YASUNARI TANAKA

Led full-stack development of ShopCounter Enterprise, a SaaS platform connecting event vendors with venue spaces, as both Project Leader and Software Engineer in a 4-person team.

Key Responsibilities:

- Managed project planning and task allocation across the development team

- Led full-stack development using React and Ruby on Rails

- Made technical decisions on architecture and implementation approach

- Coordinated with Product Owner and QA teams to ensure quality of delivery

- Developed inquiry system enabling event vendors to contact multiple venue spaces simultaneously

Technologies:

TypeScript, React, Ruby on Rails

Achievement: - Successfully delivered features that contributed to securing new client contracts

Developed a web-based online English conversation service for an international client, handling all phases from requirements gathering to deployment.

Key Responsibilities:

- Led full-stack development as the sole engineer, managing requirements definition, implementation, testing, and operations

- Collaborated directly with the client through regular review sessions (1-2 times per Month) to align on scope and minimize rework

- Designed and implemented real-time features including chat functionality and live data synchronization using Firebase

- Built reusable Vue.js components to ensure maintainability and scalability

- Integrated Agora SDK for video call functionality to support live English lessons

Technologies:

TypeScript, JavaScript, Vue.js, Firebase (Realtime Database, Authentication, Hosting),

Achievements:

- Successfully launched the service within 5 months as planned

- Implemented serverless architecture using Firebase, reducing operational costs while maintaining high performance

- Delivered a cost-effective solution that enabled rapid business growth for the client

- Ensured smooth communication with the international client despite language and timezone differences

Led API integration project connecting Carely, which is health management platform, with third-party employee management services as Project Manager and Engineer in a 3-person team.

Key Responsibilities:

- Managed project timeline and resource allocation for 4-month integration project

- Led full-stack development using Ruby on Rails, TypeScript, and Vue.js

- Designed and implemented data transformation logic to normalize hierarchical structures between systems

- Created flexible mapping configuration to handle API field name discrepancies

- Utilized Kibera for API documentation to ensure alignment across teams and clients

- Coordinated closely with third-party development team during their parallel development phase

Technologies: Ruby on Rails, TypeScript, Vue.js

Achievements:

- Successfully delivered API integration enabling automated employee data synchronization

- Eliminated duplicate manual data entry across two systems, significantly improving operational efficiency

- Met tight deadline while maintaining code quality and system reliability