Takeda Koki

iOS Application Developer

Koki Takeda has experience in iOS native app development, web frontend, backend, and infrastructure engineering. Born in Tokyo in 1996. Certified in Personal Information Protection for proper handling of personal data. Graduated from the Faculty of Media Sciences at Tokyo University of Technology, participated in Creative Application. After working as an infrastructure engineer and web backend/frontend developer, currently working on iOS native app development at Sansan, Inc. Focuses on writing code that is easy to discard and replace. Key projects include the Eight iOS app rewrite, Sansan iOS app development, and Mixch iOS app development. Personal project: omokake.

Expertise

iOS Native App Development（CoreMedia / CoreBluetooth / Metal）
Cross-platform Development（Kotlin Multiplatform）
Web Frontend Development（Angular）
Web Backend Development（Java / Python / Flask）
Infrastructure Engineering（Server Setup）
Legacy Code Refactoring
Architecture Design（VIPER / MVVM / MVP）

Follow

Works

April 2025 — Eight Business Card App iOS Dev Team

Rebuilding 13 years of complex code from scratch for the Eight business card management app

January 2024 — Sansan iOS App Dev Team

Sharing Android/iOS business logic using Kotlin Multiplatform

February 2023 — Mixch Live Streaming iOS Dev Team

iOS app development and refactoring for a live streaming service

omokake

A personal app built around the concept of connecting with many memories

Interests

Writing Skills for Scientists and Engineers and The Art of Readable Code are my bibles — books I always keep within reach while working.

I recently started The Ethics of Boredom. The World Does Not Exist and Philosophy of Learning are favorites I return to repeatedly.

I Heart Huckabees and Magnolia are films I keep coming back to.

App development, recording thoughts, making moss terrariums, and observing moss are things I find myself doing naturally.

Reading at coffee shops, browsing iOS app development, VR, and AR topics on Mastodon, browsing iOS app development, VR, and AR topics on Bluesky, and following iOS app development, VR, AR, Android, .NET, Linux, BSD, and NVIDIA topics in an RSS reader are things I naturally drift toward in my spare time.