My personal recap of the Codemotion 2015 in Berlin. Had lot of good talks and saw some incredible speaker

1. CODEMOTION BERLIN 2015 - RECAP
Torben Dohrn
@nexusger
http://nexusger.de
#CodemotionBLN

2. ABOUT
This presentation was aimed at colleagues of mine to give them a recap of my
attendance on the Codemotion 2015 Berlin
I summarized some of the talks and picked some mentionable quotes. The
presentation is based completely on my notes and memory (and will likely not cover
everything)
It’s impossible to condense two days in a half an hour presentation; Go see the
originals: https://t.co/4b4KTJUaT0
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3. DAY ONE
Key Note: A programmer is…
Patterns for “infrastructure-as-code”
The Autoscout24 Technology Change – crazy or trendsetting?
DevOoops (increase awareness around DevOps infra security)
Attacks, Lies and the Underground World
Hiring Great People: how we improved our recruiting process to build a great team
A Life Less Manual - 8 Years of Test Automation
Agile Strategic Philosophy – Agile decision making based on Sun Tzu's "The Art of
War"
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4. KEY NOTE: A PROGRAMMER IS…
What is a programmer?
 The first „coders“ have been women (ENIAC
“girls”)
Where does the word “programmer”
come from?
A programmer needs to be bad with
people? (hint: no)
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Image Credit: (U. S. Army Photo), Public Domain
https://upload.wikimedia.org/wikipedia/commons/3/3b/Two_women_operating_ENIAC.gif
Speaker:
Birgitta Böckeler
@birgitta410

5. PATTERNS FOR “INFRASTRUCTURE-AS-CODE”
We need to be able to „program our
infrastructure“
Three components:
 Image
 State declaration
 Tasks
Pattern
 Secret Isolation
 Configuration discovery
 Community Module Wrapper
 …
Anti pattern
 Golden Image
 Data as Code
 „Funny File Copying“
 …
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Speaker:
Andrey Adamovich
@codingandrey

6. THE AUTOSCOUT24 TECHNOLOGY CHANGE –
CRAZY OR TRENDSETTING?
Autoscout24 is moving from on premise
.NET monolith to JVM (Scala) micro
services in the cloud (AWS)
One of the driving questions: „Do you
attract talent?“
 They found lots of good people, but seldom
these people teach them something new.
 With these move they try to harness open-
source projects and other high profile projects
Transition from monolith to micro service
via divide and conquer
Transition to cloud was and is expensive.
But they are going faster than ever
 „It‘s not about saving money, it‘s about going
faster“
 Investing in the future (EBItda)
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Speaker:
Simon Hohenadl
@SimonHoh

7. DEVOOOPS (INCREASE AWARENESS AROUND
DEVOPS INFRA SECURITY)
General security problems in the DevOps life
 GitHub: Use the search for passwords, access-Tokens, servers…
 CI-Server Jenkins is often unprotected in the web -> Jenkins is often installed as root…
 Redis, ElasticSearch, Puppet and Ansible are also not protected by default
Search Engine for „open“ server
 Shodan.io
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Speaker:
Gianluca Varisco
@gvarisco

8. ATTACKS, LIES AND THE UNDERGROUND WORLD
Some facts and busted myths about cybercrime
„Your computer is not of interest, it‘s to much work. Windows XP on the other hand…“
A security measurement needs only to make it uneconomic to hack you.
The real value for a hacker and your perceived value may differ.
 Your credit card with $1300? That‘s $5 on the black market
 Your computing power on a server? Bitcoin mining will make it profitable!
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Speaker:
Andrea Pompili

9. HIRING GREAT PEOPLE: HOW WE IMPROVED OUR
RECRUITING PROCESS TO BUILD A GREAT TEAM
Three pillars for hiring:
 Sourcing candidates
 Accessing candidates
 Onboarding new colleagues
Sourcing: How to reach new people
Accessing: How to get these people to
apply at your company
Onboarding: Give new employees a
helping hand
Lessons learned
 Reflect your recruitment process
 „Metrics, Metrics everywhere“
 Involve your team
 Value social over technical skill – cultural fit
 Value diversity
 Respect the candidate
 Hiring checklists and agenda
 Reboot your team with interns and grads
 Hire great people
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Speaker:
Pietro Di Bello
@pierodibello

10. A LIFE LESS MANUAL - 8 YEARS OF TEST
AUTOMATION I
Test are important: 2/3 of code is test code
Selenium tests: extra layer of „driver“ in the frontend test code -> Contains definition
where an element is, so only one place needs to be fixed
Interface for DateTime -> „Time Machine“ can improve test
Book: “Continuous Delivery: Reliable Software Releases through Build, Test, and
Deployment Automation (Addison Wesley Signature Series)“
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Speaker:
Michael Barker
@mikeb2701

11. A LIFE LESS MANUAL - 8 YEARS OF TEST
AUTOMATION II
Tool for checking intermittency and performance of tests
 How often does a test fail?
 Are there tests which take longer than before?
 Tool reschedules failed test again to see if they work. This test is still marked broken but you have a
hint that parallelism or the order might be the reason
Three reasons for failing test
 Bad Code
 Bad Test
 Environmental
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Speaker:
Michael Barker
@mikeb2701

12. AGILE STRATEGIC PHILOSOPHY – AGILE DECISION
MAKING BASED ON SUN TZU'S "THE ART OF WAR"
Bachelor thesis on agile planning
Mapped all aspects of the book to modern markets (special focus on mobile game
development)
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Speaker:
Huel Fuchsberger
@theaztecfox

13. DAY TWO
Key Note: Python, Inc.
Boxcars and Cabooses: When one more XHR is too much
100% Server-less: Writing Hyper-scalable Applications without Servers
Creating Better Teams Through Tools
10 days, 500K users: How we built a realtime mobile social network in South Africa
Optimizing for readability
Desired State: Containing Chaos with Kubernetes
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14. KEY NOTE: PYTHON, INC.
Good talk on how one would handle a programming language if it were a startup
Applied different business analysis on her favorite language Python
 How do I increase market share?
 How can I get/stay attractive to different target groups?
Search for one project and fix that
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Speaker:
Jessica McKellar
@jessicamckellar

15. BOXCARS AND CABOOSES: WHEN ONE MORE XHR
IS TOO MUCH
Salesforce.com api restructure
Boxcars:
CRUD API require a lot of requests
/composite/Batch
 Multiple requests in one JSON (up to 25)
 References are possible
Tree API for hierarchical data
API Limits in HTTP Header
Caboose:
High frequency request (logs) send
trailing at an „normal“ request, if one is
happen in an interval
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Speaker:
Peter Chittum
@pchittum

16. 100% SERVER-LESS: WRITING HYPER-SCALABLE
APPLICATIONS WITHOUT SERVERS
AWS Lambda provides a platform to create „one function“ services
Subscribing to events possible
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Speaker:
Oliver Arafat
@oliverarafat

17. CREATING BETTER TEAMS THROUGH TOOLS I
Positive stimuli –> 12% more productive
teams
What creates happiness
 Autonomy
 No interruptions
 No time pressure
Team communication is a problem
 People are stressed if they get interrupted or
unproductive
 Centralized task management tool (Mail,
skype…) to reduce context switches
 Persistent communication (searchable, serves as
documentation afterwards) Example: Google
Docs
For micro services respect Conways law
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Speaker:
Laura Frank
@rhein_wein

18. CREATING BETTER TEAMS THROUGH TOOLS II
Continuous Deployment reduces
 Disruption
 Distraction
„Branch driven deployment“
 Merge/commit to a special „release“ branch
pushes everything to production
Team shares responsibility for
deployment.
 „Kill switch“ for commits other than that which
have the tag „fix-deployment“
Incident Management
 Don‘t confuse priority with urgency!
 „Priority measures how important a task is, relative to other
tasks“
 “Urgency is a measure of how quickly the task must be
completed”
 Each developer need the ability to solve
problems assigned to him (rights, knowledge,
processes)
 „Post-Mortem“ after an incident
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Speaker:
Laura Frank
@rhein_wein

19. 10 DAYS, 500K USERS: HOW WE BUILT A REALTIME
MOBILE SOCIAL NETWORK IN SOUTH AFRICA
Used an open source in-app messaging stack (buddycloud) to create a wifi-chat
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Speaker:
Simon Tennant
@buddycloud

20. OPTIMIZING FOR READABILITY I
Clean Code!
„Write once, read often“
Readable code -> Saving time
Comments are an excuse of the code not
being clearer
Comments only for the „why“ not the
„what“
One language -> The business language
Code bases is a bit like a garden:
 Without maintenance wild weed (and bad
practices) take over
No broken windows
 Where one bad habit occurs more will follow
 „Magical time does not happen“
 Boy scout rule – Leave the place cleaner than
you found him
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Speaker:
Tobias Pfeiffer
@PragTob

21. OPTIMIZING FOR READABILITY II
Opportunistic refactoring
80 % code coverage is bad -> 20 % are never executed!
Code review culture
„Brown bag lunches“
Pair programming
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Speaker:
Tobias Pfeiffer
@PragTob

22. DESIRED STATE: CONTAINING CHAOS WITH
KUBERNETES
Kubernetes is the container management tool from Google
Google uses a common descendent to Kubernetes in house. (Even Google has legacy
code!)
All services on Google are container based
2 Billion container started per week
These containers can be managed by Kubernetes
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Speaker:
Robert Kubis
@hostirosti

23. TAKEAWAY
Conferences are a great way to get insights in new technologies
Chances are good, someone had the same problem as you!
 (Chances are good that you don‘t know that you have a problem…)
The Codemotion gave a good overview in beginner and intermediate task on a
broad spectrum of topics
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