Fastly

Fastly is an enterprise-grade edge cloud and CDN platform built for engineering-heavy organizations that require fine-grained control over edge delivery, caching, routing, security, and observability. The platform combines global CDN infrastructure, programmable edge logic through Varnish Configuration Language (VCL) and Compute@Edge, advanced logging pipelines, API acceleration, DDoS protection, web application firewall services, and real-time image optimization.

Fastly is widely used by media companies, ecommerce platforms, SaaS providers, streaming services, and API-first organizations that depend on low latency, high cache hit ratios, and programmable infrastructure close to end users. One of Fastly's biggest differentiators is its VCL tables and dictionaries system, which enables teams to manage routing rules, feature flags, redirects, personalization, and edge behavior dynamically without redeploying services.