# Delivered full Progressive Web App support — installable and offline‑capable — with Workbox runtime caching via next‑pwa. 2025 **Situation.** A lot of NextMariner's users are at sea. Seafarers and field staff, on phones, frequently offline or hanging off a bad connection — not people sitting at a desk on reliable office wifi. Building as if everyone had a fast, constant network would have quietly excluded a big part of the actual audience. **Task.** The app had to be installable like a native one, and still usable when the network drops out. **Action.** It's delivered as a full Progressive Web App. It installs to the home screen with proper icons across the various sizes, a splash screen and theme colours, so it looks and launches like an app rather than a bookmark. The service worker is set up through the next‑pwa plugin, and Workbox runtime caching uses CacheFirst for the things that don't change per request — fonts, images, audio, video, CDN assets — alongside sensible HTTP cache‑control headers. Because service workers only really behave over HTTPS, HTTPS‑based testing validated the offline and install behaviour on real devices instead of hoping it worked. **Result.** Users can install the app and keep using it offline, and repeat loads come back fast from cache instead of over the wire. The platform behaves like a native app on the hardware its users actually carry, which for this audience isn't a nice‑to‑have — it's the difference between the app being usable at sea and not. --- - Role: Full Stack Engineer - Categories: [Frontend Engineering](https://software.engineer.company/categories/frontend/), [Full‑Stack Development](https://software.engineer.company/categories/full-stack/), [Web Development](https://software.engineer.company/categories/web-development/), [Reliability & Backups](https://software.engineer.company/categories/reliability/), [Performance Tuning](https://software.engineer.company/categories/performance/) - Services: [Frontend Development](https://software.engineer.company/services/frontend-development/), [Website Development & CMS](https://software.engineer.company/services/web-development/)