Serverless programming revolutionises the implementation of cloud architectures by allowing developers to deploy stateless functions without managing server infrastructure, enabling efficient scaling and resource usage. Serverless shifts to the cloud provider the burden of managing servers and scaling, enabling developers to focus solely on writing the code for the functionalities specific to a given architecture. In this paper, we introduce Fenrir, a programming framework designed to facilitate the transition from monolithic programming to serverless. Fenrir enables developers to write applications in a monolithic style. Using annotation, users specify which components of the monolith shall implement separate serverless functions. Given these annotations, Fenrir generates a deployable serverless codebase, facilitating quick development and testing cycles while ensuring the alignment of the execution semantics between monolithic and serverless code.