Yu-Lin Cheng

Senior Frontend Engineer

• contact@rainforest.tools ·
• Taipei, Taiwan ·
• linkedin.com/in/yulin-cheng ·
• github.com/rainforest-dev ·
• rainforest.tools

Experience

• Angible

  May 2025 - Present

  Senior Frontend Engineer

  Lead frontend development across two retail product lines in an edge-AI monorepo. Migrated end-to-end authentication to a managed identity provider, retiring a large in-house auth layer, and delivered the role-based permission matrix that governs access across the dashboard. Established the project’s end-to-end test foundation from scratch and moved its container delivery pipeline onto managed Kubernetes. Own the frontend architecture for a new review-operations area — a shared data-fetching foundation, customer-scoped state boundaries, and an ability model that decides which internal roles reach which tools. Cut pull-request feedback from roughly an hour to under fifteen minutes by moving the CI gate onto hosted runners, guarding against superseded runs finishing after cancellation, and baking a prepared runner image — after tracing the delay to a self-hosted pool that could only serve one job at a time.

• CodeGreen

  Jul 2022 - Oct 2024

  Senior Frontend Engineer

  Worked at a startup from the ground up, developing multiple frontend projects and selecting appropriate technologies to drive successful implementations.

  • Hashgreen Dex — rainforest.tools/portfolio/hashgreen-dex

    • Led the frontend development team in building the industry-first decentralized exchange (DEX) on the Chia blockchain.
    • Collaborated closely with designers and backend engineers to design, develop, and launch a seamless user experience that enabled secure and efficient trading of digital assets.
    • Utilized cutting-edge technologies like Next.js and Styled Components in conjunction with TailwindCSS.
    • Focusing on SEO and performance optimization, I successfully optimized the display of 500+ unique cryptocurrency assets, ensuring a seamless user experience for traders.

  • Hoogii Wallet — rainforest.tools/portfolio/hoogii-wallet

    • As part of a collaborative effort with another frontend engineer, was responsible for designing and implementing the core functionality for app-to-extension interactions, including exposing APIs to browsers and ensuring seamless communication between our web3 cryptocurrency wallet extension and external applications.

  • HashgreenSwap — rainforest.tools/portfolio/hashgreen-swap

    • Led the frontend development effort for the first Automated Market Maker (AMM) on Chia blockchain, collaborating with designers and backend engineers to deliver a seamless user experience.
    • Successfully introduced Nx, a monorepo tool, to streamline and maintain various aspects of our product, including unit tests, end-to-end tests, loading tests, and UI libraries.

  • OpenCGT — rainforest.tools/portfolio/opencgt

    • Led the frontend development for a B2B product built with Next.js, collaborating closely with designers and backend engineers to deliver a seamless user experience.
    • Designed and implemented social logins using Auth.js and Auth0, ensuring secure and efficient user authentication.
    • Implemented role-based authorizations using Casbin.js, providing fine-grained control over user access and permissions.
    • Set up an automated Continuous Integration/Continuous Deployment pipeline utilizing NX, streamlining the product release process and minimizing manual effort.

• Jubo Health

  Dec 2020 - Jun 2021

  Software Intern

  Maintain and develop applications for long-term care facilities.

• Galaxy Software Services, GSS

  Jul 2020 - Nov 2020

  Frontend Intern

  Provide support for the maintenance and enhancement of Software as a Service (SaaS) products.

• WeBIM Service

  Jul 2018 - Oct 2019

  Research and Development Assistant

  Utilize Swift and Vue for the development of a digital twin product.