Yulij Andreevich Lesov, Software Developer in Kowloon Bay, Hong Kong
Yulij Andreevich Lesov

Software Developer in Kowloon Bay, Hong Kong

Member since July 13, 2016
Yulij is a fast-learning polyglot developer with a keen business sense. He has distinguished himself with each of his clients by resonating with the business needs behind each project: being able to make judgments not only for the best technical solution, but also the one that makes the most business sense.
Yulij is now available for hire


  • SafeT
    Ruby, Ember.js, TCP, HTTP, Networking
  • SafeT
    Ruby, TCP, HTTP, Networking, Knockout.js, C#
  • FreshUp
    Rails, Ember.js, Node.js, Express.js, Socket.IO, RabbitMQ, Cassandra, Redis...



Kowloon Bay, Hong Kong



Preferred Environment

Linux, Git, Vim

The most amazing...

...thing I've built--from firmware, custom protocol transfer, and server to web/mobile front-end--is a system for vending machine monitoring and data analytics.


  • Developer

    2017 - 2019
    • Maintained a legacy product in Ember.js.
    • Developed an administration panel fronting product.
    • Consulted on network security.
    • Created a testing framework bridging between developers and QA team.
    • Fielded end-user calls as technical support.
    Technologies: Ruby, Ember.js, TCP, HTTP, Networking
  • Developer

    2016 - 2016
    • Engineered raw network protocols.
    • Created an enterprise network security proxy product.
    • Developed horizontal scaling with performance tuning.
    • Wrote a domain-specific language for the user development kit.
    Technologies: Ruby, TCP, HTTP, Networking, Knockout.js, C#
  • Technical Lead

    2014 - 2016
    • Integrated contactless payment in vending machines.
    • Created data analytics with statistical modeling.
    • Built an embedded C++ system.
    • Developed a Rails/Ember web front end.
    • Programmed a Node.js general-purpose processing server.
    • Implemented a corporate ERP.
    • Facilitated Ansible/Docker mass deployment.
    Technologies: Rails, Ember.js, Node.js, Express.js, Socket.IO, RabbitMQ, Cassandra, Redis, C++, SH, Ansible, Docker
  • Developer

    2014 - 2016
    Hong Kong Jockey Club
    • Built an embedded system for payment gateway integration in vending machines.
    • Implemented core logic in Node.
    • Utilized C++ for accessing machine protocol.
    • Facilitated Ansible/Docker mass deployment.
    Technologies: Node.js, Express.js, AngularJS, Bootstrap, Rails, PostgreSQL, REST, Socket.IO, Ansible, Docker
  • Developer

    2014 - 2016
    Hong Kong Polytechnic University
    • Built a university smartcard access control system.
    • Created core logic in Node.
    • Developed the driver layer in C#.
    • Deployed in Windows with networking security.
    Technologies: Node.js, Express.js, CoffeeScript, SQLite, Socket.IO, C#, Bash
  • Senior Developer

    2014 - 2014
    • Built a subscription-based e-course platform with a corporate website.
    • Created the core platform in Node/Angular.
    • Implemented Solr indexed materials search.
    • Integrated a legacy system.
    Technologies: Node.js, Express, AngularJS, Python, MySQL, REST, Solr, Redis, Memcache, AWS
  • Senior Developer

    2013 - 2014
    • Created a building management enterprise platform.
    • Implemented a Node/Angular app.
    • Balanced feature requests, code stability, and project velocity, transitioning from ex-PM.
    Technologies: Node.js, Express.js, AngularJS, Python, PostgreSQL, Redis, AWS


  • Languages

    Sass, ECMAScript (ES6), CoffeeScript, CSS3, Emblem, Pug, Haml, Sh, Bash, CSS, HTML, Java, PHP, HTML5, JavaScript, Ruby, Python, C, C++, Perl, Less, C#, Batch
  • Frameworks

    Bootstrap, AngularJS, Ember.js, Slim, Express.js, Ruby on Rails (RoR), Compass, ZURB Foundation, Zend Framework, Twig, Sails.js, Laravel
  • Libraries/APIs

    SockJS, Socket.IO, Handlebars, Node.js, jQuery, Bookshelf.js, GatsbyJS, React, Mustache, Sidekiq, RxJava, Butterknife
  • Tools

    RabbitMQ, Zsh, Git, NPM, Cluster, Bundler, Nginx, Ansible, Solr, Capistrano, Grunt.js, Google Kubernetes Engine (GKE), Subversion (SVN), Gradle, Composer
  • Paradigms

    Behavior-driven Development (BDD), REST, Test-driven Development (TDD)
  • Platforms

    Docker, Kubernetes, Meteor, Magento, osCommerce
  • Storage

    PostgreSQL, Cassandra, SQLite, MySQL, Elasticsearch, MongoDB, Redis, Memcached
  • Other

    WebSockets, HTTP, TCP, HAProxy, Network Protocols


  • Bachelor of Business Administration degree in Business Administration
    2009 - 2012
    The Chinese University of Hong Kong - Hong Kong

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