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Dmitry Zenovich

Dmitry Zenovich

Moscow, Russia
Member since October 4, 2015
Dmitry has more than fifteen years of​ working experience and over seven years of leadership experience. His proven track record includes contributing to the success of industry leaders such as Mail.Ru Group, RosBusinessConsulting, and Begun.Ru.
Dmitry is now available for hire
  • NUVI (via Toptal)
    Golang, Ruby, Rails, RabbitMQ, Redis, PostgreSQL, MongoDB, AirBrake, StatsD...
    Ruby on Rails, PostgreSQL, Redis, RSpec, GitLab, JIRA
  • Mail.Ru Group
    Python, C, Java, PyTest, Nose, Linux, Xen, Convirt, Selenium WebDriver, Chef
  • Web Development, 15 years
  • Software Development, 15 years
  • C, 12 years
  • PHP, 10 years
  • JavaScript, 7 years
  • Technical Project Management, 7 years
  • C++, 4 years
  • Ruby, 3 years
Moscow, Russia
Preferred Environment
Mac OS X, Linux, VS Code, Vim, Sublime, Git
The most amazing...
...things I've coded are sound/music analysis, machine learning/data mining, interpreters, visual programming tools, test automation frameworks, and a web CMS.
  • Senior Engineer
    2016 - 2017
    NUVI (via Toptal)
    • Implemented most of the data-collecting logic and a big part of data conversion and data unification for NUVI's social media site. Involved in the development of a data-filtering microservice. Helped create statistical reports and fixed some WebUI-related issues. Mentored juniors and interviewed candidates.
    • Designed and implemented a microservice (Golang) for NUVI's social media site that got near-real-time activities directly from social networks and other data providers through their APIs according to users’ monitors and pushed data onto RabbitMQ and Redis with duplicate prevention. Implemented interactions with Instagram, Google+, YouTube, LexisNexis, Reddit, and VK, and helped with Pinterest and StackOverflow, mostly reimplementing the logic related to Facebook.
    • Implemented reliable and disconnection-tolerant RabbitMQ subscriptions and publishing for all the company’s Golang applications. Eliminated a very harmful and hard-to-catch issue in streadway/amqp.
    • Developed a microservice for getting real-time data from social networks and other data providers and pushing them onto RabbitMQ.
    • Designed and implemented a microservice for getting Twitter historical data through the Gnip APIs and pushing them to RabbitMQ & Redis. Refactored the microservice so that it could become a universal solution for getting historical data from all the social networks.
    • Implemented reverse geocoding for getting ISO-3166-2 region code by geocoordinates in just one fast SQL query.
    • Designed and implemented a microservice that received near-real-time activities through DataSift API according to users’ monitors and pushed them onto RabbitMQ and Redis in internal data formats.
    • Developed a library for URL normalization and concurrent resolution of redirects.
    • Made a library for conversion between usernames and user IDs for Instagram and Facebook.
    • Added support for LexisNexis and VK to a microservice, implemented URLs normalizing with redirect resolution and universal conversion of regions/countries names and codes into ISO-3166-1/2 along with reverse geocoding.
    • Implemented a social network users matcher, URL matcher, and HTML stripping for text search; added the ability to debug the microservice locally using copies of real data streams; and improved publishing to RabbitMQ and Redis, along with other fixes and refactoring.
    • Designed and implemented a microservice to replay historical data from the company’s database to RabbitMQ and to convert data between formats. The microservice had a Rest API and a CLI for creating jobs and for querying their statuses. The jobs and their sub-jobs were being processed in parallel.
    • Implemented a microservice that read activities of various social networks from RabbitMQ and stored them into MongoDB and PostgreSQL. The microservice had a REST API and a CLI for getting data from the DB.
    • Designed and developed a web application for collecting visitors’ social networks access tokens through OAuth APIs.
    • Created a library for working with monitor data that were stored in PostgreSQL and updated in real-time via RabbitMQ messages. The library was employed in several microservices.
    • Added some statistical reports to the company’s data warehouse application.
    • Implemented a simple client library for Semantria API.
    • Translated a number of data structure definitions from C# into Ruby MongoID documents with typed arrays and hashes—polymorphic nested structures. Implemented validation for them.
    • Fixed some issues in the UI and reworked the user session store.
    • Authored an initial version of ActiveRecord adapter for CitusDB.
    Technologies: Golang, Ruby, Rails, RabbitMQ, Redis, PostgreSQL, MongoDB, AirBrake, StatsD, Heroku, CircleCI, Deis
  • CTO
    2014 - 2015
    • Built a software development team (Ruby on Rails) which outclassed all previous ones in its effectiveness. My team, with my direct participation, released v2.0 and, reworked and recovered eCommerce features, developed new features of billing, introduced a Rails engine based on code of to make it a framework for all projects, and moved and onto it.
    • Established regular Scrum meetings and iteration plannings, organized a new task-tracking system and a documentation system, and established code-flow rules.
    • Organized, in collaboration with team members, a continuous integration system, fixed unit tests, and introduced new Selenium tests.
    • Found a system operator who joined the team and took all the tasks of a remote maintenance team. The code repositories were transferred onto the company's servers out from GitHub. Regular backups were tuned up. A monitoring system was introduced. A process for doing regular payments for hosting and other services was tuned up too.
    Technologies: Ruby on Rails, PostgreSQL, Redis, RSpec, GitLab, JIRA
  • Head of Software Quality Assurance
    2011 - 2013
    Mail.Ru Group
    • Developed automated testing that is interesting for people working on it (super-team, infrastructure, testing, test automation, continuous integration, requirements management, interaction with product owners, project managers, developers, operators, HR team, and PR team).
    • Introduced the first stable multithreaded Selenium WebDriver service available on the company level, which now is being used in testing of many of company's products.
    • Directed and coordinated a team to build a large set of automated tests from scratch on Python for daemons written on C, for the main module of advertisement feeds, a company-wide common template engine, and main parts of web front-end of
    • Developed a testing infrastructure available on the company level (Xen virtualization with Convinture Convirt Open Source web-interface, configuration management with Opscode Chef, and continuous integration with Jenkins). This infrastructure became a home for continuous integration systems of different projects for our company.
    • Developed and applied a tool for database change management based on migrations.
    Technologies: Python, C, Java, PyTest, Nose, Linux, Xen, Convirt, Selenium WebDriver, Chef
  • Head of Software Development
    2011 - 2011
    Oversun Scalaxy
    • Built new features (confirmation of registration via mobile text messages, and the feature of "promised payment"); fixed lots of bugs; accelerated the web interface through optimizations of the JavaScript code; and released the first stable version of the cloud (1.00).
    • Served as head of the software development direction, head of the Ruby development department, head of the Testing department, and one of the main Ruby on Rails and JavaScript developers.
    • Trained colleagues, assisted the tech-support team in solving technical issues, helped the accounting department with reports creating, and participated in meetings devoted to the development of the product.
    Technologies: Ruby on Rails, JavaScript, jQuery, RSpec, Xen
  • Head of QA
    2010 - 2011
    Oversun Scalaxy
    • Built the testing process in conditions of an acute shortage of resources.
    • Communicated with software developers, operators, and technical support team, informing programmers about user complaints and speeding up bug fixing. Participated in the discussion on technical architecture of new project tasks.
    • Tested the company's software using automated, semi-automated, and manual approaches.
    • Regularly planned testing and development of auto-tests, verified both functional and load requirements, and composed tasks for defect elimination and monitoring of system development.
    • Trained colleagues to write Selenium tests with Cucumber.
    • Re-established browser Selenium tests (Cucumber, Ruby, Selenium-RC) and added them into the continuous integration system. Achieved parallel running of Selenium tests in various browsers after patching the Selenium-RC source on Java.
    Technologies: Ruby, RSpec, C, Linux, Selenium-RC, Cucumber, Java
  • Head of Software Quality Assurance Department
    2007 - 2010
    • Founded the quality assurance department of a Russian contextual auction-based advertising internet service, hired employees, and managed them. Planned teamwork, created the testing framework and environment, and communicated with software developers, operators, project managers, and business owners.
    • Created and designed core components of a system for automated testing of the company's web interfaces and scripts, daemons, JS-blocks, ActionScript VPAID library, etc.
    • Introduced a continuous integration system based on phpUnderControl. Helped introduce the company's coding standards; separated stable and current code using branches in the SVN repository. Coordinated product deployment.
    • Developed a tool that provides a way to write formal bug reports into the Trac.
    • Trained colleagues in software testing and the fine points of development for high-load systems, database optimization, and test-driven development.
    • Originated and carried out the entire software lifecycle for a feature that brings the company a few thousand dollars a day.
    • Created a PHP extension for internal use in the company and made a significant number of corrections of the PHP-extension runkit.
    Technologies: PHP, C, ActionScript, Linux, PHPUnit, Runkit, Zend Framework, Selenium-RC, Trac, VPAID
  • Lead Developer
    2006 - 2007
    RosBusinessConsulting Media World (
    • Improved the main web-mail features (representation, replying, messages formation, etc.) to support a variety of MIME combinations and encodings (this work was based on patching, optimizing and reintegrating the huge Horde Framework).
    • Designed database schemas to improve the efficiency and scalability of the system.
    • Sped up the web interface by rewriting code, modifying database structure and SQL queries, and caching data (on a file system or Memcached). Improved scalability of the web front-end (moved session data out from the local file system into the database).
    • Eliminated a huge number of possibilities for XSS injections and SQL injections in the project.
    • Designed and developed an internet-links catalog, added support for OpenID and RSS into the project, and authored a client-side part for a prototype of an online instant messenger on JavaScript and PHP.
    Technologies: PHP, JavaScript, MySQL, MIME, Horde Framework, Web Security
  • Web Developer
    2003 - 2006
    • Oversaw web development for the company.
    • Authored a new web CMS.
    • Created more than 40 websites with administrative interfaces (including a large e-shop) basing on the CMS.
    • Designed database models (MySQL) and regularly patched HTML templates and CSS stylesheets.
    • Operated Linux and FreeBSD, installed and configured Apache, PHP, MySQL, vsFTPd, Samba, and VPN (pptpd).
    Technologies: PHP, JavaScript, MySQL, HTML, CSS
  • Programmer
    2003 - 2003
    • Coded regular expressions.
    • Wrote format converters of price lists on XSLT.
    • Contributed to technical analytics.
    • Wrote documentation on the XML format.
    Technologies: Regular expressions, XSLT
  • Web Developer
    2001 - 2002
    • Automated the portal and added 16 new sections (including forum and search) into it.
    • Created six new sites from scratch.
    • Created a universal administrative interface for all sites in a very short time.
    Technologies: PHP, PHPlib, MySQL, XSLT
  • PHP Runkit Extension (Development)

    The runkit extension is written in plain C and provides means to modify constants, user-defined functions, and user-defined classes. It also provides for custom superglobal variables and embeddable sub-interpreters via sandboxing.

    I'm maintaining it on GitHub since 2009, and now I'm officially the project's leader.

  • Languages
    C, Regex, PHP, Ruby, Go, Python, JavaScript, C++, HTML, SQL, Assembler x86, XPath, XHTML, CSS, Java, AWK, XML, YAML, XSLT, AS3, XML/XSLT, Sed, Curl Language, C#, ActionScript, Sass
  • Frameworks
    Selenium, PHPUnit, Ruby on Rails (RoR), Horde, Qt, Zend Framework, Django, Capybara, PEAR, JNI, JUnit, QUnit, Slim
  • Libraries/APIs
    Selenium Grid, Selenium WebDriver, CarrierWave, Standard Template Library (STL), Mongoid, jQuery, Sidekiq, Devise, REST API, DataSift API, Sockets, Gnip API, Matplotlib, SAX, NumPy, SciPy, libvirt, jMock, AdWords API, GeoIP, Microsoft Foundation Class Library (MFC), FFTW, Protobuf, Google AdWords, AMQP
  • Tools
    xUnit, Jenkins, RSpec, Capistrano, Trac, GitLab, JIRA, Visual Studio, Shell, Sublime Text, Vim Text Editor, Git, Nginx, Xdebug, Subversion (SVN), Chef, Cucumber, GDB, Valgrind, GitHub, phpMyAdmin, Redmine, Firebug, Vagrant, Pytest, FishEye, MATLAB, Trello, Microsoft Excel, Zabbix, rbenv, Slack, Open Office, php-fpm, JMeter, Apache JMeter, VirtualBox, Microsoft Project, VPN, Qt Creator, RVM, Microsoft Visual C++, PuTTY
  • Paradigms
    Test-driven Development (TDD), Testing, Model View Controller (MVC), Change Management, Behavior-driven Development (BDD), Object-oriented Programming (OOP), Continuous Integration (CI), XP, REST, Continuous Deployment, Concurrent Programming, Scrum, DRY
  • Platforms
    LAMP, Linux, Unix, Ubuntu, BREW, Firefox, Xen, Windows, Win32
  • Other
    Software Design, Web Development, Source Control Management, XSS, Data Structures, Algorithms, QA Test Plan Management, Regular Expressions, Software QA, Quality Assurance (QA), AJAX, Software Development, PHPDoc, Agile Software Testing, WebDAV, Technical Project Management, Technology Strategy & Architecture, HTTP, Workflow Modeling, Project Management, Parsers, Math, Debugging, OAuth, CGI, DHTML, DOM, UDP, SOAP, Outlook, XML RPC, Doxygen, Optimization Algorithms, Digital Signal Processing
  • Storage
    JSON, MySQL, PostgreSQL, MySQLi, InnoDB, MyISAM, LVM, VSFTPD, MongoDB, Redis, Memcached
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