🗄️Caching
Caching Strategies
Cache Aside, Read/Write Through, Write Back/Around
⏱ 5 min🏢 Facebook
◈All Guides241 guides
🗑️Caching
Cache Eviction
LRU, LFU, FIFO, TTL policies
⏱ 4 min🏢 Redis
🌍Caching
CDN Architecture
Edge caching for global delivery
⏱ 6 min🏢 Cloudflare
🔢Database
Database Sharding
Horizontal partitioning at scale
⏱ 7 min🏢 Instagram
📋Database
DB Replication
Master-Slave vs Multi-Master
⏱ 6 min🏢 MySQL
🤔Database
SQL vs NoSQL
Database selection framework
⏱ 8 min🏢 Various
📊Database
CQRS & Event Sourcing
Separate read/write models
⏱ 10 min🏢 Banking
📑Database
Database Indexing
B-Tree, Hash, Full-text indexes
⏱ 6 min🏢 PostgreSQL
🔌Database
Connection Pooling
Reuse DB connections efficiently
⏱ 5 min🏢 PgBouncer
🌸Database
Bloom Filter
Probabilistic membership testing
⏱ 6 min🏢 Cassandra
⚖️Load Balancing
Load Balancer Types
L4 vs L7 load balancing
⏱ 5 min🏢 AWS
🎯Load Balancing
LB Algorithms
Round Robin, Weighted, Least Conn
⏱ 6 min🏢 Nginx
🚪Load Balancing
API Gateway
Single entry for microservices
⏱ 6 min🏢 Netflix
🔌Load Balancing
Circuit Breaker
Prevent cascade failures
⏱ 5 min🏢 Netflix
📬Messaging
Message Queue
Async processing with queues
⏱ 6 min🏢 RabbitMQ
📢Messaging
Pub/Sub Pattern
Fan-out event messaging
⏱ 5 min🏢 Google
🌊Messaging
Kafka Streaming
Log-based messaging at scale
⏱ 8 min🏢 LinkedIn
🔄Messaging
Saga Pattern
Distributed transactions
⏱ 9 min🏢 E-commerce
💀Messaging
Dead Letter Queue
Handle failed messages
⏱ 5 min🏢 AWS SQS
🧩Architecture
Microservices
Distributed services architecture
⏱ 10 min🏢 Netflix
🏗️Architecture
Mono vs Micro
When to choose each
⏱ 7 min🏢 Shopify
⚡Architecture
Serverless
FaaS patterns and use cases
⏱ 6 min🏢 AWS
📱Architecture
Backend for Frontend
Client-specific APIs
⏱ 5 min🏢 SoundCloud
🕸️Architecture
Service Mesh
Sidecar proxy for microservices
⏱ 8 min🏢 Lyft
⚡Architecture
Event-Driven
Loosely coupled event architecture
⏱ 7 min🏢 Uber
🔑Security
OAuth 2.0
Authorization framework
⏱ 8 min🏢 Google
🎫Security
JWT Auth
Stateless token auth
⏱ 6 min🏢 Auth0
⏱️Security
Rate Limiting
Token bucket, sliding window
⏱ 7 min🏢 Stripe
🔐Security
SSO (Single Sign-On)
One login for multiple apps
⏱ 6 min🏢 Okta
⚖️Distributed
CAP Theorem
C vs A trade-offs
⏱ 6 min🏢 Various
💍Distributed
Consistent Hashing
Data partitioning
⏱ 7 min🏢 Cassandra
🤝Distributed
Consensus
Raft and Paxos
⏱ 10 min🏢 etcd
🔒Distributed
Distributed Locking
Coordinate across nodes
⏱ 7 min🏢 Redis
👑Distributed
Leader Election
Single coordinator selection
⏱ 6 min🏢 ZooKeeper
✌️Distributed
Two-Phase Commit
Atomic distributed transactions
⏱ 8 min🏢 Spanner
🔌API Design
REST vs GraphQL vs gRPC
API protocol comparison
⏱ 8 min🏢 Various
🔗API Design
WebSocket
Real-time bi-directional
⏱ 6 min🏢 Slack
📄API Design
API Pagination
Cursor vs Offset
⏱ 5 min🏢 Twitter
🏷️API Design
API Versioning
Evolve APIs without breaking
⏱ 5 min🏢 Stripe
🪝API Design
Webhooks
Push-based event notifications
⏱ 5 min🏢 GitHub
☸️DevOps
Kubernetes
Container orchestration
⏱ 10 min🏢 Spotify
🔄DevOps
CI/CD Pipeline
Build, test, deploy
⏱ 7 min🏢 GitHub
🔵DevOps
Blue-Green Deploy
Zero-downtime
⏱ 5 min🏢 Netflix
🐤DevOps
Canary Deploy
Gradual rollout strategy
⏱ 5 min🏢 Google
🚩DevOps
Feature Flags
Toggle features dynamically
⏱ 5 min🏢 LaunchDarkly
👁️DevOps
Observability
Logs, Metrics, Traces
⏱ 8 min🏢 Datadog
🔗System Designs
URL Shortener
Design bit.ly
⏱ 12 min🏢 Bit.ly
🐦System Designs
Twitter Feed
Timeline & fan-out
⏱ 15 min🏢 Twitter
💬System Designs
Chat System
Real-time messaging
⏱ 14 min🏢 WhatsApp
🎬System Designs
Video Streaming
Upload, transcode, deliver
⏱ 15 min🏢 YouTube
🚗System Designs
Ride Sharing
Matching & geo-indexing
⏱ 14 min🏢 Uber
🔔System Designs
Notification System
Push, SMS, Email at scale
⏱ 12 min🏢 Facebook
🔍System Designs
Search Engine
Inverted index & ranking
⏱ 15 min🏢 Elasticsearch
💳System Designs
Payment System
Transactions & ledger
⏱ 14 min🏢 Stripe
🛒System Designs
E-commerce System
Cart, inventory, checkout
⏱ 15 min🏢 Amazon
📁System Designs
File Storage
Distributed file system
⏱ 12 min🏢 Dropbox
🎫System Designs
Ticketing System
High-demand booking
⏱ 12 min🏢 Ticketmaster
🔁Load Balancing
Retry Pattern
Exponential backoff & jitter
⏱ 5 min🏢 AWS SDK
🚢Load Balancing
Bulkhead Pattern
Isolate failures
⏱ 5 min🏢 Hystrix
⏸️Messaging
Backpressure
Handle overwhelming load
⏱ 6 min🏢 RxJava
🗺️Distributed
MapReduce
Distributed data processing
⏱ 10 min🏢 Hadoop
🌊Messaging
Stream Processing
Real-time data pipelines
⏱ 8 min🏢 Flink
🔀DevOps
Data Pipeline
ETL & data orchestration
⏱ 8 min🏢 Airflow
🏗️Caching
Multi-tier Cache
L1 local + L2 distributed
⏱ 6 min🏢 Netflix
👥Security
RBAC
Role-based access control
⏱ 6 min🏢 AWS IAM
🔐Security
API Keys & Secrets
Secure credential management
⏱ 5 min🏢 HashiCorp
🎯API Design
Idempotency
Safe retries & duplicates
⏱ 5 min🏢 Stripe
💓DevOps
Health Checks
Liveness & readiness probes
⏱ 4 min🏢 Kubernetes
📉Load Balancing
Graceful Degradation
Fail gracefully under load
⏱ 5 min🏢 Netflix
🛡️System Designs
Content Moderation
AI + human review pipeline
⏱ 10 min🏢 Facebook
🔍DevOps
Distributed Tracing
Request flow across services
⏱ 7 min🏢 Jaeger
🔎Architecture
Service Discovery
Dynamic service registration
⏱ 6 min🏢 Consul
🏍️Architecture
Sidecar Pattern
Auxiliary containers
⏱ 5 min🏢 Kubernetes
🌳Architecture
Strangler Fig
Incremental migration
⏱ 6 min🏢 Legacy
📖Database
Read Replicas
Scale reads horizontally
⏱ 5 min🏢 Aurora
📝Database
Write-Ahead Log
Durability & recovery
⏱ 6 min🏢 PostgreSQL
📈Database
Time-Series DB
Optimized for metrics
⏱ 6 min🏢 InfluxDB
🕐Distributed
Vector Clock
Ordering distributed events
⏱ 8 min🏢 Dynamo
🗣️Distributed
Gossip Protocol
Peer-to-peer propagation
⏱ 7 min🏢 Cassandra
🗳️Distributed
Quorum
Majority consensus reads/writes
⏱ 6 min🏢 Cassandra
🔗Caching
Request Coalescing
Batch duplicate requests
⏱ 5 min🏢 Nginx
🔥Caching
Cache Warming
Pre-populate cache
⏱ 4 min🏢 CDN
🕸️API Design
GraphQL Federation
Unified graph from services
⏱ 8 min🏢 Apollo
📊API Design
API Rate Design
Quotas, throttling, tiers
⏱ 6 min🏢 Stripe
⏳API Design
Long Polling
Server-push simulation
⏱ 5 min🏢 Slack
📡API Design
Server-Sent Events
One-way streaming
⏱ 5 min🏢 Twitter
📜DevOps
Infrastructure as Code
Terraform, Pulumi patterns
⏱ 7 min🏢 HashiCorp
🔄DevOps
GitOps
Git as source of truth
⏱ 6 min🏢 ArgoCD
🐒DevOps
Chaos Engineering
Controlled failure testing
⏱ 7 min🏢 Netflix
👥System Designs
Social Graph
Relationships at scale
⏱ 12 min🏢 Facebook
🔁Architecture
Event Loop
Non-blocking I/O model
⏱ 6 min🏢 Node.js
🔗Architecture
Connection State
Stateful vs stateless services
⏱ 5 min🏢 Various
📍Distributed
Data Locality
Compute near data
⏱ 6 min🏢 Spark
🌲Distributed
Merkle Tree
Efficient data verification
⏱ 7 min🏢 Bitcoin
✅Database
Checksum
Data integrity verification
⏱ 4 min🏢 HDFS
🗑️Database
Soft Delete
Recoverable data removal
⏱ 4 min🏢 Various
🌐Caching
Content Delivery
Global edge distribution
⏱ 7 min🏢 Akamai
🪣Security
Token Bucket Deep
Advanced rate limiting
⏱ 6 min🏢 AWS
🗺️Load Balancing
Geo-Routing
Location-based traffic steering
⏱ 6 min🏢 Cloudflare
📰System Designs
News Feed
Ranked content aggregation
⏱ 14 min🏢 Facebook
📐Architecture
Horizontal vs Vertical
Scale out vs scale up
⏱ 5 min🏢 Various
🔀Load Balancing
Proxy Patterns
Forward & reverse proxy
⏱ 6 min🏢 Nginx
⚛️Database
ACID Transactions
Database transaction guarantees
⏱ 6 min🏢 PostgreSQL
🔓Database
Optimistic Locking
Version-based concurrency
⏱ 5 min🏢 Various
🌡️Database
Hot/Cold Data
Data tiering strategy
⏱ 5 min🏢 S3
💗Distributed
Heartbeat
Node liveness detection
⏱ 5 min🏢 ZooKeeper
🧠Distributed
Split Brain
Network partition handling
⏱ 7 min🏢 Elasticsearch
🤝Distributed
Hinted Handoff
Temporary failure recovery
⏱ 6 min🏢 Cassandra
🔧Distributed
Read Repair
Fix stale data on read
⏱ 5 min🏢 Cassandra
🔄Distributed
Anti-Entropy
Background data sync
⏱ 6 min🏢 Dynamo
📦Messaging
Batch Processing
Scheduled bulk operations
⏱ 6 min🏢 Spark
🚦Load Balancing
Throttling
Request rate control
⏱ 5 min🏢 AWS
↩️Load Balancing
Reverse Proxy
Server-side proxy patterns
⏱ 5 min🏢 Nginx
🐘Caching
Thunder Herd
Cache expiration stampede problem
⏱ 6 min🏢 Facebook
🎯Caching
Cache Penetration
Non-existent data attacks
⏱ 5 min🏢 Redis
💥Caching
Cache Breakdown
Hot key expiration handling
⏱ 5 min🏢 Redis
🔄Caching
Cache Crash
Recovery strategies & warmup
⏱ 6 min🏢 Memcached
📊Caching
8 Caching Levels
Multi-tier caching architecture
⏱ 8 min🏢 Netflix
☸️DevOps
K8s Architecture
Control plane & worker nodes
⏱ 10 min🏢 CNCF
🎨DevOps
K8s Patterns
Top 10 Kubernetes design patterns
⏱ 12 min🏢 Red Hat
🛠️DevOps
K8s Tools Stack
Kubernetes ecosystem tools
⏱ 8 min🏢 CNCF
🔒Security
Container Security
Image scanning & pod security
⏱ 7 min🏢 Aqua
🌐Distributed
OSI Model
7 layers of network communication
⏱ 8 min🏢 ISO
📊API Design
HTTP Status Codes
Complete guide to 1xx-5xx codes
⏱ 6 min🏢 IETF
🔐Security
SSL/TLS Handshake
HTTPS connection establishment
⏱ 7 min🏢 Cloudflare
🔑Security
SSH Protocol
Secure shell architecture
⏱ 6 min🏢 OpenSSH
🔢Distributed
IPv4 vs IPv6
Address format comparison
⏱ 5 min🏢 IANA
📡Distributed
TCP vs UDP
When to use each protocol
⏱ 6 min🏢 Various
🌍Distributed
Network Protocols
Top 8 protocols explained
⏱ 8 min🏢 IETF
🔐Security
OAuth 2.0 Flows
Authorization Code, Client Credentials, PKCE
⏱ 10 min🏢 Google
🎫Security
Session vs Token
Session, Cookie, JWT comparison
⏱ 8 min🏢 Auth0
🔒Security
Data Protection
Encoding vs Encryption vs Tokenization
⏱ 7 min🏢 Stripe
🛡️Security
DevSecOps
SAST, DAST, IaC security pipeline
⏱ 9 min🏢 Snyk
📋Security
Security Domains
12 security domains cheat sheet
⏱ 12 min🏢 OWASP
⚠️Security
API Security
OWASP API Top 10, injection prevention
⏱ 8 min🏢 Cloudflare
🔑Security
API Auth Methods
API Keys, OAuth, JWT, Basic Auth
⏱ 7 min🏢 AWS
🌲Database
DB Data Structures
Skiplist, SSTable, LSM Tree, B-Tree
⏱ 10 min🏢 LevelDB
⚡Database
SQL Optimization
Execution plans, index strategies
⏱ 8 min🏢 PostgreSQL
🔄Database
DB Transactions
ACID, isolation levels, deadlocks
⏱ 9 min🏢 MySQL
📐Database
6 Database Models
Flat, Hierarchical, Relational, Star, Snowflake
⏱ 8 min🏢 Various
🔀Database
Sharding Guide
Range, Hash, Consistent Hashing, Virtual Buckets
⏱ 10 min🏢 Vitess
🐘Database
PostgreSQL Ecosystem
Extensions: Timescale, pgVector, PostGIS
⏱ 8 min🏢 PostgreSQL
🧩Architecture
Microservices Practices
9 best practices for microservices
⏱ 10 min🏢 Netflix
🏭Architecture
Production Components
9 essential components for production
⏱ 9 min🏢 Uber
🔎Architecture
Service Discovery
Consul, Eureka, DNS-based discovery
⏱ 7 min🏢 HashiCorp
🔍DevOps
Distributed Tracing
Jaeger, Zipkin, OpenTelemetry
⏱ 8 min🏢 Uber
💓Distributed
Heartbeat Detection
6 mechanisms for failure detection
⏱ 7 min🏢 ZooKeeper
📡Architecture
Communication Patterns
Sync vs Async, Choreography vs Orchestration
⏱ 8 min🏢 Various
☁️Cloud
Cloud Service Comparison
AWS vs Azure vs GCP - 25+ services mapped
⏱ 12 min🏢 Multi-cloud
🔄Cloud
Disaster Recovery
Backup, Pilot Light, Warm Standby, Hot Standby
⏱ 10 min🏢 AWS
💰Cloud
Cloud Cost Reduction
6 strategies for cloud cost optimization
⏱ 8 min🏢 FinOps
🗺️Cloud
AWS Learning Roadmap
Services categorized by domain
⏱ 15 min🏢 AWS
⚖️Cloud
Cloud Load Balancers
AWS vs Azure vs GCP LB selection guide
⏱ 8 min🏢 Multi-cloud
🎬System Designs
Netflix Tech Stack
Complete architecture: Mobile, Web, Spring Boot, Cassandra
⏱ 15 min🏢 Netflix
📈System Designs
Netflix API Evolution
Monolith → Gateway → GraphQL Federation
⏱ 12 min🏢 Netflix
💬System Designs
Discord Architecture
MongoDB → Cassandra → ScyllaDB evolution
⏱ 12 min🏢 Discord
🔴Database
Redis Architecture
Data structures, persistence, clustering, sentinel
⏱ 10 min🏢 Redis
🚗System Designs
Uber Tech Stack
Real-time systems, mapping, dispatch architecture
⏱ 14 min🏢 Uber
📋Architecture
12-Factor App
Cloud-native application principles
⏱ 12 min🏢 Heroku
🔄Architecture
SDLC Models
8 software development lifecycle models
⏱ 10 min🏢 Various
🎨Architecture
Design Patterns
GoF patterns cheat sheet
⏱ 15 min🏢 Various
⚖️Architecture
System Trade-offs
10 key system design trade-offs
⏱ 10 min🏢 Various
🔀Database
Data Pipeline
ETL vs ELT, batch vs streaming
⏱ 10 min🏢 Airflow
🏞️Database
Data Lake vs Warehouse
Architecture comparison
⏱ 8 min🏢 Snowflake
📡Database
Change Data Capture
Debezium, Kafka Connect, CDC patterns
⏱ 9 min🏢 Debezium
📊Messaging
Kafka Deep Dive
Internals, message loss, partitioning
⏱ 12 min🏢 Confluent
🔍System Designs
Search Engine
Crawling, indexing, ranking architecture
⏱ 12 min🏢 Google
🔎Database
Elasticsearch
Shards, replicas, cluster management
⏱ 10 min🏢 Elastic
🤖Architecture
Generative AI Stack
LLMs, RAG, AI development landscape
⏱ 15 min🏢 OpenAI
🐧DevOps
Linux Boot Process
BIOS/UEFI → GRUB → Kernel → systemd
⏱ 8 min🏢 Linux Foundation
📁DevOps
Linux File System
FHS directory structure and hierarchy
⏱ 7 min🏢 Linux Foundation
🔐Security
Linux Permissions
chmod, chown, octal notation explained
⏱ 6 min🏢 Linux
📊DevOps
Linux Performance Tools
vmstat, iostat, netstat, perf, strace
⏱ 10 min🏢 Brendan Gregg
💻DevOps
Linux Commands
18 most-used commands with examples
⏱ 8 min🏢 Linux
📋API Design
REST Best Practices
Pagination, filtering, error handling
⏱ 8 min🏢 Stripe
🕸️API Design
GraphQL Deep Dive
N+1 problem, schema design, resolvers
⏱ 10 min🏢 Meta
⚡API Design
gRPC Internals
Protocol buffers, streaming types
⏱ 9 min🏢 Google
🚪API Design
API Gateway Patterns
Aggregation, transformation, routing
⏱ 8 min🏢 Kong
🔀Load Balancing
Proxy vs Gateway vs LB
Clear comparison of infrastructure
⏱ 7 min🏢 Nginx
📈API Design
GraphQL Adoption
4 patterns: Client, BFF, Monolithic, Federation
⏱ 8 min🏢 Apollo
🔄API Design
Polling vs Webhooks
When to use each, retry mechanisms
⏱ 6 min🏢 GitHub
🗺️API Design
API Protocols Landscape
REST, GraphQL, gRPC, WebSocket, Webhook
⏱ 10 min🏢 Various
📺System Designs
Live Streaming
Video capture, transcoding, RTMP/HLS, CDN
⏱ 12 min🏢 Twitch
🔔Messaging
Push Notifications
FCM, APNs, push architecture
⏱ 8 min🏢 Firebase
🔗API Design
WebSocket Deep Dive
Connection lifecycle, heartbeats, scaling
⏱ 9 min🏢 Discord
🔄DevOps
CI/CD Pipeline
Plan, develop, build, test, release flow
⏱ 10 min🏢 GitHub
⚙️DevOps
Config Management vs IaC
Terraform, Ansible, CloudFormation comparison
⏱ 8 min🏢 HashiCorp
🐳DevOps
Docker Deep Dive
Client, daemon, registry, image layers
⏱ 10 min🏢 Docker
🌳DevOps
Git Workflows
Git flow, GitHub flow, trunk-based
⏱ 7 min🏢 Various
⚡DevOps
Web Performance Metrics
Load Time, TTFB, FCP, LCP, CLS
⏱ 8 min🏢 Google
🚀DevOps
Frontend Performance
8 optimization tips for faster sites
⏱ 7 min🏢 Various
⏱️Distributed
Latency Numbers
L1/L2 cache, RAM, SSD, network latencies
⏱ 6 min🏢 Jeff Dean
📉Distributed
Latency Reduction
Indexing, caching, CDN, async strategies
⏱ 8 min🏢 Various
🗑️Caching
Cache Eviction Policies
LRU, LFU, MRU, SLRU, FIFO comparison
⏱ 8 min🏢 Redis
🏗️Caching
Two-Tier Caching
In-memory + distributed cache layers
⏱ 7 min🏢 Netflix
🔴Caching
Redis Sentinel & Cluster
16384 hash slots, sharding, failover
⏱ 10 min🏢 Redis
🔄Distributed
High Availability Patterns
Hot-Hot, Hot-Warm, RTO/RPO
⏱ 9 min🏢 AWS
🏛️Architecture
Software Architecture
Microkernel, Space-Based, Pipe-Filter
⏱ 10 min🏢 Various
🛡️Distributed
Fault-Tolerant Systems
6 principles for resilient systems
⏱ 8 min🏢 Netflix
🧱Architecture
SOLID Principles
SRP, OCP, LSP, ISP, DIP explained
⏱ 9 min🏢 Various
📊Messaging
Kafka Use Cases
Log analysis, CDC, recommendations
⏱ 10 min🏢 LinkedIn
☁️Messaging
Cloud Messaging Patterns
Async Reply, Claim Check, Priority Queue
⏱ 8 min🏢 Azure
📬Messaging
Kafka 101
Producer, Consumer, Broker, Topic basics
⏱ 8 min🏢 Confluent
💳System Designs
Credit Card Economics
Interchange fees, merchant discount
⏱ 7 min🏢 Visa
💰System Designs
Payment Gateway
Authorization, capture, settlement flow
⏱ 9 min🏢 Stripe
🔒Security
Sensitive Data Management
GDPR, RBAC, key management
⏱ 8 min🏢 Various
🌲Database
B-Tree Deep Dive
Disk-based operations, index structure
⏱ 10 min🏢 PostgreSQL
🗄️Database
NoSQL Types
Document, Key-Value, Column, Graph
⏱ 9 min🏢 Various
⭐Database
Star & Snowflake Schema
OLAP optimization, data warehousing
⏱ 8 min🏢 Snowflake
📋Database
Database Design
Normalization, keys, constraints cheatsheet
⏱ 8 min🏢 Various
📝Resources
Top Engineering Blogs
Netflix, Uber, Cloudflare, Meta, LinkedIn blogs
⏱ 5 min🏢 Various
📚Resources
Top Books for Developers
Pragmatic Programmer, Clean Code, DDIA
⏱ 6 min🏢 Various
📄Resources
Transformative CS Papers
Dynamo, GFS, BigTable, Borg, Kafka papers
⏱ 8 min🏢 Google/Amazon
🌐Resources
Open Source by Big Tech
React, Kubernetes, TensorFlow, VS Code
⏱ 6 min🏢 Various
🤝Resources
Soft Skills Books
Communication, leadership, career growth
⏱ 5 min🏢 Various
📊Resources
Diagrams as Code
Mermaid, PlantUML, Diagrams.py tools
⏱ 6 min🏢 Various
💡Resources
Coding Principles
DRY, YAGNI, KISS, separation of concerns
⏱ 7 min🏢 Various
🗺️Resources
Full-Stack Roadmap
Frontend, backend, databases, deployment
⏱ 8 min🏢 roadmap.sh
🏗️Resources
Software Architect Path
From developer to architect knowledge map
⏱ 9 min🏢 Various
🔒Security
Cybersecurity Roadmap
Security fundamentals to advanced topics
⏱ 8 min🏢 Various
⚙️Resources
Backend Developer Roadmap
Languages, databases, APIs, deployment
⏱ 8 min🏢 roadmap.sh
🔄DevOps
DevOps Roadmap
CI/CD, containers, cloud, monitoring
⏱ 8 min🏢 roadmap.sh
📐Architecture
UML Class Diagrams
Classes, relationships, multiplicity notation
⏱ 7 min🏢 Various
🧮Architecture
Programming Paradigms
OOP vs Functional vs Procedural comparison
⏱ 8 min🏢 Various
♻️Architecture
Garbage Collection
Java, Python, Go memory management
⏱ 9 min🏢 Various
⚡Distributed
Concurrency vs Parallelism
I/O-bound vs CPU-bound, threads vs processes
⏱ 8 min🏢 Various
🔁Architecture
JavaScript Event Loop
Call stack, microtasks, macrotasks explained
⏱ 8 min🏢 Various
⚙️Resources
C++ Use Cases
Embedded, games, OS, databases, HFT
⏱ 6 min🏢 Various
🎨Architecture
CSS Fundamentals
Selectors, Flexbox, Grid, animations
⏱ 7 min🏢 Various
🧱Architecture
OOP Principles
Encapsulation, Abstraction, Inheritance, Polymorphism
⏱ 8 min🏢 Various
🌐Load Balancing
Why Nginx is Popular
Event-driven architecture, use cases
⏱ 6 min🏢 Nginx
💬System Designs
Slack Notification Tree
When to DM, channel, or email decision tree
⏱ 4 min🏢 Slack
📱Security
QR Code Login
How WeChat/WhatsApp QR login works
⏱ 5 min🏢 WeChat
📌System Designs
Pinterest Git Optimization
Monorepo challenges and solutions
⏱ 7 min🏢 Pinterest
📚System Designs
Stack Overflow Architecture
Monolith at scale case study
⏱ 8 min🏢 Stack Overflow
💋Architecture
KISS Principle
Keep It Simple, Stupid in practice
⏱ 4 min🏢 Various
🔧API Design
API Client Tools
Postman, Insomnia, Thunder Client comparison
⏱ 5 min🏢 Various
🏷️DevOps
Semantic Versioning
Major.Minor.Patch versioning explained
⏱ 4 min🏢 Various
🔐Security
VPN Architecture
Site-to-site vs client VPN explained
⏱ 6 min🏢 Various
🧠Architecture
Memory Stack vs Heap
RAM hierarchy, allocation strategies
⏱ 7 min🏢 Various
💱System Designs
International Payments
Currency conversion, SWIFT, cross-border
⏱ 8 min🏢 SWIFT