Johnny Xue

Software Development Engineer with expertise in full-stack development, distributed systems, and cloud-native architecture. I build scalable, reliable software solutions with a focus on clean design, operational excellence, and measurable impact.

With graduate training in both Computer Science and Statistics, I bring a blend of strong engineering fundamentals and quantitative reasoning to every project — from designing high-throughput microservices to developing data-driven applications.

University of Pennsylvania
University of Pennsylvania Master of Computer and Information Technology
University of Virginia
University of Virginia Master of Science in Statistics
Purdue University
Purdue University Bachelor of Science in Economics
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Professional Experience

Software Development Engineer

Amazon
Jun 2025 – Present Seattle, WA
  • Engineered microservices for payment widget on order details page and Wallet page using AWS Lambda, handling over 1,200 TPS while achieving 99.8% service uptime and maintaining sub-300ms latency
  • Developed and maintained a dedicated Node.js Backend-for-Frontend (BFF) package to aggregate and transform data from diverse downstream payment microservices, resulting in a 33% improvement in page load time
  • Accelerated deployment by implementing full infrastructure-as-code using AWS CDK, automating environment configuration and reducing deployment time from hours to under 15 minutes
  • Designed a dynamic Feature Mapper framework for payment methods expansion, enabling seamless onboarding of new methods across EU and US markets, reducing time-to-market to 3 SDE days
  • Established comprehensive monitoring using AWS CloudWatch, identifying and resolving 3 critical bottlenecks resulting in a 24% improvement in payment processing time
  • Orchestrated A/B testing using WebLab to evaluate payment widget performance, delivering zero downtime launches and validating production behavior before scaling to millions

Senior Data Analyst

Sentara Health
Jul 2021 – May 2025 Richmond, VA
  • Led the reinsurance prediction project utilizing Python and machine learning models to identify high-cost patients for risk assessment and premium setting for 2,100+ plan beneficiaries and $18M resource allocation
  • Led the SQL code review project to standardize and modularize 60+ SQL queries with over 200k lines, reducing average query run times, streamlining maintenance, and accelerating new hire onboarding

Data Analyst

Wilson Consulting Group
May 2020 – Jul 2021 Washington, DC
  • Established data pipeline for e-Commerce dashboard utilizing Snowflake SQL, Python, and Tableau, automating the computation of 17 cost categories with detailed visualization of product stocking level and profitability

Projects

ArtiEcho
View on GitHub

ArtiEcho

Full-stack web app that lets users explore global art through a 3D interactive globe and ambient sounds. Discover artworks by cultural origins, artists, and genres with real-time data visualization. Hosted on AWS EC2 & RDS.

React Three.js Node.js Express PostgreSQL AWS
Online Shop
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Online Shop

Full-stack e-commerce application with an Angular SPA frontend and a Spring Boot REST API backend. Features product catalog browsing, real-time shopping cart management, order submission, and order history with expandable item details. Built with a layered architecture using the DTO pattern, JPA/Hibernate ORM, and responsive UI with Bootstrap.

Angular TypeScript Java Spring Boot JPA/Hibernate MySQL REST API

Get in Touch

I'm always open to discussing new opportunities, interesting projects, or just having a chat about technology and software engineering.

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