# Koshi Motegi — Development Experience
## Python
Used for research data analysis and experiments, personal development \(web scraping\), competitive programming \(AtCoder\), coursework, and part-time work \(chatbot development and data management\). My strongest language.
Experience: 4 years
## TypeScript
Used for hackathons \(JPHACKS2024 and JPHACKS2025\), internships, and building this website.
Experience: 1 years
## JavaScript
Used for personal development \(Chrome extension development\) and part-time work \(chatbot development\).
Experience: 2 years
## C++
Used in coursework and competitive programming. Built a Puyo Puyo-like game in a course.
Experience: 2 years
## C\#
Used during an internship to develop an employee management system with OracleDB. I remember little of it now.
Experience: 1 years
## C
Used in coursework. I remember struggling with pointers.
Experience: 2 years
## Haskell
Used while studying functional programming. It is the language I can write least well but like most.
Experience: 1 years
## R
Used in coursework for data analysis.
Experience: 2 years
## HTML
Used for web application development.
Experience: 2 years
## Ruby
Used with Ruby on Rails during an internship. I wrote it with Cursor, so I am not very confident with it.
Experience: 1 years
## SQL
Used for database operations, including data handling with MySQL and OracleDB.
Experience: 2 years
## CSS
Used for web application development. It is not one of my strengths.
Experience: 2 years
## Arduino
Used in a PBL course to operate a four-wheeled vehicle.
Experience: 1 years
## React
Used in hackathons, internships, and part-time work. I have been writing it more often recently.
Experience: 1 years
## Next.js
Used for JPHACKS2025 and to build this website.
Experience: 1 years
## FastAPI
Used in a hackathon. I like it because it is easy to work with.
Experience: 1 years
## Ruby on Rails
Used in an internship, including the development of additional system features.
Experience: 1 years
## Docker
Used in coursework, hackathons, and research. I manage the development environment in my laboratory, so I can use it competently.
Experience: 2 years
## GitHub
Used in coursework, hackathons, and research for version control and team development.
Experience: 2 years
## AWS
Used for part-time work to develop and maintain a chatbot using S3, Lambda, and CloudWatch.
Experience: 1 years
## MySQL
Used in a hackathon.
Experience: 1 years
## OracleDB
Used in an internship to develop an employee management system with C\#.
Experience: 1 years
## SQLite
Used for personal development and coursework.
Experience: 1 years
## Git
Used as a version control system for all development projects.
Experience: 3 years
## Vercel
Used as a web application deployment platform, including for developing this website.
Experience: 1 years
## JPHACKS2025
A development project for the JPHACKS2025 hackathon, where the team developed a web application using Next.js.
October 2025
Frontend developer, Project Manager
TypeScript, HTML, Next.js, Git, GitHub
[GitHub](https://github.com/jphacks/ng_2511)
## Personal Portfolio Website Launch
Launched a personal portfolio website, building a modern site with Next.js and TypeScript.
October 2025
Independent developer
TypeScript, Next.js, Git, GitHub
[GitHub](https://github.com/CS-Kmkm/kmkm-page)
## SmartHR Internship
A hackathon-style frontend internship at SmartHR, Inc. Conducted frontend development using TypeScript and React, and experienced the full process from user interviews to feature development.
September 2025
Frontend developer
TypeScript, HTML, React, Git, GitHub
## Raksul Internship
A hackathon-style backend internship at Raksul Inc. Conducted backend development using Ruby on Rails, and experienced the full process from user interviews to feature development.
September 2025
Backend developer
Ruby, Ruby on Rails, Git, GitHub
## BIPROGY Internship
A one-week data scientist/AI engineer internship at BIPROGY Inc. Developed an AI-powered system in a four-person team.
August 2025
Data Scientist / AI Engineer
Python
## MonotaRO Internship
A one-week data scientist/AI engineer internship at MonotaRO Co., Ltd. Developed a system using generative AI.
August 2025
Data Scientist / AI Engineer
Python
## Generative AI Chatbot Development \(Part-time Work\)
A generative AI chatbot that answers questions about methods for managing research outputs \(research data\). A product intended to support people who manage research data. I took over development from a senior colleague and was responsible for fixing issues in web-search-based answer generation, migrating the vector database service \(Pinecone to AWS S3 Vector\), and adding data.
April 2025–Present
Sole developer and maintenance engineer
Python, JavaScript, HTML, React, AWS, Docker, Git, GitHub
## Gikusei Festival 2025 \[Spring\] \(In-person Attendance\)
Attended Gikusei Festival 2025 \[Spring\] in person. This event for technology students included visiting company booths and attending technical sessions.
March 2025
Participant
Event Participation
## JPHACKS2024
A development project for the JPHACKS2024 hackathon, where the team developed a web application.
October 26, 2024
Backend developer, Project Manager
Python, TypeScript, HTML, React, FastAPI, MySQL, SQL, Git, GitHub
[GitHub](https://github.com/jphacks/ng_2405)
## Chrome Extension Development \(Personal Development\)
Developed Chrome extensions using JavaScript to extend browser functionality and improve usability.
August 2023–April 2025
Independent developer
JavaScript, HTML, CSS
## Toyota Systems Internship \(Two Weeks\)
An internship at Toyota Systems Corporation involving system development with C\# and OracleDB.
August 2023
Developer
C\#, SQL, OracleDB
## PBL
Developed in a four-person team in PBL \(Project Based Learning\). Worked on driving a car with Arduino and handled requirements definition.
June–July 2023
Project Manager, Programmer
Arduino
## Data Analysis and Experiments \(Research\)
Conducting data analysis and experiments for research activities, including data analysis and visualization, text generation with LLMs, and training classification models.
April 2021–Present
Researcher
Python
## Web Scraping \(Personal Development\)
Developed web scraping tools using Python for automated data collection and analysis.
April 2021–Present
Independent developer
Python
## Competitive Programming \(AtCoder\)
Competitive programming activities on AtCoder, implementing algorithms and data structures in practical problems.
April 2021–Present
Competitive programmer
Python, C++