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Hi, I'm Tetsuro Kawakubo, a full-stack engineer with over three years of experience building SaaS solutions on AWS. I specialize in Python/Django and TypeScript/React, and I've enjoyed leading projects from architecture design to deployment. I'm passionate about improving code quality and streamlining user experiences. I also like to build and operate personal projects, such as Diary Crab, an illustrated diary platform. When I'm not coding, I mentor interns and actively contribute to product management and business development discussions. I have a Bachelor of Science in Computer Science from Hosei University, where I researched AI-driven Instagram hashtag generation.…Hi, I'm Tetsuro Kawakubo, a full-stack engineer with over three years of experience building SaaS solutions on AWS. I specialize in Python/Django and TypeScript/React, and I've enjoyed leading projects from architecture design to deployment. I'm passionate about improving code quality and streamlining user experiences. I also like to build and operate personal projects, such as Diary Crab, an illustrated diary platform. When I'm not coding, I mentor interns and actively contribute to product management and business development discussions. I have a Bachelor of Science in Computer Science from Hosei University, where I researched AI-driven Instagram hashtag generation.

Tetsuro Kawakubo

Full Stack Developer, Developer, Programmer

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Hi, I'm Tetsuro Kawakubo, a full-stack engineer with over three years of experience building SaaS solutions on AWS. I specialize in Python/Django and TypeScript/React, and I've enjoyed leading projects from architecture design to deployment. I'm passionate about improving code quality and streamlining user experiences. I also like to build and operate personal projects, such as Diary Crab, an illustrated diary platform. When I'm not coding, I mentor interns and actively contribute to product management and business development discussions. I have a Bachelor of Science in Computer Science from Hosei University, where I researched AI-driven Instagram hashtag generation.…Hi, I'm Tetsuro Kawakubo, a full-stack engineer with over three years of experience building SaaS solutions on AWS. I specialize in Python/Django and TypeScript/React, and I've enjoyed leading projects from architecture design to deployment. I'm passionate about improving code quality and streamlining user experiences. I also like to build and operate personal projects, such as Diary Crab, an illustrated diary platform. When I'm not coding, I mentor interns and actively contribute to product management and business development discussions. I have a Bachelor of Science in Computer Science from Hosei University, where I researched AI-driven Instagram hashtag generation.

Available to hire

Hi, I’m Tetsuro Kawakubo, a full-stack engineer with over three years of experience building SaaS solutions on AWS. I specialize in Python/Django and TypeScript/React, and I’ve enjoyed leading projects from architecture design to deployment. I’m passionate about improving code quality and streamlining user experiences.

I also like to build and operate personal projects, such as Diary Crab, an illustrated diary platform. When I’m not coding, I mentor interns and actively contribute to product management and business development discussions. I have a Bachelor of Science in Computer Science from Hosei University, where I researched AI-driven Instagram hashtag generation.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Japanese

Fluent

English

Advanced

Work Experience

Solo Developer at Diary Crab

January 1, 2024 - Present

Designed, built, and currently operate an illustrated diary platform using Express, React, and Postgres. The platform has approximately 2400 users and around 250 daily active users.

Full-Stack Engineer at Logbii Inc.

July 1, 2023 - Present

Led technology selection and designed multi-tenant architecture and relational schema for a Talent Management System; implemented core features such as 1-on-1 and OKR/goal management using DRF and React. Built and deployed the TMS MVP on AWS (EC2 + ALB) within 3 months; integrated Slack notifications and Google Calendar via OAuth; secured two enterprise pilot customers within six weeks of launch. Redesigned high-volume API specifications to reduce oversized payloads, cutting average response times by up to 50%. Introduced code-review checklists and pair programming sessions, reducing post-release defects by approximately 30% and improving overall code quality.

Full-Stack Engineer at YOURNET Inc.

June 30, 2023 - July 16, 2025

Migrated legacy invoice-management system from server-rendered multiple page application (MPA) to single page application (SPA), modernizing UI/UX and streamlining billing workflows. Implemented an AI-powered chatbot using the OpenAI API.