cv

Resume, education, research, and experience.

Basics

Name Haruki Yajima
Label B.S. Student in Information and Communication Engineering
Email yajima.code@gmail.com
Url https://haruk1y.github.io/
Summary B.S. student at The University of Tokyo working on machine learning systems, model efficiency, and trustworthy AI.

Work

  • 2025.04 - Present

    Tokyo, Japan

    Undergraduate Researcher
    Matsui Laboratory, The University of Tokyo
    Proposed a prediction-preserving pruning method for decision-tree ensembles.
    • Evaluated on 12 public tabular benchmarks.
    • Achieved up to around 30 percent higher compression than baseline pruning methods while preserving predictions.
  • 2024.11 - Present

    Tokyo, Japan

    Research Engineer Intern
    MinD in a Device
    Built reproducible benchmarking infrastructure for 3D reconstruction and SLAM models.
    • Standardized data and evaluation pipelines across multiple scenes.
    • Benchmarked runtime, memory usage, and geometric accuracy against LiDAR references.
    • Developed reusable experiment workflows with Weights and Biases.
  • 2024.09 - 2024.09

    Tokyo, Japan

    Software Engineer Intern
    freee K.K.
    Contributed to IAM services for authentication and authorization.
    • Conducted API feasibility analysis to improve login experience.
    • Designed and prototyped a passkey-based authentication flow.
    • Submitted pull requests to improve internal design system components.
  • 2024.08 - 2024.08

    Remote

    Web Development Intern (One-Week Summer Short Internship 2024)
    Rakuten
    Participated in a one-week Summer Short Internship 2024 online program.
    • Worked with other interns to develop a web app for disaster prevention.
    • Mainly handled backend processing using Python.

Education

  • 2026.04 - 2028.03

    Tokyo, Japan

    M.S. (Expected March 2028)
    The University of Tokyo
    Information and Communication Engineering
  • 2022.04 - 2026.03

    Tokyo, Japan

    B.S. (Expected March 2026)
    The University of Tokyo
    Information and Communication Engineering
    • Algorithm
    • Computer Architecture
    • Computer Networks
    • Distributed Systems
    • Information Security
    • Operating Systems
    • Programming Languages
    • Statistical Machine Learning
    • Theory of Computing

Skills

Languages
Python (primary)
C
C++
ML
PyTorch
Transformers
Systems and Tools
Linux
Git
Docker
Weights and Biases

Languages

Japanese
Native speaker
English
TOEFL iBT 96/120

Interests

Research Interests
Model compression
3D vision
Video AI safety
Distributed systems

Projects

  • - Present
    LabSpeak
    Dockerized full-stack application (Next.js, FastAPI, Postgres) for research-lab conversation practice.
    • Integrated LLM-based dialogue generation with streaming responses via Server-Sent Events.
    • Implemented real-time STT and TTS interaction for voice-based practice.
    • Designed a provider-agnostic interface for OpenAI-compatible APIs.
  • - Present
    PrompDojo (Gemini 3 Tokyo Hackathon)
    Real-time multiplayer prompt quiz powered by Gemini.
    • Awarded 3rd place out of 70 teams at Gemini 3 Tokyo Hackathon.
    • Built with Next.js, TypeScript, Firebase, and Gemini API.
    • Implemented realtime room flow, round progression, and scoring UX.