MfS France - Trois choses que j'aurai aimé connaître pour mes équipes tech

Quand votre startup et votre équipe grossit, vous avez parfois le temps de voir vos erreurs grossir en même temps. Voyons ensemble trois domaines dans lesquels j'aurais aimé faire autrement pour mes équipes de dev.

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1. 3 technical things I wish I had known Christopher MANEU Startups Cloud Advocate @ Microsoft @cmaneu
2. @cmaneu I worked on a diverse range of « startups » Bootstraping Series E Intrapreneurship Startups Scale-ups A B C UX Designer DevOps Engineer Mobile Developer Engineering Lead
3. @cmaneu Metrics for a better product Help people get productive Focus on tech relevant for your business
4. @cmaneu Metrics for a better product
5. @cmaneu
6. @cmaneu The unexpected metric
7. @cmaneu
8. @cmaneu
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10. @cmaneu Porting this feature on Windows Phone Needs major rework of the Audio player – Can’t do it in a sprint Sprint 1: Genres selection + Artists swipe without music preview Sprint 2: Add Music Preview
11. @cmaneu Metrics behind this feature Number of artists swiped / user > The greater the number is, the better for recomendation Analytics embedded in the API (no work client-side) Reports were not available for platform=windowsphone
12. @cmaneu What happened? We knew we
13. @cmaneu Measure things early Not implementing the audio preview made the key metric for this feature grow by ~200% After 1 week of launch (post sprint 1), Windows Phone was outperforming ALL mobile platforms on that metric. https://aka.ms/fast/insights
15. +++++++++++++++++++++++ PAGE CREATED 'BootScreen' +++++++++++++++++++++++ BOOTSCREEN> START >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> [15:18:21] AppDataStore : OnApplicationLaunching - DiscoverActiveDownloads - Time elapsed (ms): 435 [15:18:21] AppDataStore : OnApplicationLaunching - UpdateCurrentTrackState - Time elapsed (ms): 2 [15:18:21] PlayLog : Deleting legacy playlog folder: SUCCEEDED [15:18:21] App : --------------------- DeezerApplicationState changed to 'MigrationDone' ---------------------- [15:18:21] App : DAVM Loading BOOTSCREEN> LoadApplication - Time elapsed (ms): 73 [15:18:21] App : DAVM Update current track state [15:18:22] App : DAVM Update PlayerActions Mixpanel> Sending event mobile_install A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\Data\Programs\{0AC0860A-B966-4004-817C-8AB50BD22511}\Install\Newtonsoft.Json.DLL'. Cannot find or open the PDB file. System.Windows.Data Error: BindingExpression path error: 'CanExecute' property not found on 'Deezer.UI.DelegateCommand' 'Deezer.UI.DelegateCommand' (HashCode=15035499). BindingExpression: Path='PlayCommand.CanExecute' DataItem='Deezer.DeezerAudioViewModel' (HashCode=1101770); target element is 'System.Windows.Controls.Button' (Name=''); target property is 'IsEnabled' (type 'System.Boolean').. System.Windows.Data Error: BindingExpression path error: 'CanExecute' property not found on 'Deezer.UI.DelegateCommand' 'Deezer.UI.DelegateCommand' (HashCode=9915935). BindingExpression: Path='PauseCommand.CanExecute' DataItem='Deezer.DeezerAudioViewModel' (HashCode=1101770); target element is 'System.Windows.Controls.Button' (Name=''); target property is 'IsEnabled' (type 'System.Boolean').. A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll SafeGetFile - File not found: parentFolder=Local, fileName=mixpanel.dat [15:18:22] App : DAVM Update playerstate Default [15:18:22] App : DAVM PropChanged IsInRadioMode [15:18:22] App : DAVM PropChanged IsInRadioMode [15:18:22] App : DAVM Update current track state [15:18:22] App : DAVM PropChanged IsInRadioMode [15:18:22] App : DAVM Update PlayerActions 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Runtime.Serialization.Primitives.ni.dll'. Cannot find or open the PDB file. System.Windows.Data Error: BindingExpression path error: 'CanExecute' property not found on 'Deezer.UI.DelegateCommand' 'Deezer.UI.DelegateCommand' (HashCode=15035499). BindingExpression: Path='PlayCommand.CanExecute' DataItem='Deezer.DeezerAudioViewModel' (HashCode=1101770); target element is 'System.Windows.Controls.Button' (Name=''); target property is 'IsEnabled' (type 'System.Boolean').. System.Windows.Data Error: BindingExpression path error: 'CanExecute' property not found on 'Deezer.UI.DelegateCommand' 'Deezer.UI.DelegateCommand' (HashCode=9915935). BindingExpression: Path='PauseCommand.CanExecute' DataItem='Deezer.DeezerAudioViewModel' (HashCode=1101770); target element is 'System.Windows.Controls.Button' (Name=''); target property is 'IsEnabled' (type 'System.Boolean').. [15:18:22] App : DAVM Update Shuffle repeat status 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Globalization.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Collections.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.IO.ni.dll'. Cannot find or open the PDB file. $$$$$$$$$$$$$$$$$$ HasAccessToDeezer> result=True, request took (ms): 1136 [15:18:22] DeezerRuntimeSettings : UpdateInternetAccess: [forced=False] before=True, after=True ROOT FRAME NAVIGATING (uri='/Login') BOOTSCREEN> ManageUnloggedUser - Time elapsed (ms): 1160 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Linq.ni.dll'. Cannot find or open the PDB file. BOOTSCREEN> END - Time elapsed (ms): 1252<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< +++++++++++++++++++++++ PAGE CREATED 'LoginPage' +++++++++++++++++++++++ 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Reflection.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\Data\Programs\{0AC0860A-B966-4004-817C-8AB50BD22511}\Install\microsoft.expression.drawing.DLL'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Runtime.Extensions.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Threading.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Dynamic.Runtime.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Linq.Expressions.ni.dll'. Cannot find or open the PDB file. [15:18:23] App : >>>>>>>>>>>>>>>>>>>>>>>>>> Resetting Navigation Stack (removeHome=True) <<<<<<<<<<<<<<<<<<<<<<<< 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.ServiceModel.Web.ni.dll'. Cannot find or open the PDB file. [15:18:23] DeezerDataProvider : MobileAuthenticate(buildId=WindowsPhone8, version=2.4.0.0, lang=us) 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Reflection.Extensions.ni.dll'. Cannot find or open the PDB file. [15:18:23] HttpDataClient : ExecuteQuery(uri=http://api.deezer.com/1.0/gateway.php?method=mobile.auth&api_key=4VCYIJUCDLOUELGD1V8WBVYBNVDYOXEWSLLZDONGBBDFVXTZJRXPR29JRLQFO6ZE&output=3&buildId=WindowsPhone8&version=2.4.0.0&operator=Fake GSM Network&lang=us, postData=) 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.ObjectModel.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Xml.XDocument.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\System.Text.RegularExpressions.ni.dll'. Cannot find or open the PDB file. 'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'Anonymously Hosted DynamicMethods Assembly'. [15:18:25] DeezerDataProvider : >>>>>>>>>>>>>>>>>>>>>>> DataServerUrl changed -> doing a mobile_auth on new server. [15:18:25] DeezerDataProvider : MobileAuthenticate(buildId=WindowsPhone8, version=2.4.0.0, lang=us) [15:18:25] HttpDataClient : ExecuteQuery(uri=https://api.deezer.com/1.0/gateway.php?method=mobile.auth&api_key=4VCYIJUCDLOUELGD1V8WBVYBNVDYOXEWSLLZDONGBBDFVXTZJRXPR29JRLQFO6ZE&output=3&buildId=WindowsPhone8&version=2.4.0.0&operator=Fake GSM Network&lang=us, postData=)
16. Our Definition of Done
17. Our Definition of Done
18. @cmaneu Measure things early https://aka.ms/fast/insights
19. @cmaneu Key metrics ideas • Think about the metrics at feature conception stage • Any team member should be able to query/build on top of these metrics
20. @cmaneu Focus on tech relevant for your business
21. @cmaneu Let’s build our own logging system We can build our own deployment engine Sure, I can build the push notification backend We’ll create our own HTTP client library
22. @cmaneu Which service you’ll not build yourself? • Exceptions Telemtry • Logging • Email gateway • SMS / Push notifications gateway • Payment processing • User management • CD/CI agents • DNS Servers • Search • Content moderation • Personalization (if not core business) • SSH Bastions • In-App Chat
23. @cmaneu Use existing tools, prepare for replacement public interface ITelemetryService : INotifyPropertyChanged { void SetUserId(string userId); void TrackPageView(string pageName); void TrackPageView(string pageName, IDictionary<string, string> parameters); void TrackException(Exception ex); void TrackException(Exception ex, string message); void TrackException(Exception ex, string message, bool isFatal); void TrackEvent(string eventName); void TrackEvent(string eventName, IDictionary<string, string> properties); void Trace(string message); void Trace(string format, params object[] arguments); void SendAllData(); } internal sealed class AppInsightsTelemetryService : ITelemetryService { public async void TrackException(Exception ex, string message, bool isFatal) { // For now, all data are not send in an ExceptionTelemetry // We send it also as a custom event Dictionary<string, string> properties = new Dictionary<string, string>(); properties.Add("a.env", _appConfiguration.Environment.ToString()); properties.Add("Type", ex.GetType().ToString()); properties.Add("Message", message); properties.Add("RawException", ex.ToString()); properties.Add("StackTrace", ex.StackTrace); ulong appMemoryUsage = MemoryManager.AppMemoryUsage / 1024 / 1024; ulong appMemoryUsageLimit = MemoryManager.AppMemoryUsageLimit / 1024 / 1024; properties.Add("d.memused", appMemoryUsage.ToString());
24. @cmaneu Use “off-the-shelf” APIs and services When a document is uploaded, categorize it If it’s a picture of someone, check quality If we already have a picture on another document, check if it’s the same person If it’s an official document, get specific fields values for the database When all documents have been uploaded, send a confirmation email
25. @cmaneu Use “off-the-shelf” APIs and services
26. @cmaneu Use “off-the-shelf” APIs and services
27. @cmaneu Use “off-the-shelf” APIs and services
28. @cmaneu Use “off-the-shelf” APIs and services
29. @cmaneu Interesting Azure Services for your Startup • User Management: Azure AD B2C • AI: Cognitive Services • Data Exploration: Azure Data Explorer • Data: Hosted MySQL, MariaDB, PostgreSQL, SQL Server, MongoDB (CosmosDB), … • Blockchain: Azure Blockchain Service & Workbench • Static websites: Azure Static Web Apps • Distributed config & secrets: App Configuration & Key Vault • Monitoring: Azure Monitor, Application Insights, … • Maps: Azure Maps, • And a lot more: App Service, API Management, Containers, DNS, CDN, ….
30. @cmaneu Sometimes, you may need to build things outside your business Permanent link to this comic: https://xkcd.com/1205/
31. @cmaneu Sometimes, you may need to build things outside your business
32. @cmaneu Sometimes, you may need to build things outside your business
33. @cmaneu Help people get productive
34. @cmaneu Companies are hiring devs faster than ever Companies are hiring more freelancers
35. @cmaneu Ask within your teams Todo new dev.txt setup-dev.sh
36. @cmaneu Start a shared notebook/wiki
37. @cmaneu Create a dedicated channel Everybody can ask (dumb) questions Everyone is invited to answer them If the answer is in a doc, point to the doc Pro-Tip check for answered questions Put them in a KB / in a chatbot !
38. @cmaneu Create a private shortlinker How can we print something ? Aka.ms/printing
39. @cmaneu What a dev needs to know? • Big picture • Collaboration • Code • Workflow • Security • Quality • Dependencies • First tasks • Monitoring • Code reviews • Troubleshooting guides • Sharing code • OSS policy • Moonlighting policy • Team schedule • …
40. @cmaneu Vive les patates !
41. @cmaneu Vive les patates !
42. @cmaneu Documentation – Engineering & product handbooks
43. @cmaneu Create a contributing.md • Coding conventions • Styleguides • Reporting bug/features • Definition of done • Testing • Pull requests rules • How to ask questions
44. @cmaneu Have some
45. //demo Commit code into production on your first day!
46. @cmaneu Use new hires to detect improvments • Via a « rapport d’étonnement » • Get newly hires to have a 10min presentation about an area of improvement they’ve seen in their first 90 days
47. Q&A Christopher MANEU Azure Engineer & Advocate @ Microsoft R&D @cmaneu
48. Thanks ! Christopher MANEU Startups Cloud Advocate @ Microsoft @cmaneu Aka.ms/chris/slides
49. Image credits Photo by William Warby on Unsplash Photo by Paul Skorupskas on Unsplash Photo by jesse orrico on Unsplash