Low Level Design: ETL Service
What Is an ETL Service? Extract, Transform, Load (ETL) is the classic pattern for moving data from operational systems into […]
System Design
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Low Level Design: Billing System
What Is a Billing System? A billing system manages the full revenue lifecycle: creating subscription plans, tracking usage, generating invoices,
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Low Level Design: Content-Based Filtering Service
What Is Content-Based Filtering? Content-based filtering recommends items similar to those a user has already engaged with, based on the
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Low Level Design: Thumbnail Generator Service
What Is a Thumbnail Generator Service? A thumbnail generator service automatically produces small preview images from source assets — videos,
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Low Level Design: Image Processing Service
What Is an Image Processing Service? An image processing service accepts raw image uploads, applies a configurable set of transformations
System Design
Low Level Design: Edge Cache Service
What Is an Edge Cache Service? An Edge Cache Service is a low-latency, high-throughput caching layer deployed at the network
System Design
Low Level Design: Content Delivery Network (CDN)
What Is a Content Delivery Network? A Content Delivery Network (CDN) is a geographically distributed system of proxy servers and
System Design
Low Level Design: Token Refresh Service
What Is a Token Refresh Service? A Token Refresh Service manages the lifecycle of short-lived access tokens and long-lived refresh
System Design
Low Level Design: Experiment Framework
What Is an Experiment Framework? An Experiment Framework is the foundational infrastructure layer that enables product teams to run controlled
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Low Level Design: Distributed Transaction Manager
What Is a Distributed Transaction Manager? A Distributed Transaction Manager (DTM) coordinates operations that span multiple databases, services, or nodes
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Low Level Design: Reverse Proxy
Core Functions A reverse proxy sits between clients and upstream servers, providing: TLS termination, request routing, upstream connection pooling, response
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Low Level Design: Peer-to-Peer Network
P2P Architecture Types Two main architectures: unstructured (Gnutella) uses flood queries to locate content; structured (Kademlia DHT) provides O(log N)
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Low Level Design: Column Store Database
Column Storage Basics In a column store, each column is stored separately on disk. This enables: Reading only the columns
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Low Level Design: CRDT (Conflict-Free Replicated Data Types)
CRDT: Conflict-Free Replicated Data Types CRDTs are data structures that guarantee strong eventual consistency: any two replicas that have received
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Low Level Design: Vector Clock Service
Vector Clock Service Vector clocks track causality in distributed systems without requiring synchronized physical clocks. Each node maintains a vector