Heeju Ko
31, Hoam-ro 22-gil, Gwanak-gu, Seoul, 08812, Rep. of KOREA
(+82) 10- 4095- 1390 | pdsfk o@gma il.co m | www.yom echu. com | G oHJ7
Summary
Currently working as an Infrastructure and Backend Engineer at CareSquare, led the migration of in-house ser-
vices to Kubernetes and developed backend systems with Go, such as building REST API servers and task au-
tomation. Improved internal productivity by building deploying server and logging solutions. I am passionate
about infrastructure and backend development, and I love taking on new projects, solving complex challenges,
and continuously learning new technologies.
Education
POSTECH (Pohang University of Science and Technology) Pohang, S.Korea
Mar. 2017 - Feb. 2024
PSE Education Program Remote
Jul. 2023 - Oct. 2023
Work Experience
CareSquare Seoul, S.Korea
Jan. 2024 - Present
• Kubernetes Migration: Led the migration of internal services to Kubernetes, optimizing deployment pro-
cesses.
• Log System Developed a comprehensive logging solution using RabbitMQ and EFS.
• Backend Development: Built systems for chronic disease management and AlimTalk integrations.
Jan. 2023 - Mar. 2023
• Automation Development: Created a macro for patient management and registration at HIRA.
• Reverse Engineering: Analyzed the HIRA website to extract critical data for automation.
KnJ Corp Seoul, S.Korea
June. 2024 - July. 2024
• Website Server Development: Created a server for construction union members with a focus on stability and
robust session management to enhance user engagement.
• API and Responsive Design: Developed APIs for a bulletin board system and designed a responsive, user-
friendly main page layout, enhancing content management and user interactions.
CCBR (Center for Crypto Blockchain Research) Seoul, S.Korea
Jun. 2022 - Dec. 2022
• Risk Assessment System: Developed a Coin Risk Assessment System with Coinone, leveraging metrics like
ETH scan data to evaluate cryptocurrency risks.
• Blockchain Analysis: Analyzed multiple blockchain networks (Polygon, Avalanche, Tron, Optimism) to assess
and compare chain risks.
Projects
Kubernetes and RabbitMQ Integration (CareSquare)
• Stacks: EKS, Helm, Karpenter, RabbitMQ, EFS, Docker
• Migration & Scaling: Led the migration of microservices, APIs, and web servers from EC2 to EKS. Utilized Helm
and Karpenter for dynamic autoscaling, which optimized resource usage and reduced server costs by 50%.
• CI/CD Automation: Developed a CI/CD pipeline to automate builds, tests, and deployments, enhancing de-
ployment reliability and reducing deployment time by 80%. This automation minimized manual tasks and
errors, significantly boosting overall productivity.
• Logging & Monitoring: Created a centralized logging system with EFS and RabbitMQ, improving diagnostics
and reducing incident response times (MTTR). Enhanced operational oversight and troubleshooting eiciency.
• Performance Optimization: Implemented autoscaling and health checks across Kubernetes services for high
availability. Optimized Docker containers with Alpine images, enhancing performance and reducing resource
use.
Chronic Disease Care Project (CareSquare)
• Stacks: EKS, RabbitMQ, Go, Echo
• Cost Reduction: Developed a custom AlimTalk client, significantly reducing messaging costs by 50% com-
pared to third-party services, optimizing communication eiciency across the platform.
• Automation: Implemented Cron jobs and developed workers to automate the delivery of AlimTalk notifica-
tions and surveys, eiciently scaling the system to serve tens of thousands of patients weekly.
• API Integration: Engineered custom clients for seamless integration with Lotte Information & Communication
APIs, utilizing Goroutines to enhance API call eiciency and reliability across multiple hospital systems.
• Survey System: Built the survey API server, automating key processes in patient management and response
handling, thereby improving overall operational eiciency on EKS.
Image Crop Tool (CareSquare)
• Stacks: AppScript, AWS Lambda, PHP, Nginx, OpenCV, Python
• Achievements: Automated the cropping of 30,000 images in one month, cutting processing time by 70%
and enhancing the delivery of educational content.
• Automated Cropping: Used OpenCV to develop a system that detects and crops image boundaries, eliminat-
ing manual cropping and increasing throughput.
• Web Interface and Distribution: Created a Nginx-based web interface for verifying crops and employed AWS
Lambda to automatically compile and distribute images to Google Drive.
Landing Page (CareSquare)
• Stacks: EKS, ImageProxy, RabbitMQ, Go
• Achievements: Increased user acquisition by 30% through improved targeting and funneling from multiple
platforms. Reduced image load times to 10% of the original, enhancing user experience and cutting network
costs.
• Optimization and Tracking: Implemented user flow tracking with VWO and deployed an image cache server
using Image Proxy on Kubernetes, optimizing image handling. Integrated RabbitMQ for eicient data flow and
logging.
Extracurricular Activities
PoApper (Developers’ Network of POSTECH) Pohang, S.Korea
Jun. 2017 - Mar. 2018
• Course Registration System: Developed the university’s course registration website, including login function-
ality and course schedule APIs, improving service reliability and user experience for campus members.
Ethereum Foundation ZK Seminar Remote
Jul. 2023 - Aug. 2023
• zk-SNARKs Study: Explored zero-knowledge proofs with a focus on zk-SNARKs in Ethereum and presented on
circuit conversion techniques.
Skills
DevOps AWS, Docker, Elastic Kubernetes, Helm, RabbitMQ
Back-end Echo
Programming Go, Python, Js
Languages Korean, English
