Balint Erdi, Developer in Budapest, Hungary

Balint Erdi

Software Developer

Budapest, Hungary
Toptal Member Since
August 26, 2013

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.

Balint is available for hire
Hire Balint


FullStack Consulting
Ruby on Rails (RoR), Ember.js
Ember.js, Ruby on Rails (RoR)
Secret Sauce Partners, Inc.
Ruby on Rails (RoR)


Budapest, Hungary



Preferred Environment

ITerm, Vim Text Editor

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
2013 - 2014

Rails & Ember.js Developer

  • 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)
2010 - 2013

Web Developer

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)
2008 - 2010

Rails Developer

  • 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
2004 - 2008

Web Developer
  • 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
2004 - 2004

Lotus Notes Developer

Hungarian State Treasury
  • Built a Lotus Notes application from scratch for a government program supporting NGOs.
Technologies: Lotus Notes
2003 - 2003

Java Desktop Application Developer

Hotel d'Entitats Tarragona
  • Built a Java app for a political campaign capable of being run from a CD.
Technologies: Java
2001 - 2002

Web Developer

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
1999 - 2000

C++ Developer

  • 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.
Image of The 8 Most Common Mistakes That Ember.js Developers Make publication

The 8 Most Common Mistakes That Ember.js Developers Make
Image of A Guide to Building Your First Ember.js App publication

A Guide to Building Your First Ember.js App
Image of JavaScript Promises: A Tutorial With Examples publication

JavaScript Promises: A Tutorial With Examples



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


Ruby on Rails (RoR), Ember.js


Lotus Notes, Vim Text Editor, ITerm


Writing & Editing


Devise, GitHub API, Twitter API


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


PostgreSQL, SQLite, Redis, ZODB, MySQL, MongoDB




1996 - 2001

Master's Degree in Computer Science

Budapest University of Technology - Budapest, Hungary