Phoenix Systems is the developer of the Phoenix-RTOS operating system, designed for the dynamically growing Internet of Things market. Phoenix-RTOS is based on the microkernel architecture and is widely deployed in the Smart Grid devices (smart energy meters, data concentrators) as well as smart gas meters with a very low power consumption. It can scale from a compact version with native API occupying just tens of kilobytes to fully-fledged UN*X-like operating system with rich application interface. Due to its real time capabilities and extremely efficient architecture, Phoenix-RTOS is the perfect platform for IoT applications. Phoenix-RTOS is already ported to various architectures (IA-32, ARMv7, ARM, RISCV). Phoenix Systems is well known not only in Poland but also globally in Europe and Asia due to its highly innovative profile. Since 2018 Phoenix-RTOS is open source available on the GitHub on the BSD license that allows developers to modify the code becoming a part of the growing community built around Phoenix-RTOS.