# Seung Yun Lee

> Software Engineer @ SingleStore

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

I'm a software engineer at SingleStore, based in San Francisco, CA.

I graduated from Carnegie Mellon University in 2024 with a B.S. in Electrical and Computer Engineering.

## Work Experience
### Software Engineer II @ SingleStore
Jan 2025 – Present

### Software Engineer @ SingleStore
Jan 2024 – Jan 2025 | San Francisco, California, United States
Engine - Query Optimizer Team

### Software Engineer @ VoyagerX
Jan 2021 – Jan 2023 | Seoul, South Korea
- Designed, implemented, and maintained logging pipeline and an on-premise Elasticsearch database processing 20M log records daily, empowering a team of 30 to easily access business intelligence and observability data through Kibana GUI.
- Led efficient data usage initiatives by automating key user metrics, enabling the marketing team to save $10K monthly by detecting inefficient ad campaigns.
- Managed release schedule while cooperating with the QA team, conducted 40+ technical interviews, and resolved production incidents for a globally used product of 100K+ MAU.
- Pioneered template feature project used by 7% of total users through POC-driven development, while facilitating meetings to set milestones, brainstorm future features, and to coordinate specification with other stakeholders.
- Implemented 7+ user facing features for a web-based video editor using Typescript/React and custom static-linked Ffmpeg build, and improved edge-case encoding performance by 30x.

### Software Engineering Intern @ Salesforce
Jan 2021 – Jan 2021 | San Francisco, California, United States
- Instrumented Salesforce core platform code in Java Spring with internal logging framework to collect business-critical metrics
- Created Grafana dashboard and wrote queries for availability, error rate, request rate, and duration metrics that align with SLIs and SLOs of team’s features, aiding the team to monitor system health and troubleshoot during production incidents

### Teaching Assistant @ Carnegie Mellon University School of Computer Science
Jan 2020 – Jan 2021 | Pittsburgh, Pennsylvania, United States
- Teaching Assistant for 15-122 Principles of Imperative Computation
- Led weekly lab sessions with 20 students, instructing and answering questions on imperative computation concepts such as pointers and data structures
- Held office hours and graded assignments while adjusting rubric to reflect the students’ understanding for a course of 500 students

### Software Engineering Intern @ Salesforce
Jan 2020 – Jan 2020 | San Francisco, California, United States
- Implemented a GraphQL API for the Data Federation Services server by integrating the GraphQL library with the team's existing codebase in Java Spring, enabling customers to query DFS API through frontend framework Lightning Web Components
- Designed robust unit testing and integration testing using testing libraries such as JUnit, Mockito and Hamcrest

### Research Assistant @ Computational Biology Department (Carnegie Mellon University)
Jan 2019 – Jan 2019 | Pittsburgh, PA
- Implemented and maintained a HDF5 database system through h5py python package
- Collaborated with a team of 7 to optimize the database system to the sparse-matrix specifications of the project
- Updated script written in Python 2 to Python 3 and used it to generate protocols for Eppendorf epMotion 5075 liquid handler 
- Created HTML-CSS based framework for the documentation of entire project

### Audio Video Engineer @ Carnegie Mellon University
Jan 2018 – Jan 2019 | Pittsburgh, PA
- Organized audio equipment during music concerts
- Devised trouble shooting plans when the equipment didn’t work as expected
- Collaborated with the recording services crew and stage management to accomplish a sound concert

### Research Assistant @ Georgetown University
Jan 2017 – Jan 2017 | Washington D.C. Metro Area
- Managed larvae specimen and collected data on a daily basis for team of 5
- Conducted an individual research project and drafted a paper to enter a research paper competition 
- Developed communication skills through weekly lab meetings and analysis skills through statistics program R workshop


## Education
### Bachelor's degree in Electrical and Computer Engineering
Carnegie Mellon University


## Contact & Social
- LinkedIn: https://linkedin.com/in/seung-yun-lee
- GitHub: https://github.com/simonlee99ap
- Portfolio: https://open.substack.com/pub/simonlee99ap?r=16x6qr&utm_medium=ios

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Source: https://flows.cv/seungyunlee
JSON Resume: https://flows.cv/seungyunlee/resume.json
Last updated: 2026-03-31