Vincent Liu
Senior Fullstack Engineer
Summary
Senior Software Engineer with 8+ years of experience building large-scale SaaS and AdTech products across frontend and backend systems.
Experienced in React, TypeScript, Node.js, and Ruby on Rails, with a strong track record of leading architectural initiatives, driving large-scale codebase modernization, and delivering high-impact product features for global customers.
Passionate about building scalable user experiences, developer platforms, and AI-powered applications through close collaboration with product, design, and engineering teams.
Overview
11
11
years of professional experience
Work History
Senior Fullstack Engineer
Placements.io
06.2021 - Current
- TypeScript Migration Leadership: Led the migration of a 300k+ line legacy JavaScript codebase to TypeScript, establishing engineering standards, conducting internal workshops, and driving adoption across teams. Successfully increased TypeScript coverage to over 50%, improving maintainability, type safety, and overall code quality across the platform.
- Frontend Architecture & Scalability: Architected and delivered a large-scale refactor of a mission-critical nested table system, transforming a feature-heavy legacy implementation into a scalable recursive architecture. Implemented complex multi-level drag-and-drop interactions for hierarchical datasets while maintaining excellent rendering performance and responsiveness.
- AI Product Development: Led frontend development of an AI-powered chatbot experience using React and streaming APIs, collaborating closely with product and design teams to create a highly responsive and intuitive conversational interface.
- Global Platform Integrations: Designed and maintained core integrations with TikTok, LinkedIn, and DocuSign, building scalable OAuth workflows and synchronization pipelines using Ruby on Rails and Node.js to enhance enterprise-scale customer operations.
- Engineering Productivity: Enhanced developer productivity and long-term maintainability via modular architecture initiatives, testing improvements, and cross-functional collaboration within a distributed US-based engineering organization.
Software Engineer
Ucfunnel
02.2015 - 07.2020
- High-Scale Reporting Platform: Designed and developed large-scale reporting platform that processed and distributed advertising performance data for thousands of global users, enhancing data accessibility.
- Data Visualization & Analytics: Built analytics dashboards using Elasticsearch and Kibana to visualize millions of advertising events and bidding records, enabling data-driven decision making for advertisers and publishers.
- Recommendation System: Integrated PredictionIO-based recommendation services to deliver personalized content recommendations based on user engagement and behavioral data.
- Creative Ad Tech: Developed high-impact Richmedia ad templates (e.g., 3D Marquee) using vanilla JavaScript, improving loading speed and visual performance for user engagement.
Education
M.S. Program (Coursework Completed / Incomplete) - Graduate Institute of Networking And Multimedia
National Taiwan University
Taipei 04.2001 -
BBA - Department of Information Management
National Taiwan University
Taipei 04.2001 -
Skills
Frontend: React, TypeScript, JavaScript (ES6), Nextjs, Redux
Backend: Nodejs, Express, Ruby on Rails, Python (Flask)
Databases: MySQL, MongoDB, Elasticsearch, Redis
Cloud & DevOps: AWS (EC2, S3), Docker, CI/CD, Git
Engineering Practices: System Design, Frontend Architecture, API Design, Testing, Code Review, Technical Leadership
Timeline
Senior Fullstack Engineer
Placements.io
06.2021 - Current
Software Engineer
Ucfunnel
02.2015 - 07.2020
M.S. Program (Coursework Completed / Incomplete) - Graduate Institute of Networking And Multimedia
National Taiwan University
04.2001 -
BBA - Department of Information Management
National Taiwan University
04.2001 -