  Low-code application development as proposed by the OutSystems Platform
enables fast mobile and desktop application development and deployment. It
hinges on visual development of the interface and business logic but also on
easy integration with data stores and services while delivering robust
applications that scale. Data integration increasingly means accessing a
variety of NoSQL stores. Unfortunately, the diversity of data and processing
models, that make them useful in the first place, is difficult to reconcile
with the simplification of abstractions exposed to developers in a low-code
platform. Moreover, NoSQL data stores also rely on a variety of general purpose
and custom scripting languages as their main interfaces. In this paper we
propose a polyglot data access layer for the OutSystems Platform that uses SQL
with optional embedded script snippets to bridge the gap between low-code and
full access to NoSQL stores. In detail, we characterize the challenges for
integrating a variety of NoSQL data stores; we describe the architecture and
proof-of-concept implementation; and evaluate it with a sample application.
