About Me
I'm a software engineer who is curious about every new things. My motto is "Keep Blitz and Be Simple" - I always try to be simple and efficient in my approach to problem-solving.
I specialize in MLOps platform development, DevOps engineering, and cloud-native technologies. With extensive experience in operating large-scale systems, I've successfully managed over 2000 GPUs and built robust, scalable infrastructure solutions.
Experience
Toss Bank
Machine Learning Engineer
Oct 2023 - Present
Current
- Built Machine Learning Platform contributing to flexible model development and deployment
- Pioneered high-performance Online Feature Store Platform using ScyllaDB, achieving performance improvements in write throughput and read latency
- Engineered large-scale Airflow batch systems managing 2K+ workflows across 7+ clusters with 99.9% uptime
- Developed Python-based Credit Strategy System reducing deployment time by 50%
- Built caching system using MongoDB, reducing errors by 60% in credit scoring system
- Migrated data ingestion pipeline processing 9M+ daily records from Elasticsearch to MongoDB
Kakao Enterprise
Software Engineer, Machine Learning Platform
Mar 2022 - Aug 2023
- Developed and maintained large-scale MLOps platform managing over 2,000 GPUs across 20+ Kubernetes clusters
- Built MSA components including backend API Server, CLI, SDK, and inference infrastructure
- Managed Jupyter Notebook functionality integrating JupyterHub and Enterprise Gateway
- Led GPU migration projects with 99.9% system uptime during facility relocations
- Implemented Model Artifact resource functionality with CRUD APIs and versioning
- Established unified API server error code policy across multiple backend teams
Kakao Enterprise
Software System Engineer, AI Lab
Jul 2020 - Feb 2022
- Built infrastructure and tools supporting voice-related research for 100+ AI researchers
- Designed Voice Transcription Tool with React and Django enabling processing of 3K+ voice data daily
- Operated voice data log management system handling 3M+ daily logs from 100K+ users
- Built Kakao i Cloud STT service enabling 20+ custom user language models on Kubernetes
- Developed real-time STT demo services with WebSocket streaming and file upload support
Skills & Technologies
Programming Languages
Cloud Native & DevOps
Databases & Storage
Machine Learning & Data
Frameworks & Tools
Education
Kyungpook National University
Bachelor of Computer Science • GPA: 4.10/4.50
2015 - 2021
Darmstadt University of Applied Sciences, Germany
International Studies Program
Spring 2020