Hi, I'M KOSEI

PROFILE

Kosei Ayabe

Hi, I'm Kosei — a software engineer currently based in Canada.
I was born in 1997 in Shizuoka, Japan, and studied computer science at university.
After graduation, I joined a major system integration company, where I worked as a systems engineer for about two and a half years.
In January 2023, I decided to take the leap and started my career as a freelancer.
Outside of work, I love traveling, saunas, reading books, and enjoying manga and anime.
I'm also into board sports like skateboarding, surfing, and snowboarding.
Recently, I've been studying English a lot.

SKILL

Application Development C# / .NET

5 years 90%

Application Design & Development

Experienced in application development using the .NET framework.
Capable of designing and building a wide range of systems including front-end, back-end, and API development.

Database Engineering Databases

5 years 90%

Database Design & Performance Optimization

Experienced in database design, performance optimization, query development, and server operations.
Capable of working with multiple database technologies including relational (RDB) and NoSQL systems.
Able to handle all aspects of database operations.

Front-End Development HTML / CSS

5 years 80%

Responsive Web Interface Development

Experienced in building responsive web interfaces and translating design into functional implementations.
Capable of scratch development for websites and landing pages, as well as modifying existing sites.

Full-Stack Web Development JavaScript / TypeScript

3 years 70%

Interactive Web Application Development

Experienced in web application development using JavaScript and TypeScript.
Capable of front-end feature development including API integration, data processing, and UI implementation.

AI-Assisted Development AI Tools

2 years 70%

Efficient Development with AI Tools

Experienced in leveraging a variety of AI tools and LLMs to enable fast and accurate development.
An early adopter and heavy user of AI technology, I stay up to date with the rapidly evolving landscape by continuously keeping an antenna up for the latest developments.

CMS Development WordPress / WooCommerce

3 years 90%

CMS & E-Commerce Development

Experienced in building and customizing websites using WordPress and WooCommerce.
Capable of developing custom plugins and integrating external services.

Cloud Infrastructure & Deployment AWS / Vercel / Cloudflare

2 years 60%

Cloud Deployment & Infrastructure Management

Experienced in deploying and operating applications in cloud environments using AWS, Vercel, Cloudflare, and other services.
Capable of evaluating appropriate tech stacks and infrastructure configurations based on system requirements, and handling everything from environment setup to operations.

Modern Web Frameworks React / Next.js

1 year 50%

Full-Stack Development

Experienced in building modern web applications using React and Next.js.
Capable of component-based UI development and server-side rendering.

Backend as a Service Supabase

1 year 50%

BaaS & Backend Integration

Experience building backend systems using Supabase, including authentication, database management, and API integration.

Design & Image Editing Adobe Photoshop

3 years 50%

Image Editing & Visual Design

Experienced in image editing, asset creation, and basic UI design support using Adobe Photoshop.

HISTORY

Let's explore my life!

1997

Born in Shizuoka

Born in a small town in Shizuoka prefecture Japan.
As a kid, I was always outside or playing video games. Got hooked on skateboarding in junior and senior high.
I played volleyball in school clubs.
Around that time, I started vaguely dreaming about running my own business someday.

2016

Entered IT Faculty

When I got my first iPod Touch in middle school, I was amazed by what technology could do.
As the internet, social media, and apps grew, I became interested in becoming an engineer.
Although I focused more on sports than school in high school, I studied hard for the entrance exams and got into my top-choice university.

2020

Graduated and Started Career

Graduated and joined a major system integration company as a new graduate.
Just as I started my career, COVID-19 hit and I began working fully remotely.
Over the next two and a half years, I moved around Japan—Chiba, Kumamoto, Hiroshima.

2022

Became a Freelancer

Having joined the company to build my professional experience, I left after about two and a half years.
I had always wanted to work in Tokyo, so I moved there after quitting and started out as a freelance engineer.
I realized that technical skills alone weren’t enough to stand out in the freelance world.
After a lot of thinking, I set my sights on learning English and working as an engineer abroad.

2024

Studied in Cebu

I studied English while working as a freelancer, but I wanted to improve more.
So I spent three months studying abroad in Cebu, Philippines.
I loved living overseas and making friends from different countries,
so I decided to go on a working holiday the following year.

2025

Working Holiday in Canada

North America is one of the world’s leading tech regions,
so I chose Canada to improve both my technical skills and English.
I moved to Vancouver in July 2025 and got a job as an engineer that December.
This was the start of the career abroad I had always dreamed.