Founder of Stencil here, I'll be around to answer questions.
This project started after I started playing with RC plane and was looking for ways to overlay telemetry data on my video. I realized that there's actually a similar use case but for images instead and pivoted to this idea.
Took around 7 months to build while working full-time. My expectation was around 3 months but as any software project, deadline is just a suggestion. Having a toddler in a pandemic does not help expedite the process :D
Overall I had really fun building this.
For those curious, this is the stack.
Backend - Elixir with LiveView
Frontend - Rescript with RescriptReact
Deployment - Kubernetes deployed to managed DO kubernetes cluster