Hara Yumi

Senior Blockchain & Cryptocurrency Engineer

  Tokyo, Japan

A highly focused Senior Blockchain & Cryptocurrency developer with 6 + years of experience in a variety of development projects.

Organised, methodical and a keen eye for detail results in solid coding and trustworthy programmes. Understanding client requirements and communicating the progress of projects are core values in achieving long-lasting business relationships. I provide cryptocurrency & blockchain solutions.

I am completely committed not only to providing basic services, but also to doing everything possible to get your business growing explosively. I will provide you with a great solution as per your expectations.

Don’t hesitate to contact me regardless of project complexity you need. My goal is that i want each of our customers to be completely satisfied.

My skills are as follow:

-Cryptocurrency & Blockchain
* Cryptocurrency Trading / Blockchain dApp / DeFi / NFT(Non Fungible Token) Marketplace
* Crypto Coins Exchange Development
* ICO & IDO Development with Created Token ( Coin )
* Token development based on Ethereum and Binance (ERC20, ERC721, ERC 1155, BEP20, BEP721, BEP1155)
* Bitcoin/PIVX fork(C++, QT)
* Smart Contract for erc/bep20, erc/bep721(Solidity for Ethereum&BSC, javascript for iost)
* Smart Contracts Audits
* Frontend Development for dApps, DeFis, NFTs
* Ethereum/ERC20/ERC721, Iost/IRC20/IRC21 and web3.js
* Cryptocurrency Wallet Development for Linux, windows, Mac, Web.

* React.js, Next.js
* Angular.js, Angular 2
* Vue.js, Nuxt.js

* PHP, Laravel, Codeigniter
* Node.js, Nest.js
* Java, Java SpringBoot

Thank you very much for viewing my profile.
Yours Sincerely

Best Regards


Work Experience

NFT game  •  Owebest

November 2020 - March 2021

Developing NFT games from scratch and launching it

Token Wallet  •  OpenColla

May 2019 - August 2019

Making a new token wallet including extension

NFT marketplace  •  AwaisChaudhry

September 2018 - October 2018

Launch NFT marketplace platform with frontend and backend

DeFi on TRON  •  CO.J,D

February 2017 - May 2017

Developing DeFi for TRON coin

dApp  •  Serhii L

July 2016 - September 2016

Developing dApp

Create/Deploy Smart Contract on Ethereum  •  Hardscape

March 2015 - April 2015

Create and Deploy a new smart contract on the ethereum network


The University of Tokyo

Software Engineering

2011 - 2015

Kaisei Academy

Software Engineering

2006 - 2011


  • Smart Contract
  • DApp
  • DeFi
  • NFT marketplace
  • NFT game
  • ERC Token
  • Wallet
  • Cryptocurrency Trading Bot
  • Crypto Exchange Field
  • web3.js
  • React.js
  • Next.js
  • AngularJS
  • Angular
  • Vue.js
  • Nuxt.js
  • PHP Frameworks
  • Node.js
  • NestJS


  • Japanese — Native or Bilingual
  • English — Professional
  • Chinese — Fluent
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