Takahiro Mitsui portrait👋

Hello, I'm Takahiro. I'm a Full-stack developer with 4 years of experience. I thrive on creating web applications. My expertise lies in Python (FastAPI/Flask) and Typescript/JavaScript (Next.js/React/Node.js/NestJS).

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About Me

After completing my master's degree in molecular biology at Tokyo Medical and Dental University, I decided to follow my passion for coding and relocated to Germany. I enrolled at CODE University of Applied Sciences in Berlin, where I actively participated in three projects and secured two working student positions. After graduation, I joined Luup Systems GmbH as a full-time software developer, gaining hands-on experience in building scalable web applications. After my time at Luup, I moved back to Japan and joined airCloset Inc. as a Full-Stack Developer, where I currently lead and contribute to new projects. I'm particularly drawn to the problem-solving aspect of programming, finding immense satisfaction in overcoming challenges. My primary tech stack comprises FastAPI, Flask, Node.js, NestJs, Next.js, React and PostgreSQL with additional proficiency in TypeScript and Python. Eager to stay abreast of emerging technologies, I'm always on the lookout for opportunities to expand my skill set.

When I'm not coding, I indulge in bouldering and climbing to stay active and challenge myself physically.

My Experience

Full-stack Developer

airCloset Inc. - Tokyo, Japan

I am working as a Full-Stack Developer on the development of a rental fashion service. I also lead the launch of a new service as a lead engineer, determining the technical direction and guiding the team.

2025 - Present

Full-stack Developer

Luup Systems - Berlin, Germany

I worked as a Full-Stack Developer, building an AI-integrated web application for the EU Corporate Sustainability Reporting Directive (CSRD). I leveraged Angular, SolidJS, and gRPC to optimise performance and enhance the user experience.

2024

Graduated University

CODE University of Applied Sciences - Berlin, Germany

I graduated after 4 years of studying software engineering.

2024

Full-stack Developer

Face The Facts - Berlin, Germany

I worked as a full-stack developer on this open-source project for three years. It is a mobile app to show politician's information by scanning politicians' posters.

2021 - 2024

Backend Developer

Siemens Mobility - Berlin, Germany

I worked as a backend developer for 6 months. I developed GraphQL API from scratch using Flask and PostgreSQL. In this project, I implemented authentication and authorisation protocols with Microsoft Azure AD and integrated machine learning model on the backend server.

2023

Front-End Developer

Foundamental - Berlin, Germany

I worked as a front-end developer for 5 months. I developed an internal web application using Next.js, Typescript and integrated a GraphQL API with Apollo Server.

2022

My Projects

Face The Facts

I worked as a full-stack developer for three years. It is a mobile app to show politicians' information by scanning politicians' posters.

  • Python
  • FastAPI
  • PostgreSQL
  • Docker
  • AWS
  • Redis Pub/Sub
  • Typescript
  • React

Geospatial ML

I contributed to it as a machine learning engineer. Developed a convolutional neural network (U-Net) for Semantic Image Segmentation of satellite images.

  • Python
  • TensorFlow
  • Matplotlib
  • Jupyter
  • Google Colab
  • OpenCV

CRAC/Warhol

I contributed to it as both a DevOps and smart contract engineer. CRAC/Warhol project aims to revolutionise advertising on social media through NFT (Non-fungible Token) technology.

  • DigitalOcean
  • NGINX
  • PostgreSQL
  • Node.js

Rust DNA Converter

I created a DNA converter to convert a DNA sequence into an RNA sequence and to translate it into an amino acid sequence. All codes are written in Rust.

  • Rust

My Blog Posts

Technical articles and insights from my development journey.

Hashnode••3 min read

You Only Need 3 Commands to Build Custom React Components

Discover how to efficiently build custom React components with Claude MCP, Figma, and shadcn/ui to meet tight deadlines.

  • claude.ai
  • figma
  • React
  • shadcn/ui
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My Skills