Blanchon Hardwood Oil issues

My builders have done our wood floors and we went to visit the house today. There are major streaks - some sections look darker, some lighter and you can see where they seems to end with a brush. Is there anything we can do? (Pics below)

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Hi Im sorry to say but it will need sanding of and redone again properly

Pigmented Hard Waxoils (irrespective of manufacturer) need to be buffed or clothed off by hand to even out the pigment. The roller overlap in your photo shows that this hasn't been done.

The floor's tone though does look quite dark, so I'm wondering if your builders have used a stain first? If a water based (as opposed to a self-fixing or spirit based) stain was used and they haven't applied the Hard Waxoil over the top, it may be possible to even it out. Any more info on what exactly has been used?