A GPS tracker service site using Node.js, MongoDB, AngularJS, Leaflet.js, and Bootstrap. As the main developer, I built both the front-end and back-end for the whole site, while my client worked on the tracker protocol and GPS data processing. The main challenges were:
1) solving AngularJS SEO problems
2) finding a way to dynamically scale a tracker's sampling points while the map's zoom changes.

A project time tracking web app developed using AngularJS and Firebase. This is one of the most challenging front-end projects I've ever worked on. My client was a distinguished designer and emphasized UI details. I helped him to implement a very customized and UI-friendly time calendar. It looks gorgeous.

A soccer video site built using Sails.js, MongoDB, and AngularJS. I was the lead developer in the team. I participated in both front-end and back-end development. On theh front-end I worked on general reusable page sections, UI effects, AngularJS SEO, and unit testing. On the back-end, I worked on soccer data ingestion, public API definition and implementation, app deployment, and CDN caching for the API.