Medium article for more information: https://medium.com/startbahn/startrail-and-startbahn-cert-c7a20e8b720fDeveloping a decentralized application (dApp) on Ethereum for managing histories of artworks and also its surrounding systems to make a healthy ecosystem for all types of participants for art.- Startrail ( https://startrail.io/ ): Registry of artworks on Ethereum blockchain. Each artwork is represented as NFT (ERC-721). Handlers of artworks such as galleries, museums, auction companies as well as artists can issue the token of an artwork they possess. Then, when an ownership of an artwork is transferred to someone else, its NFT gets transferred to next owner’s Ethereum address. They can also register other types of events of artworks such as exhibitions.- Startbahn Cert. ( https://cert.startbahn.io/ ): Working as an interface for Startrail. We provide not only the web interface but a NFC chip which can be attached to the physical artoworks.Tech Stack: Ethereum, Solidity, Graph, NestJS, Kotlin, Next.js, GKE, MySQL, etc.We are hiring! Please visit our open positions at LinkedIn or our website at https://startbahn.jp/en/recruit/ . We are based in Japan but mostly remote-based so we accept candidates from outside Japan too! Let’s make a healthy ecosystem for artworks or generally any creations by human beings.

Provided software engineering as well as technical consulting. The size of clients varied from startups with only a few members to large listed companies. The service varied much too. In a case, I coded its product from scratch. In another case, I architected the system, recruited an engineering team and reviewed their output.Tech Stack: Nuxt.js, NestJS, golang, Ethereum, GKE, ECS, Firebase, MySQL, etc

Provided SaaS for blockchain service providers.Tech Stack: golang, Python, NodeJS, ECS, GAE, etc

Provided payment applications "paymo biz" and "paymo" in Japan. They are kind of Japanese version of Shopify and Venmo, respectively.From 2017, we also started providing ICO and STO issuance platform along with its consulting services. We helped fundraising of companies in the U.S., India, etc and they raised over $70MM in total.Tech Stack: Kotlin(both Android and server), Swift, Ruby on Rails, golang, Vue.js, GKE, GAE, MySQL, etc

Founded the company which works with highly-skilled gamers closely and delivers their experiences to game companies as well as advertising agencies.Specifically providing play testing, SNS managements, operational support, etc.Developed and maintained all systems we build here such as chat bots, data analysis platform and websites. Completely full-stack from infrastructure, back-end to front-end.Decided and managed softwares we use for work (Google Apps, Slack, etc). Managed all of our employees along with my co-founder.LANG: Java, JavaScript(including Node.js), TypeScriptDB: MySQLPlatform: Google Cloud Platform(Google Compute Engine, Google App Engine, Google BigQuery, etc), Google Apps(Gmail, Google Spreadsheets, Google Drive, etc)

For social games on smartphones in Japan office.Developing for both server and client.LANG: Java, JavaScriptOS: Linux, Windows, Mac OS X, iOS, AndroidDB: MySQL, DynamoDB

Developed applications for Operations division, especially for Settlement Operations. Our clients are usually in overseas and colleagues are so diverse. For small-mid level projects, involved in project management as well.LANG: Java, C++, C#, PerlOS: Linux, WindowsDB: DB2, Sybase

Developed applications for Fixed Income divisionLANG: C++, PHP, Perl, Python, VBA