The French deep-tech, academic, and industrial, QUEST-IS 2025, the 1st International Quantum Engineering conference and exhibition, will gather many companies working in the quantum ecosystem from various countries. It thus gives ways to technical matters such as quantum computing and algorithms, quantum sensors, quantum communications, crypto, and the internet; including enabling technologies and, obviously, quantum engineering targeting applications for citizens. This multidisciplinary event brings together attendees from diverse backgrounds to discuss the technical challenges of applied quantum technologies and explore business opportunities.