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Heitor Hirose

Student Engineer

About

Undergraduate student in the Department of Computer Science, School of Computer Science, Tokyo University of Technology.

Born in Nishio, Aichi, I started joining startup projects and contract development work while still in high school. Since then, I have worked across both backend and frontend development, mainly using Python and TypeScript for API development, UI improvements, and external service integrations.

I am also deeply interested in designing and operating Snowflake-based analytics platforms and data pipelines. Looking ahead, I aim to grow as either a data engineer or a full-stack engineer. My core mindset as an engineer is to take on unfamiliar challenges and turn them into opportunities for growth.

Career

May 2026 ~ Aug 2026

Mercari, Inc. - Data Engineer Intern

  • Improved and added new features to the internal product "Socrates"
  • Built and standardized evaluation datasets and workflows for LLMOps
  • Enhanced semantic layers to improve data utilization accuracy with LLMs
  • Ran multiple PoCs on automated semantic layer construction and maintenance using AI agents

Aug 2024 ~ May 2026

AIdeaLab, Inc. - Full-Stack Engineer (Contract)

  • Developed new features, improved UI, and fixed bugs using TypeScript (Next.js), Go, and Python
  • Improved RAG performance and built workflows with LangChain
  • Handled requirement definition, architecture design, and implementation for client projects

Feb 2026 ~ Mar 2026

Sansan, Inc. - Data Engineer Intern

  • Designed and developed an analytics support AI agent on top of the Bill One data platform
  • Modeled data with dbt and enabled analysis workflows using BigQuery datasets
  • Built analytics workflows by combining internal model knowledge management with AI agents

Aug 2025 ~ Sep 2025

CyberAgent, Inc. - Backend Engineer Intern

  • Joined development of "AI POS," an LLM-powered product, in the AI Business Division
  • Led technical selection and architecture design of an LLM observability stack (Langfuse), then deployed it on GKE
  • Designed a log collection architecture with OpenTelemetry Collector and implemented it with Cloud Run sidecars
  • Built an integrated monitoring platform compatible with multiple LLM frameworks (SmolAgents, LangGraph, etc.)

Feb 2025 ~ Mar 2025

CyberAgent, Inc. (Go College) - Short-Term Internship

  • Intensive training on Go fundamentals, web development, DB/Redis, testing, and performance
  • Introduced Clean Architecture in advanced assignments and built observability with OpenTelemetry, pprof, and SigNoz
  • Deepened understanding of code quality and performance optimization

May 2024 ~ May 2024

YUMEMI Inc. (1-Day Internship) - Workshop Participant

  • Worked in a group on API and database design based on requirements
  • Learned practical team design processes including discussion, role allocation, and checklist operation
  • Strengthened skills in quickly organizing requirements and producing design documents

Sep 2023 ~ Aug 2024

Unicode, Inc. - Backend Engineer (Contract)

  • Designed and implemented an integration with shipping carrier APIs (ShipOne)
  • Handled UI improvements and debugging support
  • Built backend logic to absorb specification differences across multiple external APIs

May 2021 ~ Jun 2022

doot, Inc. - Full-Stack Engineer Intern

  • Developed and operated an X (formerly Twitter) crawler
  • Improved UI based on user feedback
  • Implemented new backend API features and fixed bugs

Interests

Works

Tokyo University of Technology - School Bus Timetable

GitHub

An unofficial web app that provides school bus timetables for Tokyo University of Technology, originally built at a hackathon. We are developing it to support students and staff in their daily campus life. (In development)

Next.js TypeScript Go TypeSpec

More projects will be added soon...

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