In this article, I present a case study of adopting the background job and queue model to a real system. Given the current system architecture, an improved version is proposed and the details of designing such the system from different aspects will be provided. …

This post aims to provide you an overview of how to fulfill requirements from the perspective of system design. Having said that, its content is not technology-driven, meaning that the implementation of what discussed is transparent to something like Kafka or whatever message queues like RabitMQ. …

In my previous article, I introduce the concepts of queue and background jobs via an illustrative pharmacy example, its application in practice together with advantages and limitations. This article is part two of it, reviewing different job types and how it comes to the picture via several common applications. Job Definition and Categories There…

In this article, I continue to provide you the next 3 levels of caching illustrated by the implementation of a web-based application. This is the continuation of my previous post that you can read here. Level 3: Web API with SPA At this level, the application is extended to support mobile version and single page application…

Caching plays an essential role in the success of large- (and small-) scale systems with millions of users. This is a technique or a skill or whatever you want to call, that every developer from backend to frontend, from the web to mobile, or from the new universes of ML/AI…

To many people, especially the guys working with Node.js, this topic is not quite new. There are a lot of tutorials like “Create a simple chat app using Node.js”, “Realtime chat app using Node.js Express, and Socket.io”, etc. They somehow make chat applications become a “hello world” for any of…

Just a kind note: Since Medium does not support maths equations, many of them in this post were changed to raw representation. In case you dislike reading them (as I do), you can find better content here. Introduction Previously, we introduced collaborative filtering (CF) recommendation system based on the behaviors of…

Just a kind note: Since Medium does not support maths formula, many of them in this post were changed to raw representation. In case you dislike reading them (as I), you can find better content here. Introduction I introduced Content-based Recommendation Systems in the last article, which aims to provide item…

Introduction As a netizen, probably you have met the following facts many times: Youtube automatically plays clips related to the one that you are watching. And especially when you are at its homepage, Youtube also automatically suggests clips that you find interesting. Have you ever noticed the section [Frequently bought together]…