Matthew Lin

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Staff Software Engineer

Teladoc Health

Nov 2019 - Current (6 years 7 months)

• Led the design and implementation of a HIPAA-compliant telemedicine platform using Ruby on Rails, Go, and AWS ECS with Terraform, scaling to support 8,000+ concurrent virtual care sessions for chronic care patients during COVID-19. • Developed WebRTC-based video consultations with Go and React, integrated with AWS MediaLive to support 8,000+ concurrent sessions with low latency for chronic care patients. • Built scheduling and Remote Patient Monitoring (RPM) features using Rails and PostgreSQL (AWS RDS), leveraging database indexing to optimize real-time patient data queries. • Implemented notification system with Go, AWS SNS/SQS, and Redis, delivering 1.5M+ monthly SMS and email alerts for patient communication and care updates. • C
Senior Full-Stack Engineer

Duolingo

Sep 2015 - Oct 2019 (4 years 2 months)

• Architected and scaled Thinkific's Learning Management System (LMS) with Ruby on Rails, React, and AWS EC2, enabling thousands of course creators and deliver seamless, engaging online education to millions of students. • Enhanced mobile learning with responsive React interfaces and RESTful APIs built with Rails, streamlining course access for seamless student experiences. • Optimized course search with Elasticsearch and Rails APIs, improving content discoverability and boosting student engagement for thousands of users. • Designed scalable quiz workflows with Redis and Sidekiq, handling real-time scoring for 6,000 concurrent users with 99.9% reliability. • Utilized React's hooks and Context API to build high-performance progress trac

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