Hey, we are also trying to solve the resume, since 2015 - so I'll give some advice after scaling our resume software.
As far as scaling - I wrote an article on how we got our first 50k users here - https://www.linkedin.com/pulse/0-50000-users-candid-look-cre...
Keep in mind:
• Success will come from your ability to execute on technology, design, branding, and finding a way to scale (SEO).
• Don't be discouraged by negative feedback if you believe in your idea.
• Build something that people care about - people will care about your mission or approach if the experience of using your product is memoriable.
• There's a lot of competition - So don't be discouraged by our progress