Valeriy Katkov

It was a complex, mobile-friendly Angular web app that contains a lot of features and uses some natural language processing (NLP) techniques like syntax parsing and force alignment. I was the only developer of the project.

* I've prototyped and implemented a complex responsive mobile-friendly UI based on Angular Material library and Angular CDK.
* Most of the app components use OnPush change detection and intensively uses the RxJs library. As a result, even the most complex app components work fluently on mobile devices.
* I've implemented a custom NgXs like store solution which is simple to use, completely strong typed and doesn't force you to write boilerplate code.
* Researched and tried several NLP libraries to find the ones which better fit the project requirements. Based on the libraries I've created a Node.js express server wrapped in a Docker container.
* The main part of the app logic is covered by Jasmine unit tests which made the project maintenance much easier.

It was a full-featured VK chat application that my friends and I developed for one of the biggest software development contests on the Russian internet organized by Samsung. I played a key role in the development process. The app took the 1st $45,000 prize. This winning resulted in an offer from Samsung to develop a full-featured mobile app for VK social network for the Tizen platform.

“…There was no doubt about the winners. The jury of the contest noted excellent quality, functionality, stability, and usability of the messaging app…”

* As a Tizen native mobile application it was based on web technologies: JavaScript, HTML, CSS
* All the app domain model was cached in an extremely optimized SQLite database

The official application of the social network VK* for Tizen mobile platform developed for Samsung. The app includes all the features available on the main website: a fully-featured messenger, friend list management, a newsfeed, photo and video galleries, an audio player, playlist management, and more. I played a key role in the development process.

* VK is the most popular social network and the second most visited site on the Russian internet, the 13th most visited site in the world.
* As a Tizen native mobile application it was based on web technologies: JavaScript, HTML, CSS

The application was developed by me for one of the largest software development contests in Russia organized by the largest local social network VK. The app took the second $15,000 prize.

Such a contest required not algorithm knowledge like usual programmer competitions but strong software architecture experience. It was a six-week-long contest and it was a complex app. In this short time frame, there was no room for a mistake. To develop an award-winning app you needed years of software architecture experience.

* There were hundreds of participants
* The app intensively used REST, long-polling and "push" to communicate with the back end
* Domain model was cached in an extremely optimized SQLite database to provide the best user experience
* Model layer heavily used multithreading
* UI was optimized to be fluent

The app displays several interactive charts and was developed for an official Telegram coding competition. The competition requirements were perfect design implementation, UI and animations performance, mobile devices support. Only plain JavaScript was allowed, and the app shouldn't use any third-party libraries. My implementation is based on Canvas 2D and took 4th prize in the contest.

SafeChats is an ultra-private messenger with world-class security. Superior implementation of end-to-end encryption secures the entire range of communications: voice calls, instant messages, and file transfers, regardless of the type and size limits. All transmitted data is kept on devices only. The app intensively uses SQLite DB, Android NDK, Amazon AWS cloud services, OTR encryption, and SMP identity verification to provide end-to-end encrypted VoIP.

Flying Bob is a fast-paced tap arcade game with amazing physics-based gameplay. I had a key role in the whole development process and implemented many of the game modules, including gameplay, physics, graphics, and UI.