Build vs. buy: how to build agent infrastructure yourself

Creating a web agent capable of operating at scale involves more than just deploying a browser; it requires establishing a complex infrastructure comprising warm pools, isolation, identity recognition, observability, and a model gateway, each of which presents unique challenges and maintenance demands. While a single browser can be easily set up using open-source tools like Chromium and Playwright, scaling up to thousands of browsers introduces significant complexity, such as managing identity signals to avoid detection by websites, ensuring session isolation to prevent security breaches, and maintaining observability for debugging purposes. Additionally, these systems need to be continuously updated and patched, particularly given the frequency of security vulnerabilities in browsers like Chromium. The decision to build this infrastructure in-house versus purchasing it as a service should be carefully considered, as building it can consume significant engineering resources and divert focus from core product development. The text argues that building such a system is justified primarily when it is directly tied to the company's product offering or strategic goals, otherwise, leveraging existing services might be a more efficient approach.

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