Balint Erdi, Developer in Budapest, Hungary
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Balint Erdi

Verified Expert  in Engineering

Writing & Editing Developer

Budapest, Hungary
Toptal Member Since
February 26, 2014

Balint lives on the cutting edge of technology and has been practicing TDD since before it became popular. He was a classic PHP developer, and has since moved on to Java, Python, and Ruby. Currently, he is in love with Ember.js. He is fascinated by functional programming and also enjoys Clojure.



Preferred Environment

ITerm, Visual Studio Code (VS Code), Chrome

The most amazing... contribution I've made lately is adding a version of a link-to helper in Ember.js.

Work Experience


2014 - PRESENT
FullStack Consulting
  • Build an ambitious web app with Ember.js that I can't say anything about yet :).
Technologies: Ruby on Rails (RoR), Ember.js

Rails & Ember.js Developer

2013 - 2014
  • Helped develop a couple of Ember.js apps for insurance companies.
  • Held an Ember.js "Up & Running" workshop at Eurucamp, Berlin for ~25 people.
  • Held a 1-day, intensive Ember.js training session for 3 developers.
  • Created a 7-piece screencast series called "Build an Ember.js app".
  • Started an email list and expanded it from 0 to 400 subscribers in 5 months. Created and sent out content every Wednesday.
Technologies: Ember.js, Ruby on Rails (RoR)

Web Developer

2010 - 2013
Secret Sauce Partners, Inc.
  • Created Fit Predictor, an app to find a shopper's best fit in seconds using data mining techniques on data that retailers already have, without the need for physical measurements. Launched in 8 global markets including the US. Proved the technology using A/B testing to increase conversion and reduce returns. Implemented Fit Predictor to be omni-channel, supporting 1400+ brands and over 1 million shoppers.
Technologies: Ruby on Rails (RoR)

Rails Developer

2008 - 2010
  • Created a site built on fetching and processing financial data on the back-end as a periodic job and displaying it to the user on a nice UI (
  • Created a small addendum handling ticket management (
Technologies: JavaScript, Ruby on Rails (RoR), Ruby

Web Developer

2004 - 2008
  • Worked on several projects, including, the US market-leading blog advertising software. Developed new features and handled day-to-day maintenance.
  • Tutored a Python course for fellow developers.
  • Implemented an algorithm to find the earliest time slot for a specific ad on a specific blog.
Technologies: Python

Lotus Notes Developer

2004 - 2004
Hungarian State Treasury
  • Built a Lotus Notes application from scratch for a government program supporting NGOs.
Technologies: Lotus Notes

Java Desktop Application Developer

2003 - 2003
Hotel d'Entitats Tarragona
  • Built a Java app for a political campaign capable of being run from a CD.
Technologies: Java

Web Developer

2001 - 2002
Allied-Visions GmbH
  • Developed and maintained Logitech's e-shop and several other online shops as part of a small team.
Technologies: Lotus Notes, Java

C++ Developer

1999 - 2000
  • Started at Ericsson as an intern and was promoted to a Part Time Developer position.
  • Developed protocol simulators.
Technologies: C++

BlogAds ( backend
I was one of the main developers working on the back-end of Blogads, a very savvy US blog advertising platform. Starting as a (very) junior Python developer, I became experienced enough to hold training sessions for fellow developers after 2.5 years.

Web developer for Fit Predictor (
As one of the key employees of a Silicon Valley startup, I was one of the four developers who got the product off the ground. Technologies used include Ruby (Rails), Node.js, CoffeeScript, and a bit of Backbone.

Web shop development for Logitech

As part of a small company, we built the eCommerce site for Logitech and a couple of related, smaller sites.

Freelancer Rails developer
Worked with several clients to make their business ideas into reality (,, etc.).

Ember.js developer, trainer & consultant
Intrigued by front-end development, I fell in love with Ember.js and went from zero knowledge to being an expert of the framework in 6 months. I held several workshops and gave presentations at various conferences.

Curator of an Ember.js newsletter

I loved Ember so much that I launched a mailing list. I created a screencast series that goes through the building of an Ember application step-by-step. I now send an article or best practice tip each week to my mailing list, which grew from 0 to 400 members in the span of 5 months.


Ruby, JavaScript, CoffeeScript, C++, Java, Python, Clojure, TypeScript


Ruby on Rails (RoR), Ember.js, Chrome


Lotus Notes, Vim Text Editor, ITerm


Writing & Editing


Devise, GitHub API, Twitter API


Object-oriented Programming (OOP), Agile Software Development, Functional Programming


Visual Studio Code (VS Code), MacOS


PostgreSQL, SQLite, Redis, ZODB, MySQL, MongoDB

1996 - 2001

Master's Degree in Computer Science

Budapest University of Technology - Budapest, Hungary

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