Vanilla JS is not dead! Microfrontends without web performance issues.

Building a complex web platform can be a real challenge, especially when parts of it are delivered by independent teams. Picking out the correct architecture is crucial, but maintaining it can be even more challenging. Frontend microservices, aka microfrontends, is an architecture that gives a lot of flexibility, but can cause performance issues in the future, if not managed well. This article presents an approach to the microfrontends architecture to keep the frontend technology stack efficient based on the complexity of user interface.

Probabilistic Data Structures and Algorithms in NoSQL databases

What would you say if we stored 1 000 records in a database, and the database claimed that there were only 998 of them? Or, if we created a database storing sets of values and in some cases the database would claim that some element was in that set, while in fact it was not? It definitely must be a bug, right? It turns out such behavior is not necessarily an error, as long as we use a database that implements probabilistic algorithms and data structures. In this post we will learn about two probability-based techniques, perform some experiments and consider when it is worth using a database that lies to us a bit.

Example of modularization in Allegro Pay Android application

Currently, in the Android world, the topic of modularization is very popular. Many bloggers describe their experiences with it and analyze what Google recommends. Our team started the modularization process before it was hot. I will describe our reasons, decisions, problems and give you some advice. We will see if modularization makes sense and what it brings to the table. I will also post some statistics showing what it looked like before and after the modularization process.

How to efficiently write millions of records in the cloud and not go bankrupt — an Azure CosmosDB case study

Cloud providers like to brag about high availability and unlimited scaling of their services – and they are correct, as these features are indeed significant advantages of cloud solutions. Their computational power is so high that for most use cases, it’s almost unlimited. In this blog post, I would like to tell you about our experiences with Azure Cosmos DB and batch processing.

MBox: server-driven UI for mobile apps

In this article, we want to share our approach to using server-driven UI in native mobile apps. In 2019 we created the first version of the in-house server-driven rendering tool called MBox and used it to render the homepage in the Allegro app on Android and iOS. We have come a long way since then, and now we use this tool to render more and more screens in the Allegro apps. After almost three years of working on MBox, we want to share how it works and the key advantages and challenges of using this approach.

How to facilitate EventStorming workshops

With this article, I would like to introduce you to EventStorming and explain to you how to get started. I am not discovering anything new, just gathering available knowledge in one place. What I will show you is a few tips on how to conduct and facilitate EventStorming workshops.

At Allegro, we build and maintain some of the most distributed and scalable applications in Central Europe. This poses many challenges, starting with architecture and design, through the choice of technologies, code quality and performance tuning, and ending with deployment and devops. In this blog, our engineers share their experiences and write about some of the interesting things taking place at the company.