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When developing Software as a Service (SaaS) products, an important consideration is the isolation model used to restrict cross-tenant access. Many legacy applications utilise a siloed architecture that physically or virtually separates resources. However, a pooled isolation model offers greater flexibility and agility when it comes to developing and deploying your application. By leveraging serverless AWS services, an agile but secure architecture can be achieved.

When modernising legacy systems, a key issue is figuring out how to migrate your existing data into a database that has been remade from the ground up. Rewriting outdated applications from scratch usually means a brand-new schema that can look unrecognisable next to the old one. Transferring the existing dataset into your new system is a challenge that requires rigorous planning, development, and testing.