Confluent also provide commercial support for it and employ Magnus who developed it. I've been working closely with librdkafka for a few months now and find it

Confluent also provide commercial support for it and employ Magnus who developed it. I've been working closely with librdkafka for a few months now and find it fast and reliable. Many companies rely on it in production. In addition to the Confluent clients, Blizzard has also developed a client that wraps librdkafka for nodejs (which they use in production). Disclaimer: I work at Confluent.