Phong Dong

I’m a Senior Software Engineer with 10 years in enterprise and e-commerce tech, specializing in distributed systems, cloud-native architecture, and AI-augmented backends. I focus on building reliable platforms that move fast without sacrificing correctness, observability, or operational excellence.

At Google, I architected cross-device synchronization using Java, Spanner, and Pub/Sub, delivering seamless real-time parity across mobile and web. I built a recurrence engine for appointment slots, designed multi-calendar conflict detection, and optimized large-scale meeting scheduling infrastructure (up to 100k guests), cutting processing latency by 40%.

I also integrated Gemini AI for automated note-taking and intelligent scheduling, and built a Time Insights analytics dashboard with React, TypeScript, and D3.js. On the reliability side, I delivered observability pipelines for real-time monitoring and reduced mean time to resolution by 50%, while building testing frameworks for event synchronization that achieved 99.9% uptime.

Previously at OfferUp, I built a unified notification platform and a real-time messaging platform, refactoring monolith APIs into microservices to reduce P99 latency by 20% during peak traffic. I’m energized by cross-functional collaboration, clear API contracts, and engineering practices like SLOs, error budgets, and instrumentation that continuously lower incidents over time.