Sergey Bershadsky

The task was in a short cycle to create a working prototype of a Yelp-like application with per-person granularity. I was using the Google Cloud Engine. Initial provisioning was done with Ansible. React Native App both for iOS and Android was developed. Mobile app features included geolocation service, authentication and resource management. Docker deployment on GKE with MySQL Cloud as data storage. The back-end was done with Python (Django with DRF). There was one mobile application that interacts with the back-end through a REST API built with React Native. The facility manager's dashboard was built with Django using a Material Design look. The goal was achieved.

Developed React Native-based authorization components for a UMIAS project. The authentication service is built on top of JWT and the back-end is built with Django/python. The most challenging part was creating encrypted user storage with a multikey recovery feature.

I created the back-end for this social network. I also implemented features for fast and extendable messaging, content sharing, and file uploading with a converter to suitable formats. It integrates the OAuth API for third-party site functionality for creating accounts using social networks. It also features fast CMC registration and a powerful but simple anti-spam integral scoring system. For storage, I used MySQL, but for complex selections, I used caching and indexing through Memcached, Xapian, or custom-written indexes. Everything is built on top of Django with i10n in mind.

I wrote the back-end for this game as a fully REST application. Every action in the game was declared in an API with MongoDB as the storage engine. In game, the user can farm plants, trees, and animals, take quests, fish, and battle with other users using plants and fruits. Also, every user can organize groups among different users and achieve game goals together. The most challenging thing for me was to create a system establishing the game balance in the most simplified way. I used Excel sheets to load code on startup and act as a database, allowing the game designer to simply change parameters in the sheet to establish a new balance.

I created the back-end and front-end for a shopping cart system consisting of 13 fully functional sites (wholesale and retail). I wrote a Django application with generic storage for the products, product attributes, and categories. I implemented an SSO feature to stay logged in on every site. I also developed a REST service API that exchanges product info and orders with the accounting system in a bi-directional way. I used MongoDB as a caching system for fast product data access.

A simple experimental library for making deep and complex MongoDB select and updating queries with one line of Python. I created it using only Python expressions. This library implements 100% of python magic showing my deep knowledge in language.

I contributed to about 40 TYPO3 projects between 2005 and 2014 along with hundreds of custom extensions, involved in the software development lifecycle from wireframes through to deployment. The most challenging were shop-like systems like the one linked here.