- Developed the smart contracts on Polygon(Matic) and Ethereum based on game logic including farming and staking. - Designed the frontend of DApps with React JS which interacts with Ethereum and Polygon. - Designed the backend for DApps which should process the game events from smart contract and notify to frontend via websocket.

- Optimized MongoDB queries for the heavy‑load parts of the Node.js backend system, which improved website responsiveness and reduced the database costs by 20%. - Designed and developed the smart contracts using the Solidity and implemented test scripts for the smart contracts using the truffle framework.

- Forked and modified PIVX coin engine to make full private feature. - Implemented Ring signature and RingCT, BulletProof feature like as Monero coin. - Implemented StealthTransaction feature. - Fix bugs on Block explorer website which is built by React.js and node.js - Redesigned QT PC wallet App and implemented iOS mobile wallet App.

- Develops new and maintains existing websites by using Ruby on Rails, Postgresql, MongoDB. - Integration of front-end element created by front-end developers. - Performs technical analyses for development of new features. - Ensure that security and quality assurance best practices are followed throughout the entire software development life cycle