Thanks so much for the feedback! It's really funny because my partner and I jumped between 'effective' and 'impactful' for the main copy a couple of times! I'm curious to know what others on HN think? I'll make a round of changes this weekend and will update the headline.
It's a matter of audience. "Impactful" is a corporate buzzword neologism, so it turns some people off. But it will definitely attract the kind of people who leverage synergies to align their processes for the win-win-win. Who do you want using your site?
Agree that impactful jumped out as clunky (and I say this a corporate consultant). Also agree that effective is better, but still too non-specific. Maybe: "Write resumes that get interviews." Interviews are specific positive outcome directly tied to resume quality.
You're welcome! Didn't mean to sound like a jerk, but I run a service that helps copywriters and content-writers write better, so this kind of thing tends to jumps out at me.