No. Turkiye did not design neither tanks nor jet aircraft on its own. Turkiye received technical support from Korean ROTEM regarding tanks. Turkiye also received technical support from the British company BAE Systems for jet fighter aircraft for air superiority.
The Altay-1 tank was to be built with the German MTU+Renk power pack, but Germany said "I'm not playing this game!" said, it was necessary to design and manufacture the power pack locally. If there is no earthquake in Istanbul, in 2025, the Altay-2 will be a 100% Turkish-made tank both in design and in terms of all critical components including the power pack.
On the subject of TFX jet aircraft, we learned a lesson from Altay-1. We started the engine development business early. Even if the joint development talks with British Rols-Royce company do not succeed, TFX will be in the skies in the 2030s with domestic engines installed.
Among these works, we are busy with unimportant(!) works such as developing all kinds of sensors, diesel and turbine engines, guided munitions and drones. For some reason, nobody helps them.