Yidong Liu

About

Yidong Liu
647-633-6603 | yidong.liu@alumni.utoronto.ca | Toronto, ON | yidong-liu.com

Summary of Qualifications
Engineering-trained Full Stack Developer with 3+ years of experience building authentication systems, platform tooling, and Cloudflare-based web infrastructure. Self-directed transition into software, with a track record of quickly mastering new domains, decomposing ambiguous problems, and turning brittle workflows into maintainable systems. Strong in React, TypeScript, Node.js, OAuth/OIDC, and edge-first architecture, with practical experience using AI-assisted engineering to improve team delivery while keeping human judgment on architecture, correctness, and validation.

Skills
Languages: TypeScript, JavaScript, SQL
Frontend: React, Next.js, SolidStart, Angular, Redux, MobX, TanStack Router, TanStack Query, CSS/SASS
Backend & Infrastructure: Node.js, Bun, Deno, Nest.js, REST APIs, OAuth 2.0/OIDC, Auth0, JWT, Docker, Redis, MinIO, AWS EC2/S3, Cloudflare Workers, R2, D1, Durable Objects, Queues, Containers
Tools & Ecosystem: Git, GitHub Actions, pnpm, Nx, Electron, WebSocket, Drizzle ORM, VS Code, GitHub Copilot, Jira, Figma, SonarQube

Experience
Software Engineer II, EQ Bank, Toronto February 2025 - Current

  • Leading the in-progress integration of Interac Sign-In Service into EQ Bank's authentication ecosystem, coordinating secure identity flows across frontend, platform, and vendor integration constraints.

  • Spearheaded the frontend migration of the core online banking platform from legacy HID to Auth0 (OAuth 2.0/OIDC), supporting a zero-downtime transition and a modernized authentication flow for customers.

  • Architected and developed the centralized Auth0 Universal Login Page used across EQ Bank platforms, using a modular design to maintain brand consistency, performance, and long-term maintainability.

  • Engineered a pluggable, decorator-based step-up authentication library using the Strategy Pattern, allowing developers to secure sensitive API methods through a declarative interface.

  • Designed a snapshot-and-resume workflow that captures application state before Auth0 MFA redirection and resumes interrupted API requests after authentication, reducing user friction during high-security flows.

  • Created the company's first internal VS Code Copilot Agent plugin and introduced it within the team, moving AI usage from ad hoc prompting to a maintainable team workflow with shared skills, centralized updates, and IDE-level context from Jira, Figma, and SonarQube.

Full Stack Software Developer, Plexxis Software, Brampton April 2023 - February 2025

  • Collaborated on a micro-frontend architecture to unify 10+ legacy products into a single web-based interface (React/Electron), enabling smoother cross-module workflows within a large-scale agile team.

  • Co-developed a custom, type-safe routing framework by forking TanStack Router to centralize RBAC and automate permission-based redirects across the product suite.

  • Contributed to the design of an optimistic UI system, implementing automated rollback mechanisms that improved perceived performance by 40% during high-latency API interactions.

  • Developed core features for an internal HR platform (Nest.js/React), including a real-time validation template system that reduced weekly timesheet submission time by 98% from 5+ minutes to under 5 seconds.

Full Stack Software Developer, TopInfoDev IT Consulting, Toronto February 2022 - April 2023

  • Built and maintained full-stack web application features across client projects, contributing to frontend implementation, API integration, and production issue resolution.

  • Strengthened practical software engineering fundamentals through hands-on delivery work while transitioning from an engineering background into professional software development.

Personal Projects
Silvergrain / Personal Photography Portfolio Platform: yidong-liu.com

  • Designed and built a Cloudflare-native photography portfolio platform that powers my own portfolio and privately onboarded portfolios for other photographers through custom domain setup.

  • Implemented an edge-first architecture using Cloudflare Workers, R2, D1, Durable Objects, Queues, and Containers, with a dedicated image conversion pipeline and managed admin surface.

  • Built the application with SolidStart, TanStack Router, TypeScript, Drizzle ORM, and Cloudflare bindings, focusing on fast public pages, maintainable content management, and reliable image delivery.

  • Treated the project as an architecture and product-quality exercise rather than a commercial product, using it to explore practical tradeoffs in edge deployment, media processing, caching, and multi-site operations.

Chitchat: chitchat-laoke.vercel.app, GitHub: github.com/stevenlyd/chitchat

  • Developed a minimalist real-time chat application using Next.js, designed as a Progressive Web App for offline functionality and mobile installation.

  • Leveraged service workers for background sync and push notifications to improve mobile usability.

Community Contributions
TanStack Router: Reported an issue affecting route ID uniqueness, identified the root cause, and contributed test cases.
s3mini: Reported a reproducible bug in an S3-compatible client library; the issue was accepted and fixed upstream: codeberg.org/thinking_tools/s3mini/issues/2.

Education
BASc in Civil & Mineral Engineering, University of Toronto (St. George Campus), June 2019