Ask HN: Is There “Dev-Feedback as a Service”?

I'm the founder of a startup that is building cool things™ with web technologies. The dev team, including myself, is quite junior and we don't have the budget to hire a senior developer full time, yet. It would be great to get feedback on crucial design decisions and code quality from someone more experienced than I am (most senior person, but also responsible for most business tasks), even if it were only a couple of hours per week or 1-2 days per month. I went to freelancer market places (e.g. upwork), but this kind of job requires a lot of interaction with the client – in the end, it's almost teaching – and that doesn't seem to be in high demand. Are there people specialized not only in providing feedback and training to teams of junior devs, but also providing that as a service?

For what it's worth: mostly Vue, Node, Python, AWS, Docker, Postgres, Mongo (esp. migration to Postgres :D)