Itsuki Kajiya

Wrote clean, modular code with an emphasis on maintainability and future scalability.
Identified and resolved software issues through systematic testing and debugging, improving system reliability.
Worked on two technically challenging PoC projects with direct client involvement.

• Extended a C# canvas-based cursor rendering system to support stereoscopic (Side-by-Side) visualization of medical organ data captured by stereo cameras. This involved integrating Python, OpenCV, and Named Pipes for real-time disparity and depth processing. The solution was successfully delivered and monetized through client integration.
• Improved a YOLOv11-based object detection system for industrial use, focusing on performance tuning and user interface design. The system alerts workers when missing parts are detected in moving factory products. Upgraded the frontend using Streamlit for better usability and clarity.

One of the PoC projects remains in development due to the complexity of its implementation, requiring ongoing research and refinement.

Contributed to web development projects for major Japanese corporations, focusing on performance optimization, architecture design, and full-stack implementation.

• Participated in a portal system replacement project for a leading Japanese electric utility company, which serves over 3 million users. Technologies included Laravel, Blade, JavaScript, Ajax, CSS, PostgreSQL, and OracleDB.
  Investigated and resolved a severe performance issue in a contract registration page, where some users held over 1,300 contract records, leading to timeouts and Internal Server Error responses.
  Identified nested foreach loops using Laravel ORM and the lack of indexing as the root causes.
  Replaced ORM queries with raw SQL, simplified loop logic, and added proper indexing on PostgreSQL. These improvements reduced processing time from 6 minutes to under 1 minute.
• Led backend architecture and feature development for a royalty calculation system for a Japanese talent management agency.
  Built the system using TypeScript, Express (backend), Next.js (frontend), and PostgreSQL.
  Proposed a clear separation between the domain and infrastructure layers to distinguish core royalty logic from data access concerns. This architectural clarity helped accelerate delivery, completing the project in 3 months instead of the estimated 4.