Info
⭐ Jinyoung Song (송진영)
🎁 25th Mar 1998 Republic of Korea
🇰🇷 Korean
✉️ Email : [email protected]
Link
👩🏻💻**GitHub** ✍🏻**Blog** 🔗**LinkedIn**
📋**Resume** 📝**Portfolio_kor**
I consider UI that looks good and UX that is good to use,
I focus on clean code,
I pursue continuous growth to become a better me.
Consideration, Communication and Improvement.
Three most Important values for me.
- I always consider new and better approaches to reach goals.
- I believe, that working together through continuous communication to find solution leads improvement, not only my own but the whole team as well.
🛠️ Tech Stack
📕 Language Typecript Javascript Python
📙 Framework / Library React Next.js React Native
📗 MarkUp / Style HTML CSS SCSS Styled-Component emotion tailwind
📘 Tools Git Agile Waterfall Jira Trello Notion Figma Zeplin
👩🏻💻 Career
Rabot Charge
B2B, B2C platforms for smart electricity billing
03.2024
Frontend Developer - ****Full-Time
React Typescript Styled-Component
- Independently designed and executed a full a11y strategy, raising the Lighthouse score from 76 to 100 and achieving zero errors in WAVE and axe DevTools across the conversion funnel, 3 shared packages, and the dashboard.
- Built a 4-layer automated a11y enforcement system within the monorepo CI pipeline, making BFSG compliance a team-wide default and preventing accessibility regressions before deployment.
- Conducted a comprehensive security audit across 5 deployables and the WordPress stack, eliminating application CVEs (114 → 0) and reducing container OS CVEs by 97% (315 → 9); cataloged 1,664 infrastructure vulnerabilities with a structured remediation plan.
- Built the Frontend Chapter foundation from the ground up — introduced Operating Model, Topic Workflow, and Proposal Templates; standardized cross-board JQL and labeling structure to improve transparency and cross-team collaboration.
Junior Frontend Developer - ****Full-Time
React Typescript Styled-Component
- Reduced frontend bug rate by 54% (from 5.6 to 2.6) through stronger QA processes, rigorous code reviews, and increased unit and end-to-end test coverage.
- Improved sprint velocity predictability from 43% to 74% by restructuring ticket sequencing and incorporating historical sprint analysis into planning.
- Reduced partner list fetch time from 3 seconds to 0 using a cron job optimization.
- Owned the Prepayment Settings feature from planning to delivery — structured tickets for parallel development and collaborated with backend and mobile engineers to define and validate API requirements.
- Led end-to-end delivery of multiple features including Multi-Tariff, iMSy Order, and New Customer Bonus, adapting to unplanned requirement changes without impacting delivery schedules.
- Optimized tariff hydration logic to trigger only on consumption input changes, reducing redundant API calls from ~30 to once per user session.
- Refactored the shared codebase to support dynamic tariff key handling, improving maintainability and reducing technical debt.
MostX
Shopping platform that products are customized for user’s lifestyles
08.2023 ~ 02.2024
Frontend Developer - ****Freelancer
Next.js Typescript MobX Tailwind
- Increased readability by structuring components according to purpose and succesfully shared state value among these pages by using redux on category admin page
- Reduced unnecessary API calls by prefetching data on popular-search list
- Elevated user experience by developing search autocomplete feature using debounce
- Implemented a query string hook to persist user-selected data, ensuring data retention even when the browser is refreshed
- Optimized development by utilizing server components, local-storage hook and scalable common components
- Cooperated with backend developer, search engineer, designer and project manager
Petaverse
Community services for pets' owner.
05.2023 ~ 06.2023
Frontend Developer - ****Freelancer
React Typescript Styled-Component
- Collaborated closely with a designer and project manager using tools like Slack and Figma to ensure seamless communication and effective coordination.
- Designed and developed a captivating landing page for the Pawsely service, aligning with the brand's visual identity and user experience guidelines.
- Implemented scroll animations to enhance user engagement and crafted a responsive and scalable interface to provide an optimal browsing experience across various devices.