When I started building SkyCast Pro, the idea was simple: a weather app that felt fast, looked clean, and didn't bury useful information behind five taps. What I didn't expect was how much of the real work would happen after the app "worked" on my own phone.
Picking the Weather Data Source
The first real decision was which weather API to use. A lot of weather apps lean on paid services with strict rate limits, which makes sense for huge platforms but is painful for an indie project. I ended up building SkyCast Pro around Open-Meteo, a free, high-resolution weather API that doesn't require a key for basic use. It gave me hourly forecasts, 16-day outlooks, UV index, and air quality data without a billing dashboard hanging over the project.
The trade-off is that free APIs can be slower or less consistent than premium ones, so a huge part of the engineering work went into handling failure gracefully — caching the last successful forecast locally, falling back to it when the network is slow, and making sure the app never just shows a blank screen. A weather app that fails silently is worse than useless; it's actively misleading.
Getting Location Right Is Harder Than It Sounds
GPS sounds simple until you build for it. Indoors, GPS can take ten or more seconds to get a lock, especially on older Android phones. If you time out too aggressively, you either show nothing or show a stale location. I ended up combining getLastKnownPosition() (to show something instantly) with a longer-running fresh GPS request running in the background, so the screen never feels frozen.
Reverse geocoding — turning raw coordinates into a readable city name — had its own surprise: in some regions, the usual on-device geocoder is unreliable or blocked outright. I had to add a secondary HTTP-based geocoding fallback so users in those regions still see "Moscow" instead of a pair of coordinates.
Shipping Is a Different Skill Than Building
The part nobody warns you about is the Google Play review process itself. My first closed-testing submission was rejected — not because of a bug, but because my testers had installed the app and never actually opened it again. Google checks for genuine engagement during closed testing, not just an opt-in headcount. The fix wasn't technical; it was making sure real people were actually using the test build daily for the full 14-day window.
Even after reaching production, the lessons didn't stop. A single aggressive network timeout setting caused the app to show an incorrect "offline" banner on slower connections, even when the user had a perfectly working internet connection. It's a good reminder that "it works on my WiFi" is not the same as "it works."
What's Next
SkyCast Pro is still actively maintained — every update is a chance to fix something a real user reported, not just something I guessed might be a problem. If you're building your own Flutter app, my honest advice is: budget as much time for the boring parts (error states, slow networks, Play Store policy) as you do for the feature you're excited about. That's where most of the real engineering lives.