When building an app or software, one of the most crucial factors to consider is the product's scalability. When a system does not need to be modified to retain effective performance during or after a significant increase in workload, which is said to be scalable. This development strategy allows for future growth while also generating a smaller product that suits current demands without increasing complexity. There are various factors that must be considered in order to achieve a scalable design:  

 Usage - A well-designed system should not have any arbitrary limitations on the number of users or connections it can support.  

Maximum data storage - The amount of data kept by initiatives like data science or sites with a lot of unstructured data could grow quickly and unexpectedly. In software architecture, ensuring data storage scalability is essential. 

 Code - Should be written in a way that it may be expanded or modified without needing to be refactored. By eliminating unnecessary duplication, one can lower the overall size and complexity of the codebase. 

 Scaling Out vs. Scaling Up - Both strategies have advantages and disadvantages depending on the final desired goal and/or any additional constraints (such as time or money budgets). Scaling up, for example, is not suited for software that has to expand quickly, and scaling out can limit the speed with which servers communicate or the messaging and the capacity of the integration layer.