Vladyslav Millier

Vladyslav Millier

Larnaca, Cyprus
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Vladyslav Millier

Vladyslav Millier

Larnaca, Cyprus
Member since November 11, 2013
Vlad is self-motivated, versatile, positive software developer with work experience in many programming languages and frameworks. He is interested in architecting, building, and working with scalable systems and applications for complex problems. He is currently perfecting his knowledge of Scala and machine learning.
Vladyslav is now available for hire
Portfolio
Experience
  • JavaScript, 6 years
  • Node.js, 4 years
  • CentOS, 4 years
  • AngularJS, 3 years
  • Express, 2 years
  • Scala, 2 years
  • Play Framework, 2 years
Larnaca, Cyprus
Availability
Part-time
Preferred Environment
OSX, IntelliJ *, Vim, Git
The most amazing...
...thing I've coded is a neural network to recognize handwritten text.
Employment
  • Software Engineer
    2PVentures
    2015 - PRESENT
    • Deployed resilient ElasticSearch clusters to AWS Beanstalk.
    • Designed and created cross-platform analytics tracking script similar to Google Analytics. Built large set of tests and configured Webdriver.io to run those tests in variety of different environments.
    • Wrote an Async event pipeline which received data from the client-side tracking script, filtered and then enriched it with additional data, and finally saved it in BigQuery.
    • Wrote a reports generator API for BigQuery. Created a lot of complex analytical queries for BQ.
    • Built an analytics dashboard for C-level executives.
    • Implemented a service to create and renew membership subscriptions.
    • Managed a huge data set of existing tracking data. Had to export, transform, filter, and enrich it with other data before finally migrating it to BQ. Had to write dozens of data validation queries.
    • Managed continuous implementation and deployment via Jenkins.
    Technologies: GAE, Google BigQuery, ElasticSearch, AWS, RedShift, Node.js, AngularJS, ReactJS
  • Web Developer
    Fubo.tv (via Toptal)
    2015 - 2015
    • Found and fixed memory leaks in Node.js applications.
    • Rebuilt the current API to allow hundreds of thousands of requests to be processed.
    • Improved database schema and indexing.
    • Maintained CD and server.
    • Made performance improvements.
    Technologies: Node.js, MongoDB
  • Web Developer
    MyTravelCharter, LLC (via Toptal)
    2015 - 2015
    • Implemented a variety of UI components and APIs.
    • Designed and deployed a booking system with transactions support for MongoDB.
    • Made performance improvements and updates.
    • Created an API to make complex reports simple.
    • Maintained server deployments, CD, and firewalls.
    Technologies: Node.js, AngularJS, MongoDB, PostgreSQL
  • Senior Scala Developer
    Meta Labs, Inc.
    2012 - 2015
    • Developed several simple eCommerce stores using Magento.
    • Created a handwriting recognition neural network.
    • Hacked a Ukrainian bank during a bug bounty program.
    • Improved a marketing and transaction email platform actively, raising it to the standards comparable to Mandrill.
    • Implemented custom integrations with Chase PaymentTech and First Data Compass.
    • Developed software to read mag stripe data using square readers.
    Technologies: Scala, Java, Node.js, MATLAB, Machine Learning
  • Software Developer
    HyperMail, Inc.
    2012 - 2013
    • Developed a platform to track and submit marketing emails.
    • Designed and deployed a successful payment gateway for high risk businesses in India.
    • Created a resilient Cassandra cluster to hold and analyze a billion customer contact records.
    • Created a custom merchant risk rate index based on a short term transactions record log and publicly available information.
    • Built a data exchange platform.
    • Created an affiliate tracking system using PHP and PostgreSQL. Created a coupon management system, and integrated with affiliation.
    Technologies: PHP, Node.js, Scala, Cassandra, Redis
  • PHP Developer
    Carousel Checks
    2011 - 2012
    • Supported an eCommerce store.
    • Developed a blogging engine.
    • Implemented an integration with Google Wallet.
    • Hunted down numerous security vulnerabilities.
    • Managed Magento migrations.
    Technologies: PHP, MySQL, CentOS, JavaScript, Magento
Experience
  • Payment Gateway (Development)

    Payment Gateway is a software providing single API for payment processing via multiple merchant backends. Has integrations with Chase PaymentTech, FirstData Compass, FirstData Nova and various offshore providers. This software includes different algorithms and techniques to spot a fraudulent activity.

  • Debugging Memory Leaks in Node.js Applications (Publication)
    Memory leaks in long running Node.js applications are like ticking time bombs that, if left unchecked in production environments, can result in devastating outcomes. These bugs are often considered to be hard to find. However, with the right tools and a strategic approach, memory leaks can not only be solved but also avoided in the future. In this article, Toptal engineer Vladyslav Millier gives us insight into what memory leaks are, how some sophisticated debugging tools can be used to find memory leaks, and how to plug them once and for all.
  • Vladyslav is a mentor in the Toptal Global Mentor’s Program. This program is a partnership between Toptal and General Assembly to provide high quality mentorship for students from minority and low income backgrounds who are looking to begin their careers as professional software engineers. Vladyslav shows commitment to diversity in tech by mentoring a General Assembly student every week for a year, covering everything from coding tips and tricks to advice on making it in the industry.
Skills
  • Languages
    JavaScript, Scala, PHP, SQL, Ruby, Python, C++, MATLAB, Octave
  • Frameworks
    React.js, Flux, Redux, Ruby on Rails, AngularJS, Akka 2.0, Express, Zend Framework 2, Play Framework
  • Paradigms
    Cross-browser JavaScript, Parallel programming, Agile Software Development
  • Misc
    RESTful, Gulp
  • Libraries/APIs
    Node.js, Facebook API, Stripe, Highcharts, spray, jQuery, VK API
  • Tools
    IntelliJ IDEA, Webpack, Terminal, Vim, Grunt, Tortoise Git, Adobe Photoshop
  • Platforms
    Mac OS, Ubuntu, CentOS, Linux
  • Storage
    Cassandra, CouchDB, MongoDB, InnoDB, PostgreSQL, MariaDB, Redis, MySQL, Couchbase
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