IT Operations · Engineering, IT & AI
Should you build or buy Edge Serverless / FaaS Platform?
Edge Serverless / FaaS (Function-as-a-Service) platforms execute short-lived JavaScript or WebAssembly functions at distributed edge locations worldwide — letting developers run custom logic close to users for authentication, request routing, personalization, and API responses without managing servers or waiting for round-trips to a central origin.
The build-vs-buy decision for Edge Serverless / FaaS turns on the irreplaceable physical edge network — you can build the function runtime, but you cannot build the global point-of-presence distribution that makes edge compute low-latency; this decision has been stable for years.
Build it, buy it, or bridge?
When building makes sense
The honest build case for edge serverless is narrow: it only applies if you're deploying to your own infrastructure and don't need the edge latency advantage. OpenFaaS and Knative are mature function runtimes you can self-host on Kubernetes, and they work well for internal event-driven compute that doesn't require geographic distribution. If your requirement is 'run code close to users in 100+ countries,' the build path doesn't exist — that requires a global network of data centers, peering agreements, and years of operational investment that no application team can replicate. For teams moving away from an edge provider for cost or control reasons, the only sensible path is evaluating alternative edge providers, not building the edge network layer themselves. Self-hosted FaaS makes sense only when the 'edge' in edge serverless isn't actually your requirement.
When buying makes sense
Buying edge serverless is the straightforward choice for any team that needs code running close to users globally. The edge platform is the product — Cloudflare's 300+ PoPs, Fastly's CDN backbone, and Deno Deploy's distributed runtime give you global execution that a self-built solution couldn't approach. The pricing is already near-commodity: Cloudflare Workers charges $0.50 per million requests on the paid plan, which is difficult to beat even with free compute. Platform lock-in is the real tradeoff to evaluate — edge function APIs differ meaningfully between providers, and migrating complex Cloudflare Workers logic to Fastly Compute requires rewriting. Teams that expect to run substantial edge compute long-term should think about portability when writing functions, not as an afterthought. For most use cases — auth, routing, personalization, A/B testing — any of the major platforms is a reasonable default.
The desk read
Cloudflare Workers and Fastly Compute aren't selling you a function runtime. They're selling you proximity to end users across 300-plus global locations, with latency profiles that centralized compute can't match regardless of how well you optimize. Replicating that physical distribution is outside what any application team can build.
Buying is straightforward for any use case where edge latency matters. The programmable layer, routing logic, personalization, auth at the edge, A/B experimentation, is the differentiated part, and those functions run on top of infrastructure you couldn't build. Deno Deploy and Vercel Functions offer a friendlier deployment model if Cloudflare's configuration surface is more than your team needs. The build conversation mostly applies to the function code itself, not the runtime.
Vendors in Edge Serverless / FaaS Platform
Each file covers what the product is, its funding history, and when the index last verified it alive.
Frequently asked
What is an Edge Serverless / FaaS Platform?
Edge Serverless / FaaS platforms execute short-lived JavaScript or WebAssembly functions at distributed edge locations worldwide — letting developers run custom logic close to users for authentication, request routing, personalization, and API responses without managing servers or waiting for round-trips to a central origin.
When does building an Edge Serverless / FaaS Platform make sense?
Building only applies if you're running entirely on self-hosted infrastructure and don't need geographic edge distribution. OpenFaaS and Knative work for internal event-driven compute, but they don't provide edge latency — that requires a global PoP network no team can replicate.
When does buying an Edge Serverless / FaaS Platform make sense?
Buying makes sense for any team needing code close to users globally — the edge network is the product, and you can't build that. Cloudflare Workers pricing is already near-commodity, making the economic case for buying straightforward.
What are the main Edge Serverless / FaaS Platform vendors?
Representative vendors include Cloudflare Workers, Deno Deploy, Fastly Compute, Vercel Functions, Netlify Functions. B4 Pro scores the full set.