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Serverless & WebAssembly

Serverless computing, also known as Function-as-a-Service (FaaS), has revolutionized the landscape of cloud computing by abstracting away the complexities of server management and maintenance. This paradigm allows developers to focus solely on writing and deploying code, enhancing efficiency and productivity.

In the serverless model, applications are broken down into distinct functions, each of which is triggered by specific events such as changes in a database, requests to an API, or updates to a file in a storage system. When the respective event occurs, the function is executed. Otherwise, the function remains dormant, making serverless computing cost-effective as charges are incurred only for the computing resources consumed.

The benefits of serverless computing include:

  • Operational Simplicity: Eliminates the need for server management, allowing developers to focus on the code.
  • Cost-Effective: Since you only pay for the compute time you consume, serverless can be more cost-efficient than provisioning and managing servers.
  • Scalability: Serverless applications can scale automatically in response to demand. Each function operates independently, so a surge in demand for one function does not affect the performance of others.


WebAssembly (wasm) is a binary instruction format that operates as a stack-based virtual machine. It was designed to be a portable target for the compilation of high-level languages such as C, C++, Rust, and Go, enabling the deployment of web and server applications on a variety of platforms.

WebAssembly brings several advantages:

  • Performance: WebAssembly code executes at near-native speed by taking advantage of common hardware capabilities available across different platforms.
  • Portability: The compact binary format of WebAssembly is designed to be efficient for browsers to download and for machines to parse and execute.
  • Security: WebAssembly is designed to run safely on sandboxed environments, providing a secure way to run applications.

Combining Serverless and WebAssembly

The combination of serverless computing and WebAssembly provides a highly efficient, secure, and scalable computing model. Applications can scale on-demand based on the number of triggering events, and the compact binary format of WebAssembly allows for quick startup times, mitigating the cold start problem typically associated with serverless computing.

The integration of these two technologies provides benefits such as:

  • Enhanced Performance: The use of WebAssembly in a serverless environment can improve function startup times due to its compact binary format.
  • Scalability: Serverless computing’s inherent scalability combined with WebAssembly’s execution efficiency can handle fluctuating demand effectively.
  • Security: Functions compiled to WebAssembly can be executed in isolation, providing an additional layer of security.
  • Cost Efficiency: The event-driven nature of serverless computing, coupled with the efficient execution of WebAssembly, can lead to significant cost savings.


The merger of serverless computing and WebAssembly offers a promising pathway for the future of cloud computing. This combination provides a highly scalable, cost-effective, and secure computing environment, where developers can focus on crafting code while the system takes care of execution efficiency, scalability, and resource optimization. As these technologies continue to mature, we can expect to see more innovative applications that leverage their combined strengths.