1.
Highway to heaven
Building microservices in the cloud
Voxxed Days Belgrade, October 2015

2.
Agenda
Meet AutoScout24
Shifting gears
How we build our services
How we organize ourselves

3.
AutoScout24 - 30.000ft
CC

4.
Baseline AutoScout24 IT
Highly optimized, but of last decade
IT platform supported growth for >6 years
Microsoft oriented stack
Enterprise IT setup - MTBF over MTTR
Proven agile and lean principles
C

5.
New CEO
CC

6.
Do you attract talent?
CC

7.
CC

8.
Project Tatsu
WW

9.
Monolith to Microservices
Data center to AWS
.NET / Windows to JVM / Linux
Devs + Ops to DevOps culture
Involve product people
Five challenges
WW

10.
Technical transformation
WW

11.
Change the wheels while driving
WW

12.
Strategic Goals
Goals of the business side
Architectural Principles
High-Level Principles
Design and Delivery Principles
Tactical measures
Reduce Time to Market
Speed, Fast Feedback
Cost Transparency
Collect metrics to allow decisions cost vs. value.
Support Data-Driven Decisions
Listen to users and validate hypothesis.
Provide as many relevant metrics & data as possible.
You build it, you run it
Responsibility to run and maintain a product stays with the
building team. Fast feedback from live and customers helps us to
continuously improve.
Organized around Business Capabilities
Build teams around products not projects. Follow the domain and
respect bounded contexts. Inverse Conway Maneuver
Shared Nothing
Avoid shared infrastructure and tight coupling as much as
possible. Don’t create the next monolith.
Macro and Micro Architecture
Clear separation. Autonomous micro services within the rules
and constraints of the macro architecture.
AWS First
Favor AWS service over managed service, over self-hosted OSS,
over self-rolled solutions.
Data-Driven/ Metric-Driven
Collect metrics from processes and applications. Analyze, alert
and act on them.
Eliminate Accidental Complexity
Strive to keep it simple. Focus on essential complexity. No silver
bullet.
Event Sourcing and Publishing
Keep history of state changes and publish application events.
Autonomous Teams
Make fast local decisions. Be responsible. Know your
boundaries. Share findings.
Continuous Delivery
Deliver changes reliable, often and fast.
Infrastructure As Code
Automate everything: Reproducible, traceable and tested.
Immutable servers over snowflake servers.
DevOps Culture
Developers and Ops work together in collaborative teams as
engineers. No silos.
Be Bold
Go into production early. Value monitoring over tests. Recover
and learn. Optimize for MTTR not MTBF.
Security & Data Privacy
Security must be first class citizen and everybody’s concern.
Keep data-privacy in mind.
CC
Another goal
Work in progress...

13.
Principles
Organized around business capabilities
You build it, you run it
Be bold
Macro and micro architecture
Shared nothing
CWCW

14.
Shared infrastructure
Shared nothing
Availability over shared nothing
Convenience offerings
No side effects
Fast local decisions over committee
Respect family ties WW

15.
How (not) to share
How many environments?
Use over re-use
Re-use only after hardening
Copy n’paste, OSS, library
Pull instead of push
WW

16.
Frontend integration
Shared nothing
Autonomous teams
One domain
High optimisation
CC

17.
Frontend integration
CC

18.
PageSpeed Module
css (page+fragment)
js (page+fragment)
ngx_pagespeed
css (page)
js (page)
css (fragment)
js (fragment)
CC

19.
Event Sourcing and data pumps
One way data highway
Event Sourcing - store history of all changes
WW

20.
SQS + S3
Kinesis + S3
Kinesis + DynamoDB
SQS + DynamoDB
Proxy + DynamoDB
DynamoDB
Evolution
WW

21.
Classified Events
WW

22.
DynamoDB as integration database?
Two kinds of coupling
Payload and connectivity
Payload is DynamoDB agnostic
DynamoDB as technical service contract
WW

23.
From documents to events
Refactoring toward deeper insight
From CRUD to sync
Offline first
Writes are expensive
USD 20 over USD 500
CC

24.
How to build autonomous teams
Do not fall back into old behaviours
Beware of Mandelbrot teams
Pager duty so that you run it
Fix broken windows
Part-time ops not working
Not all T-shapes are the same
Wolf
WW

25.
Infrastructure guild
Agree on things to do
Share learnings
Delegate implementation to teams
Empty backlog should be normal
Infrastructure product teams needed?
CC

26.
Focus sliders
Product over platform
time
WW
IT
business

27.
Focus sliders
Product over platform
Delivery over learning
time
WW
IT
business

28.
Focus sliders (cont.)
Cash stack meets shiny new stack
One company
Lights on in cash stack
Feature freeze
Where to build new features?
Ease of integration helps business people CC

29.
cdeger@autoscout24.com @cdeger
wschlegel@thoughtworks.com @wolfwolf

30.
Attributions
Blue sky, white-gray clouds by nature protector Natubico, www.vivism.info [CC BY-SA 3.0]
http://commons.wikimedia.org/wiki/File%3ABlue_sky%2C_white-gray_clouds.JPG
A Danish Perspective by NASA [Public domain] http://commons.wikimedia.org/wiki/File%3AA_Danish_Perspective.jpg
http://commons.wikimedia.org/wiki/File%3ANASAComputerRoom7090.NARA.jpg
GREG
EINRAD
Amazon16 by Neil Palmer/CIAT [CC BY-SA 2.0] https://www.flickr.com/photos/ciat/5641594952
BERGSTEIGER
Barber in Cameroon by James Emery from Douglasville, United States (Daddy Joe_1355) [CC BY 2.0]
http://commons.wikimedia.org/wiki/File%3ABarber_in_Cameroon.jpg
Wide objectives by Kivela (Own work) [Public domain]
href="http://commons.wikimedia.org/wiki/File%3AWide_objectives.jpg
Transformer Fire Barrier by GerryS1 (Own work) [CC BY-SA 3.0 or GFDL]
http://commons.wikimedia.org/wiki/File%3ATransformer_Fire_Barrier.jpg

31.
Attributions (cont)
Alonso Renault Pitstop Chinese GP 2008 by Bert van Dijk (Pitstop F1 ING Renault) [CC BY-SA 2.0]
http://commons.wikimedia.org/wiki/File%3AAlonso_Renault_Pitstop_Chinese_GP_2008.jpg
Principle of Panchasheel by Prakash Adhikary (Own work) [CC BY 3.0]
http://commons.wikimedia.org/wiki/File%3APrinciple_of_Panchasheel.JPG
Traffic Jam by Doo Ho Kim [CC BY-SA 2.0] https://www.flickr.com/photos/titicat/3049591547
Pellets by The original uploader was Richard Mayer at German Wikipedia [GFDL or CC-BY-SA-3.0]
http://commons.wikimedia.org/wiki/File%3APellets.jpg
Pipes and Valves by Uwe Hermann [CC BY-SA 2.0] https://www.flickr.com/photos/73628542@N00/6272975359
Size variation in Coccinella undecimpunctata (2127991716) by Gilles San Martin from Namur, Belgium [CC BY-SA 2.0]
http://commons.wikimedia.org/wiki/File%3ASize_variation_in_Coccinella_undecimpunctata_(2127991716).jpg
Mille crêpe by Laitr Keiows (Own work) [CC BY-SA 3.0 or GFDL]
http://commons.wikimedia.org/wiki/File%3AMille_cr%C3%AApe.jpg
Country Energy power line replacement 01 by Bidgee (Own work) [CC BY-SA 3.0]
http://commons.wikimedia.org/wiki/File%3ACountry_Energy_power_line_replacement_01.jpg
Puzzling by Bernd Gessler (Own work) [CC BY-SA 3.0] https://commons.wikimedia.org/wiki/File%3APuzzling.JPG

32.
Attributions (cont)
Sharing Sucks (4536747557) by eyeliam from Portland, United States [CC BY 2.0]
http://commons.wikimedia.org/wiki/File%3ASharing_Sucks_(4536747557).jpg
7Line 9184 (8263568241) by Metropolitan Transportation Authority of the State of New York (7Line_9184 Uploaded by
tm) [CC BY 2.0] http://commons.wikimedia.org/wiki/File%3A7Line_9184_(8263568241).jpg
England rugby team 1905 by Russell & Sons (The Graphic) [Public domain or Public domain]
http://commons.wikimedia.org/wiki/File%3AEngland_rugby_team_1905.jpg
Wandergeselle by Sigismund von Dobschütz [CC BY-SA 3.0]
http://commons.wikimedia.org/wiki/File%3AWandergeselle_02.JPG
Faber-Rechenschieber 5304 by User:Karl Gruber (Own work) [CC BY-SA 4.0]
http://commons.wikimedia.org/wiki/File%3AFaber-Rechenschieber_5304.JPG
Wheel clamps Texas by Richard Anderson from Denton, United States (Boots.) [CC BY-SA 2.0]
http://commons.wikimedia.org/wiki/File%3AWheel_clamps_Texas.jpg
GuadalupeNOLA15Oct07Thanks by Infrogmation of New Orleans (Photo by Infrogmation) [GFDL or CC BY-SA 3.0]
http://commons.wikimedia.org/wiki/File%3AGuadalupeNOLA15Oct07Thanks.jpg
AtariBasic by Calin99 (Own work) [GPL] http://commons.wikimedia.org/wiki/File%3AAtariBasic.png
Spare wheel by Brian Snelson [CC BY 2.0] https://commons.wikimedia.org/wiki/File:Spare_wheel_-_Flickr_-_exfordy.jpg