Now shipping at PayPay — Tokyo

Teerawat Vanasapdamrong

Engineering Manager

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Almost twenty years shipping software — now an engineering manager with deep mobile roots, solid backend and web chops, and a habit of learning whatever the product needs.

Experience
~20y
in software
Scale
70M+
users at PayPay
Team
8–13
engineers led
Industries
6
fintech-heavy
Journey
TH → JP
Bangkok → Tokyo

Description

About this engineer

For nearly twenty years I've grown from hands-on engineer to engineering manager — leading teams that ship products people rely on. I started writing iOS apps in Bangkok in the Objective-C era, led a 13-person mobile team at one of Thailand's biggest banks, partnered with Toyota to deliver Toyota Wallet Philippines, and today I lead engineering at PayPay — the payment app in 70M+ pockets across Japan.

I'm an engineer-turned-manager who never stopped being an engineer. Strongest on mobile, solid on backend and web, and curious about everything else — AI-assisted workflows, platform tooling, and whatever my side projects demand next. My teams ship calmly, on schedule, with fewer surprises.

  • 01 People-first leadership

    Hiring, coaching, and growing engineers — backed by real technical depth, not just process.

  • 02 Delivery you can set a watch to

    Release trains, CI/CD, and AI-assisted automation. Predictable shipping is a feature.

  • 03 Mobile-strong, stack-curious

    Deepest on iOS and mobile architecture; comfortable across backend and web — and always learning through side projects.

What's new

Version history

A career shipped in releases — mostly fintech, always mobile.

v2026 (Tokyo) Current release 2024 — Present

Engineering Manager · PayPay

Tokyo, Japan · Fintech

  • Lead engineering initiatives across PayPay's mobile ecosystem — platform modernization, architecture, release engineering, and software quality for apps serving 70M+ users.
  • Drove engineering excellence that cut CI build time from 18 to 10 minutes and reduced CI infrastructure costs by ~US$500/month via GitHub Actions and AWS-hosted runners.
  • Served as interim technical lead on application modularization and modern Swift architecture; championed AI-assisted development workflows and internal automations with LLMs and n8n.
  • Partner with Product, Platform, and Engineering leadership on delivery vs. long-term platform investment; mentor engineers through hiring, coaching, and career development.
  1. v3.0

    Opn (Omise) — Engineering Manager

    Partnered with Toyota Motor Philippines and Toyota Motor Corporation (Japan) to deliver Toyota Wallet Philippines — leading an 8-person cross-functional team across iOS, Android, backend, and frontend from planning through production. Hiring (100+ candidates), OKRs, coaching, and delivery.

    Bangkok, Thailand · Fintech

    2021 — 2023
  2. v2.5

    Sirius Tech — Backend Lead · Solution Architect

    Led backend engineering and architecture for a high-frequency trading platform written in Go.

    Bangkok, Thailand · Fintech

    2021
  3. v2.0

    Siam Commercial Bank — iOS Developer · Release Manager

    Led a 13-person iOS and Android feature team on SCB Easy and owned mobile release management — redesigned the release workflow, built commit-convention automation and release notes tooling, migrated Swift 4→5, and ran Jenkins/Fastlane CI/CD.

    Bangkok, Thailand · Banking

    2018 — 2021
  4. v1.0

    11street · Getmii · Iwa Labs — iOS Lead · Full-stack Developer · Founder

    Shipped iOS apps and Ruby on Rails backends across e-commerce and startup products, and founded a small software business along the way.

    Bangkok, Thailand · E-commerce · Startups

    2010 — 2018
  5. v0.1

    Khon Kaen University — B.Sc. Computer Science

    Where it all compiled for the first time.

    Thailand · Education

    Public beta

Now shipping

Side projects

Built nights and weekends — mostly tools for learning Japanese, my other long-running project.

iOS · Android Featured

iroiro Japan

2026

Learn Japanese through graded news and spaced-repetition flashcards — read JLPT-level articles, save words, review daily. Live on the App Store and Google Play.

Swift / SwiftUI / JLPT

App Store Google Play
Web

iroirojapan.com

2026

The web home for iroiro Japan — graded Japanese news reading for learners, with a simple read-and-review flow.

Web / EdTech

Web

Kanji Flashcards

2026

Kanji flashcards and quizzes for JLPT N5–N1 — flip cards, track progress, stroke order, and meaning drills in the browser.

Web / JLPT

Web

Sekkei — System Design Trainer

2026

Interactive system design trainer — practice architecture and design decisions with guided scenarios (設計 sekkei).

Web / System Design

Information

Technical specifications

A little bit of everything, with mobile and iOS as home turf.

Leadership

Engineering management & delivery

  • Engineering Management
  • Hiring & Mentoring
  • OKRs & Roadmaps
  • Stakeholder Management
  • Agile / Scrum
  • Continuous Improvement

Mobile

Strongest technical foundation

  • iOS / Swift
  • SwiftUI / UIKit
  • Flutter
  • Modularization
  • Mobile Architecture
  • App Store Release

Backend & Web

Solid across the stack

  • Go
  • Ruby on Rails
  • REST APIs
  • Distributed Systems
  • Web

Platform & AI

Developer productivity & automation

  • CI/CD
  • GitHub Actions
  • Jenkins / Fastlane
  • Docker
  • AI-assisted Development
  • n8n / LLM automation
Provider
Teerawat Vanasapdamrong (@mrhangz)
Category
Engineering Leadership
Compatibility
Startups through enterprises — teams of 8 to 13
Languages
Thai · English · Japanese (learning)
First shipped
Bangkok, late 2000s
Current region
Tokyo, Japan
Age rating
~20Y — almost two decades in production
Price
Free to reach out

Get — free, no sign-in required

Let's ship something together.

Mobile engineering, leadership, or just a good gadget recommendation — I'd be glad to hear from you.

mrhangz@gmail.com LinkedIn GitHub

Based in Tokyo, Japan — open to conversations worldwide.