Quality Open Software (QOS. CH Sarl) is a leading software design and development company based in Vouvry, Switzerland. With a strong focus on mission-critical enterprise software, we specialize in using the Java language to deliver high-quality solutions.

As the founding contributors of esteemed open-source projects like log4j 1. x, reload4j, slf4j, and logback, we have a deep understanding of these frameworks. Apart from our expertise in open-source projects, we offer professional support for the aforementioned projects.

Unlike most open-source endeavors operating on a best-effort basis, our support services provide authoritative responses and guaranteed response times. In addition to this, we conduct thorough reviews of your logging practices, resulting in significant savings in infrastructure costs. Furthermore, we provide custom development services tailored to your specific requirements.

For more information on our support package or to discuss your needs, please reach out to us. We also give you the opportunity to support SLF4J/logback projects through donations and sponsorships. We sincerely thank our current supporters and sponsors for their valuable contributions.

Contact us via email at sales(at)qos. ch or send us a letter at our postal address: QOS. ch Sàrl rue Arthur Parchet 1 CH-1896 Vouvry (VS) Switzerland.

It's worth noting that although logback has a prevalence rate of 48% in the logging implementation category, no attacks have been reported against it to date