employees = [
    {
        "first_name": "Bob", 
        "last_name": "Doe",
        "email": "bdoe@email.com",
        "address": {
            "city": "New York",
            "street": "1st Street",
            "house_number": 1
        }
    },
    {
        "first_name": "Mark", 
        "last_name": "Markson",
        "email": "mmarkson@email.com",
        "address": {
            "city": "San Diego",
            "street": "2nd Street",
            "house_number": 2
        }
    }
]

# Flatten the records first
employees_flat = [flatten_dict(emp) for emp in employees]
pd.DataFrame(employees_flat)