# Rui Nan

> Distributed Systems & Platform Engineering | Large-Scale Event Processing, Reliability & Scalability & Observability

Location: San Jose, California, United States
Profile: https://flows.cv/ruinan

Backend Engineer specializing in distributed systems and cloud-native infrastructure.

I have a strong track record of architecting high-availability platforms, executing high-risk legacy migrations, and solving complex scalability challenges for FinTech and E-commerce leaders (Marqeta, DoorDash, eBay). My focus is on system correctness, operational simplicity, and long-term maintainability.

Expertise: Distributed Systems, AWS/K8s, High-Volume Data Pipelines, Platform Reliability.

## Work Experience
### Senior Software Engineer @ Marqeta
Jan 2022 – Present | San Francisco Bay Area
Responsible for the architecture and modernization of Marqeta’s high-throughput Webhooks and Data Delivery platforms.

Lead engineering efforts in distributed system design, cloud-native migrations (AWS/K8s), and cross-region disaster recovery strategies.

Partner with cross-functional teams to define reliability standards, security compliance, and observability best practices.

Mentor engineers and drive documentation initiatives to improve team velocity and operational maturity.

### Software Engineer @ DoorDash
Jan 2021 – Jan 2022 | Mountain View, California, United States
Backend engineer for the Cx Growth domains, focused on building scalable services to drive user engagement.

Engineered backend workflows for targeted, context-aware notification systems.

Consolidated fragmented app-level logic into unified, centralized backend services to improve architectural consistency.

Enhanced service reliability and operational maturity by implementing SLOs, canary deployment pipelines, and safer release strategies for high-traffic systems.

### Software Engineer @ eBay Ads
Jan 2019 – Jan 2021 | San Jose, California, United States
Full-stack engineer for eBay Ads (Promoted Listings), responsible for developing high-traffic surfaces for advertiser campaign management.

Delivered end-to-end features for the Campaign Details Page and Promoted Listings Dashboard using React and Java.

Contributed to frontend infrastructure by developing a shared React component library and establishing consistent UI patterns across the organization.

Implemented complex feature gating and eligibility logic to ensure policy compliance for diverse advertiser segments.

Honors: Recipient of a Spot Award and multiple "You Made My Day" awards (2020-2021) for engineering excellence and cross-team collaboration.

### Full Stack Engineer @ Stronghold
Jan 2018 – Jan 2019 | San Francisco, California, United States
Developed core features for a cryptocurrency trading platform, focusing on financial transaction accuracy and system stability.

Built critical trading workflows including secure wallet operations, order execution, and lifecycle management.

Implemented backend microservices to decouple trading logic, facilitating system scalability.

Authored and published the platform’s public NPM SDK to simplify integration for external developers and partners.

### Web Developer @ Flipboard
Jan 2016 – Jan 2016 | Beijing City, China


## Education
### Master’s Degree in Computer and Information Sciences, General
University of Pittsburgh
Jan 2015 – Jan 2017

### Master's degree in control science
Harbin Institute of Technology
Jan 2011 – Jan 2013

### Bachelor's degree in control science
Harbin Institute of Technology
Jan 2007 – Jan 2011


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

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