# Xiaonan Zhang

> Senior Software Engineer at Dropbox

Location: San Francisco, California, United States
Profile: https://flows.cv/xiaonanzhang

## Work Experience
### Senior Software Engineer @ Dropbox
Jan 2015 – Present | San Francisco Bay Area
Working in infrastructure team that builds and owns large-scale distributed systems.

DRI (owner) of Dropbox’s real-time event stream processing and lambda infrastructure. The system processes 200K+ events per second.

Designed and built back off and rate limiting capabilities for several live-site critical services: real-time event stream processing, event scheduling, and experimentation and feature gating. 

Maintained messaging and notification infrastructure responsible for client sync, presence, email, sms, and push notifications.

Tech Lead for Server-Side-React rendering service. Made avg time-to-view metric for dropbox.com logged in home page 2x faster, saving 3 years of users’ life time every day.

### Software Engineer @ Twitter
Jan 2013 – Jan 2015 | San Francisco Bay Area
Worked in growth team, responsible for driving user engagement and improving key metrics. 

Designed and built backend infrastructure for sports platform, to enrich search experience on major sports leagues and events. Used for NBA, English Premier League, Cricket World Cup, Indian Premier League. Generated measurable MAU impact.

Designed and built backend for “Retweet with comment”. Achieved 100% (2x) improvement on all key engagement metrics (impression, favorite, reply, follow). 

Ran and analyzed A/B experiments on email and push notifications to increase user engagements.

### Software Engineer Intern @ Microsoft Game Studios
Jan 2013 – Jan 2013
Worked on telemetry and automation system for a Xbox One first-party AAA game. 

Built data visualization frontend to monitor game performance and crashes. 

Built telemetry data collection and reporting component in Unreal Engine 4.

Built test system that automated game plays in server farm, in order to collect data on performance, crashes, and bugs.

### Software Engineer In Test Intern @ Research In Motion
Jan 2011 – Jan 2011
Worked on automation test driver for RF and functionality tests for BlackBerry 10.


## Education
### Bachelor of Science - BS in Computing Science
Simon Fraser University
Jan 2010 – Jan 2013

### Bachelor of Engineering - BE in Computer Science
Zhejiang University
Jan 2008 – Jan 2013


## Contact & Social
- LinkedIn: https://linkedin.com/in/xiaonanzhang

---
Source: https://flows.cv/xiaonanzhang
JSON Resume: https://flows.cv/xiaonanzhang/resume.json
Last updated: 2026-03-22