Jiho Lee Email & Phone Number

* Served as the Core DevOps Engineer for the on-premises enterprise ML research platform, Yennefer* Delivered and managed the on-premises ML infrastructure service, AI Box- Deployed and operated the Kubernetes-based core platform (Yennefer) within a secure, closed-network environment for the Financial Supervisory Service’s unfair virtual asset trade analysis platform- Successfully recovered metadata after loss on a production Rook Ceph Mon, leveraging OSD Bluestore definitions- Integrated and maintained an external 400TB Ceph storage cluster with Kubernetes via Rook, including troubleshooting and issue resolution- Integrated and operated an integrated authentication system (Ory Kratos Identity Provider and Ory Hydra OAuth2 + OIDC Provider) within enterprise environments- Incorporated Intel Gaudi HPU systems, built and applied HPU-based environment preset images, and established demonstration environments- Managed Kubernetes-based products in enterprise environments- Implemented and operated highly available Postgres environments using CloudNativePGDeployed and managed Thanos-based HA Prometheus environments- Established and maintained object storage within enterprise solutions using Rook Ceph RGW

* Served as Team Leader of So1s, a venture project under the Upstage-led Software Maestro program* Designed and developed So1s, a Kubernetes-based framework for deploying and managing real-time ML model inference APIs* Developed Helm Chart-based deployments- Integrated Prometheus sharding, Kiali-based traffic tracing, and Nix-based provisioning scriptsMigrated AWS CloudWatch to ElasticSearch and optimized logging with Fluent Bit- Automated DNS updates via external-dns and Route 53- Implemented wildcard DNS and Istio routing, reducing ELB costs from $226 to $4/monthBack-Office Frontend* Developed a Back-Office Frontend- Led frontend development (73.3% code contribution)- Created Figma-based UI mockups and TypeScript-based React Router v6 structures- Implemented a Data Fetcher Hook to abstract API calls and state management- Adopted fp-ts for functional programming practices- Established a scalable, maintainable, and efficient frontend environment* Built a Spring Boot-based API Server (contributed 54.1% of the codebase)- Implemented JJWT-based authentication with SecurityContextHolder and OncePerRequestFilter- Utilized @Lazy/@Transactional and Mockito @Spybean for clean architecture and testability- Incorporated Docker registry secrets, symmetric encryption, and OpenAPI 3.0 documentation- Developed QueryDSL-based fetch joins for efficient data access- Enabled Istio-based A/B/n testing and upgraded Helm charts to address traffic weight issues- Conducted Locust-based cluster load testing and performed comprehensive results analysis- Open-sourced the project with detailed installation instructions and documentation

* Served as the Core Full Stack Developer for an ML-based data labeling platform that automated image labeling, verification, and monitoring- Developed the frontend of the labeling system- Optimized Webpack builds from 46 seconds to under 4 seconds (11x improvement on M1 Pro)- Implemented a custom React hook to automate the issuance and renewal workflow of JWT Access and Refresh Tokens- Built a WYSIWYG editor with React-Konva, enabling users to view images and detected objects, and modify, delete, or create data structures directly on a Canvas- Developed a Django-based API server- Ported batch labeling tasks into Celery Worker Jobs, utilizing torch.multiprocessing.Pool for parallelization and asynchronous processing- Employed Channels and WebSocket protocols for real-time frontend updates during batch labelingResolved ORM N+1 query issues using select_related and prefetch_related- Containerized and integrated the open-source web crawler AutoCrawler with Celery and Docker, and adapted it to upload data through the Django ORM- Addressed ARM64 architecture compatibility problems with Ubuntu Chromium packages by contributing to a Stack Overflow solution and implementing the fix- Introduced incremental backend unit testing and property-based testing- Established a Kubernetes-based deployment environment- Automated deployment processes using GitHub Actions and kubectl- Containerized the test environment with Docker Compose on GitHub Actions

* Served as the Core Developer on vSOC (Vehicles Security Operations Center)* Served as the Core Frontend Developer on V2G PKI (Public Key Infrastructure for Connected Vehicles)