Jarek Zmudzinski
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Jarek Zmudzinski

Full stack web developer, Team leader


Poznan, Poland


Currently Software Development Manager in Allegro Group focusing on the subject of Big Data. I am a full stack web developer capable of delivering whole web applications from engine to layout, with over 12 years of experience in writing web applications and websites. During this time I've worked remotely full time for companies in New York (2 years) and in France (6 months).I tend to see myself as Software Engineer choosing technology appropriate to task at hand. I code primarily in Ruby and Ruby on Rails, and more recently I've jumped on a band wagon of Meteor.js popularity. These technologies allow ... moreme to deliver whole applications in no time. Since I've heard about genetic algorithms almost 20 years ago, I tried to focus on some machine learning problems, lately testing my skills on Kaggle platform and completing part of Data Science track on Coursera. I am perpetually trying to use these skills in my current job, proposing data science solutions that could transform some of our products and procedures, from Financial Accounting, through Managerial Accounting, down to the core of our IT products. Some of my proudest accomplishments are: - Single handedly writing fully functional Groupon clone - Citeam.pl, from layout, through Ruby on Rails engine, up to scalable deployment in the cloud. The whole app had been completed within 3 weeks. - I have developed a Ruby on Rails CMS, as my pet project, which serves all webpages I have created for various customers throughout years - Over 20 minimalistic webpages, served by above mentioned CMS, beautifully designed by MINIMA agency. - Coauthored huge Ruby on Rails CRM application, working remotely for New York based company Direct Interactive - Ruby on Rails engine of Trzymajtempo social sport site (trzymajtempo.pl). - Played major role in a few more RoR applications. Fluent English speaker, proven by Certificate of Proficiency in English. Specialties: Ruby, Ruby on Rails, Meteor, Cloud, SOA, HTML, CSS, JavaScript, usability, team management, agile methodologies, scrum, Mac OS, Linux less

Jarek Zmudzinski has added 13 portfolio pieces. Create an account to review them.

Work History and Feedback

  • Mar 2010 - Apr 2010

    iPhone Architect
    $250.00 earned
    Fixed Price

  • Feb 2010

    HTML Form Design
    Jarek is a seasoned professional who made a difficult project look easy. His technical skills are matched by his initiative and attention to detail. He is easy to work with, flexible to change requests and delivers timely, comprehensive deliverables. For any "high-end" project, he is highly recommended.
    $30.00 / hr
    $444.44 earned

Jarek Zmudzinski has more jobs to show. Create an account to review them.


Name Score (out of 5) Time to Complete
Upwork Readiness Test for Independent Contractors and Company Managers 5.00 1st Place! 26 mins
Ruby on Rails 2.3 Test 4.00 Top 20% 29 mins
DHTML Test 4.40 Top 10% 31 mins
CSS 2.0 Test 4.50 Top 10% 29 mins
JavaScript 1.3 Test 4.00 Top 20% 24 mins
iPhone Programming OS 2.1 Test 3.20 Above Average 49 mins
HTML 4.01 Test 4.25 Top 10% 33 mins
SQL Test 3.10 Top 20% 38 mins

Work History

50 hours worked
3 jobs


As Needed - Open to Offers

Associated with

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Toro Negro
50 hours

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