@Jennifer
Your role is engineering, your strongest evidence lies in your technical contribution, the work you personally did to build, improve, or launch the product. You can then use commercial results like user growth or adoption to validate the impact of your technical work.
The commercial contribution examples in the Tech Nation guidance mainly apply to business applicants like founders, CEOs, or marketing leads whose day‑to‑day work is tied to sales, revenue, or strategy. For engineers, assessors focus on technical artefacts, code, architecture diagrams, product documentation, or letters confirming your role in building the product. Just as they won’t assess CEOs, or marketing experts on code, architecture diagrams and those artefacts technical people own.
It’s normal that engineers don’t have access to financial or marketing data unless they’re in management. So, your founder can mention those commercial outcomes in their letters, for example, noting the metrics and mentioning that you were given access to share company metrics to support your application.
In short:
Focus on what you personally built or did technically.
Use commercial growth like user numbers or adoption only as supporting evidence to show the impact of your technical contribution.
Don’t worry if revenue is still small, from my experience with supporting successful applicants, Tech Nation first assess applicants in relative to their discipline or area of expertise, then other artefacts can validate.
Your contribution is first checked around technicality, then sales as supporting.
All the best.