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John Feminella

John Feminella

experienced developer, frequent mentor, occasional speaker

Eastern Time (US & Canada) (-05:00)
I've been a professional developer for over a decade, one of the all-time top-rated StackOverflow users, and most importantly, I love mentoring and helping people solve problems. Drop me a line if you'd like to chat!
Ruby expert help Ruby - 9 years experience
I've written a number of major production web applications and supporting libraries/microservices in Ruby. Collectively they're serving around a billion web requests per month! I've been a regular speaker at a number of Ruby conferences (around two dozen) and a prolific StackOverflow contributor on this topic.
Csharp expert help C# - 10 years experience
I've written .NET apps large and small and everywhere in between, primarily service applications using C# with periodic heavy doses of web development thrown in with ASP.NET MVC.
No icon Testing - 10 years experience
I'm an experienced software auditing professional who believes testing is not merely important for reducing defects but also critical to developing an understanding of how one wants software to work.
Coffeescript expert help CoffeeScript - 2 years experience
I frequently reach for CoffeeScript because I'm often hacking on projects that I already use it. While I generally think that transpiled-to-JS languages are an unnecessary fad that don't add substantive value, I think they also have their place in some situations.
Git expert help Git - 6 years experience
Git is my go-to version control system. It's fast, efficient, and effective. Sometimes it's a little overwhelming for beginners, especially if they're coming from a VCS that's not distributed, but despite these minor drawbacks Git is a major part of my daily workflow.
Ruby on rails expert help Ruby on Rails - 5 years experience
Javascript expert help JavaScript - 8 years experience
Java expert help Java - 8 years experience
Mongo db expert help MongoDB - 3 years experience
Html css expert help HTML/CSS - 10 years experience
HTML, CSS, and Javascript are the lingua franca of the web domain. I've been using them productively for years and have the battle scars to prove it.
Python expert help Python - 8 years experience
 Reputation: 178574
  •  Gold Badge: 29
  •  Silver Badge: 273
  •  Bronze Badge: 308
Average Rating
(17 ratings)
Awesome mentor!
Pretty good
Could've been better
Needs improvement

John was very knowledgable and helpful. He's a good communicator and easy to work with. He had to cancel a session once but communicated it as soon as he could and rescheduled as soon as he was able. I had a good experience and was happy with how it was handled. I would seek his help in the future.
Todd Metheny Apr 05, 2015

Very patient, and explained things as often as it was necessary for me to grasp what was going on.
Jason V. Mar 30, 2015

John is very knowledgable about Bluetooth, and was able to help us figure out some dead ends before we invested time implementing the wrong stuff.
jason warren Mar 27, 2015

John was awesome. He gave me good insight on how to build object in a thread-safe for Sidekiq. Before the mentoring session, he also made a point to get a general understanding where I was having trouble so we didn't waste time coming up to speed.
Taylor Brooks Feb 25, 2015

John resolved my issues quickly and perfectly, he was great!
Jared Galanis Feb 23, 2015

Very helpful and informative. Paused the session several times to troubleshoot an issue with my configuration etc. Great experience, thanks!
Brett Jan 24, 2015

John was a great teacher and walked my through how to solve our issue. He proposed several options for the various issues we had, and explained the pros and cons of each one. I cant thank him enough for his help.
Tony Castiglione Jan 12, 2015

Great mentor. Very happy with session.
Nick Jan 04, 2015

Quickly understood the problem and paused our hangout when there were streaming issues.
Mitch Kessler Dec 08, 2014

Knows everything about rails! Very easy to understand.
Grant Sanders Dec 07, 2014

John was extremely helpful in solving my problem (debugging a difficult-to-solve concurrency error that crossed Rails, Go, Postgresql, MongoDB, and Docker!).
falconwing Nov 25, 2014

He was great at explaining the code and breaking it down. I was able to understand his suggestion while being able to complete my assignment. I recommend using this mentor.
J. Simmons Nov 17, 2014