Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.

Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.

Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.

Yandex.Metrica is a free web analytics service that tracks and reports website traffic.

Varnish is a reverse caching proxy.

Amazon Web Services (AWS) is a comprehensive cloud services platform offering compute power, database storage, content delivery and other functionality.