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Damir Zekić, Ruby Developer in Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina
Damir Zekić

Ruby Developer in Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina

Member since October 27, 2014
Damir is a full-stack web developer who has been writing web applications for eighteen years using a variety of languages and technologies, but since 2008 he has been focusing largely on Ruby and Ruby on Rails. He has a good sense for UX and is committed to every detail when implementing user interface designs with HTML, CSS, and JavaScript.
Damir is now available for hire



  • Test-driven Development (TDD), 11 years
  • JavaScript, 11 years
  • Ruby, 10 years
  • Ruby on Rails (RoR), 9 years
  • Git, 7 years
  • Agile Software Development, 7 years
  • Heroku, 4 years
  • Technical Project Management, 2 years
Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina



Preferred Environment

OS X, Tmux, Vim, Git

The most amazing...

...optimization I've made was to embed images into a cached piece of HTML to reduce CDN costs for a client who had a widget on a high-traffic website.


  • Software Engineer

    2018 - PRESENT
    • Added support for blocking international domain names.
    • Maintained an API developed with Ruby on Rails.
    • Implemented a mechanism for upgrading user accounts with codes that open new business opportunities for volume licensing.
    Technologies: Ruby on Rails, PostgreSQL, React, ES6, JavaScript
  • Software Engineer, Team Lead

    2015 - 2018
    Totpal, LLC
    • Led a remote team that worked on improving development ergonomics (improving speed and quality of tests and CI pipeline; overseeing a migration to Granite—a framework developed within the company).
    • Debugged a problem between an internal framework and Ruby language that was causing a slowdown for about 80 other developers in the team when running the application locally.
    • Migrated images stored on a local filesystem to Amazon S3 and upgraded the codebase to work with the new storage seamlessly.
    • Led a remote team that worked on new features inside a big monolithic Ruby on Rails application with Granite and a custom programming environment/language to describe business processes.
    • Maintained a billing system implemented inside a big monolithic Ruby on Rails codebase.
    • Conducted live technical interviews with candidates for Ruby engineer roles. Contributed to the content of the interview process.
    • Maintained and added new features to an API implemented with Grape on top of Ruby on Rails.
    • Launched TopTracker, a time tracking software for freelancers. Co-ordinated stress tests of the API with a QA engineer and production machine setup with an infrastructure engineer ensuring a smooth launch.
    Technologies: Ruby on Rails, PostgreSQL, React, ES6, S3, Grape, Granite
  • Developer

    2014 - 2015
    Blue River Technology (via Toptal)
    • Created a UI that allows Mechanical Turk workers to label images using point-and-click interface with HTML5 and JavaScript.
    • Developed a Broccoli plugin that allows embedding JavaScript code into the HTML template for distribution.
    • Wrote a web app that allows importing of CSV files with a drag-and-drop interface.
    • Designed and implemented an algorithm for clustering data from multiple Mechanical Turk workers.
    Technologies: JavaScript, HTML5, Mechanical Turk, Ruby on Rails
  • Contractor

    2014 - 2015
    Nehemia Consulting
    • Developed a Windows application using WPF.
    • Wrote an application combining C# and F#, using C# for user interface and F# for calculation-heavy logic.
    • Created a robust UI that allows importing from Excel and plaintext files in various formats.
    • Implemented training of MLR models with validation and prediction.
    Technologies: WPF, C#, F#
  • Lead Developer

    2013 - 2014
    Starting Point
    • Created a fashion eCommerce website with CMS implemented using Ember.js.
    • Integrated the checkout process with API for processing customer payments.
    • Integrated the application with DHL API to support drop shipping from sellers directly to customers.
    • Developed a flexible web-based tool to import data from Excel and CSV files with prediction to guess a correct file format.
    • Led a team of three developers.
    • Designed an algorithm for dynamic pricing of goods.
    Technologies: Ruby on Rails, Ember.js, JavaScript, HTML, CSS
  • Full-stack Web Developer and Co-founder

    2010 - 2013
    • Created an embeddable widget allowing preview and purchase of ebooks and audio/video materials.
    • Integrated the application with Stripe to process customer payments.
    • Maintained and refactored a large Ruby on Rails application.
    • Conducted BDD with RSpec, Mocha, and Chai.
    • Worked in a geographically distributed team.
    • Collaborated closely with a UI/UX designer to faithfully implement designs with HTML and JavaScript.
    Technologies: Ruby on Rails, JavaScript, CoffeeScript, PostgreSQL
  • Software Engineer

    2004 - 2007
    • Implemented a web application for stock trading.
    • Developed a student information system for the largest university in Bosnia and Herzegovina.
    • Created a workflow management system used by several government institutions in Bosnia and Herzegovina.
    • Conducted TDD with NUnit.
    • Wrote and maintained stored procedures.
    Technologies: PHP, Visual Basic, C#, Windows Forms, ASP.NET, MS SQL
  • Intern Web Developer

    2004 - 2005
    BH Telecom
    • Implemented a new version of an online phone book for the biggest telecom company in Bosnia and Herzegovina.
    • Created a domain-specific CMS for a gaming website with PHP.
    • Used Ajax to check the availability of user names.
    • Made a plugin for TYPO3.
    • Developed a search engine based on data stored in an Oracle database.
    Technologies: PHP, JavaScript, Oracle


  • A Toolbelt of a Seasoned Bug Hunter (Other amazing things)

    Presented a talk on debugging performance issues and memory problems in Ruby applications at wroc_love.rb 2018, Ruby Meditation #19, and Minsk.rb.

  • Ruby on Rails and programming courses (Other amazing things)

    Introductory courses to Ruby on Rails and programming for beginners.

  • BH Telecom Phone Book Search (Development)

    A TYPO3 plugin that searches Oracle DB.

  • Ganxy (Development)

    A digital content distribution startup with embeddable widgets for previewing and buying content.

  • Damir 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. Damir 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.


  • Languages

    Ruby, JavaScript, SCSS, CoffeeScript, CSS, HTML, C#, ECMAScript (ES6), PHP, T-SQL, PL/pgSQL, F#
  • Frameworks

    Granite, Ember.js, Ruby on Rails (RoR), Caliburn.Micro, Grape
  • Libraries/APIs

    jQuery, React, Chai, jQuery UI, Stripe, Authorize.Net
  • Tools

    GitHub, Git, RSpec, Shell, Vim Text Editor, Mocha, Tmux, Adobe Photoshop, Microsoft Visual Studio
  • Platforms

    Heroku, MacOS, Amazon Web Services (AWS)
  • Paradigms

    Kanban, Test-driven Development (TDD), Behavior-driven Development (BDD), Object-oriented Programming (OOP), Pair Programming, Scrum, Functional Programming, Agile Software Development
  • Storage

    PostgreSQL, SQLite, MySQL, Microsoft SQL Server
  • Other

    Technical Project Management


  • Bachelor's degree in Computer Science
    2007 - 2010
    Graz University of Technology - Graz, Austria
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