Frontend is a set of Play Framework 2 Scala applications that serves as the backend for the Guardian website frontend.
The project solves the problem of efficiently rendering news content at scale by building JSON responses that feed into a modern rendering service called Dotcom Rendering. Its approach enforces strict performance and architectural constraints: every request must be cacheable with appropriate headers, each request performs only one backend I/O operation, average response times stay below 500ms, and requests exceeding two seconds are terminated. The codebase uses make for client-side asset builds and SBT for the Play Framework backend, with comprehensive documentation covering architecture, setup, deployment, and development practices.
Frontend suits organizations building high-traffic news or content platforms where performance and cacheability are non-negotiable. The strict architectural principles—single I/O per request, aggressive timeout enforcement, mandatory cache headers—make it most appropriate for teams willing to design around these constraints rather than work around them. The project is production-grade, powering theguardian.com itself, and includes detailed setup guides and troubleshooting documentation for new developers.
The project maintains a substantial base of external adopters who report issues regularly, indicating real-world production use beyond the core team. Maintainers typically respond to new issues and pull requests within a few days. Work in the issue tracker centers on A/B testing infrastructure for headlines and articles, along with efforts from the WebX team, suggesting active experimentation and feature development focused on audience engagement and testing capabilities.
