Vertical takeoff and landing (VTOL) vehicles are among the most versatile UAVs, appropriate for various missions. Given that there are still open challenges regarding the VTOL design, this paper presents the full development and test cycle of a tail-sitter. IMAV 2022 competition rules are used to define the mission objective and constraints. A multidisciplinary design and optimization strategy is defined with the goal of maximizing competition score considering design, manufacturing, and competition constraints. While still being a work in progress, the resulting vehicle is designed to fly at 18 m/s, for around 14 minutes while carrying 200g of payload and weighting approximately 750g.