Hoyang Tsai

Senior Software Engineer

Frontend Architecture, Web Applications & AI-Augmented Engineering

• hire@hoyang.dev
• linkedin.com/in/hoyangtsai
• github.com/hoyangtsai

Summary

Senior Software Engineer with 10+ years of experience building web applications and complex interactive products. Specializes in React/TypeScript frontend architecture, performance optimization, and production troubleshooting. Earlier experience includes backend REST API development and Java-based enterprise systems. Applies automated testing, CI/CD, and AI-augmented engineering workflows to improve software quality and accelerate reliable delivery.

Experience

Senior Front-end Engineer, LottieFiles 2025/12 - 2026/08 Remote

• Resolved a production rendering regression by replacing per-frame scenegraph traversal with constant-time lookup
• Diagnosed and fixed a production color picker crash associated with 293 Bugsnag events affecting 16 users
• Owned Creator’s canvas text engine, delivering paragraph text and fixing font fallback, alignment, wrapping, and playback issues
• Built a reusable AI-augmented engineering workflow spanning diagnosis, planning, implementation, code review, and verification across Creator’s repositories

Senior Software Engineer, Phase 2023/11 - 2025/07 Taipei, Taiwan (Hybrid)

• Led frontend delivery of core Phase editor features including SVG import, co-editing presence, animation presets, and text-on-canvas editing
• Built a Figma plugin that imported designs into Phase with approximately 90% compatibility across supported Figma elements and converted component variants into interactions
• Improved application stability, reducing recurring bug-bash meetings from weekly to monthly

Staff Software Engineer, ShopBack 2022/05 - 2023/01 Taipei, Taiwan

• Led frontend development of the ShopBack Chrome extension, with 800K+ installs across 9 regional markets
• Reduced Chrome extension startup time by 91%, from 2.3 seconds to 0.2 seconds
• Added end-to-end smoke test automation to strengthen release QA coverage

Senior Front-end Engineer, Tencent 2016/01 - 2021/03 Shenzhen, China

• Built FinTech web applications and WeChat mini-programs for millions of users, including gold investment, currency exchange, and asset management products
• Developed cross-platform UI components and applications using React, Vue, and WeChat Mini Programs for Android, iOS, and desktop environments

Front-end Engineer, Foxconn 2013/07 - 2015/08 Kaohsiung, Taiwan

• Developed web applications spanning frontend interfaces and backend REST APIs

Software Engineer, Hismax 2011/10 - 2013/04 Kaohsiung, Taiwan

• Developed and customized Java-based PTC systems for manufacturing clients