I really like the posts going to brackets on the slab. I do wonder why this technique would be used instead of stick framing though. Seams like it's the same work, but much harder to finish the interior if that's the intent. Is there an advantage to a pole structure on an engineered slab over stick framing?
Mostly ease of construction on the pole building - which saves labor costs and gets you under roof a lot faster over a framing crew coming out and assembling it all on site. As you can see from jomelo's photos, the sections go up pretty quickly. More is being done with prefab wall panels - framing everything out on an assembly line and then taking the sections out to site for assembly (photos from the internet).
There is less of a savings with a pole building if you finish the building out traditionally as you end up having to stick frame between the "poles" for things like batt insulation, drywall, and trim. The typical finish is to do wide batts and then metal panels similar to the exterior. Again, that speeds up construction over typical stick construction finishes.