hi, i'm

Leon Lei

Software engineer at Amazon, Brown CS alum, and maker of things I find interesting.

Learn moreGet in touch

About

A bit about me

I'm a software engineer with a B.S. + M.S. in Computer Science from Brown University, where I also taught AI and Web Development as Head TA.

I care about building things that are well-crafted — whether that's production software, research, or a weekend side project. My interests span machine learning, computer graphics, and full-stack engineering.

Outside of work, I've contributed to early-stage product work, published research in 3D geometry, and enjoy making games in my spare time.

Skills

Proficient

JavaPythonTypeScriptReactNode.jsMongoDBMySQL

Familiar

CC++C#TailwindVue.jsPostgreSQLDynamoDB

Experience

Where I've worked

Jul 2020 — Present

Seattle, WA

Software Development Engineer II

Amazon

  • ·Working on customer-facing features and infrastructure for package tracking experiences.
  • ·Led cross-functional efforts on reliability, experimentation, and service modernization.
  • ·Bar raiser for A/B testing best practices across the org.

May — Aug 2019

Seattle, WA

Software Engineer Intern

Amazon

  • ·Designed and implemented a developer debugging tool for rapid API snapshot access.

May — Aug 2018

New York, NY

Data Science Intern

Roche (Genentech)

  • ·Built an interactive visualization tool for patient journey analysis using R Shiny and D3.js.
  • ·Optimized data processing pipelines in R, achieving up to 40x speedup.

May — Jul 2017

Coral Gables, FL

Research Intern (REU)

University of Miami

  • ·Processed and visualized positional and auditory data using C# and MATLAB.

2016 — 2020

Brown University

B.S. + M.S. in Computer Science (Concurrent)

GPA 3.81 · Sigma Xi nominee

Projects

Things I've built

Early-Stage Startup MVP

Built the initial full-stack MVP for a science-based wellness startup during its early days. The team was later accepted into StartX and secured funding.

Demo available upon request

Full-stackStartX

Roominoes

Research on learning to assemble 3D rooms into floor plans. Published at Symposium on Geometry Processing 2021.

Publication

Research3DMLSGP 2021

ABOT Website

Website redesign for the ABOT database, built with Node.js and MongoDB, deployed on AWS.

Node.jsMongoDBAWS

HoloLens Teleoperation

ROS-enabled robot teleoperation using the Microsoft HoloLens for mixed-reality control.

Research report

ROSC#ResearchHoloLens

Senior UI/UX Capstone

User experience design capstone project completed at Brown University.

UI/UXDesign

Contact

Say hello

I'm always happy to chat about software, research, side projects, or anything interesting. Reach out and I'll get back to you.

Emailleon_lei@alumni.brown.eduLinkedInlinkedin.com/in/leon-leiGitHubgithub.com/leonl2

© 2026 Leon Lei

leonlei.com