Hello! I'm Hyeongchan from Korea. I enjoy programming, working out, and bouldering.
- Service many machine learning products in various domains, Audio & Speech, Vision, NLP, Recommendation Systems, Tabular, and LLM applications in many startups.
- Kaggle 2x Expert. the highest competition rank is top 0.1%.
- Here's my C.V. Feel free to contact me at the email
kozistr@gmail.com:)
previously...
- 2023 - 2024 : Joined
Sionic.AI. Built enterprise-grade LLM applications. - 2021 - 2023 : Joined
Viva Republica(Toss). Developed many products like BNPL, CSS, OCR, NPS, CDP, and in-house products. - 2020 - 2021 : Joined
Watcha. Developed Watcha recommendation system, and contributed to other products like WatchaPedia, in-house applications. - 2019 - 2020 : Joined
Rainist(Banksalad). Developed a transaction classifier service to analyze the categories with low latency, high accuracy, and in real-time. - 2019 : Joined
VoyagerX. Developed a speaker diarization product that automatically recognizes the contents of the meeting. - - 2019 : offensive security stuffs. Mainly researched and studied Linux kernel exploitation and reverse engineering.
Current Interests
- Kaggle Challenges
- Building something in Rust
- Bouldering
📊 this week i spent my time on:
I'm a Night 🦉
🌞 Morning 967 commits ██░░░░░░░░░░░░░░░░░░░░░░░ 06.37 % 🌆 Daytime 6063 commits ██████████░░░░░░░░░░░░░░░ 39.92 % 🌃 Evening 5547 commits █████████░░░░░░░░░░░░░░░░ 36.52 % 🌙 Night 2611 commits ████░░░░░░░░░░░░░░░░░░░░░ 17.19 % Last Updated on 20/03/2026 15:43:13 UTC
📈 my github stats