hakeohiratani

Wrote unique NFT marketplace contracts from scratch. Implemented reservation swap where users can buy listed items by paying first payment directly and pay second payment within duration by minting position token which reflects the reservation status. Implemented gas-less transaction for all the listings & offers & swap infos so can reduce the gas fee in the Ethereum network. Used merkle tree for verifying the signature with coming params.

Developed custom tokens on various chains with specific implementations to suit business needs. Integrated with decentralized and centralized exchanges (DEX/CEX) and bridges to enable seamless trading and liquidity provision for tokens. Implemented staking protocols and farming mechanisms that incentivize users for network participation and long-term investments. Launched successful token sales of projects on platforms like Pinksale, with compliance measures of proper documentation and regulatory requirements. Developed escrow system which quiz builders create the contest and set the prize token so users can play the quiz and winners get the prize tokens automatically. Developed battle royale games whose tokens are on the Ethereum network and real battles are on the Polygon network to reduce the gas fees and maintain the speed of games.

Developed and maintained a React and Next.js application dealing with multiple countries and languages. Provided TypeScript coaching for the rest of the team, code generation, and data models mapping with our CMS. Built from scratch admin platform for managing platform's database entities and users using React, Node.js, and Mongoose. Carried out +200 allocated issues & tasks while building profile web-based user interfaces and backend constructing. Wrote unit and end-to-end tests using Jest to ensure that the APIs were working as expected. Built fully automated CI/CD pipelines on CircleCI for containerized applications using Docker, Netlify, and AWS.

Designed custom PHP web applications using Laravel, MongoDB, CodeIgniter, LinkedIn, and OAuth. Converted an existing, conventional PHP-based web framework to support AJAX page loading. Participated in building and deploying a new eCommerce platform that integrates different systems, APIs and many others to support the logic of processing customer orders. Integrated a web-based file manager in a PHP custom site and helped to solve problems in it due to the usage of Java-based plugins. Supported making the CI/CD pipeline work properly with the codebase. Built a financial auditing system for Stripe payments using Laravel. Client payment reconciliation was performed between the application database and Stripe REST API.