Vitaly is available for hire
Hire VitalyVitaly Fomichev
Verified Expert in Engineering
Software Developer
Bishkek, Kyrgyzstan
Toptal member since March 29, 2023
Bio
Vitaly is a senior web application developer with more than two decades of professional experience, working primarily with Ruby on Rails and PostgreSQL. He is comfortable working as a team lead and as an individual contributor. Vitaly loves solving technical challenges, but his main focus is to understand business needs and provide significant value for modern business as a whole. He believes the most amazing thing about modern technologies is how they change our world.
Portfolio
self employed
Python, WebSockets, Pandas, Minimum Viable Product (MVP), API Integration...
CirrusLabs
Ruby on Rails (RoR), Ruby, Sidekiq, JavaScript, Stimulus, TypeScript...
Toptal
Ruby on Rails (RoR), PostgreSQL, Redis, Apache Kafka, GraphQL, Database Design...
Experience
- JavaScript - 20 years
- Ruby on Rails (RoR) - 17 years
- REST - 15 years
- PostgreSQL - 10 years
- Code Review - 3 years
- TypeScript - 3 years
- GraphQL - 1 year
- React - 1 year
Work Experience
Quantitative Researcher & Algorithmic Trading Engineer
2024 - PRESENT
self employed
- Built Python data pipelines and bots to ingest, normalize, and QA historical spot and options order book, trades, and implied volatility data from Binance, storing time-series JSON, performing data quality checks, and creating reproducible snapshots.
- Implemented a real-time options trading bot subscribing to Binance WebSocket streams for options and underlyings; engineered features and signal generation, position sizing calculation logic.
- Implemented a "paper trade" application running on the Binance Websocket API connection to prove trading ideas in a real-time production environment.
Technologies: Python, WebSockets, Pandas, Minimum Viable Product (MVP), API Integration, Artificial Intelligence (AI), Algorithmic Trading, CCXT, Binance API, Trading Bots
Senior Web Application Developer
2023 - 2024
CirrusLabs
- Played a significant role in the development of Lockthreat GRC platform https://www.lockthreat.ai/, intended to serve as a compliance application for the Department of Health, Abu Dhabi (UAE).
- Imported data from CSV to a PostgreSQL database using data migration scripts and implemented form submission logic for domains and controls as an SPA in StimulusJS.
- Implemented formula calculation logic to calculate and update custom user fields using formulas similar to Excel and Google Sheets.
- Played a key role in the successful product launch, handling bug resolution, hotfixes, and rapid on-the-fly changes under tight deadlines.
Technologies: Ruby on Rails (RoR), Ruby, Sidekiq, JavaScript, Stimulus, TypeScript, Full-stack, Minimum Viable Product (MVP), Cypress, API Integration, Code Review, Automated Testing, Artificial Intelligence (AI)
Senior Back-end Engineer
2021 - 2023
Toptal
- Scoped and refined software engineering tasks in Jira. Discussed technical problems and approaches with a software architect.
- Implemented JSON event producers and consumers for two-way async communication between Toptal applications using Kafka, Karafka, and Restforce.
- Implemented back-end API queries and mutations using a GraphQL API and corresponding front-end API clients using TypeScript and React.
- Added and implemented back-end workers using Sidekiq and Redis.
- Implemented a few performance monitoring tasks in Grafana.
Technologies: Ruby on Rails (RoR), PostgreSQL, Redis, Apache Kafka, GraphQL, Database Design, Ruby, Sidekiq, REST, JSON, Docker, Docker Compose, Linux, Grafana, MacOS, Visual Studio Code (VS Code), CI/CD Pipelines, REST APIs, JavaScript, TypeScript, Full-stack, Architecture, Cypress, React, API Integration, Code Review, Automated Testing
Senior Web Application Developer
2013 - 2020
ATC Air Service
- Implemented a Ruby on Rails (RoR) app to process order status change events of parcels on their way from China to Russia. Started from a minimum viable product (MVP) and production and rapidly scaled it to process millions of events in real time.
- Implemented a consumer for postal bag data from a Hong Kong Post API using SOAP XML.
- Designed and implemented a flexible pricing solution based on the logistics route, logistics channel, service level, and period of validity.
- Created and implemented REST APIs for partner integrations, including Russian Post and the Federal Customs Service.
Technologies: SOAP, JSON, REST, XML, Ruby on Rails (RoR), PostgreSQL, Redis, Sidekiq, NGINX, Linux, Database Design, Ruby, MacOS, REST APIs, JavaScript, Full-stack, Minimum Viable Product (MVP), Architecture, API Integration, Large Data Sets, Automated Testing
Senior Web Application Developer
2005 - 2016
Self-employed
- Developed a marketplace for mobile phone unlocking codes, gathering multiple partner API integrations and providing a REST API for the resellers.
- Built an RoR back end for the Campus Movie Fest (CMF) web application.
- Created a poker game statistics application to collect the results of individual poker games.
- Developed an eCommerce marketplace similar to Etsy.
Technologies: Ruby on Rails (RoR), PostgreSQL, MySQL, Database Design, Ruby, Cucumber, Sidekiq, NGINX, XML, REST, JSON, Redis, Data Structures, Docker Compose, Docker, Linux, MacOS, PHP, REST APIs, JavaScript, Full-stack, Minimum Viable Product (MVP), API Integration, Code Review, Automated Testing
Senior Web Application Developer | Team Lead
2000 - 2005
Venere Net S.r.l.
- Migrated an internet hotel reservation engine from Allaire ColdFusion to PHP.
- Implemented SOAP XML API consumers for third-party API integrations.
- Designed and implemented a hotel review and hotel rating solution.
- Implemented a custom database query caching layer in PHP.
Technologies: PHP, Sybase, Database Design, XML, Linux, Full-stack, Minimum Viable Product (MVP)
Project History
Logistics API Service
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.
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.
REST API Solution for Unlocking.com
http://www.unlocking.comDeveloped 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.
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.
Stocks Arbitrage Trading bot
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.
• 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.
Education
1994 - 1999
Master's Degree in Computer Science
Tomsk State University of Control Systems and Radioelectronics - Tomsk, Russia
Skills
Libraries/APIs
REST APIs, Binance API, Sidekiq, Ruby on Rails API, React, Pandas, CCXT
Tools
Cucumber, Docker Compose, NGINX, Grafana
Languages
Ruby, XML, JavaScript, TypeScript, Python, GraphQL, PHP, Python 3
Frameworks
Ruby on Rails (RoR), Stimulus, Cypress
Paradigms
REST, Automated Testing, Database Design, Database Development
Storage
Redis, JSON, PostgreSQL, MySQL, Sybase
Platforms
MacOS, Linux, Visual Studio Code (VS Code), Docker, Apache Kafka
Other
Code Review, Minimum Viable Product (MVP), API Integration, Large Data Sets, Algorithmic Trading, Trading Bots, CI/CD Pipelines, Large Language Models (LLMs), Full-stack, Architecture, Software Engineering, IT Systems Engineering, Algorithms, Data Structures, SOAP, FastAPI, WebSockets, Artificial Intelligence (AI)
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