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