As a full-stack web or mobile engineer, you must have strong experience in the technologies you claim to know. You most likely have experience working at an early stage startup and are confident you can have an impact almost immediately in a team.
Many startups need interim engineering leaders who will help them bring a product to market or help lead a team for a period of time. You have proven experience leading an engineering team (or teams) at a startup of some note. If needed, you can (and will be called upon to) be hands on.
Often, early stage startups don't have a full-time devops engineer on staff but need help setting up and managing their infrastructure. This is where you come in. You must have solid experience with this.
A platform that is familiar with and aligned to your needs.