Vitaly Fomichev

Implemented an RoR application to process order status change events of parcels from China to Russia. I started from an MVP and production and rapidly scaled it to process millions of real-time events.

Here is a brief list of tasks and responsibilities:
• consuming API events using XML parser
• consuming postal bags data from Hong Kong Post API (SOAP XML)
• design and implementation of flexible pricing solution based on the logistics route, logistics channel, service level, and period of validity
• design and implementation of a custom billing solution
• design and implementation of user access groups and policies
• design and implementation of REST APIs for partner integrations, including Russian Post and Russian Customs
• producing API integration events using JSON and XML
• performance scaling and optimizations
• performance and endurance testing with a simulated load
• generating CSV and Excel reports on the back end

This applications enabled many new logistics routes from China to Russia, resulting in millions of parcels delivered much faster than before with fewer losses and better tracking of every parcel and every bag on their route from China to Russia.

This was the most prominent project of my professional career.

Developed a marketplace for Unlocking.com mobile phone unlocking codes, gathering multiple partner API integrations and providing a REST API for the resellers.

I implemented the following parts:
• Client API integrations
• REST API for reselling unlocking codes
• An admin interface to configure reselling logic and flexible pricing for each of the supported phone brands
• Error handling
• Reporting functionality

This application significantly increased eCommerce sales of unlocking phone codes on many markets, including eBay.

Starting from the simple idea for arbitrage trading, I implemented a few simple scripts in Python to prove the idea, then working in pairs with my friend, we created a full-scale trading bot with the following functionality:

• fetch and parse stocks prices from Hong Kong and China
• fetch and parse CNY/USD and HKD/USD exchange rates
• calculated predicted prices for corresponding ADR shares traded on NYSE
• submitted "long" and "short" orders to Tinkoff Investing broker thru custom REST API client
• error reporting and handling
• admin reports and management functions using ActiveAdmin gem

This bot earned thousands of USD for both of us, and it worked until February 2022, when Tinkoff broker ceased operations with ADR shares that we traded.