⏱ 7 min read Problem Statement and Requirements An event streaming platform extends a basic message broker with features required for long-lived, schema-evolving data […] Read article

⏱ 5 min read Requirements and Constraints A distributed cron service triggers jobs on time-based schedules (standard cron expressions) across a fleet of nodes Read article

⏱ 5 min read Requirements and Constraints A consensus service provides a strongly consistent, fault-tolerant replicated state machine that multiple clients can use to Read article

⏱ 5 min read Requirements and Constraints A leader election service ensures that exactly one node in a cluster acts as leader at any Read article

⏱ 6 min read Problem Scope and Requirements JWTs are stateless by design — once issued, they are valid until expiry. A Token Revocation Read article

⏱ 6 min read Problem Scope and Requirements A Session Manager maintains authenticated user sessions across stateless HTTP services. The core challenges are fast Read article

⏱ 6 min read Problem Scope and Requirements A Key Management Service (KMS) manages cryptographic keys throughout their lifecycle: generation, storage, rotation, and destruction. Read article

⏱ 6 min read Problem Overview An inventory reservation system allows multiple systems (e-commerce checkout, warehouse management, wholesale orders) to place temporary holds on Read article

⏱ 6 min read Problem Overview A live auction system allows bidders to compete in real time, with each bid potentially triggering updates for Read article

⏱ 6 min read Problem Overview Game state synchronization keeps all clients and the authoritative server in agreement about the game world in real Read article

⏱ 5 min read Problem Overview A matchmaking service groups players into balanced game sessions based on skill, latency, and preference. The system must Read article

⏱ 5 min read Email Sending Flow The end-to-end path from application event to recipient inbox: Application calls the email service API with recipient, Read article

⏱ 7 min read Device Token Storage A device token is a provider-issued opaque string that identifies a specific app install on a specific Read article

⏱ 6 min read Notification Schema Every notification is a structured record created before any delivery is attempted: notification_id: UUID or Snowflake — unique Read article

⏱ 7 min read Ingestion Pipeline Raw video files uploaded by content creators or production teams enter a processing pipeline before they can be Read article