Hi, I am Felix Geisendörfer, a programmer and entrepreneur living in Berlin, Germany.
Currently I'm writing software in Go as a contractor.
|Go + Raspberry Pi powered Alarm Clock||Mar 05, 2015|
|Using TCP keepalive with Go||Aug 26, 2014|
|GoDrone - A Parrot AR Drone 2.0 Firmware written in Go||Dec 25, 2013|
|Vim Trick: Open current line on GitHub||Aug 08, 2013|
|The Pull Request Hack||Mar 11, 2013|
|Open Source And Responsibility||Mar 07, 2013|
|Hello World||Mar 03, 2013|
I have been blogging since 2006, my older posts can be found here.
After speaking a little too much in 2012, I've heavily cut down on events, but I still enjoy speaking ocassionally, so reach out if you'd like to invite me to an event.
|tus.io - Squeezing Cats Through Tiny Mobile Tubes||JSConf.us, Florida||May 29, 2013|
|tus.io - Squeezing Cats Through Tiny Mobile Tubes||Web Rebels, Oslo||May 23, 2013|
|tus.io - Resumable file uploads for web and mobile apps||Codemotion Berlin||May 11, 2013|
|tus.io - Resumable File Uploads · pdf||UIKonf Preparty, Berlin||May 01, 2013|
|Programming an AR Drone Firmware in JS (de) · pdf||Denkwerk, Cologne||Dec 12, 2012|
|Programming an AR Drone Firmware in JS (de) · pdf · video||Cologne JS Usergroup||Dec 11, 2012|
|Faster than C? · pdf||Prague JS Usergroup||Nov 29, 2012|
|Faster than C? · pdf||Nodeconf.it, Italy||Nov 11, 2012|
|The power of node.js (with quadcopters) · pdf · video||Øredev, Malmö||Nov 05, 2012|
|Faster than C? · pdf · video||NodeDublin||Oct 18, 2012|
|Faster than C? · pdf · video · code||JSConf.EU, Berlin||Oct 07, 2012|
|The power of node.js (with quadcopters) · pdf||Developer Conference, Hamburg||Sep 07, 2012|
|The zen of node.js · pdf · video||Campus Party Europe, Berlin||Aug 22, 2012|
|Node.js Quadcopter Programming · pdf||Berlin JS Usergroup||Aug 16, 2012|
|As fast as C? · pdf · video||London Node.js User Group||Jun 27, 2012|
|Node.js - A practical introduction · pdf||Big Techday, Munich||Jun 15, 2012|
|The Node.js Scalability Myth · pdf||Munich Node.js User Group||Jun 14, 2012|
|Node.js in production · pdf · video||Web Rebels, Oslo||May 26, 2012|
|Bootstrapping Transloadit.com · pdf||Roots, Bergen||Apr 27, 2012|
|The Node.js Scalability Myth · pdf||Roots, Bergen||Apr 27, 2012|
|The Node.js Scalability Myth · pdf||Mix IT, Lyon||Apr 26, 2012|
|The Node.js Scalability Myth · pdf||Berlin JS Usergroup||Mar 15, 2012|
|Node.js - Best Practices · pdf · video||Munich Node.js User Group||Dec 01, 2011|
|Node.js - A practical introduction · pdf · video||Munich Node.js User Group||Dec 01, 2011|
|Node.js - A practical introduction · pdf · video||Øredev, Malmö||Nov 09, 2011|
|Building an alarm clock with node.js · pdf||Reject.js, Berlin||Oct 29, 2011|
|Node.js - Eine praktische Einführung||Developer Conference, Hamburg||May 21, 2011|
|How to Test Asynchronous Code||Berlin JS Usergroup||May 19, 2011|
|How to Test Asynchronous Code · pdf||NodeConf, Portland||May 05, 2011|
|Node.js - A quick tour · pdf||Gameforge AG, Karlsruhe||Apr 20, 2011|
|Transloadit · pdf||Startup Riot, Atlanta||Feb 16, 2011|
|Node.js - Should Ruby Developers Care? · pdf||Atlanta Ruby Meetup Group||Feb 09, 2011|
|Node.js in production · pdf||Berlin JS Usergroup||Jan 20, 2011|
|Node.js as a networking tool · pdf · video||27C3, Berlin||Dec 28, 2010|
|Node.js - A quick tour||Ruby User Group Berlin||Oct 07, 2010|
|Dirty - How simple is your database? · video||JSConf EU, Berlin||Sep 25, 2010|
|Node.js - A quick tour||Hamburg.js User Group||Mar 04, 2010|
|Node.js - A quick tour||Berlin JS Usergroup||Jan 12, 2010|
|Recipies for successful CakePHP projects||CakeFest, Berlin||Jul 11, 2009|
|jQuery and CakePHP||CakeFest, Buenos Aires||Dec 05, 2008|
|Git and CakePHP||CakeFest, Buenos Aires||Dec 02, 2008|
|With jQuery & CakePHP to World Domination||CakeFest, Orlando||Feb 06, 2008|
|ActiveDOM||jQuery Camp, Cambridge||Oct 27, 2007|
I'm currently providing development services in Go, but in the past I've focused on consulting on node.js projects and a few of my clients where kind enough to say nice things about it:
Felix did a code review of our Node.js driver software. He came to us highly recommended, and now we understand the reasons for the high praise. He is extremely skilled, capable and balanced. He gave us excellent input about how to improve performance and coding standards. He worked quickly, efficiently and professionally. I strongly endorse Felix as an expert resource for Node.js projects.Fred Holahan, VoltDB, Inc.
Felix took our legacy PHP API - and replatformed it in NodeJS - in 2 weeks flat. He worked with our internal teams to build capability and skills - in doing so and left us with a well formed, performant scalable piece of Node wizardary.Nilan Peiris, Holiday Extras
As soon as you meet Felix, you know that you are talking to a special person, who is a true professional. Beyond his deep knowledge in the node.js platform, he has a rare talent for finding good and simple designs and architectures that will make your code more secure, elegant and maintainable.
We hired Felix in order to review our back-end code. Felix came with extremely high motivation and managed to go over most of the critical parts of the code in one day. The insights that he provided us were so valuable, that months later we are still fixing parts of the code and developing new features with Felix's comments and recommendations in mind.
If you are developing software, and you would like to make sure that you are doing it the right way, you should hire FelixItamar Weiss, UPcload
Felix is fantastic to work with - he is an expert in his domain and possesses an amazing ability understand and articulate problems and solutions, while also being one of those rare engineers whose productivity and quality are second to none.
I would happily work alongside Felix on any project, and would encourage anyone else to take the same opportunity.Chris Leishman, ScreenSpeak
We are currently building a webservice with node.js which has very high performance demands. To check our codebase we recently booked Felix for a one-day code review session.
Without much introduction needed from our side we first listed the topics we wanted to discuss and were then immediately able walk through the critical paths of our code and discuss the relevant questions. Felix lead through the day in a very structured way and we had very fruitful discussions where the whole team could benefit a lot from Felix' incredible knowledge on software development in general and on node.js and webservices in particular. The day after the code review Felix provided us with a written wrap-up which contained all the conclusions drawn from our discussions during the review-session.
My availability for 2013 is limited, so email me if you need help with a project.
When not sitting in front of a computer, I enjoy a wide variety of sports. During the summer I mostly focus on playing beach volleyball, competing in tournaments pretty much every weekend. Other summer time passions of mine are street unicycling and slacklining. During the colder months I enjoy snowboarding, squash and badminton.
My primary e-mail is firstname.lastname@example.org.
I love meeting new people, so if you're in Berlin, I'm almost always up for having lunch or something - just get in touch!
Please use Github for any questions or bug reports concerning my open source projects, this way the information can become useful to everybody.
I try to answer all e-mails, but sometimes I have a bit of a backlog.