Hi, I'm Hogeun Lee, β a 4th-year Computer Science student passionate about architectural trade-offs, robust server-side technologies, and cloud infrastructure.
- Soongsil University β B.S. in Computer Science Engineering | Spring 2021 - Present
- Illinois Institute of Technology β Visiting Student in Computer Science | Spring 2026
Languages & Backend Frameworks
Databases, Brokers & Search Engines
Cloud & DevOps
Monitoring & Observability
Hama Lab Co., Ltd., Backend Developer | SEP 2026 - Present
- Performing an internship as a developer on the backend team
- Key work: Designed and implemented backend APIs for two global services (education / dating)
- Ensured data consistency under concurrent requests with CAS-based idempotency and transaction separation (
REQUIRES_NEW) - Designed a Master-Slave DB routing architecture across the Singapore and Seoul regions, guaranteeing read-after-write consistency based on measured latency data
- Built a PrometheusΒ·Loki-based observability stack to visualize API and DB metrics, driving data-backed performance decisions
- Built data review and generation pipelines for the services, reducing review and generation time
- Ensured data consistency under concurrent requests with CAS-based idempotency and transaction separation (
Soongsil University IT Support Committee, Backend Developer | AUG 2026 - Present
- Maintaining backend features of the student council homepage
- Owned the student-side features of PASSU V3, a digital receipt service, developing and deploying new features
- Key work: Revamped u-Saint OCR verification and migrated the legacy monolith to a Go-based serverless architecture
- OCR failure rate 32.8% β 0%: Benchmarked 4 recognition engines under identical conditions and switched to PP-OCRv5 with a structure-based parser
- 5xx rate 6.67% β 0.29% and 73% higher throughput at 1,000 concurrent users: Identified the bottleneck as DB connection count rather than DB performance, and resolved it with reserved concurrency
- ~97% annual cost reduction vs. always-on servers (estimated): Serverless design with a self-hosted OCR model β reading 15,000 users costs about $1.6
CJ OliveNetworks AI CAMPUS β AI CLOUD WAVE (1st Season) | JUN 2026 - AUG 2026
- Completed an intensive 10-week, 400-hour tech program focused on enterprise AI cloud infrastructure
- Learning areas: Networking Β· Linux server operations Β· AWS infrastructure Β· Container and Kubernetes operations Β· Observability Β· AIOps-based anomaly detection Β· LLM/RAG/Agent utilization for operational automation
- Attended practical lectures by CJ OliveNetworks practitioners and career placement sessions
- Project: Completed a 3-week project on AI-based cloud operations analysis and decision support
Illinois Institute of Technology (IIT) Tech Community | JAN 2026 - MAY 2026
- Association for Computing Machinery (ACM) (Member) : Regular tech seminars and Scarlet Hawks hackathon
- Google Student Developers (Member) : Google AI workshop
- Machine Learning Club (Member) : LLM workshop and LeetCode problem-solving sessions
UMC (University MakeUs Challenge) β Soongsil Univ. Chapter | SEP 2024 - FEB 2026
- 9th (Spring Boot Part Leader): Hosted framework study sessions, led backend code reviews, and speaker at chapter tech seminars.
- 8th (Spring Boot Part Senior): Completed advanced backend workbooks and participated in core server-side development and studies.
- 7th (Spring Boot Part Challenger): Studied production-ready Spring Boot fundamentals and successfully shipped full-cycle team projects.
KUSITMS(Korean University Students IT, Management Society) 32nd, Backend Part | AUG 2025 - DEC 2025
- Industry-academia project with LG Electronics (Backend Part)
- Completed a 3-month cross-functional team project across PM, design, and development
- Expert lectures and talks from industry professionals
CES 2025 (Consumer Electronics Show), Las Vegas, USA | JAN 2025
- Attended & Report Authored
'Exploring Future Trends in AI and FinTech Innovations' (Exhibition Visit, Networking & Report Writing)
OceanSoft Co., Project Manager | JUN 2024 - SEP 2024
- Worked at SI Outsourcing Company.
- Managed development lifecycles, structured client requirements, and scheduled component deliveries.
SSCC (Soongsil Central Computer Club) | MAR 2024 - AUG 2026
- Participated in technical book clubs, AWS cloud infrastructure studies, and team software hackathons/competitions.
Soongsil Univ IT College Student Council, Planning Director | JAN 2024 - DEC 2024
- Directed major student body activities, organized chapter tech seminars, and managed large-scale community events.
SPLUG (Soongsil Power Linux User Group) | MAR 2021 - DEC 2021
- Studied C-based Linux core systems and contributed to academic advancement through seminar presentations.
CJ AI Cloudwave Cohort 1, PM & Full-Stack Developer | AUG 2026
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Award: CJ Olive Networks AI Cloud Wave Cohort 1 β Excellence Award, AUG 2026
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Overview: Designed and built an AIOps pipeline β from observability and ML-based anomaly detection to AI agent diagnosis β on a simulated MSA replica of the Olive Young Global flash-sale service
Backend/Frontend Β· Observability Agent Β· Load Test Design Β· ML-based Incident Detection
Directed architecture across 8 repositories, tracked through 63 logged design decisions for fully parallel team development
Cut recurring alert noise 94% (32 β 2) by rewriting mis-firing monitoring rules
Designed a 36-hour load test peaking at 4,250 rps with a region-derived dual-peak traffic curve
Raised ML anomaly-detection recall 3x and cut false positives 7x through algorithm tuning
Cut repeat-incident diagnosis latency up to 169x with a signature-based verdict cache
Team ASSU, Full Stack Developer (Android + Spring Boot) | MAY 2025 - Present
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Award: Soongsil University IT Project Competition (Service Launch & Operation), NOV 2025
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Overview: All-in-one partnership management platform between university students and local businesses (Play Store Link)
Led the entire lifecycle, from service ideation and development to over a year of live service operation
Developed the Android app based on MVVM architecture
Implemented 4-role RBAC with Spring Security and built a back-office admin environment
Set up production CI/CD with k3s and ArgoCD
Built monitoring with Grafana Alloy and Grafana, with integrated alert rules enabling rollback-based remediation within 10 minutes
Team Starlight, Backend Developer | OCT 2025 - SEP 2026
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Award: KUSITMS 32nd Best Prize
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Overview: Business plan platform for early-stage startups (Web Link)
Introduced hexagonal architecture
Built supervisor-agent and RAG-based report generation with Spring AI
Contributed to the Spring AI open-source repository (Issue #4754)
Designed for reliability using the Circuit Breaker pattern
Reduced report generation time by 40% via parallel agent execution with Java threads
Cut API calls by 90% and improved average query speed by 15% through query analysis
Team Clokey, Backend Developer | JAN 2025 - JUN 2026
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When: UMC 7th Demoday Project
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Overview: Smart closet management service (App Store Link)
Built multi-module DDD architecture
Designed Spring Boot APIs with Flyway for database migrations
Provisioned AWS infrastructure with Terraform for easier server migration
Integrated and optimized Elasticsearch and MeiliSearch; tuned search accuracy (reduced zero-result queries by 45% after Nori + synonym tuning)
LG x KUSITMS Industry-Academia Collaboration | SEP 2025
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Award: Best Practice Award
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Overview: LifeZip improvement project β serverless image optimization for a lifestyle platform
Designed Spring Boot APIs
Built a serverless image optimization pipeline, reducing resource usage by 90%
Spartan Winning Startup Camp (Unithon), Soongsil University | AUG 2025
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Award: Excellence Award; Soongsil University 2025 Pre-Startup Incubation Program
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Overview: Online attachment doll-based child psychological counseling and care service
Full-stack development with Next.js, Spring Boot, and FastAPI
Built real-time communication with STT/TTS (ElevenLabs)
Implemented emotion analysis from video processing (DeepFace v0.0.83)
Team HaRu, Backend Developer | JUL 2025
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Award: UMC 8th Demoday Project β Special Prize
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Overview: All-in-one operation management platform for small teams (Web Link)
Developed Spring Boot API server
Built Google Forms-style response forms with unauthenticated token-based access
Containerized AI server with Docker and set up CI/CD
Soongsil University Software Competition | JUL 2025
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Award: 1st Place (Gold Prize)
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Overview: Handwriting archiving web service with OCR-based text preservation for personal letters and memories
Full-stack development with Next.js and Spring Boot
Implemented async processing between AI and main servers using RabbitMQ
ICT English Project Presentation Contest | DEC 2024
- 2nd Place
'The Dark Side of Military Artificial Intelligence: Risks and Ethical Concerns' (Presentation)
SPLUG Seminar Achievement, Soongsil University Linux Computer Science Club | NOV 2021
- 2nd Place
'Unity: 2D game programming' (Seminar Presentation and Code Cloning)
- Engineer Information Processing, Human Resources Development Service of Korea | SEP 2026
- AWS Certified Solutions Architect β Associate (SAA-C03) | AUG 2026
- TOPCIT(Test of Practical Competency in IT) β Score 752 β’ Level 4 (Proficient) β’ Problem-Solving Track | MAY 2026
- AWS Certified AI Practitioner (AIF-C01) | SEP 2026
- AWS Certified Cloud Practitioner (CLF-C02) | OCT 2025
- SQL Developer, Korea Data Agency | SEP 2025
- Craftsman Programming, Human Resources Development Service of Korea | JUN 2023
