Ezekiel Chentnik Principal Front End Engineer / UX Designer

Data-Driven JavaScript developer

Known for innovation, ideas, and high velocity. Relentless creativity, large scale problem solving, and results.


Hello, you can call me Zeek. I'm currently working on a large scale maps/geo data system in Amsterdam, NL. I'm a technical reviewer for multiple Backbone.js books, a Backbone.js master class, and zepto.js books. I enjoy improving the world through JavaScript, Mobile, and UX Design by using A/B testing.



Backbone.js, Zepto.js, iBooks

Work Experience


Senior JavaScript Engineer – Booking.com (Priceline Group)

  • [contact for project specifics & incredible performance summary]
  • Data-driven product development focused on ROI, scalability, and customer focused innovation
  • High velocity JavaScript development & UX Design (Maps & Geo Data Team)
  • Large scale A/B & multivariate testing

Team Lead, Senior Software Engineer – Journal Communications

  • Team Lead for 10 software engineers (Backend, Front-end, UX Design)
  • Responsible for onboarding, mentoring, and training new tech division
  • High traffic projects: Mobile web apps, payment gateway, responsive web design, Single Page Applications, Client side MVC frameworks, Data APIs & web services.
  • App Demo: Mobile Web App with native UX (Backbone.js, Restful API, Zepto.js) View >>>
  • Presentation: Best of Brew city mobile web app (Backbone.js, AppMobi, Geo API, Native UX) View >>>
  • Technologies: JavaScript, CSS3, HTML5, Backbone.js, Zepto.js, C# .net, Java, Marionette.js, Angular.js, Underscore.js, (Web Services, AJAX, JSON/P APIs), Phonegap, jQuery mobile, Twitter Bootstrap, Foundation, Skeleton, Brightcove Video, Google Maps

Lead Software Engineer, Team Mentor (China) – Journal Communications

  • Architecture and development of web & mobile web apps (SCRUM master)
  • Project examples: data driven interactives, mobile web apps, data APIs, video interactives, photo galleries, and interactive maps/charts/graphs.
  • Interacting with multiple technologies, APIs, Applications, and design practices (responsive, mobile first, progressive enhancement).
  • Paywall system, MVC framework, large scale site portfolio (80+)

Mobile Developer, Front-End Engineer – JRN

  • Architected multimedia gallery - increasing monthly organic media traffic by 1,037% (total 4 million)
  • Implemented mobile web app - increasing monthly mobile traffic by 1,025% (total 2 million)
  • Designed video widget - increasing monthly multimedia traffic by 1,000% (total 2 million)
  • Support velocity increased by 435% in 2007
  • Team Lead: CSS/HTML/JavaScript/CMS framework and best practices to facilitate design & backend developer velocity
  • Developed & Designed: blog system (converted 100+ blogs to system), forums, photo galleries, content ratings, user submitted content, events, classifieds (integrating various data APIs), taxonomy, tracking, ad delivery system

Front-End Developer, UX Designer – Milwaukee Journal Sentinel

Web development for hundreds of enterprise level (high traffic) sites across multiple diverse nationwide media markets.

Coding / Skills

  • JavaScript

  • CSS / HTML

  • Node.js

  • App Architecture

  • A / B Testing

  • Data Analysis

  • Rapid Prototypes

  • User Research

  • Agile / Scrum

  • Mentoring

Personal Skills

I am passionate about people, user experience, data, innovation, and JavaScript

  • High Velocity
  • Data Driven
  • Energetic Brainstorming
  • Loves Results
  • Innovative & Creative
  • People Developer
  • Team Leader


"If only I could clone Zeek!" ­Director of Digital Strategy

"We were forming a new team in an area that had failed for years when Ezekiel joined us. By the time he left we were the highest performing team in a big tech organisation where high performance is the norm. He pushes hard, has high standards and delivers..." - Sr. Product Owner, Booking.com

Education / Awards


Certifications / Awards

  • UWM - BBA - Management Information Systems
  • ADA/Accessibility training - paciellogroup
  • Bocoup workshops/training - node.js, backbone.js, testable JavaScript, etc.
  • Optimizely Technical Training
  • Highest performer - NM FSP, Milwaukee
  • The Art of Influence – Amsterdam, NL
  • SEO & Web Analytics Training – Omniture
  • CMS Engineer – Clickability, San Francisco
  • Journal Interactive INSPY (Inspirational Performance award)
  • Best overall local news site in America
  • EPPY for Best weekly newspaper website (26 sites)
  • Best Local Mobile Web APP (2013)

Bachelor Degree – UWM (Milwaukee)

Management Information Systems - Discovered passion for Web App Development, UX Design, & JavaScript

Technology Experience

I've touched alot of technologies. My favorite is obviously JavaScript. These are the most recent.

React, Flux, Redux, Alt.js, JSX, Babel, Webpack, Immutable.js, Service Workers, PostCSS, Backbone.js, Ramda, Lodash, Cycle.js, RxJS, Hapi, express, Leaflet Maps, Google Maps, Browserify, Gulp, d3.js, Mocha, Chai, Jasmine, Optimizely, Cordova, Phonegap, React Native, NPM, Git, SASS, LESS, MV*, Angular.js 2, Team City, Docker, Ansible, Kubernetes, Apigee, MySQL, MongoDB, Firebase, PouchDB, Vagrant, React Native, Swift, RxJS, Stampit, Riot.js, MapBox, Open Street Maps, Geo JSON, Ionic Framework, Marionette.js, Spine.js, Knockout.js, Phantom.js,jquery.flot.js, Raphael.js, SVG, Canvas, Backbone.js, Gulp, Rachet.css, Zepto.js, Ember.js, Dojo, YUI, Grunt.js, Kraken.js, Node.js, PHP, Wordpress, Ghost, Batman.js, Rivets.js, jQuery Mobile, CORs, CSS3 Animation, iBooks, dc3.js, Python, C#, ASP.Net, .Net 3.5 & 4.0, Classic ASP, SQL, MySQL, ActionScript 2/3 (Flex), Cold Fusion, XML, XSLT, BrightCove, vzaar, Perl (yes.. perl), alot more....