- Spearheaded the implementation of an AI-driven response system for buyer-seller communication using OpenAI APIs, automating 90% of replies and significantly reducing response times and manual intervention.- Led the development of a Customer Identity Verification service that automated and improved fraud detection accuracy, leveraging external APIs, caching solutions, and AWS technologies (Lambda, DynamoDB, EventBridge, SQS, API Gateway) to provide efficient, reliable identity checks.- Integrated and maintained payment processor connections and data reconciliation processes (Shopify, Stripe, PayPal, and other APIs) using AWS Lambda and AWS Step Functions, ensuring system reliability and scalability.- Participated in the migration from legacy AWS EC2 servers to AWS Lambda, enhancing scalability, optimizing resource management, and reducing infrastructure costs.- Designed and implemented end-to-end features in Node.js, TypeScript, and React, applying functional and object-oriented principles with Inversion of Control (InversifyJS) and unit testing via Jest and Mocha.