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Projects
One of the most common challenges in IT project management and cross-departmental/company coordination is management inefficiencies caused by inaccurate technical and requirement estimations.
To address this, I have deliberately taken on diverse roles to broaden my expertise and minimize technical blind spots. Additionally, as a team member, I leverage my development experience to fill technical gaps and ensure project success.
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Line Yahoo (LY Group), Japan's largest internet company with flagship products including Line (covering 71% population) and PayPay (66% market share), initiated this strategic migration from on-premise Teradata to AWS Redshift to handle data growth and reduce operational costs.
- Cross-division coordination: Orchestrated resources across business units, completing architecture assessment and migration scheduling
- Technical research: Conducted comprehensive analysis of Teradata-Redshift differences, establishing phased migration strategy
- Resource evaluation: Assessed hardware, manpower and timeline requirements for optimal resource allocation
- Standardization: Developed SOP through pilot migration and iterative refinement
- Data consistency: Designed validation standards and automated verification framework with continuous optimization
- Progress monitoring: Real-time tracking and issue resolution throughout migration execution
As technical lead for Japan's top-tier payment platform, managed server-side feature iterations and maintenance.
- Organized integration meetings with external systems (credit cards/banks), ensuring seamless feature integration
- Implemented Agile project management via Jira, improving task allocation and issue tracking
- Established code review protocols to enhance code quality and maintainability
- Reviewed API documentation and test cases (UT/IT/PT)
- Developed new payment modules and coordinated server-mobile integrations
This telecom analytics project processed mobile base station and GPS data to track and predict mobility patterns across Japan's 120M population, including location distribution and transportation modes.
- Led cloud platform selection (Databricks), ensuring smooth migration of legacy systems
- Developed anomaly detection and visualization tools for spatial data analysis
- Implemented data isolation and anonymization to meet strict compliance requirements
Independently developed an intelligent travel planning app generating personalized itineraries with navigation, transit routes and schedules based on user inputs.
- Full-cycle development from market research to launch
- Designed intuitive UI/UX using Figma
- Built iOS client with SwiftUI, integrating CloudKit and MapKit
- Developed proprietary multi-destination routing algorithm
- Created cross-platform admin system with React Native
- Implemented CI/CD pipeline with cloud infrastructure
A digital platform enabling construction workers to report safety issues via mobile app, incorporating real-time rewards to enhance safety culture (Agile development).
- Conducted technical feasibility studies and architectural design
- Managed cross-departmental coordination and issue resolution
- Solved React Native compatibility issues across iOS/Android versions
As core developer for this popular Japanese music creation app, handled architecture design and DevOps using Agile methodology.
- Developed RESTful APIs with UT/UI testing frameworks
- Optimized CI/CD pipeline, reducing 3,600+ UI tests from 4hr to 1hr
- Implemented Terraform-based IaC on AWS, reducing human errors
- Established monitoring system with rollback capabilities
- Built copyright management backend improving takedown efficiency
Developed automation solutions for Japan's national registry digitization, implementing OCR and error detection to handle massive data correction workloads.
- Translated business requirements into technical solutions
- Managed 120+ database tables across applications
- Designed document structuring system improving OCR accuracy from 65% to 85%
- Created human review interfaces for hybrid processing
- Coordinated SDK-level support with a Russian OCR SDK supplier for Japanese character recognition, ensuring smooth cross-border collaboration.
- Enforced strict data compliance policies
Developed microservices for the autonomous robot logistics network in Toyota's future smart city (2,000 residents), following Agile methodology.
- Designed scalable microservice architecture
- Defined data schemas and API specifications
- Implemented containerization with docker-compose
- Built REST/MQTT/RabbitMQ microservices with Spring Boot
- Developed Flask mock services for parallel testing
Conducted system testing for Pepper humanoid robot's management system and enterprise applications.
- Designed full-cycle test plans (UT/IT/functional)
- Led UAT ensuring release readiness
- Automated testing (Selenium) reducing effort by 87.5%
- Built AWS-based log analysis system
- Served as technical liaison with Aldebaran Robotics
- Managed 200+ issues via Redmine
Built data infrastructure for China's leading maternal social platform (3.4M DAU) to enable data-driven decisions.
- Implemented 3,400+ tracking points across platforms
- Developed ETL pipelines with SQL/Shell/Python/Scala
- Designed Hadoop warehouse supporting 300K→3.4M DAU growth
- Created real-time visualization dashboards
- Reduced anomaly response time by 80% via automated alerts
- Established ML-based user profiling (7.67% retention lift)
- Designed A/B testing framework for product iteration