I've had some dealings with them (almost became a customer but the project went away), they're smart cookies and their DB is a nice alternative to Neo4j (seems a bit faster, a bit, C++ rather than Java, implements most of the Cypher query language).
off topic, but Dominik, the founder of Memgraph here. If we didn't connect yet, I'd love to learn how was your experience using Memgraph if you're up for sharing some feedback? DM me on any of the social sites or our community Discord if you've joined :)