#Rookie’s Adventure: A 0 to 1 Dev Journey

by LINE Developers Taiwan

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#Rookie’s Adventure: A 0 to 1 Dev Journey Dong Chen @iOS TECH FRESH 05/13/2025

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Dong Chen iOS TECH FRESH @LINE # Experience Tech Lead/ Full Stack Dev @OpenNCCU NLP Researcher @CSRone x NCCU 2024 Apple WWDC Swift Student Challenge Winner # Education Master/ Bachelor of MIS @NCCU

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01 02 03 04 # Unlocking LINE # From “What” to “Why” # More than just coding Shaping the requirements Developing like a LINER # All you need is stack overflow Breaking through the walls Diving into LINE 05 # Questions and answers Q&A CONTENT

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# Unlocking LINE 01 Diving into LINE

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A small team shipping huge products in a big company. LINE Client iOS Team

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A small team shipping huge products in a big company. LINE Client iOS Team

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Worldwide Developers Within One App So… what is my role? A little screw 􀤉

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# From “What” to “Why” 02 Shaping the requirements

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THINK ABOUT IT What’s happening after an feature has been requested?

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Inside a feature lifecycle. #1 Feature/ Idea received

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Inside a feature lifecycle. ea received #2 User research

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#3 Pre-design study Inside a feature lifecycle. er research

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esign study Inside a feature lifecycle. #4 Design

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#5 Pre-develop study Inside a feature lifecycle. #4 Design

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velop study Inside a feature lifecycle. #6 Develop

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Inside a feature lifecycle. #6 Develop #7 QA

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#8 Release Inside a feature lifecycle. #7 QA

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# More than just coding 03 Developing like a LINER

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THINK ABOUT IT What’s the most important things inside a dev cycle?

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THINK ABOUT IT What’s the most important things inside a dev cycle? Testability Maintainability

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How we enhance testability? - Take responsibility for the code you develop - Design for failure instead of fi xing bugs - Write tests - Learn from every lesson

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How we improve maintainability? - Step back to refactor and code review - Think fi rst, code second - ATDD/ Clean architecture - Deliver just the proper code with top-notch quality

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LINE CLIENT DEV Ship rapidly, refine constantly.

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How we keep productivity? - Set hard deadline to every task - Focus on quality over quantity - Integrate project management framework (Scrum/ WF) - Undertake every task with a clear purpose.

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# All you need is stack overflow 04 Breaking through the walls

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What are the walls? - Unexpected behavior with unknown root cause - System hardware limitations - Cross platform support - New technique keep rolling out and deprecated