Yes! You have an amazing opportunity to contribute to a healthy culture of quality from the beginning of the company’s history! Rally your coworkers around the idea that everybody is working toward quality. Ask questions that bring people into the discussion and let them know you care about their definition of quality. Get yourself invited to the earliest meetings possible, preferably when the team is deciding what they want to make, and haven’t even started designing it yet. You can ask questions like: “What is the most important thing this feature is supposed to accomplish?” “What is it not supposed to do?” “Who will be using this feature? Is anyone not supposed to have access to this feature?”
As you get answers to those kinds of questions at the beginning of the process, keep them handy so you can return to them later. Remember that the answers will probably change over the course of the project to a certain extent. As the work progresses, you will be able to add another question to each of the ones above: “How will we verify this behavior?” This will help your team think about testability. Ask this question as early as possible, and as often as you need the answer, remembering that the answer may change and that others may not have thought about it yet.