If anybody ever needed an answer to the question "will my startup/product be useful for the world?", take a look at this example/product.

This product doesn't seem like a startup-driven idea, but it addresses a serious pain-point for people (more specifically: developers) looking for (remote) jobs in a way that is required to find the right job:

> Using filters to narrow down to a subset of companies to apply to

Great job on this product, it is a great alternative to having to wait 30 days for each "Who is Hiring" without a guarantee that many remote companies who are hiring will post on that HN thread.