Developed and maintained important features for the application within the advertising and visual content display sector, utilizing a full-stack approach encompassing front-end and back-end development. Key contributions include: Front-End Development (React, TypeScript): Designed and implemented responsive, interactive user and administrator interfaces using React and TypeScript. Integrated with various cloud services (AWS, Google Cloud, Azure) including AI/ML APIs (OpenAI, Google Gemini, Azure Vision) for image recognition, translation, and intelligent recommendations. Back-End Development (Node.js, GraphQL, MongoDB): Built and maintained scalable and efficient back-end services using Node.js (Express/Koa), GraphQL (Apollo Server), and MongoDB. Developed and optimized GraphQL schemas and resolvers, improving data retrieval performance. Data Management & Search: Implemented robust data management solutions using MongoDB, leveraging Elasticsearch and Algolia for optimized search and retrieval. Utilized Redis and BullMQ for caching and queue management to enhance application speed and efficiency. Media Integration & Processing: Integrated Adobe Stock and Shutter Stock APIs for media asset acquisition. Leveraged AWS services (S3, MediaConvert, IAM) for asset storage, transcoding, and video processing. Testing & Quality Assurance: Conducted thorough unit testing (Jest) and ensured robust GraphQL mutation handling for optimal HTTP request performance. Proactively identified and resolved bugs to maintain application stability.