David Lowenfels
Mentor
(6 reviews)
US$25.00
For every 15 mins
3
Sessions/Jobs
ABOUT ME
Ruby/Rails and Digital Signal Processing expert
Ruby/Rails 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.
English
London (+00:00)
Joined February 2015
EXPERTISE
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.
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.
10 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.
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
(6 reviews)
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
July 2015
Doing great work!
Kadil Anamki
June 2015
Did a great work implementing the code and explaining the mathematical steps.
Removed User
March 2015
Great guy got right to the problem and helped me fix it.
SOCIAL PRESENCE
comfyui-tcd-scheduler
Trajectory Consistency Distillation (TCD) sampling for ComfyUI
Python
84
8
radspberry
real-time audio dsp library for ruby based on ffi-portaudio
Ruby
19
2
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',...
EMPLOYMENTS
Sr. Rails Dev / AI Consultant
No Logo Media
2023-01-01-2025-12-01
- Led grant-funded AI initiative to develop a custom data pipeline (scraping and tagging) for customer-facing chatbots, from proof-...
- Led grant-funded AI initiative to develop a custom data pipeline (scraping and tagging) for customer-facing chatbots, from proof-of-concept to production in 3 months.
- Spearheaded refactoring of legacy codebase to enhance modularity and maintainability, boosting test coverage by 300%.
- Mentored the product team on agile methodologies, user stories, and automated testing.
- Minimized deployment risks and improved production uptime by 20%, by implementing a CI/CD pipeline and staging server.
Ruby on Rails
Heroku
Web Scraping
View more
Ruby on Rails
Heroku
Web Scraping
JavaScript
API Integration
Tailwind css
Job Hunting
LLM
View more
Sr. Rails Dev
Homey.co.uk
2025-01-01-2025-02-01
- Delivered crucial product features and resolved urgent bugs working alongside senior developers, designers, and QA specialists.</...
- Delivered crucial product features and resolved urgent bugs working alongside senior developers, designers, and QA specialists.
- Strengthened security infrastructure with IP geofencing and logging; built custom document template editor; established JSON validation for webhook control panels.
- Enhanced Scrum process and development infrastructure to enhance team productivity, and foster a more collaborative culture.
Ruby on Rails
Heroku
Sidekiq
View more
Ruby on Rails
Heroku
Sidekiq
RESTful API
Stimulusjs
Tailwind css
View more
Lead Architect (HW/SW)
MindSpa
2022-01-01-2023-12-01
- Designed and prototyped an embedded system for light/sound brainwave entrainment.
- Developed a custom interpreter and mult...
- Designed and prototyped an embedded system for light/sound brainwave entrainment.
- Developed a custom interpreter and multi-channel sequencer to play back 12 user programs stored on EEPROM.
C++
Arduino
Hardware Engineering
View more
C++
Arduino
Hardware Engineering
LED Strips
Dsp platforms
View more
PROJECTS
Harmonic ExplorerView Project
2025
cutting-dege Astrological / Astronomical calculation framework for professionals
cutting-dege Astrological / Astronomical calculation framework for professionals
HTML/CSS
Ruby on Rails
SVG
View more
HTML/CSS
Ruby on Rails
SVG
JavaScript
Stimulusjs
View more