Joao Victor Tamm

A digital certificate e-Commerce app that owns the checkout step of the purchase.

Buying a digital certificate involves multiple stages, from filling holder data to scheduling the issuance and paying. As a full-stack engineer, I had the challenge of creating both the back and front end and keeping as much business logic as possible in the back end.

The checkout stage can have multiple caveats, depending on the type of certificate and partnership so, to keep the front end as dumb as possible, I decided to run the front end in a server-driven UI. This concept consists in having the back end define which steps should be performed and which components should be rendered.

Despite the front-end part, I had to integrate with external credit card providers, fraud analysis tools, and e-invoicing issuers before concluding the purchase in the back end. Furthermore, e-mails needed to be sent, and the certificate issuance BPM process should be opened.

OBS: The project URL points to the site's homepage. Remember that only the checkout section was created by the team I've worked on.

A map-based statistics application to visualize historical soccer match data played by Clube Atlético Mineiro. The application collects data from multiple data sources, aggregates, and displays it in a map form.

Data collection is done asynchronously via HTTP requests—when it is possible to keep it simple—or using a headless browser when the application needs JavaScript to load information. The application shows up as challenging due to the diverse nature of the data from different places. Also, conciliating information from various sources requires some effort.

The server-side rendering was used on the front end to index the application by search engines.