Jiro Matsumoto

Full-stack Blockchain Engineer
3 Chome-40-6 Shiba, Minato City, Tokyo 105-0014, Japan
Japanese
Social networks
@codeninja819
@codeninja819
live:.cid.720bcfb6a8ee5608
Languages
English

Fluent

Japanese

Native

German

Elementary

Preferred skills
React, Node.js, Python, C# .NET, Solidity, MongoDB, Postgres
Preferred tools

  • VS Code

  • Windows / Ubuntu

  • Github

  • Slack
SKILLS & EXPERTISE
Programming Languages

Javascript, Typescript, Solidity, Rust, C++, Go, Move, SQL, PHP, Python, C#, GraphQL, HTML, CSS

Full-stack blockchain engineer with a passion for innovation and a track record of success. Let me help you take your company to the next level with my deep knowledge of data structures, consensus algorithms, and smart contracts. Don't miss out on the opportunity to work with a true blockchain expert - contact me today!
Education
Master of Information Science and Technology
From October 2013 to June 2015
Graduate School of Information Science and Technology, University of Tokyo
Bachelor of Science in Information Science
From April 2009 to September 2013
Faculty of Science, University of Tokyo
Work experience
Lead Full-stack Blockchain Developer
Since February 2023
Qitmeer Network UAE

  • Wrote several smart contracts and deployed on Qitmeer EVM Network.

  • Developed a couple of blockchain games using Unity Engine and Nethereum library.

  • Experienced in managing projects for the development of an NFT trading platform.

Full-stack Blockchain Developer
From September 2022 to January 2023
Mystra (formaly CapserArmy) Estonia

  • Developed smart contracts on the Casper network and built an NFT marketplace using the Casper JS SDK.

  • Created a bridge solution between different networks and the Casper network to enable seamless communication and transactions.

  • Developed a secure real-time chat application (React, Typescript) using WebSocket and RESTful APIs written C# .NET. Implemented private key encryption and public key signature to ensure message confidentiality, authenticity, and integrity.

skills
Blockchain
  • Solidity, Rust, C++, Go, Move
  • UniSwap, PancakeSwap, SushiSwap, DEFI, DEX
  • ERC20, ERC721, ERC1155
  • NFT Marketplace, Business/Financial Platform
Front-end

  • HTML, CSS, Javascript/Typescript

  • Bootstrap, Material UI, Chakra UI, TailwindCSS

  • React/Next, Vue/Nuxt, Angular

  • Gatsby, GraphQL, Three.js

Back-end
  • Laravel, WordPress
  • Node/Express/Nest
  • Python/Django, Flask
  • ASP.NET Core, MVC
  • Ruby on Rails
Library / APIs

Redux, Vuex, Antd, API Development, Socket.IO, jQuery, SQLAlchemy, REST APIs

Tools

Amazon Virtual Private Cloud (VPC), AWS SES, AWS SDK, AWS ECS, GitHub CI/CD, GitLab, Bitbucket, Auth0, Google SDK, VS Code, Sublime Text, Slack, Google Sheets

Paradigms

Model View Controller (MVC), Test-driven Development (TDD), Kanban, Atlassian

Platforms

MacOS, Red Hat Linux, Heroku, AWS, Firebase, Ubuntu, Google App Engine, Google Cloud Platform (GCP), Docker, Kubernetes

Storage

MongoDB, PosgreSQL, MySQL, Redis, Amazon S3, Google Cloud Datastore

Other

AWS API Gateway, TSLint, ESLint, RESTful Web Services, GitFlow, Front-end Development, Web Development, AWS, eCommerce, Axios, MERN Stack, APIs, Cloud, DevOps, CI/CD, Agile Methodology, Cloud Architecture, Project Management, Cybersecurity

Work experience
Frontend & Blockchain Developer
From July 2021 to August 2022
Roobinium United States

  • Built DeFi-enabled crypto collectibles game that allows players to stake NFTs avatars with interest-generating tokens.

  • Wrote NFT marketplace smart contracts using the upgradable multi-facet proxy called Diamond Standard (ERC-2535).

  • Developed token bridging application for swapping tokens between Ethereum and Polygon Matic network.

  • Worked on Ethers.js and Web3.js for web3 integrations in React and Vue frontends.

Blockchain Developer
From November 2020 to June 2021
Plavno Germany

  • Built decentralized oracle data feeds, fueling smart contracts with real world data.

  • Set up blockchain nodes (POA).

  • Tested network performances in the terms of TPS and stability.

  • Forked PancakeSwap and worked on the smart contracts for custom token supports.

  • Added ERC1155 NFT support to strengthen the NFT marketplace.

Senior Infrastructure Engineer/Team Lead
From March 2020 to October 2020
Verticurl Japan
  • Created CI/CD pipeline for ASP.NET application using Azure DevOps pipelines, helped engineering team setup Azure AD for authentication using LDAPs.
  • Physically connected the client’s data centers to AWS infrastructure using AWS Direct Connect and troubleshoot issues which include OSI layers 1-4, from setting up the physical connection, establishing ARP using 802.1Q VLAN encapsulation, and establishing eBGP peering relationships with AWS infrastructure.
  • Followed best practice guidance for highly available, scalable, and secure cloud/hybrid cloud environments using AWS Config.
Blockchain Developer
From August 2019 to February 2020
Enjin Singapore
  • Lead technical team through effective collaboration and coordination with clients to maintain project goals.
  • Bulit NFT marketplace using Web3.js and developed smart contracts for ERC721, ERC1155.
  • Developed key performance targets to ensure on time and on budget delivery according to client expectations.
  • Built landing page using Vue from design to implementation, including more than 20 pages with fresh designs
  • Developed community-driven platform to monetize voxel ASSETS and gaming experiences on the blockchain.
Full-stack Developer
From May 2018 to May 2019
eSportsPools Canada

  • Developed the free-to-join online eSports community to compete against players from around the world.

  • Built platforms that provides multiplayer titles, free to earn bragging rights or join premium tournament to win virtual prizes.

  • Upgraded website, solved issues and added features to be supported with latest responsive design strategies.

Work experience
Full-stack Developer
From November 2016 to March 2018
Elinext United States
  • Prepared architectural outline and led implementation of an OAuth OpenID Connect provider, enabling single-sign-on (SSO) to all Prodigy services.
  • Migrated existing services from EC2 to ECS Fargate, enabling autoscaling, blue-green deploys, and improving security.
  • Reimplemented existing Excel cash flow models as a Ruby on Rails and React application, lowering turnaround time for new models from days to minutes.
Software Engineer
From August 2015 to September 2016
Fidel Technologies Japan
  • Developed platform to offer complete cloud-based software solution to facilitate B2B and B2C integration.
  • Successfully streamlined platform with automations to help solve tedious daily tasks and internal disruptions.
  • Improved overall efficiency in order processing and shipping from most popular marketplaces and shopping carts.