still not clear what programmatic advertising is

the practical difference from normal google ads: you often don't know which sites actually showed your ad unless you go and look. pull the placement report after the first week, you'll want to exclude some of them.

It just means buying ad space through an automated auction rather than talking to each website. You set who you want and what you'll pay, software places the ads across thousands of sites in the time the page loads. At your scale it's almost certainly not where the money should go - b2b with a narrow audience does better on search and on the platforms where you can target by job title, because the buying pool is the point and yours is small.