Rei Fujimoto
Sumida-ku,Tokyo
Summary
AI engineer with specialization in large language models, multimodal AI, and prompt engineering. Expertise in semantic search, model evaluation, and multi-model routing for production-grade systems. Proficient in Python, JavaScript, TypeScript, SQL, and shell scripting, with hands-on experience in PyTorch and API integration. Focused on developing scalable AI platforms that ensure high-quality user experiences.
Overview
10
10
years of professional experience
4
4
years of post-secondary education
Work history
AI engineer
Rakuten Group, Inc.
Tokyo, Tokyo
2022.04 - Current
- Streamlined operational workflows by developing intelligent automation scripts.
- Participated in regular technical reviews for continuous improvement of existing AI platforms.
- Tested prototypes rigorously, assuring quality before deployment in production environment.
- Improved business decision-making processes by integrating artificial intelligence solutions.
AI engineer
Preferred Networks, Inc.
Tokyo, Tokyo
2019.03 - 2022.03
- Evaluated performance metrics of AI systems regularly, ensuring optimal functionality at all times.
- Maintained high ethical standards whilst handling sensitive information during data processing tasks.
- Translated business requirements into technical specifications to deliver tailored AI solutions according to client needs.
- Improved business decision-making processes by integrating artificial intelligence solutions.
Machine learning engineer
Mercari, Inc.
Tokyo, Tokyo
2017.09 - 2019.02
- Created neural networks for efficient pattern recognition tasks.
- Collaborated cross-functionally, ensuring alignment on machine learning objectives.
- Identified valuable data sources and automated collection processes, leading to better informed decisions.
- Optimised image recognition software to improve user experience.
Junior software engineer
NTT Data Corporation
Tokyo, Tokyo
2016.04 - 2017.08
- Enhanced system performance by optimising existing software.
- Maintained version control discipline facilitating effective tracking and changes in source code.
- Produced clear documentation of all coding work aiding future maintenance and upgrades.
- Kept abreast of the latest industry trends, ensuring up-to-date knowledge on best practices.
Education
Bachelor of Science - Computer Science
University of Tokyo
Tokyo, Japan 2012.04 - 2016.03
Skills
- Large language models
- Multimodal AI
- Prompt engineering
- Semantic search
- Model evaluation
- Multi-model routing
- Structured output design
- Decision intelligence
- Inference optimization
- Real-time pipelines
- Python development
- JavaScript and TypeScript
- SQL databases
- Shell scripting
- PyTorch and Transformers
- API integration
- Speech and vision AI
- Vector databases
- REST API design
- Containerization and CI/CD
- Cloud services
- Caching systems
- Distributed systems
- Event-driven design
- Multi-tenant SaaS
- Performance optimization
Timeline
AI engineer
Rakuten Group, Inc.
2022.04 - Current
AI engineer
Preferred Networks, Inc.
2019.03 - 2022.03
Machine learning engineer
Mercari, Inc.
2017.09 - 2019.02
Junior software engineer
NTT Data Corporation
2016.04 - 2017.08
Bachelor of Science - Computer Science
University of Tokyo
2012.04 - 2016.03