- Provide technical guidance and mentorship to the engineering team to help achieve business goals with maximum efficiency and scalability.- Assist in the design and implementation of the web application, from infrastructure to front-end layers.- Mentor software engineers to improve their technical skills and contribute to the growth of the engineering team.

- As CTO at Junify, responsible for leading a team of software engineers in the design and implementation of SaaS applications.- Led the development of a web application using Ruby on Rails and TypeScript/React/AWS Lambda, which allows companies to manage their cloud applications and track employees' work times and locations.- Developed an iOS/Android app primarily using TypeScript/ReactNative, with native modules/extensions written in Java, Swift, and Objective-C.- Implemented a Chrome extension using TypeScript to interact with 3rd party cloud applications, including auto-filling credentials and providing 2FA codes.- Created an Electron app in TypeScript to synchronize user and group data between our app and Active Directory on Windows Server.- Designed and implemented workflows for engineering team collaboration using documentation, project management, and source code management tools.- Collaborated with customers to understand their needs and provide solutions to problems.

As CTO at Branding Engineer, an HR tech company that went public in Japan in 2020:- Developed a job matching service for software engineers in Japan from scratch (https://techstars.jp).-- Built a web app using Java and Play framework for the server-side, and JavaScript and React.js for the front-end.-- Implemented a search backend using ElasticSearch.- Developed an account management service for recruiting services for new grads from scratch (https://1katsu.jp).-- Built a crawler to aggregate jobs, company information, and recruiting event information from various recruiting sites, as well as an auto-fill registration bot that completes user signups on recruiting services.-- Built a web app using Java and Play framework for the server-side, and JavaScript and React.js for the front-end.- Set up development and production environments using Amazon Web Services.- Designed and implemented a workflow to ship new features for the products.- Led a team of 15+ people to build the new applications from scratch and add new features.

- Worked as a full time software engineer.- Mainly worked on back end of the company data pages.

indeed is the No.1 job site with traffic in the U.S., Canada, the U.K., and France.- Developed some parts of the front-end of company pages at Indeed.com (e.g. http://www.indeed.com/cmp/Indeed), and made a huge impact that increased the number of responses from mobile users.- Implemented the service in JSP, Java, Javascript and CSS.- Created provisioning environment for developers in the Tokyo office.- Worked in global environment.

- Researched and Developed computer vision API for Smartphone applications, which can detect and track an object in real time without any training data, utilizing machine learning techniques.- Implemented the API in C++ and OpenCV.- Worked in global environment.