Paper valet tickets fail in predictable ways. Stubs get lost, runners can't tell which request came first, and managers have no live view of the cars on site.

At Divtechnosoft, a custom software engineering agency that builds web apps, mobile apps and SaaS products for startups and scale-ups, we replaced that paper system for Summon, a digital valet platform. It now runs at 450+ locations, including hotels, restaurants, malls, hospitals, stadiums and large events, on infrastructure that costs under $40/month. The full project is covered in our digital valet management platform case study.

Here's how we approached it, and what other teams can take from it.

Three apps, one codebase

A valet product is really three surfaces:

Guest experience: guests get an SMS with a digital ticket link.…