Andrey Artemov contributed to SAP/SapMachine and JetBrainsRuntime by enhancing runtime performance, reliability, and mathematical capabilities. He improved Java Flight Recorder’s threading and locking by replacing SpinlockHelper with SpinCriticalSection and optimizing spin-wait logic, which increased profiling efficiency and concurrency safety. In SAP/SapMachine, he addressed cross-platform error handling by ensuring errno propagation in os:: APIs and resolved ObjectMonitor liveness issues under thread suspension, strengthening multithreaded stability. For JetBrainsRuntime, he ported the asinh function from fdlibm to Java’s Math and StrictMath, expanding numeric support. His work demonstrated depth in C++, Java, concurrent programming, and system-level problem solving.