Hello, I'm Hyojin (Jean) Kim, a Backend Engineer with a strong foundation in project management and system analysis. I specialize in analyzing legacy systems and thrive in tackling new, complex challenges.

👩‍💻 Development
I believe maintainability is crucial. I strive to provide reliable services by carefully considering the roles and responsibilities of domains and architecture.

💼 Work Ethic
I value predictability. I build trust with coworkers through clear scheduling, structured design, and reliable development practices.

👥 Company Culture
I believe in active participation in company culture. I foster a healthy work environment through constructive communication, a continuous interest in service improvements, and a supportive attitude.

I primarily work with Spring and Kotlin, but I prioritize fundamental concepts and leverage frameworks and languages as tools to build effective solutions.

✔︎ Backend For Frontend Server Development and Operations for 아이들나라 (KidsWorld) (Oct 2024 – March 2025)

• Operated BFF Server in Microservice Architecture.
• Improved response time using the CQRS pattern and caching techniques.

✔︎ Content Search Service Development and Operations for KidsWorld (Feb 2023 – March 2025)

• Developed typo correction and initial consonant search functionality using OpenSearch.
• Implemented semantic search through Hybrid Search
• Reduced search failure rate from 16% to 1% through metric-driven tuning.

✔︎ CMS Development and Operations for KidsWorld (Jul 2023 – Oct 2024)

• Developed a Content Management System (CMS) to manage over 100,000 content items
• Reduced content playback errors by 97% through AWS DMS & Kafka-powered domain migration and synchronization.

✔︎ Message Platform Development and Operations for KidsWorld (Apr 2024 – Oct 2024)

• Developed a SNS notification service using external services
• Created an email sending system leveraging AWS SES, SNS
• Optimize sending latency by decoupling the sender module.

✔︎ Quiz Domain Legacy Server Migration for KidsWorld (Nov 2022 – Jan 2023)

• Reduced deployment time from 1 month to 1 week by migrating Lambda to Spring Boot (Kotlin).
• Executed a zero-downtime migration with API Gateway, ensuring data consistency.

✔︎ Learning Report Automation Project for KidsWorld (Feb 2022 – Nov 2022)

• Developed an automated report generation system using Spring Batch, DynamoDB, and SQS.

✔︎ Experimental Web Page for Content Search

• Developed a content search web service using React, Next.js, Recoil, Styled Components.
• Increased subscription page CTR by 11% through SEO optimization.
• Demo Page

✔︎ Project Manager for KidsWorld App Development (Jan 2022 – Jan 2022)

• Managed the development of the OTT service app "KidsWorld," targeting infants and toddlers
• Supported the development of interactive content for coding education

✔︎ Project Manager for ElementaryWorld App Development (Oct 2019 – Dec 2021)

• Managed the development of the "ElementaryWorld" app, a homeschooling service targeting elementary school students
• Oversaw 3rd party app integration and learning management service development
• Discovered and implemented a feature to measure learning concentration using eye-tracking technology
  
  

I am passionate about maintaining a healthy body and mind through activities such as

• 🎸 Guitar
• 🧘‍♀️ Yoga
• 🤿 Free Diving
• 🧗 Climbing
  
  

• Resume
• LinkedIn
• Blog