Vanessa Loh Jia Ying

Owned performance-critical trading flows in a React Native mobile app using live websocket data for order entry, market data streaming, and responsive order editing. Migrated order fetching from Redux to TanStack Query, refactored order-size calculations into shared memoized utilities to reduce per-tick re-renders (validated with React Profiler), and added tests across contract types, increasing mobile’s share of total order volume from 2% to 5%. Refactored a large order form into shared calculation utilities and reusable UI components, using useDeferredValue to keep inputs responsive and updating TanStack Query cache directly from websocket messages. Led a KYC onboarding overhaul (consolidating verification with Sumsub, reducing screens, splitting logic into tested hooks), improving daily signup drop-off by 10%. Investigated and helped mitigate an Android ANR on a live price chart caused by an off-screen WebView continuing its render loop and websocket feed, contributing to bringing

Diagnosed scaling risks from duplicated API logic and deeply nested navigator stacks, then drove an architecture overhaul by redesigning navigation and implementing a shared auth-token renewal utility; the pattern was adopted app-wide to replace legacy module code. Architected a config-driven analytics package that loads event schemas per app context and enriches events with session-persisted user data before dispatching to Firebase, enabling teams to adjust tracking via config instead of frontend changes. Redesigned the bills-and-payment flow to reduce user friction and cut GIRO setup time from 2 weeks to 15 minutes. Redesigned plan-and-contract details for clarity and accessibility, reducing roughly 1,000 support calls and saving about $5,000 monthly.

Led a team of 2–3 engineers, mentoring new members, running code reviews, and supporting product feasibility studies and technical design reviews. Built high-traffic item cards to improve user engagement. Delivered reusable UI components to Shopee’s shared library used across product teams, including development of search-result item card features such as automatic fashion image playback.