Alexey Karasev, Developer in Moscow, Russia
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Alexey Karasev

Verified Expert  in Engineering

Functional Programming Developer

Location
Moscow, Russia
Toptal Member Since
June 26, 2017

Alexey is proficient or more so in at least ten programming languages. He's obsessed with studying different approaches and loves comparing the best ones because he wants to start his own software company one day. During his software career, Alexey was shocked about how many man hours go into bug-fixing and refactoring. Thus he uses best approaches from functional programming and OOP to avoid bugs focus on what really matters—feature delivery.

ReactRubyRedisPostgreSQLRuby on Rails (RoR)ReduxScalaAndroidDockeriOSSwiftHttp4sJavaAngularJSObjective-C

Availability

Part-time

Preferred Environment

Git, Visual Studio Code (VS Code), Docker, MacOS

The most amazing...

...thing I've created is a full featured e-commerce system backed up by custom payments system including crypto and fiat transactions

Work Experience

CTO

2017 - 2019
Storiqa
  • Created an eCommerce system from scratch using microservices architecture.
  • Built a payments system with cryptocurrency and fiat systems.
  • Created an online testing platform for new hires.
Technologies: React, Ruby, Rust

Senior Full-stack Developer

2016 - 2018
Friends and Guests
  • Aided in the deployment of the product to beta release as a front-end (React) and back-end (Ruby on Rails) developer.
  • Led several React, Angular, and Ruby on Rails consulting projects, namely: Egghead.io, Procore.com, Everwise.com, and more.
  • Developed and led a team for a mobile app (fashion) in React Native.
  • Created a web data scraper in Rust.
Technologies: Ruby on Rails (RoR), Ruby, React

Full-stack Developer

2017 - 2017
Subspace
  • Created a new programming language parser in Scala.
  • Built a live D3.js visualization of class diagram, sequence diagram, and connectivity.
  • Updated a back-end that implemented a Git system (analog of GitHub).
Technologies: React, Scala

Microservices Developer

2017 - 2017
Orpiva Ltd
  • Developed a stable service for a URL shortening service, which is used internally for user convenience and tracking behavioral metrics.
  • Stabilized an existing Elasticsearch service (i.e., for gracefully handling network partitions of used microservices).
Technologies: Scala

Senior Mobile Developer

2016 - 2017
Secret Lab
  • Led a team of two programmers in an iOS app project for the major bank.
  • Developed an Android app for parents where they can view student marks and school schedules.
Technologies: Android, Objective-C, Swift, iOS

Full-stack Developer

2015 - 2016
Roi.rs
  • Sped-up a Ruby on Rails server response time 5-fold.
  • Created a Go server and deployed a Hadoop cluster for a user behavior tracking system.
  • Assisted in the roll-out a new front-end (AngularJS).
Technologies: Hadoop, Go, Ruby on Rails (RoR), Ruby, AngularJS

Storiqa

The project successfully raised approximately US$25 million in ICO.

My goal as a CTO was to hire and lead a team to build two big projects from scratch: an eCommerce platform and a cryptocurrency payments system.

Technologies: Rust, Ruby, React, PostgreSQL, RabbitMQ

Everwise

This is a startup focused on SaaS for talent development. The core task for me and my team was to migrate a huge existing codebase from Angular to React. We successfully completed this task and removed each and every Angular line of code, while maintaining existing features and adding new features with React.

Technologies: React, Angular, Ruby on Rails

Egghead.io

http://egghead.io
This is a massive open online course (MOOC) that's mainly focused on JavaScript. I'm helping them migrate from Angular to React and building version 2 of the application.

Technologies: Angular, React, Redux, Rails

Diary

This is an Android app for tracking the schedules and the grades of school children. I developed this app from scratch.

Demo: https://youtu.be/NyLdNLhAKmU

Friends and Guests: Connecting Hosts and Guests™

Friends and Guests is a niche competitor of Airbnb. For their project, I worked as a full-stack programmer—mainly focused on the development of new features

Technologies: Ruby on Rails, React, PostgreSQL

Wallet

This is a startup project from the number one Russian bank for storing sensitive document information (IDs, discount cards, bank cards, and more). I was a lead developer on this project.

Demo: https://youtu.be/LHq8e83A4pA

Spylight

https://youtu.be/7txNqxC__Ig
This is a mobile fashion app for browsing different looks for celebrities. I was a lead developer on this project.

Procore.com

http://procore.com
This is a unicorn startup that provides a SaaS for the construction industry. I helped the Procore team to add React components for a module that draws up the floor plans in the app.

Technologies: React, Redux, Rails.

Madrone Software & Analytics, Inc.

This is a startup that offers SaaS for hedge fund managers. I was responsible for implementing the new features in the front-end and back-end.

Technologies: React, Flux, Rails

DBEncoder.scala

This type-safe encoder and decoder from case classes lists tuples (the field name and value). For every possible case class, you get a one-line decode and encode functionality that is entirely type-safe, thus eliminating a lot of boilerplates when you want to save a case class entity to a key-value store or read from it.
Image of Option/Maybe, Either, and Future Monads in JavaScript, Python, Ruby, Swift, and Scala publication
Publication

Option/Maybe, Either, and Future Monads in JavaScript, Python, Ruby, Swift, and Scala

https://www.toptal.com/javascript/option-maybe-either-future-monads-js

Languages

JavaScript, Scala, Swift, Ruby, Java, Objective-C, Go, Rust

Frameworks

Redux, Ruby on Rails (RoR), AngularJS, Play, Hadoop

Libraries/APIs

React, Http4s

Tools

Construction Audit Tracking System (CATS), Amazon Elastic Container Service (Amazon ECS), Git

Platforms

Android, Docker, iOS, MacOS, Visual Studio Code (VS Code)

Storage

Redis, PostgreSQL, MongoDB, Cassandra

2008 - 2011

Level III Charterholder in Finance

CFA Institute - USA

2006 - 2008

Master's Degree in Economics

New Economic School - Moscow, Russia

2002 - 2007

Specialist Degree in Computer Science

Moscow State University - Moscow, Russia

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