Functional Geekery Episode 79 – Lennart Fridén

In this episode I talk with Lennart Fridén. We talk his entry into Elixir, working to help build the Stockholm Elixir group, his Journeyman Tour, Mob Programming, and more.

Our Guest, Lennart Fridén

@DevLCSC on Twitter
DevL on Github


This episode is sponsored by Use the coupon `geekery` to save $9 on your first month, and make learning part of your daily routine with


f(by) is coming up on the 10th of December in Minsk, Belarus. Visit to find out more and to register.

Lambda Days will be taking place again on the 9th and 10th of February 2017. Visit to submit your talk and keep updated as more information becomes available.

Kats Conf 2 will be taking place in Dublin, Ireland on the 18th of February. Visit to register and for more information.

ClojureD will be taking place on the 25th of February, 2017, in Berlin, Germany. Visit to get tickets and keep updated as more information becomes available.

BOB Konf is taking place the 24th of February 2017 in Berlin, Germany. Visit for more information about the conference.

ElixirDaze is coming up on March 2nd and 3rd. With keynotes by Prag Dave Thomas and Saša Jurić, make sure to visit for more information and to register.

Destination Code, a new unconference starting in Utah, is having its inaugural event March 27-30th, 2017. Visit to find out more.

Erlang & Elixir Factory 2017 is on the 23rd and 24th of March. Visit for more information.

flatMap(Oslo) is a FP-conference with focus on Scala and the JVM, taking place on May 2nd and 3rd in Oslo, Norway. Please go to to learn more.

Elm Europe will be taking place June 8th and 9th in Paris, France. Visit for more information and to register.

If you have a conference related to functional programming, contact me, and I will be happy to announce it.


About Lennart
Stockholm Elixir Meetup Group
Lennart mini-interview at ElixirConf 2015
How Lennart came to Elixir
C as a high level language coming from Assembly
General enthusiasm around Elixir regardless of when one came from
“There’s an intrinsic fun in going deeper”
Elixir as the language of the year
The Pragmatic Programmer
Erlang on Xen [Ling]
Lennart’s presentation at ElixirConf 2015
Being called up to the Principle’s Office by Björn Gustavsson
Building a community with the Stockholm Elixir group
Go Language
Importance of getting people involved early
“You don’t have to be a Joe Armstrong, or Robert Virding to talk about the language”
Overview of Lennart’s Journeyman Tour
“I got to go in knowing a lot less [than the teams I worked with]”
Lennart’s announcement blog post
Mob Programming
Woody Zuill
“Pair programming on steroids”
Creating a Key-Value store as a mob exercise for a user group meeting
Lennart on Elixir Fountain
Mob Programming sessions to show off Elixir
Mob Programming to spur excitement more than just a presentation
Mob programming as a Trojan Horse […] to show off Elixir
“The more you work with people, the closer you work with people, the more interesting they become”
Erlang and Elixir and shared environment and community
LFE (Lisp Flavoured Erlang)
Mob Programming Conference in Boston on April 6th and 7th
Agile Games
Lennart’s Blog
Elixir Conference Europe
Elixir Conference US in Bellevue, Washington
Erlang User Conference

As always, a giant Thank You goes to David Belcher for the logo design.

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