Retours sur l’aventure Capitaine Train

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A look back at CAPITAINE TRAIN

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A look back at CAPITAINE TRAIN *aka Captain Train, aka Trainline *

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Disclaimer We don’t work at Trainline anymore. Everything discussed in this presentation relates to what we experienced from 2013 to 2017.

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2009 Capitaine Train founded

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2009 Capitaine Train founded May 2010 Beta website

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n May 2010 Beta website October 2012 Public website

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October 2012 Public website March 2013 Cyril’s arrival

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March 2013 Cyril’s arrival October 2013 iOS app

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October 2013 iOS app November 2013 Mathieu’s arrival

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November 2013 Mathieu’s arrival March 2014 Android app

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March 2014 Android app July 2014 Android Wear app

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July 2014 Android Wear app September 2014 Flavien’s arrival

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September 2014 Flavien’s arrival September 2015

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September 2015 October 2015 Flavien left

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October 2015 Flavien left November 2015 Jérémie’s arrival

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November 2015 Jérémie’s arrival Trainline buys Captain Train March 2016

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Trainline buys Captain Train March 2016 September 2016

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September 2016 2017 We all leave

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Recruiting smart people is hard Take your time and be demanding

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What are we looking for?

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Autonomy What are we looking for?

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Autonomy What are we looking for? • Curiosity

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Autonomy What are we looking for? • Curiosity • Honesty

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Autonomy What are we looking for? • Curiosity • Honesty • Involvement

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A multi-step process Application Quiz Technical project Face-to-face interviews

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Step 1 Application

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Capitaine Train 20 rue Saint-Georges 75009 Paris France Capitaine Train Pre-Interview (Android) 1. What is the difference between LinkedList and ArrayList? 2. What is the difference between an interface and an abstract class? 3. What is the difference between fnal, fnally and fnalize? 4. What is an Adapter? How to use it? How to create one in your project? Step 2 Quiz

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Step 3 Technical project “ Make an app using the Star Wars API at https://swapi.co/

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Step 4 Face-to-face interviews

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It doesn’t make sense to hire smart people and then tell them what to do; we hire smart people so they can tell us what to do. – Steve Jobs “

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Company values Minimise interruptions Trust by default

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Letting you do your best work

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A scattered Android team Cyril Jérémie Mathieu

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Synchronise time together In Paris oﬀice at the same time

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Take advantage of time together

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Meetings

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Meetings Make decisions

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Meetings Make decisions Confront ideas

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Meetings Make decisions Confront ideas In person - Hangouts

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Meetings Make decisions Confront ideas In person - Hangouts Keep a written record

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Regular meetings

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Regular meetings Sync with release

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Regular meetings Sync with release Assign features wisely

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Regular meetings Sync with release Assign features wisely Check progress

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Regular meetings Sync with release Assign features wisely Check progress About every 2 weeks

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Impromptu meetings

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Impromptu meetings Discuss feature design technical solutions

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Impromptu meetings Discuss technical solutions feature design

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Making remote work Keep communicating

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Text communication

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Text communication Share knowledge

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Text communication Share knowledge Ask questions

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Text communication Share knowledge Ask questions Transmit information

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Text communication Share knowledge Ask questions Transmit information Video when needed

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Importance of being offline

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work in autonomy communication

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Keep it simple, stupid aka KISS principle

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Keep in mind the long run

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After v27 - 06/12/2016 Before v1 - 03/03/2014

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After v27 - 06/12/2016 Before v1 - 03/03/2014

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Go beyond the application Get to know the platform and how to interact with it

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Android iOS

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Android iOS

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Embrace the platform design language Guidelines are a first step, a kickstart

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Android iOS

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Android iOS

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Android iOS

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Design is a balance Getting the best out of a set of constraints

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Design is never done… Now Future ?

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Secret to good design is iteration

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Software release trains

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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TIME Train vN Train vN+1

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6 weeks release cycle

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Day to day

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Code

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Merge request Code

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Monitoring Merge request Code

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No kidding? Business as usual

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Monitoring Merge request Code

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Code Git best practices

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Git best practices Several subjects in parallel Code

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Code Git best practices Several subjects in parallel Backlog always full

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Code Git best practices Several subjects in parallel Backlog always full Defensive programming

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The backend is not your friend

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Monitoring Merge request Code

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Autonomy Merge request

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Merge request Autonomy Conventions over tools

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Autonomy Conventions over tools Save time for review Merge request

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Merge request Autonomy Conventions over tools Save time for review In depth

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Merge request Autonomy Conventions over tools Save time for review In depth QA

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One hour of review per day Keep the bugs out

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Monitoring Merge request Code

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Monitoring Crash monitoring

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Monitoring Crash monitoring Analytics

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Monitoring Crash monitoring Analytics Play Store

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Monitoring Crash monitoring Analytics Play Store Customer support

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With great autonomy comes great responsibility

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And great pride

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Disclaimer The architecture was created in 2013. There was no real popular solution for architecting your app back then. Choices would probably be diﬀerent today

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How to build your architecture?

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Use proven technologies & focus on features

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Must be understandable by new developers easily

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Design for scale but do not over-engineer it

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Adapt your architecture to your product (and your API)

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An account was mandatory

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AccountAuthenticator

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Users use the app while travelling in a train

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Oﬀline by default

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Use case search & book a ticket

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Operations 100% online

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Operations 100% online • quick

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Data is valid for short period of time

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API call directly from the screen

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Use case after-sales

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Operations 100% online

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Operations 100% online • maybe minute(s)

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We need to keep operation’s state

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Live with your architecture

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Libraries must be carefully chosen

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Tech debts It impacts your

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Tech debts It impacts your • Productivity

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Tech debts It impacts your • Productivity • APK size

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How do we select one?

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How do we select one? 1. Maintained

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How do we select one? 2. Simple & focused

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How do we select one? 3. Not a core part

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How do we select one? 4. Documented

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in that order.

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How do we maintain them? Part of our release cycle

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How do we maintain them? Test their integration

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Thank you! @cyrilmottier @JeremMartinez

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Thank you! @cyrilmottier @JeremMartinez @Mathieu_Calba