from typing import List


def sum_neg(numbers: List) -> List:
    """Return a list of: Count of Positive and Sum of Negative numbers."""
    if numbers:
        # Solve the positive count using list() and filter() builtins.
        positive_count = len(list(filter(lambda x: x >= 0, numbers)))
        # Solve the negative sum using list comprehension.
        negative_sum = sum([num for num in numbers if num < 0])
        return [positive_count, negative_sum]

    return []