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Autoscaler Low-Level Design: Metric-Based Scaling, Cooldown Windows, and Predictive Scaling

⏱ 6 min read Autoscaler: Core Responsibility An autoscaler dynamically adjusts the number of compute instances (replicas, pods, VMs) running a service based on […] Read article

Apr 17, 2026 System Design

Package Registry Low-Level Design: Artifact Storage, Version Resolution, and Dependency Graph

⏱ 6 min read Package Registry: What It Solves A package registry is a versioned artifact store for software libraries. Developers publish packages; consumers […] Read article

Apr 17, 2026 System Design

CDN Edge Cache Low-Level Design: Cache Hierarchy, Origin Shield, Cache Invalidation, and Routing

⏱ 6 min read CDN Edge Cache: What It Does A content delivery network (CDN) accelerates content delivery by caching responses at Points of […] Read article

Apr 17, 2026 System Design

Schema Evolution Low-Level Design: Protobuf Compatibility, Avro Schema Registry, and Forward/Backward Compatibility

⏱ 5 min read Compatibility Definitions Schema evolution is the ability to change a data schema over time without breaking producers and consumers that […] Read article

Apr 17, 2026 System Design

Idempotency Service Low-Level Design: Idempotency Keys, Request Deduplication, and Response Caching

⏱ 5 min read What Is an Idempotency Service? An idempotency service ensures that duplicate requests — caused by client retries, network timeouts, or […] Read article

Apr 17, 2026 System Design

Write Scaling Architecture Low-Level Design: Sharding, Write Batching, Async Processing, and CQRS Command Side

⏱ 10 min read The Write Scaling Bottleneck In a standard primary-replica setup, all writes go through a single primary database. The primary's write […] Read article

Apr 17, 2026 System Design

Lock-Free Queue Low-Level Design: CAS Operations, ABA Problem, and Memory Ordering

⏱ 9 min read What Is a Lock-Free Queue? A lock-free queue provides a progress guarantee: at least one thread makes progress even if […] Read article

Apr 17, 2026 System Design

Causal Consistency Low-Level Design: Vector Clocks, Causal Ordering, and Dependency Tracking

⏱ 8 min read What Is Causal Consistency? Causal consistency is a consistency model that sits between eventual consistency and linearizability. If operation A […] Read article

Apr 17, 2026 System Design

Session Consistency Low-Level Design: Read-Your-Writes, Monotonic Reads, and Session Token Tracking

⏱ 8 min read What Is Session Consistency? Session consistency is a client-centric consistency model that provides guarantees within the scope of a single […] Read article

Apr 17, 2026 System Design

Linearizability Low-Level Design: Single-Object Semantics, Fencing Tokens, and Atomic Register Implementation

⏱ 8 min read What Is Linearizability? Linearizability is the strongest consistency model for single-object operations. It guarantees that every operation appears to take […] Read article

Apr 17, 2026 System Design