Zahumensky intended the Joker as a clean-sheet attempt to rethink how ultralight trikes are designed, including styling and pilot seating. The resulting aircraft was designed to comply with the Fédération Aéronautique Internationale microlight category, including the category's maximum gross weight of 4500NaN0. The aircraft has a maximum gross weight of 4500NaN0. It features a strut-braced hang glider-style high-wing with electric trim, weight-shift controls, a two-seats-in-tandem open cockpit with a non-structural fibreglass cockpit fairing, tricycle landing gear with wheel pants and a single engine in pusher configuration.
The aircraft is made from bolted-together aluminum tubing, with its double surface wing covered in Dacron sailcloth. The Bautek Pico S "topless" wing has a span of 12.21NaN1, is supported by struts and uses an "A" frame weight-shift control bar. The powerplant is a four-cylinder, air and liquid-cooled, four-stroke, dual-ignition 800NaN0 Rotax 912S engine or a twin cylinder, air-cooled, two-stroke, dual-ignition 550NaN0 Hirth 2703 engine.
The aircraft has an empty weight of 2190NaN0 and a gross weight of 4500NaN0, giving a useful load of 2310NaN0. With full fuel of the payload is 1950NaN0.
A number of different strut-braced wings can be fitted to the basic carriage, including the Bautek Pico S and the Aeros Profi TL.