LOTTE Innovate·Frontend Engineer
Aug 2024 – Present · Seoul
IT subsidiary of Lotte Group, building fan engagement platforms for Korean sports and entertainment IPs (FC Seoul, FC Anyang, Suwon Samsung).
- Payment Module · Engineered a unified payment module by formalizing a 5-stage payment flow and 10 error types across PC (iframe) and mobile (redirect), reducing per-brand integration code from 2,300 to 30 lines and effort from 3 days to 1 hour.
- Quality Automation · Built end-to-end payment testing (Playwright + MSW) with AI-assisted reporting, cutting equivalent QA from 3 hours to 2 minutes and catching 10 bugs before release.
- System Design · Established a 3-Layer CSS token architecture with utility mapping for a 10+ brand platform, reducing duplicated brand-specific UI code by 83% and new brand onboarding from 1 man-day to under 1 hour.
- Experimentation · Engineered a feature-flagged A/B test with a 7-event GA4 conversion funnel, keeping tracking intact across a multi-app login flow.
- Architecture · Designed a declarative UI architecture using the Builder Pattern, reducing implementation time by 87% (1 day → under 1 hour).
- Performance · Optimized sprite-based effects with a two-stage Sharp compression pipeline, reducing asset size by 75% (8MB → 2MB).
- DX · Rolled out a Feature Flag system with AI-assisted Git automation, cutting hotfix rate from 15.4% to 0%.