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David Lowenfels

David Lowenfels

Mentor
5.0
(6 reviews)
US$50.00
For every 15 mins
3
Sessions/Jobs
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First 15 mins free for your first session
ABOUT ME
Ruby and Digital Signal Processing expert
Ruby and Digital Signal Processing expert

Lifelong coder, experienced Rails engineer (since Rails 1.0), degrees from MIT and Stanford. Founder at ScrumNinja and Internaut Design. Expert communicator. Knows best-practices of industry. I am also an expert in audio signal processing.

My typical Rails contract-hire clients are startups working on their MVP.

English
Pacific Time (US & Canada) (-07:00)
Joined February 2015
EXPERTISE
HTML/CSS
11 years experience
Use daily in my software work
Use daily in my software work
Git
7 years experience
Use daily in my software work.
Use daily in my software work.
Signal Processing
13 years experience | 1 endorsement
see above, DSP
see above, DSP
SQL
10 years experience
Ubiquitous in my web app work. Know the basics but there are others better than me.
Ubiquitous in my web app work. Know the basics but there are others better than me.
Ruby
9 years experience
Use daily in my software work. Familiar with advanced features like metaprogramming.
Use daily in my software work. Familiar with advanced features like metaprogramming.
Ruby on Rails
9 years experience
Use daily in my web work, since Rails 1.0. Also quite familiar with testing.
Use daily in my web work, since Rails 1.0. Also quite familiar with testing.
jQuery
9 years experience
Use for dynamic HTML manipulation. Familiar with typical usage, designed extensive drag & drop functionality for ScrumNinja
Use for dynamic HTML manipulation. Familiar with typical usage, designed extensive drag & drop functionality for ScrumNinja

REVIEWS FROM CLIENTS

5.0
(6 reviews)
Kyle Reiff
Kyle Reiff
October 2018
David was great to work with - he gave me some great direction both for my specific problem and also for maintaining my code in the future so that it is more serviceable.
Kadil Anamki
Kadil Anamki
July 2015
Doing great work!
Kadil Anamki
Kadil Anamki
June 2015
Did a great work implementing the code and explaining the mathematical steps.
Removed User
Removed User
March 2015
Great guy got right to the problem and helped me fix it.
SOCIAL PRESENCE
Quick Tips
the cocoon gem is a nice solution to dynamically add/remove nested form fields
https://github.com/nathanvda/cocoon the cocoon gem is a nice solution to dynamically add/remove nested form fields, giving you two helper methods and some...
how to replace a partial in rails with ajax and jquery
class SomeController < ApplicationController   def show     respond_to do  |format|       format.json { render_to_string partial: 'model/partial',...