Hire PWA Developers for App-Like Web Experiences

How to vet a PWA developer

A PWA developer needs strong web fundamentals plus specific knowledge of service workers, caching strategies, IndexedDB, the web app manifest and web push. The hardest parts are caching and updates: serving stale prices, failing to show new releases or filling a device's storage are common mistakes. Ask candidates how they decided what to cache, how they handled service worker updates and how they tested offline behavior.

Platform differences matter too. Candidates should know what Safari on iPhone supports and what it does not, and how to design fallbacks. Experience with server rendering frameworks is valuable, because the best progressive web apps are fast, indexable websites first and installable apps second.

• Clear caching strategies per route and asset type.
• Handles service worker updates without trapping users on old versions.
• Knows iOS and Android PWA differences in practice.
• Builds offline queues with IndexedDB and background sync.
• Measures performance with Core Web Vitals and real-user data.
• Writes accessible, semantic HTML.

Interview questions we use for PWA developers

We ask about real offline and update scenarios, since that is where PWAs succeed or fail. Good candidates describe specific tools such as Workbox, explain trade-offs and know how to debug service workers in browser developer tools. Hands-on debugging experience shows quickly in the answers.

The best candidates also think about users who never install the app. They treat installation and push as enhancements, make sure the site works well in a normal browser tab and avoid aggressive install prompts, because most visitors decide whether to return based on speed and usefulness, not on an icon.

• Which caching strategy would you use for product prices, images and the app shell, and why?
• How do you roll out a new version when users already have an old service worker?
• How would you queue form submissions made offline and sync them later?
• What PWA features are missing or limited on iOS, and how would you work around them?
• How do you send web push notifications, and what is required on iPhone?
• How do you test offline behavior automatically?

Onboarding a PWA developer in the first two weeks

The first week focuses on understanding how the current site renders, which routes matter most offline and how deployments work. The developer audits the existing service worker or caching setup, if one exists, measures performance on real phones and documents risks such as stale data or unbounded caches. Small fixes during this week build familiarity with the codebase and release process. Findings are shared in a short written report.

In the second week, they implement a scoped improvement, such as offline support for one key flow or installability with a proper manifest and update prompt, and test it on Android and iOS. Our PWA vs native app comparison helps product owners set realistic expectations about what the PWA can do on each platform.