Experience

Participated in the development team redesigning Oikura's architecture — a second-hand goods trading platform in Japan — from monolithic to microservices to optimize performance.

• Applied NX Monorepo, established clear boundaries between internal and public services
• Developed NestJS microservices following SOLID principles, optimized MySQL queries
• Contributed to building automated CI/CD pipelines on AWS (EC2 + CodePipeline)
• Integrated notification systems (SendGrid, SMS) through event-driven architecture with SQS & Lambda

Contributed to developing an automated voicebot system for information collection at takakuureru.com service, using AWS services.

• Designed state machine and conversation flow for automated data collection
• Integrated Bedrock Claude Haiku for intent classification and structured data extraction
• Handled real-world voice communication issues: dead air, brand recognition errors, PostCode formatting
• Set up protection mechanisms (rate limit, interaction limits) to protect the system

Designed and deployed an automated pipeline for transcription, summarization, and data extraction from IS/FS business calls.

• Built end-to-end processing flow: STT → Diarization → Summarization → Structured Extraction
• Used SageMaker async endpoints and Lambda workers to optimize cost and latency
• Fine-tuned for improved accuracy on real-world audio data (background noise, cross-talk)
• Stored and exported data via S3 Tables and Google Sheets for operations team

Experimented and deployed a multi-agent system to support and partially automate IS/FS staff workflows.

• Designed multi-agent workflow using LangGraph and Gemini
• Applied Agent-to-Agent (A2A) communication standards to synchronize data between Voicebot and decision-making system
• Optimized memory and caching mechanisms for agents
• Flexibly integrated with existing infrastructure (S3, DynamoDB)

Participated in developing an event-driven customer communication management system for internal operations.

• Used AWS SAM, Lambda, and EventBridge for data synchronization and task scheduling
• Built backend workflow with NestJS and MongoDB database
• Created ReactJS interface for operations staff, integrated real-time webhooks (SMS, Gmail, Slack, Line)

Researched and developed a chatbot tool to support retrieval and analysis of internal technical documents.

• Improved search result accuracy using Word2Vec embeddings
• Deployed LLM model (Ollama) on internal network for information security
• Designed modular pipeline, easy to extend and optimize response time

Participated in maintenance and feature development for an application connecting dental clinics in the French market.

• Full-stack development with NestJS, Vue.js, and Vuetify
• Improved UI/UX and fixed bugs based on real user feedback
• Developed communication and asynchronous collaboration skills with European team

Contributed to developing a SaaS platform for creating and sharing interactive 3D assembly instructions.

• Integrated 3D display on web to replace manual 2D documents
• Converted Figma designs to actual interfaces and built backend APIs
• Combined Three.js, Strapi, and NestJS in Docker environment

Participated in building interfaces for a cryptocurrency market learning and news platform.

• Connected APIs to display on-chain data and supported technical documentation
• Optimized user experience (UI/UX) across multiple devices
• Developed learning progress tracking modules for e-learning platform