Migrate monolith APIs to micro-services using NestJs framework. Keep height test coverage with integration and unit tests.

Build and Maintain REST APIs using NestJs framework. Keep height test coverage with integration and unit tests.

A long journey with many challenges. The project is a no-code app builder to collect data from clients' users and use it to build BI reports. The journey started by implementing the integration tests for the whole project. After that, I worked on changing the app DB from Firestore to Postgres, which included intense typing challenges using Typescript Generics. I also suggested and implemented many solutions to simplify our architecture, including replacing a micro-service with a private npm package and merging micro-services into a single monolithic application. The last significant improvement I suggested and implemented was using OLAP instead of OLTP for analytical queries. Which reduced the execution time by 300x (from 20h to 4 min).

This is my first project with the Javascript modern stack. The project was a Ride-sharing app, something like Uber. We've been only two freelancers on the web team. And there was a lot to learn, starting with RESTful API best practices and testing with Mocha to real-time updates using Socket IO. The frontend was good practice for the Pluralsight course: "AngularJs Patterns: Clean Code".

Developing desktop applications for the healthcare sector using C#, WPF (MVVM), Entity Framework, DevExpress, and White (UI tests).

REST API developement