AGSTU Sierra™ is a hardware-implemented real-time kernel and RTOS accelerator for FPGA-based embedded systems. It delivers deterministic ultra-low latency performance, fast interrupt handling, and hardware-based task scheduling with minimal software overhead. Sierra can operate as either a stand-alone real-time kernel or an accelerator for traditional RTOS solutions. The solution is delivered as a portable FPGA IP core with lightweight C API, integrated logging, and a regression test framework for efficient HW/SW validation and system integration.