Event-Driven Architecture System Design
What is Event-Driven Architecture In event-driven architecture (EDA), services communicate by publishing and consuming events rather than making direct synchronous […]
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System Design
Learn to design scalable, reliable systems that handle millions of users. System design interviews test your ability to architect real-world applications, considering tradeoffs, scalability, and best practices.
Core Topics:
Scalability: Load balancing, horizontal vs vertical scaling
Storage: Databases (SQL vs NoSQL), caching (Redis, Memcached)
Reliability: Replication, failover, disaster recovery
Performance: CDNs, caching strategies, database indexing
Common Design Questions:
Design URL shortener (bit.ly)
Design rate limiter
Design Twitter/Instagram feed
Design messaging system (WhatsApp)
Design file storage (Dropbox)
Interview Level: Senior engineers (L5+) at FAANG companies. Requires 3-5+ years experience to tackle effectively.
Preparation: Study system design patterns, understand distributed systems fundamentals, and practice mock interviews.
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Analytics Data Pipeline System Design
Analytics Data Pipeline System Design Analytics pipelines move raw events from user actions into queryable dashboards. The core challenge: volume
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Recommendation System Low-Level Design
Recommendation System Low-Level Design Recommendation systems are one of the highest-ROI components in consumer products. They solve the discovery problem:
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Content Delivery Network (CDN) System Design
What a CDN Does A Content Delivery Network serves content from geographically close edge nodes, dramatically reducing latency. A request
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Stock Exchange Order Matching System Design
Core Concepts A stock exchange at its core is a system that matches buyers and sellers. The central data structure
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Message Queue System Low-Level Design
Message queues like Kafka, RabbitMQ, and SQS show up in both system design and low-level design interviews. Understanding the internals
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URL Shortener System Low-Level Design
Requirements Functional requirements for a URL shortener: Create a short URL from a long original URL Redirect users from the
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Payment System Low-Level Design
Payment State Machine A payment must move through well-defined states. Never allow arbitrary transitions or skipped states. INITIATED -> PROCESSING
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Distributed Cache System Low-Level Design
Caching is the single highest-leverage optimization in most systems. A well-designed cache can cut database load by 90% and reduce
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Search Autocomplete System Low-Level Design
Search autocomplete is one of the most latency-sensitive features in any product. Users expect suggestions within 100ms of each keystroke.
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Rate Limiter System Low-Level Design
Rate limiting is a core system design topic. This guide covers every major algorithm, their trade-offs, and Redis implementation patterns
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User Authentication System Low-Level Design
Authentication is one of the most common low-level design questions in system design interviews, and one of the most commonly
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Access Control System Low-Level Design
Core Models: ACL, RBAC, ABAC, ReBAC Access control models define how permissions are assigned and evaluated. Each has different tradeoffs
System Design
System Design: A/B Testing Platform – Experiment Management, Assignment, and Statistical Analysis (2025)
System Design: A/B Testing Platform An A/B testing platform lets product teams run controlled experiments – assigning users to variants,
System Design
Low-Level Design: Workflow Engine – DAG Execution, Step Retry, and State Persistence (2025)
Low-Level Design: Workflow Engine A workflow engine executes directed acyclic graphs (DAGs) of steps, handling parallelism, retries, and failure propagation.