Yuni served as Head of the-stable-of-Seti-I, Charioteer of His Majesty, and Chief of the Medjay before becoming Viceroy during the reign of Seti I.^[1] He would use some of these titles simultaneously. On a stela from Abydos – now in the Cairo Museum (Jd'E 34620) – the inscription reads:

Made by the Superintendent of Deserts in the Southern Foreign country, Viceroy in Nubia (Ta-Sety), Chief of Works in the Estate of Amun, Chief of the Madjayu-militia, Iuny. (Kitchen)^[2]

Yuni started the Egyptian building projects at Amara West and Aksha.^[3] It was "on his orders that the first blocks of the Abu Simbel temples were cut.^[3] Yuny commemorated his work with a rock-cut scene showing himself standing before Ramesses II on the Abu Simbel cliff.^[3] After ten years under Ramesses II, Yuny retired from his post in Nubia.^[3] He was succeeded by Heqanakht.

• Abydos stela (Cairo JdE 34620) Yuny is shown adoring the Abydos Triad consisting of Osiris, Isis and Horus.^[2]
• Abu Simbel Rock Stela No.10 The Viceroy Yuny appears before Pharaoh Ramesses II, who is seated on a throne.^[2]
• Rock stela at al-Kanāʾis (el-Kanaïs) The Viceroy Yuny is kneeling before Pharaoh Seti I, who is seating on a throne.^[4]