Recurrence pattern: every year in April.

International Systems Engineer Day is celebrated on November 28th to honor the contributions of systems engineers, who play a crucial role in ensuring the functionality of various technologies, from smartphones to spacecraft. Founded by Nicholas Fourie and his colleagues in 2012, the day recognizes the efforts of these professionals who work behind the scenes to enhance efficiency and comfort in daily life. Observances may include personal self-care for systems engineers, social gatherings with colleagues, or expressions of appreciation from friends and family, such as taking them out for dinner or providing treats at work. The day serves as a reminder to acknowledge the importance of systems engineers in making the world a better place.