About

Work Experience

• Software Engineer / AI Development Lead, 

  Feb, 2024 - Present

  Leading generative AI application development with focus on AI agents. Development lead for A-BOSS (AI Business Department Manager) serving 700+ users. Published 3 technical books in 2025. Contributing to AWS Japan Official Blog and providing training as KAGAI Learning Hub instructor.

  • Development lead for A-BOSS - AI agent for KDDI corporate sales, serving 700+ users with 10 hours/month efficiency gain per user

  • Built 議事録パックン (Minutes Pakkun) - comprehensive sales support tool with meeting transcription and proposal generation

  • Deployed かぐたん (Kagutan) - secure internal AI chatbot to 1,200 users across 4 companies with ~2,000 monthly requests

  • Co-authored 3 technical books: 'やさしいMCP入門', 'AIエージェント開発/運用入門', and 'KAG Tech Book Vol.1'

  • Featured in AWS Japan Official Blog for A-BOSS case study

  • Instructor at KAGAI Learning Hub for GenAI and AI agent training

  • Active speaker at technical conferences including NW-JAWS and Langfuse Night

  • Currently on parental leave (Sep 2025 - Apr 2026) while continuing technical activities

• SRE Engineer, 

  Sep, 2023 - Jan, 20244 months

  As an SRE Engineer, improved continuous development processes using AWS CDK, GitHub Actions, and Autify.

  • Built and improved CI/CD pipeline and infrastructure on AWS

  • Migrated services from EC2 to ECS/Fargate with Blue/Green deployment

  • Expanded automated testing using Autify and developed execution pipeline for QA efficiency

• Application Engineer / Development Manager, 

  Aug, 2018 - Aug, 20235 years 1 month

  Full-cycle engineer for Web-based event matching platform using AWS, Nest.js, and React with TypeScript. Development Manager for Product Infrastructure team.

  • Developed pseudo-live function for pre-recorded video live streaming

  • Built video distribution platform and API infrastructure for external collaboration

  • Developed public API platform and MA/SFA integration (Marketo/Salesforce connectors)

  • Created Data Clean Room with Snowflake and AWS

  • Led Product Infrastructure team mission formulation and execution

  • Accelerated CI/CD and maintained E2E tests for engineering team support

  • Introduced FaaS migration and Blue/Green deployment

• Tech Lead / Senior Engineer, 

  Apr, 2019 - Jul, 20212 years 4 months

  Tech Lead and AWS architect for Web-based and Native App chatbot services. Led team of 8-10 members with responsibilities spanning architecture, development, team management, and stakeholder negotiation.

  • First experience as tech lead

  • Architecture featured at AWS Summit Tokyo 2019

  • Managed 8-10 member team

  • Scrum development methodology

• Data Engineering Developer, 

  Oct, 2017 - Mar, 20191 year 6 months

  Developed data analysis infrastructure for chatbot conversation analysis. Implemented Data-lake architecture with serverless Lambda Python and Pandas.

  • Data-lake Architecture using AWS

  • Serverless with Lambda Python

  • Pandas data analysis

  • Scrum development

• Backend/DevOps Engineer, 

  Oct, 2016 - Sep, 20171 year

  Developed and operated Web-based chatbot services using AWS, Python, and Node.js. Architecture featured ECS with Docker, DynamoDB, Lambda, and S3.

  • First experience using AWS

  • First experience using Python and Node.js

  • Serverless architecture implementation

  • CI/CD with Drone and Pytest

  • Lectured at AWS Summit Tokyo 2019 company booth

  • Scrum development

• Project Manager, 

  Apr, 2017 - Sep, 20176 months

  Led analytics operation system development using Splunk and Hadoop (MapR) for internal log analysis.

  • Project management and team building

  • Big data handling with Splunk and Hadoop (MapR)

  • Internal log analytics operation system

• System Engineer / DevOps, 

  Apr, 2016 - Mar, 20171 year

  Developed and operated location-based services using on-premise servers. Built integrated monitoring system with Zabbix.

  • Location-based service development and operation

  • Integrated monitoring system with Zabbix and Expect automation

  • First professional engineering role

Projects Experience

• A-BOSS (AI Business Department Manager), KDDI Agile Development Center

  Jul, 2024 - Present

  Production AI agent serving as a virtual department manager for KDDI corporate sales. Provides executive-level expertise for proposal reviews and strategic guidance. Features faithful replication of real executive's thinking patterns, personality, and speaking style (including Kansai dialect). Built on Amazon Bedrock with Agentic Workflow using ReAct pattern.

  • Serving 700+ KDDI corporate sales staff in production

  • Achieves 10 hours/month efficiency gain per user

  • Reduced proposal creation time by up to 1 hour

  • Contributes to KDDI-BX initiative (46,939 hours/year saved company-wide)

  • Featured in AWS Japan Official Blog and multiple media outlets (Nikkei, Business Insider Japan)

  • Multi-modal analysis including PowerPoint documents

  • Automatic user feedback summarization and reflection

  • RAG with internal knowledge base

  • LLMOps with Langfuse for observability

• 議事録パックン (Minutes Pakkun), KDDI Agile Development Center

  Sep, 2024 - Present

  Comprehensive sales support tool covering the full cycle: meeting transcription → proposal creation → knowledge sharing. Automatically generates meeting minutes from audio/video, creates proposal drafts, searches internal product information, generates competitor comparison tables, and creates daily/weekly reports.

  • Saves up to 1 hour per meeting

  • End-to-end sales activity support

  • Multi-modal input (audio/video)

  • Automated proposal generation

  • Internal knowledge base integration

  • Competitor analysis automation

• midi-mcp-server, Personal OSS

  Apr, 2025 - Present

  Model Context Protocol server for MIDI generation. Enables AI agents to create MIDI files programmatically through standardized protocol interface.

  • 16 stars on GitHub

  • Early contribution to MCP ecosystem

  • TypeScript implementation

  • Integration with midi-writer-js

• langfuse-v3-terraform, Personal OSS

  Dec, 2024 - Present

  Terraform module for deploying Langfuse v3 on AWS. Enables cost-effective LLMOps infrastructure setup with best practices.

  • Production-ready Terraform module

  • Cost-optimized AWS deployment

  • Comprehensive blog posts on operation

  • Community contributions to Langfuse ecosystem

• The Chatbot Service for Customer Support (Web), KDDI Corporation

  Mar, 2016 - Sep, 20182 years 6 months

  Hybrid architecture chatbot combining AI and human operators for telecommunications customer support. Achieved high FAQ response rate using Elasticsearch as search engine.

  • Hybrid architecture with chatbot and human operators

  • Elasticsearch-based FAQ search engine

  • Labor saving and improved customer satisfaction

  • Roles: Primary Developer, Data Scientist, Scrum Master

• The Chatbot Service for Customer Support (Native Apps), KDDI Corporation

  Oct, 2018 - Mar, 20223 years 6 months

  Enhanced chatbot service for Android and iOS customer support apps. Microarchitecture using Node.js for BFF with WebSocket, Python for backend. Architecture featured at AWS Summit Tokyo 2019.

  • Native app chatbot for Android and iOS

  • WebSocket-based real-time communication

  • Microarchitecture with Docker containers

  • Featured at AWS Summit Tokyo 2019

Skills

Education

Certificates

Awards

Volunteer Work

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