Eduardo Calderón Rodríguez

A JavaScript/Python-based back-end system, hosted on AWS, that powers a mobile app that teaches primary and middle school kids math.

The back end handles authentication; student, teacher, and tutor account management; and the logic for more than 250+ exercises, divided into grades and topics (algebra, geometry, trigonometry, and so on).

I like this project in particular because it highlights some interesting aspects of software development:
- Building a solution capable of handling thousands of users efficiently
- Crafting good code for generating the math problems
- Using algorithms, data structures, and other computer science topics to both serve the math problems but also manage the users

In the beginning stage of the project, the back-end system was conceived and implemented as a monolith due to its fast development and easy maintenance at a low to mid-level. As the application was growing, the number of users and math problems were increasing, the application was transitioned into microservice architecture, decoupling the modules and making the whole system faster, reliable, and easy to maintain for any developer that integrates to the team.

I would consider finances to be my second passion aside from tech and software. That is why, with the help of a colleague, we are building an MVP for a finance tracker called YABA (Yet another budget app).

At its beginning stage, it will be a set of serverless Node.js (with TypeScript) functions hosted on AWS for the back end, using DynamoDB as storage.

I was in charge of the development of the back end of a multilevel marketing business branch in the Dominican Republic. The platform manages users and presents statistics about their network and sales numbers.

It was developed using Node.js with TypeScript using Heroku as a hosting platform.