Hello, I'm

Susumu Tomita

Software Engineer

Building scalable systems and fostering engineering culture. From mission-critical enterprise systems to cutting-edge blockchain research, I bridge the gap between complex technology and practical solutions.

18+
Years in Tech
2,000+
Engineers Mentored
1M+
IoT Devices
80%+
Test Automation

What I Do

Cloud Architecture

Designing and operating AWS infrastructure for IoT services at scale. From 100K to 1M+ connected devices with high availability requirements.

Blockchain & Web3

Research and development in distributed systems. Currently working on ZeroKey (threshold cryptography) and JPKI-based Web3 infrastructure.

Engineering Culture

Founded Cloud Tech Friends (CCoE) with 2,000+ engineers across DENSO Group. Driving cloud adoption and knowledge sharing at enterprise scale.

Quality Engineering

Built test automation frameworks from scratch achieving 80%+ coverage for mission-critical systems used in banking ATMs and railway IC cards. QA experience in US and Japan.

Skills & Technologies

Blockchain & Web3

Solidity Ethereum Starknet Cairo Smart Contracts JPKI

Cloud & Infrastructure

AWS GCP Terraform Docker Kubernetes CI/CD

Backend Development

Python Go Node.js TypeScript REST APIs GraphQL

Frontend & UI

React Next.js Astro Tailwind CSS Solid.js

Quality Engineering

Test Automation CI/CD Testing Performance Testing Security Audit

AI & Automation

Claude Amazon Bedrock LangChain RAG Lab Automation

Experience

Current

2026.2 - Present

DENSO Corporation

Agile Coach

Contract

Supporting agile transformation and engineering culture improvement. Driving the "毎週工房" initiative for weekly product shipping culture.

2025.8 - Present

MynaWallet Inc.

Software Engineer

Web3 / Infrastructure

Infrastructure design and security audit for Web3 wallet using Japan's JPKI (Public Key Infrastructure).

Previous

Logomix Inc.

Software Engineer

2025.6 - 2026.4

Built fully automated iPS cell cultivation system. Integrated Hamilton STAR liquid handling robots with incubators and observation devices.

DENSO Corporation

Software Architect / Cloud Lead

2018.10 - 2025.12

First certified Cloud/IT Software Architect under DENSO's "Software Sommelier" program. Designed AWS infrastructure for IoT services managing 100K-1M devices. Founded Cloud Tech Friends (CCoE) community.

First Software Architect certification CCoE with 2,000+ engineers 1M+ connected devices

WHILL Inc.

Software Engineer

2021.9 - 2022.4

Developed cloud application for wheelchair sharing service at airports. Built real-time data pipeline using SORACOM and AWS.

Hitachi Vantara (US)

Specialist Software QA

2017.2 - 2018.8

QA experience in the United States. Test automation for Lumada IoT platform. Led proof-of-concept connecting Lumada with industrial printers.

US-based QA experience Lumada IoT Platform

Hitachi, Ltd.

QA Engineer / Technical Lead

2006.4 - 2017.1

Built test automation frameworks from scratch for JP1 Performance Management used in mission-critical systems (banking ATMs, railway IC cards). Principal QA at Hitachi Data Systems.

Test automation framework from scratch 80%+ test coverage Mission-critical systems QA

Certifications

DENSO Software Sommelier - Cloud/IT Software Architect (First Certified)
AWS Solutions Architect
Certified Scrum Master

Technical Writing

Zenn

Technical articles and tutorials in Japanese

Qiita

Technical articles on programming and development

Let's Connect

I'm always interested in new opportunities, collaborations, and interesting conversations about technology.

GitHub LinkedIn Contact Me