5 min read Requirements and Constraints A shipping tracker aggregates parcel status from multiple carriers (FedEx, UPS, USPS, DHL, regional last-mile), normalizes heterogeneous […] Read article
7 min read Requirements and Constraints A full-featured experiment platform extends simple A/B testing to support adaptive allocation (multi-armed bandits), holdout groups, guardrail Read article
7 min read Requirements and Constraints A cohort analysis system groups users by a shared characteristic or event at a point in time Read article
6 min read Requirements and Constraints A compliance reporting system automates the collection, aggregation, and delivery of evidence required by regulatory frameworks such Read article
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
7 min read Problem Statement and Requirements A pub/sub service enables one-to-many message delivery: publishers send messages to topics without knowing who will 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
5 min read Requirements and Constraints CQRS (Command Query Responsibility Segregation) separates write operations (commands) from read operations (queries) into distinct models, each 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 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 Key Management Service (KMS) manages cryptographic keys throughout their lifecycle: generation, storage, rotation, and destruction. 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 An inventory reservation system allows multiple systems (e-commerce checkout, warehouse management, wholesale orders) to place temporary holds on Read article
