# John Lee

> Fullstack Software Engineer

Location: New York City Metropolitan Area, United States
Profile: https://flows.cv/johnlee2

Software Engineer experienced in building full-stack JavaScript applications with React, Node, Express, and relational & non-relational databases. Contributor to the open-source community and co-creator of Watchdogs, an AWS Lambda function metric visualizer.
When I'm not coding, I am either doing my best to not hurt myself playing volleyball, trying a new cuisine, or finding that last Lego piece that I dropped on the floor.

Find me on GitHub: https://github.com/johnsaehwanlee

Recent Talks and Publications:
-"Start Getting Hooked to React Hooks" | Software Engineering Speaking Series hosted by Codesmith, Jeeny and Bractlet
- "Streamlining Your AWS Lambda Metrics with Watchdogs" | Medium

## Work Experience
### Software Engineer II @ Seed Health
Jan 2026 – Present

### Software Engineer @ Seed Health
Jan 2023 – Jan 2026

### Software Engineer @ Watchdogs (Open Source)
Jan 2023 – Jan 2026
-Developed a durable and performant web application that utilizes AWS CloudWatch and SDK to monitor and visualize health analytics of AWS Lambda functions, providing a simple yet informative user experience.
-Featured Cloudwatch metrics using Chart.js, which integrated seamlessly into frontend components and dynamically streamlined the user’s AWS Lambda data to be displayed in an easily readable format.
-Incorporated TypeScript, allowing for a more streamlined refactoring process by providing static typing of components and concise error identification during compile time.
-Utilized React Router to enable a seamless user experience with conditional rendering of different components in the navigation bar and optimize rendering performance with minimal network requests in a single page app.
-Implemented Express as the backend framework to process HTTP requests, route and error handling while promoting modularization of the server’s functionality with its middleware design pattern.
-Integrated Redis for the purpose of caching the chunks of data received into local memory which helped reduce both the number of requests made to third-party APIs and response times of re-displaying metrics.
-Created a development environment with Vite in order to streamline the development process, taking the advantage of its built-in development server, abstracted configuration file, and in-browser ES module handler.
-Adapted Docker to containerize the application, creating a scalable, portable, and immutable infrastructure that enhances performance efficiency and allows the app to run seamlessly across various operating systems.
-Deployed the dynamic web application using Heroku via Git Integration, which allowed for minimal reconfiguration of the codebase while maintaining core functionality.

### Crab Rave - Music Discovery Service @ Open Source
Jan 2022 – Jan 2023
-Created reusable components with React to easily maintain state variables with Hooks throughout the application for the sake of ensuring data within components are able to be dynamically updated.
-Stored song information within MongoDB that allowed for simple schema structuring and accessibility for the data to be displayed within a personalized saved songs list.
-Constructed middleware functions via Express that allowed users to make HTTP requests to a web API in order to play songs based on the data received in the embedded iframe or store the data to the user’s schema.

### Recess - Social Media Platform for Hosting Sporting Events @ Open Source
Jan 2022 – Jan 2023
-Created testing suites using Jest and Supertest that simulated the rendering of React components and the handling of API requests to a HTTP server in order to validate proper functionality of existing code.
-Engineered a PostgreSQL database structure to contain relational data stored, enabling concurrent connections from multiple clients that can update game state and have changes reflected for other players.

### Quality Assurance Specialist @ 3DBio Therapeutics
Jan 2020 – Jan 2022


## Education
### Codesmith

### Bachelor's degree in Mechanical Engineering
Rensselaer Polytechnic Institute


## Contact & Social
- LinkedIn: https://linkedin.com/in/john-saehwan-lee

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Source: https://flows.cv/johnlee2
JSON Resume: https://flows.cv/johnlee2/resume.json
Last updated: 2026-03-30