Prateek Surana

Credit Card Pipeline: Built Go based microservice infrastructure for Credit Card Pipeline processing 10M+ emails/month across 100K+ cards. Improved CPU usage by 70% using a pub/sub architecture and in-memory caching. Scheduled Processing Services: Built high-throughput notification and email systems serving 100K+ users, delivering millions with <100ms latency using SQS queues and EventBridge schedulers. In-App Purchase Service: Built Go microservice processing App Store and Play Store webhooks with <100ms latency. Implemented periodic reconciliation as fallback to ensure zero payment discrepancies. Recurring Expenses System: Designed PostgreSQL schema and built Go APIs and microservice for rule-based expense tracking. The system automatically linked bank and card transactions to user expenses with real-time notifications, improving retention by 20% through clearer spending insights.

API Optimization: Consolidated frequently-accessed data into a single cached endpoint in Node.js using Redis, reducing page load API calls by 40% and improving response times to <60ms for critical user data. Discord Bot: Added Discord OAuth login on the frontend and built a Node.js bot using Discord APIs to automate tasks like creating private hackathon channels and assigning roles, improving average support time by nearly 50%. TypeScript Migration: Led the incremental TypeScript migration initiative with a team of 2 engineers, establishing guidelines for new React components and linting rules that reduced runtime errors tracked in Sentry by 95% over 6 months. Next.js Migration: Led a team of 2 engineers in redesigning and incrementally migrating from custom Webpack setup to Next.js with a dual runtime architecture. Reduced load times to <80ms for top pages using SSG while maintaining backward compatibility for old pages and doing a staggered rollout using feature flags.

Authentication Migration: Rebuilt auth from localStorage tokens to secure HTTPOnly cookies, improving security against XSS attacks and enabling authentication across subdomains. Bundle Size Optimization: Implemented Rollup builds for the design system, reducing bundle size by up to 90% using tree-shaking and ESM output. Test Suite: Built testing stack using React Testing Library, Cypress, and Chromatic for visual regression testing.

Contributed to core product features including customizable application forms and an in-house markdown editor, leading to conversion to full-time Frontend Engineer role.