Recommendation Feedback Loop: Overview A recommendation system without a feedback loop becomes stale. The feedback loop closes the cycle: collect […]
Graph Search System: Overview A graph search system enables queries over a network of nodes and edges — users, connections,
What Is an ML Feature Store? An ML feature store is a centralized system for computing, storing, versioning, and serving
Why Model Serving Is Not Trivial Deploying a model to production is an engineering discipline separate from training one. A
Why a Dedicated Experiment Platform? A/B testing sounds simple — split users, measure a metric, run a t-test — but
Database Schema Migration System Low-Level Design A schema migration system manages the evolution of a database schema alongside application code.
Data Lake Architecture Low-Level Design A data lake is a centralized repository that stores structured and unstructured data at any
Streaming ETL Pipeline Low-Level Design A streaming ETL pipeline continuously consumes events from a message broker, transforms them in real
Load Balancer Low-Level Design A load balancer distributes incoming network traffic across a pool of upstream servers, ensuring no single
Database Connection Pool Low-Level Design A database connection pool maintains a set of pre-established connections to a database server, lending
Query Optimizer Low-Level Design A query optimizer transforms a parsed SQL query into an efficient execution plan. The optimizer evaluates
A secrets management system stores, distributes, and rotates sensitive credentials — database passwords, API keys, TLS certificates, and cloud credentials
An audit logging system records every significant action in a platform — who did what to which resource, when, and
A health check service continuously probes every service in a platform, aggregates results through a dependency graph, classifies health states,
What Is an Address Validation Service? An address validation service takes raw user-entered address text, standardizes it to a canonical
