Initiatives to Quantify and Track Technical Issues in Mobile Apps

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https://youtu.be/UEBHkLnrOHQ https://www.slideshare.net/techblogyahoo/yjtc18-c2-web-87239068 Yahoo! JAPAN Tech Conference 2018 Yahoo! JAPAN Tech Conference 2021 Self-Introduction - Worked as a iOS app KURO-OBI (Black-belt) (2017-2020) - Presented at tech conferences in 2018 and 2021(Japanese) - iOS app developer in Yahoo! JAPAN

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Target audience - People who work with members of various occupations who do not communicate directly - People who want to eliminate technical debt systematically - People who can't grasp all the code and are developing apps with a large team

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Overview - Introducing the team's efforts to improve technology on the Yahoo JAPAN app for iOS - Introduction of what kind of points I keep in mind while continuing those efforts - If the organization is large, technical improvement will not scale due to individual motivation alone

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Yahoo! JAPAN for iOS (Photos: aflo)

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Project structure (2022)

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Related Talk Day 2 18:00 - 19:00 JST Operation and Quantitative Visualization of Kanban and XP on Yahoo! JAPAN Top Page

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Technical debt

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Technical debt - More and more ad hoc code - Old APIs and languages continue to be used - The code becomes complicated due to the hands of many people

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We need to eliminate technical debt… - Continuously - As a team

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Agenda - Case Study 1 : Multi-modularization - Case Study 2 : SwiftUI introduction - Patterning these approach

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Agenda - Case Study 1 : Multi-modularization - Case Study 2 : SwiftUI introduction - Patterning these approach

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monolithic project Multi-module project Framework Framework Framework .swift .swift .swift .swift .swift .swift .swift .swift .swift .swift .swift .swift

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Trivialize the value of technology

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Messages in the team - Modularization allows more time for development - The above is self-explanatory - Multi-modularization speeds up each build and test execution time

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Trivialize the value of technology - Benefits can be clearly communicated to non-developers - Reassure others by telling them that work is progressing - You can easily build a measurement system - You can motivate team members

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Decide what to measure take measurements

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Build In Logs/Build/ Measurement target

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Dev Server √∫≈

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Build Time Dashboard

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Average weekly build time

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Before Multi-module

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After Multi-modularization

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New iOS released

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5FSN %JTUSJCVUJPOPGUJNFTQFOUQFSCVJME 1FSDFOUBHFPGDPNQMFUJPOT XJUIJOTFD Average weekly build time After Multi-modularization New iOS released

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Trivialize the value of technology

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Agenda - Case Study 1 : Multi-modularization - Case Study 2 : SwiftUI introduction - Patterning these approach

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Turn my goals into benefits for our organization - Trivialize the value of technology - Make indicators measurable by date and time - Rephrase the benefits to what they are for another platform or designer

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https://note.com/designers_story/n/nbfbb73828616 (Japanese)

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https://techblog.yahoo.co.jp/entry/20191203785540/ (Japanese)

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iOS Android Web Design X X X

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Trivialize the value of technology - Evaluated by number of steps - Replace UIKit source code with SwiftUI one-by-one

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XIB SwiftUI

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Report UI component replacement Visualize how many steps have been reduced Explain that they contribute to development efficiency

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How many steps have been reduced? 60% reduced

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Agenda - Case Study 1 : Multi-modularization - Case Study 2 : SwiftUI introduction - Patterning these approach

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Trivialize the value of technology

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Trivialize the value of technology Decide What to mesure Explain that they contribute to development efficiency Take measurements

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https://speakerdeck.com/kazuhiro4949/da-qi-ye-falsezui-qian-xian-dekodowoshu-kisok-kerutameniyatutekitakoto (Japanese) What I've been doing to keep writing code at the forefront of large companies

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Thank you