility, and selecting the optimal database paradigm.
Concurrency and Multithreading
Comprehensive study notes for Concurrency and Multithreading.
Core Backend Fundamentals
Comprehensive study notes for Core Backend Fundamentals.
Database Concepts
Comprehensive study notes for Database Concepts.
Deployment and Infrastructure
Comprehensive study notes for Deployment and Infrastructure.
Reliability Monitoring and Debugging
Comprehensive study notes for Reliability Monitoring and Debugging.
Scalability and System Design
Comprehensive study notes for Scalability and System Design.
Testing for Backend Developers
Comprehensive study notes for Testing for Backend Developers.