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Mu Jing Tsai Frontend Developer
Profile

A goal-oriented front-end engineer with 5+ years of JavaScript development experience. Successfully launched blockchain projects handling 2.1M transactions and serving 26K users. Also the author of a JavaScript programming book. Open to transitioning into backend development and eager to grow skills in building scalable server-side systems.

Skill
  • •Frontend : React.js, Next.js, Tailwind CSS, TypeScript, XState
  • •Web3 : Web3.js, Ethers.js, Solidity
  • •Backend/Tools : Node.js, REST APIs, Jest, CI/CD
    • Languages
    English — IELTS 6.5
    Mandarin — Native
    Conferences

    Speaker, Modern Web 2021 – Weird Things in JavaScript

    ~400 attendees

    Speaker, JSDC 2021 – JS Modular Evolution

    ~300 attendees
    Education

    Bachelors - Electronic Engineering

    National Taiwan University of Science and Technology
    2011 – 2015
    Professional Experience

    Sr. Frontend Developer

    portto Co., Ltd.
    01/2022 – 03/2024
  • •Improved UX for a multichain crypto wallet (1.6M users) by using XState for state management and enhancing security through clear UI.
  • •Drove the launch of an experimental inscription project, resulting in 2.1M transactions and 26K users within days, significantly enhancing user engagement.
  • •Led frontend development of a blockchain Monopoly project from concept to launch, securing executive approval and team resources.

    • Frontend Developer

    Snapask Taiwan
    03/2020 – 01/2022
  • •Eliminated system downtime completely (from 2s to 0s) by optimizing the deployment flow with PM2, ensuring uninterrupted user experience.
  • •Standardized shared components with Rollup, cutting development time 30% while maintaining UI consistency.

    • Frontend Developer

    Chaintech Technology Co., Ltd.
    03/2019 – 03/2020
  • •Architected the UI for the company's internal cloud platform with React.js, increasing code maintainability by using TypeScript.
  • •Implemented CI/CD flow with DroneCI, to enhance system reliability.

    • Frontend Developer

    Chenfeng Technology Co., Ltd
    06/2018 – 12/2018
  • •Significantly improved administrative staff work efficiency by building a flight booking management admin panel using Vue.js and Element UI framework.
    • Projects

    Appworks Blockchain Program 2023

  • •Built limit order exchange prototype referencing LooksRare, with complete test coverage.
  • •Implemented smart contracts using Solidity and Ethereum knowledge.

    • ETH Rome 2023

  • •Architected the frontend interface for a private transfer blockchain solution.
  • •Secured sponsorship award.

    • Raycast Open-Source Extension

  • •Built a crypto price crawler with React

    • Publications

  • •Authored technical book “JavaScript Concept Sandwich“ to simplify complex JavaScript concepts for beginners.