As a Senior Back-end Developer specializing in Node.js, I offer expert services in building robust, scalable, and high-performance server-side applications. My services include designing and implementing RESTful and GraphQL APIs, optimizing database queries and application performance, integrating third-party services, and setting up cloud infrastructure on AWS or Azure. With extensive experience in frameworks like Nest.js and libraries such as Apollo, I can develop efficient microservices architectures, implement secure authentication and authorization systems, and create background processing solutions using technologies like RabbitMQ. My focus is on writing clean, maintainable code that adheres to best practices and delivers tangible business value through improved performance and reduced operational costs.