What end to end actually means here
Schema design through to the deployed interface, including the parts that usually fall between contracts: authentication, roles and permissions, file handling, background jobs, transactional email, and the admin screens your own team will live in every day.
Built to be handed over
Conventional structure, tests around the parts that carry money or data, and no clever abstraction that only makes sense to the person who wrote it. The measure of the work is whether your next developer can be productive in it without calling me.
Typical shapes
An MVP that has to survive real usage rather than only a demo. A replacement for a spreadsheet that outgrew itself years ago. A rebuild of a product whose original agency is gone. All three start the same way, with a paid week spent understanding what actually exists.