Dumbbell home fat-loss circuit

Build me a 30-minute full-body dumbbell circuit I can do at home with one pair of adjustable or medium dumbbells. I'm a beginner woman in my 30s; my goal is fat loss and energy, and I want to keep my muscle while I'm in a calorie deficit. Start with a 4-minute warm-up: 1 minute marching in place, then bodyweight squats, arm circles, and hip hinges for 30 seconds each, twice through. Then give me a circuit of 6 exercises: goblet squat, dumbbell Romanian deadlift, dumbbell floor press, bent-over dumbbell row, dumbbell reverse lunge, and a standing dumbbell shoulder press. Prescribe 3 rounds of the circuit, 10-12 reps per exercise, choosing a dumbbell weight that leaves me about 2-3 reps in reserve (RPE 7-8, hard but not to failure). Rest about 30 seconds between exercises and 90 seconds between rounds. Tell me how to judge if the weight is right and how to swap a move if my shoulder or knees complain. Finish with a 2-3 minute cool-down walk-in-place and gentle stretches. Tell me the total reps per move so I can log it.