My Project History

2026-04-18

Summary

Over approximately 10 years of experience as an engineer, I have consistently handled the full development lifecycle — from requirements definition and design to implementation, operations, and sales.

As a Product Owner for in-house products, I have managed the entire lifecycle from market validation to release, continuously iterating based on user and customer feedback. In team development, I prioritize collaboration with both internal and external stakeholders, striving to balance expectation management with high-quality deliverables.

Currently developing an API Gateway as an open-source software (OSS) project in Rust.

Education

March 2010 — Graduated from high school (Tokyo, Japan)

Work Experience

April 2010 – March 2016 — Worked across real estate rental, sales agency, and private manipulative therapy clinic businesses.
April 2016 – August 2018 — SES company. Engaged in system development while stationed at client sites.
September 2018 – Present — Founded ALBY Co., Ltd. Representative Director & CEO. Providing system development services under quasi-delegation and fixed-price contracts.

Certifications

May 2016 — Oracle Certified Java Programmer, Silver SE 8 (1Z0-808)
December 2025 — Google Cloud Certified — Generative AI Leader

Project History

Functional Enhancement of Interview Matching Platform

Period: April 2024 – Present
Contract Type: Quasi-delegation (Professional Services)
Team Size: ~20 members
Role: Design, Frontend, Backend, DB schema additions
Stack: Next.js, NestJS, LIFF, Redis, PostgreSQL, Docker, Worker, GCP, Vercel

Sales Support Tool for SES Providers — In-house SaaS

Period: December 2023 – Present
Contract Type: In-house product development
Team Size: 1 – 5 members
Role: Market research & validation, user interviews, marketing, design, development, testing, operations, sales
Stack: Next.js, Supabase, Python (FastAPI), Celery, Rust (Axum), Redis, PostgreSQL, Docker, GCP, Vercel, Cloudflare, SendGrid, Elasticsearch
Product: SES-Boost — a SaaS where tenants simply forward emails to a designated address to automatically classify them, store them in a searchable database, and receive matching suggestions.

Key Achievements

Processed forwarded emails into structured data (Case vs. Requirement) with low latency.
Improved matching performance at scale by migrating hot paths from Python to Rust and introducing batch processing.
Refined UI/UX and reorganized features based on user interview insights.
Drove sales activities through partnerships with other companies.
Iteratively improved extraction and matching accuracy.

BtoB Auction Site Development (Project A)

Period: July 2024 – December 2024
Contract Type: Fixed-price contract
Team Size: 3 members
Role: Sales, requirements definition, design, development
Stack: Next.js, Supabase, Python (FastAPI), Vercel, Render

Key Achievements

Proposed a start-small approach during the sales phase and launched MVP validation together with the client and early users before moving to full-scale development.
Joined shipping operations to surface system improvement opportunities from a hands-on user perspective.
Delivered successfully while continuously aligning expectations with stakeholders.

BtoB Auction Site Development (Project B)

Period: July 2024 – December 2024
Contract Type: Fixed-price contract
Team Size: 3 members
Role: Sales, requirements definition, design, development
Stack: Next.js, Supabase, Python (FastAPI), Vercel, Render, Docker

Key Achievements

Proposed a start-small approach during the sales phase and launched MVP validation with the client and early users.
After the MVP release, participated in shipping operations to identify system improvement points from a user perspective.
Delivered successfully while continuously aligning expectations with stakeholders.

Frontend Replacement for a Cryptocurrency Exchange

Period: April 2023 – September 2023
Contract Type: Quasi-delegation
Team Size: 8 members
Role: Leader support, test design, QA team coordination, replacement implementation, testing, DevOps
Stack: Vue, AngularJS, Ruby on Rails, GitHub Actions, Jest, Playwright
Overview: Migration from AngularJS (end-of-life) to Vue. Required zero-error and zero-bug replacement for a financial trading service.

Key Achievements

Onboarded an additional member to the project.
Designed a test case set that captured behavior prior to replacement.
Established a coordination flow between the replacement team and the QA team.
Completed the replacement without delays or bugs.

Feature Development & Automated Testing for a Cryptocurrency Exchange

Period: April 2023 – September 2023
Contract Type: Quasi-delegation
Team Size: 5 members
Role: Frontend & backend implementation, automated test environment setup, design system construction
Stack: AngularJS, Ruby on Rails, GitHub Actions, Jest, Playwright, Redis, Sidekiq

Key Achievements

Defined and disseminated component design guidelines.
Designed common components as a Design System and published them as an npm package.
Built an automated testing environment using Jest and Playwright.
Released new service screens and features.

Video Content Platform for Hairdressers

Period: April 2023 – September 2023
Contract Type: Quasi-delegation
Team Size: 11 members
Role: Frontend, backend, vendor negotiation, employee training
Stack: Nuxt.js, Express.js, Redis, MySQL, Veritrans (payment), Postman (API testing), Docker

Key Achievements

Collaborated effectively across a multilingual, international development team.
Mentored junior engineers on the client side.
Led meetings with the payment gateway vendor and translated technical details for business stakeholders.

Development Support for a Rental Tenant SaaS

Period: January 2021 – February 2022
Contract Type: Quasi-delegation
Team Size: 8 members
Role: Frontend, backend, new system development
Stack: Nuxt.js, Ruby on Rails, Redis, PostgreSQL, Jest, Docker

Key Achievements

Reduced frontend build times to roughly 1/8 of the original through build pipeline improvements.
Successfully launched a new internal system.

Planning & Frontend Development for a HealthTech Service

Period: July 2018 – March 2020
Contract Type: Quasi-delegation
Team Size: 12 members
Role: Frontend, service planning
Stack: Vue.js, Ruby on Rails, Redis, Heroku, PostgreSQL, Docker, Zeplin

Key Achievements

Delivered rapid iteration cycles to support market validation.
Maintained flexibility as requirements evolved based on market feedback.
Facilitated close communication between stakeholders, designers, backend, and AI teams.

Signage Software for Ceremonial Venues

Period: July 2018 – March 2020
Contract Type: Fixed-price contract
Team Size: 5 members
Role: Sales, requirements definition, design, development, operations
Stack: Electron, PHP, Windows OS

Key Achievements

Eliminated expectation gaps through meticulous requirements definition.
Delivered a mobile-friendly UI usable by non-technical operators on-site.

Similar Research Paper Search Web Service

Period: July 2018 – March 2020
Contract Type: Freelance / contract
Team Size: 5 members
Role: Design, implementation
Stack: Vue, Python (scraping), Scala (Web API / Play 2 Framework), Elasticsearch
Overview: Built a research paper search engine on top of Elasticsearch. Collected data from public sources such as PubMed and Google Scholar, indexed it into Elasticsearch, and exposed a unified search experience. Implemented similarity search to suggest papers close to a user’s favorites.

Internal System for a Major Auction Service

Period: February 2017 – February 2018
Contract Type: Freelance / contract
Team Size: 5 members
Role: Design, implementation, development team lead
Stack: Vue, PHP, Apache Hadoop, Perl
Overview: Built Hadoop queries to extract users eligible for campaigns, along with a PHP system to execute those queries.

Key Achievements

Acquired and shared Hadoop knowledge with the development team.
Coordinated closely with the project leader and internal users.