Sejin Kim

At The Realry Group (Aeris), I cut a production MongoDB catalogue query from 157,850 ms to 5.37 ms by replacing a full count with an existence check, avoiding a new index on a multi-hundred-GB collection.

I built a production recommendation system as sole author, combining BigQuery ML training with Python/FastAPI inference, ALS fold-in, FAISS retrieval, and Redis serving for the Laravel storefront.

I replaced a founder-run manual email process with an in-house campaign platform and implemented GDPR export and erasure, including six idempotent anonymisation services. I also removed bearer tokens from storefront HTML and added tests and CI checks to prevent fixed defect classes from returning.

At Inowing Co., Ltd., I built and ran PHP/Laravel platforms for learning, virtual events, real-time interaction, document generation, and email delivery. I also built an authenticated-user LMS used in 70+ countries and handling 40M+ CDN-served requests in one month. On my Verata project, I’m building real-time medical speech translation for clinics, from the Node.js audio engine to a Laravel control plane.