Here are a few things that I can offer you:
The complete Rails guide to developing a security strategy for busy lead architects.
Rails security since 2007. All in one place: Updated guides about a growing number of Ruby on Rails security topics and all your questions answered.
A monthly service that adapts your Rails application security to the future by focusing on the long-term success of the app and your dev team.
The little sister of Trackman Up. This is a step-by-step strategy guide to level up all facets of security yourself. It includes a short audit of your application to find quick wins.
In my Rails security audits, I read your entire codebase and propose changes that you can potentially make. The outcome is a color-coded report for the management and a detailed technical report. Because I've audited numerous Rails applications in the last 10 years, this will uncover Rails-specific problems and be significantly quicker at this depth. This is best suited for when you’re unsure about the current security or you’re looking for a second opinion.