Kenta Yamaguchi

Sample

Senior Engineering Manager at Wren Care | ex-Microsoft

Wren Care
Tokyo, Japan · JST (UTC+9)
8+ years experience
INSEAD Singapore
English, Japanese, Spanish
Hiring
Messaging unavailable

Overview

11 years in software engineering, the last 1 at Wren Care, where I lead the iOS team. Mentored 7 engineers through their first promotion. Shipped a rewrite that took build times from 42 minutes to under 3. Before that: Microsoft and Stripe. Most at home with UIKit and Swift. I tinker with 3D printers.

Good reasons to reach out
  • Candidates for the role I'm hiring for
  • Thoughtful intros to people in my field
  • Second opinions on SwiftUI decisions
Please don't message about
  • Agency or outsourcing pitches
  • Courses and coaching offers

Answers in batches on Fridays

Skills
Core DataUIKitSwiftUISwift
HiringHiring for a role
closes in 3 months

4 backend engineer roles open on the iOS team in Tokyo

Role
Backend engineer
Level
Senior
Type
Full-time
Work mode
Hybrid
Compensation
$132k-$189k + equity
Team
IOS, 13 people
Start
This quarter
Must have
Production experience with UIKit Production experience with Core Data Clear written communication
Process
3 conversations, no take-home

Comp S$129k-S$234k. We decide within ten days. Message me with one thing you shipped that you're proud of.

Tokyo, Japanuikitcore dataswift
Open

Experience

  1. Senior Engineering Manager
    Jan 2026 - Present
    Wren Care · 9 mo · Contract · Tokyo, Japan
    • Built the experimentation framework 34 product teams use to ship changes safely.
    • Took crash-free sessions from 98.5% to 99.6%.
    • Shipped 23 launches on the iOS team without a rollback.
  2. iOS Engineer
    Apr 2024 - Jan 2026
    Microsoft · 1 yr 9 mo · Full-time · Tokyo, Japan
    • Shipped 28 launches on the iOS team without a rollback.
    • Shipped a rewrite that took build times from 36 minutes to under 2.
  3. Senior iOS Engineer
    Jun 2022 - Apr 2024
    Stripe · 1 yr 10 mo · Contract · Tokyo, Japan
    • Took crash-free sessions from 98.9% to 99.8%.
  4. iOS Engineer
    Dec 2020 - Jun 2022
    Foxconn · 1 yr 6 mo · Full-time · Tokyo, Japan
    • Reduced cloud spend on iOS by 18% in two quarters.
    • Took crash-free sessions from 97.7% to 99.7%.
  5. Senior iOS Engineer
    Nov 2018 - Dec 2020
    Coupang · 2 yr 1 mo · Full-time · Tokyo, Japan
    • Brought on-call pages for iOS down from 25 a week to 2.
    • Rebuilt onboarding in SwiftUI and lifted day-one retention 11%.

References

No references yet.

Education

  1. INSEAD Singapore
    MBA, Business Administration
    2015 - 2017
  2. UNSW Sydney
    BEng, Electrical Engineering
    2011 - 2015

Details

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