RM

A decade and a half,
many hats.

Tokyo-based Engineering Manager · Born in Manila, Philippines

Wrote code. Held the pager for production systems. Built a company from zero to acquisition. Managed people. Same person, different chapters. Now back at the keyboard in the age of AI.

I write about what that feels like.

Integrity, consistency, trust.

Integrity means alignment — between what you say in the 1:1 and what you say in the all-staff, between the standard you hold your team to and the one you hold yourself to. People notice when those drift. And once they do, you've lost something hard to get back.

Consistency is how integrity becomes believable. Not the best version of you on a good day — the same version of you under pressure, in ambiguous situations, when it would be easier to look the other way.

Trust is the output of both — and the condition for everything else. People working from genuine investment, not fear, surface problems earlier, take smarter risks, and stay longer. You don't declare trust. You build it slowly, and you lose it fast.

Rakuten Pay

Rakuten Payment Inc.

Engineering group manager at Rakuten Pay, one of Japan's leading mobile payment platforms.

Rebuilding: this blog

Re-engaging with hands-on coding after years in management. Learning agentic workflows, modern stacks, and what it feels like to ship things again. Writing about the journey in real time.

2023–now

Engineering Manager

Rakuten Payment Inc. Japan 🇯🇵

Manager of Leaders. One of Japan's largest payment apps.

2021–2023

Engineering Manager

Manabie Japan, Philippines & Vietnam 🇯🇵 🇵🇭 🇻🇳

Edtech. Helped scale the engineering team across Japan and Southeast Asia.

2021–2022

Founder & CTO/CEO

AKARU LLC Japan / Philippines 🇯🇵 🇵🇭

Cross-border tech agency, ~40 people, zero attrition from founding to acquisition. Ran concurrently with Manabie.

2015–2021

Lead Engineer → Lead SRE

Quipper Philippines & Japan 🇵🇭 🇯🇵

Edtech. Built LMS and online video services, and handled production systems at scale.

2012–2015

Fullstack Engineer

Proudcloud Philippines 🇵🇭

Ruby on Rails, greenfield startup work from pre-seed to seed

What I love about engineering management mirrors what I loved about site reliability engineering: watching autonomous parts work together without a central coordinator. The craft is in building that, not in being the coordinator yourself. My output is my team's output — every hour I spend matters most when it multiplies someone else's work.

I've run performance cycles, written career frameworks, led calibration across several teams, and hired people in Manila, Jakarta, Tokyo, and Ho Chi Minh. The metric I track closest isn't velocity or delivery rate. It's how many people grew into something bigger and still reach out.

The Rebuild

I knew this was happening and I told myself it was fine. My time was needed elsewhere: strategy meetings, stakeholder alignments, roadmap reviews, writing promotion cases for yearly reviews, coaching a member through a difficult dynamic with a coworker. That's the job. I believed it, mostly. Code and design reviews became process conversations. My production commit history went quiet.

Then the agentic era arrived, and the distance between what managers understand and what engineers are actually doing started to feel like a liability. Decisions being made without enough context. I picked it back up.

I'm writing about the experience as it happens in the Rebuild section of this blog.

Primary

RubyGolangTypeScriptPythonKubernetesAWSGCP

Also

KotlinSwiftShell Rust — learning next

Interests

Machine learning · Data systems