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Yu Taek Lee

@yutaeklee

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Software engineer at NAVER and solo builder of Lanma, whose production AI language app cut false corrections to 0%.

Singapore

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At NAVER, I built React and TypeScript services used by 40M+ weekly page views and 15M monthly active users. I also built an LLM-powered PR review bot adopted by five teams, and optimized a high-traffic service to reduce average First Contentful Paint from 3.4 seconds to 1.9 seconds.

As the solo founder and engineer of Lanma, I built and launched an AI language-learning app on iOS and Android. Its production-code evaluation harness helped reduce false corrections to 0% and AI costs to 38–63% of baseline; I’m now pursuing an M.Sc. in Artificial Intelligence at Nanyang Technological University.

Experience

Work history, roles, and key accomplishments

Current

Founder & Software Engineer

Current

Lanma: Learn Languages

Jan 2026 - Present (9 months)

Built and launched an AI language learning app on iOS and Android with 100+ users, using Flutter, FastAPI, and PostgreSQL. Developed a live-model eval harness that reduced AI cost to 38-63% of baseline and false corrections to 0%.

Flutter fastAPI PostgreSQL LLM Whisper ASR GROQ Deep Seek OpenAI Model Evaluation Harnesses Spaced Repetition

Software Engineer

NAVER

May 2021 - Mar 2026 (4 years 10 months)

Built React/TypeScript web services and backend-for-frontend layers serving 40M+ weekly page views and 15M monthly active users. Developed LLM-powered tools including a PR review bot adopted by 5 teams and a documentation RAG prototype.

React TypeScript LLM GitHub Actions RAG Faiss Docker Kubernetes Redis Sentry Slack Serverless Cron Job

Education

Degrees, certifications, and relevant coursework

Nanyang Technological University

Master of Science, Artificial Intelligence

2025 -

M.Sc. in Artificial Intelligence candidate at Nanyang Technological University, expected to graduate in December 2026.

University of Seoul

Bachelor of Science, Electrical and Computer Engineering

2014 - 2021

Grade: 3.28

Activities and societies: Freshman Class Representative for Electrical and Computer Engineering (2014); President of the official International Student Exchange Association (2018)

B.Sc. in Electrical and Computer Engineering from the University of Seoul, with a GPA of 3.28 (Major: 3.49).