About Heitor Hirose

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

Aug 2026 ~ Sep 2026

CyberAgent, Inc. - Backend Engineer Intern

Led team interviews to identify internal knowledge needs and define the direction of Knowledge Catalog
Designed and developed a foundation for providing internal knowledge to AI agents
Built a system to organize knowledge such as specifications and meeting notes
Developed and evaluated an LLM-powered knowledge search and integration prototype

CyberAgent - Building a foundation for providing internal knowledge to AI agents with Knowledge Catalog

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

Sansan Tech Blog - Building a Bill One analytics agent during my internship

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.)

CyberAgent - Internship report on selecting and building an LLM Ops/Observability stack with Langfuse

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

Zenn - How I grew through a two-week Go College program by CyberAgent

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

Zenn - My experience joining YUMEMI's 1-Day internship

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

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.jsTypeScriptGoTypeSpec

More projects will be added soon...

Heitor Hirose

About

Career

CyberAgent, Inc. - Backend Engineer Intern

Mercari, Inc. - Data Engineer Intern

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

Sansan, Inc. - Data Engineer Intern

CyberAgent, Inc. - Backend Engineer Intern

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

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

Unicode, Inc. - Backend Engineer (Contract)

doot, Inc. - Full-Stack Engineer Intern

Interests

Works

Tokyo University of Technology - School Bus Timetable

Latest Articles

About

Career

CyberAgent, Inc. - Backend Engineer Intern

Mercari, Inc. - Data Engineer Intern

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

Sansan, Inc. - Data Engineer Intern

CyberAgent, Inc. - Backend Engineer Intern

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

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

Unicode, Inc. - Backend Engineer (Contract)

doot, Inc. - Full-Stack Engineer Intern

Interests

Works

Tokyo University of Technology - School Bus Timetable

Latest Articles

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