Senior Web Application Engineer | Operating Japan's largest service 'Mitsumore' and the only Vertical SaaS 'ProOne' in Japan | Development environment with multiple CTOs!

＜Background＞ In addition to "Mitsumore," our core business since our founding, we have launched the Vertical SaaS "ProOne," expanding our business portfolio. While Mitsumore has achieved business growth by emphasizing product UX and valuing the initial touchpoints with users and customers since its inception, strengthening the development organization is essential for further evolution. Especially for ProOne, - Continuous development of new features - Modularization of fe...