• Reduced initial page load from ~50 API calls to 4–5 by designing batched backend APIs in Node.js and Express, fetching rooms, tables, cards, and decks together in structured chunks for faster and more reliable loads.
• Led a frontend and backend migration from JavaScript to TypeScript across Ember.js and backend services, preventing ~90% of production bugs by catching integration and runtime issues earlier through typed contracts.
• Improved content loading performance by introducing a CDN caching layer via Cloudinary and storing derived image metadata for cards and decks, reducing repeat fetches and speeding up browsing.
• Built fine-grained access controls for user content, supporting public items, user-specific sharing, and collaborative tables, while keeping private data strictly isolated.
• Strengthened platform security and developer confidence by adding CSRF protection, enforcing a strict Content Security Policy (CSP), and stabilizing broken test suites and CI pipelines so fai
