Add poolish, water, yeast, flour, salt, and malt powder to a stand mixer with a bread hook and mix on low for 3 minutes. Once the dough is combined, increase speed to high (speed 4 on my kitchenaid) and mix for another 6 minutes.
Transfer to a bowl, cover, and ferment at room temperature for 30 minutes. Perform a strength building fold. Cover, rest for 30 minutes. Do another strength building fold. Cover, rest for a final 60 minutes.
Transfer dough to a floured surface & divide into 4 equal pieces (about 230g each). Preshape each piece as shown @11:15. Cover with a towel & rest for 15 minutes.
Shape as shown @7:05 (process is the same as "better" baguette shaping).
Proof in a floured couche, cover, & proof shaped loaves for 45-60 minutes. Score with a bread lame and bake in a preheated, semolina dusted challenger bread pan. Bake 465F/240C covered for 12 mins. Remove lid & bake for 12-15 more mins until crusty & golden brown.