Ask HN: How do you go about building low code visual tools in 2021?

Seeing a lot of low code platforms being built that have a baked in capability to define a workflow for data and use case automation. I am wondering how does one go about building such workflow based engines in 2021?<p>Interested in understanding how to design the backend? Amazon seems to have its own state [language] (https:&#x2F;&#x2F;docs.aws.amazon.com&#x2F;step-functions&#x2F;latest&#x2F;dg&#x2F;concepts-amazon-states-language.html)<p>Any frameworks from OSS world that are dominating this space? Or just a collection of internal tooling exposed via APIs.<p>Any reference open architectures out there for backend and UI? Any theoretical concepts I need to revisit to get better at thinking about this? Finite State Machines modelling seems to be an obvious choice.<p>Some links:<p>AWS Step Functions :https:&#x2F;&#x2F;aws.amazon.com&#x2F;blogs&#x2F;aws&#x2F;new-aws-step-functions-workflow-studio-a-low-code-visual-tool-for-building-state-machines&#x2F;<p>Shopify Flow: https:&#x2F;&#x2F;apps.shopify.com&#x2F;flow<p>Bubble: https:&#x2F;&#x2F;bubble.io&#x2F;