Invoice Template for Kotlin Android Developers
Android development in Kotlin has a fragmentation problem that directly affects billing — testing across device sizes, OS versions, and manufacturers takes real time that clients don't budget for. My biggest invoicing challenge is scoping device testing, which often uncovers bugs that require additional development time. The second challenge is billing for Play Store policy compliance work, which is invisible to clients but increasingly required.
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What to include on your invoice
Kotlin developers bill across UI, architecture, and deployment phases. Jetpack Compose Screen Development covers building native Android screens using Compose's declarative approach, including Material Design 3 theming and navigation with the Navigation Compose library. ViewModel and Repository Architecture refers to implementing the MVVM pattern with ViewModel, StateFlow, and a clean repository layer connecting to local and remote data sources. Room Database Integration covers designing Room entities, DAOs, and a database class with proper migration strategies for local data persistence. Retrofit API Integration refers to building type-safe API calls with Retrofit and Kotlin Coroutines, including error handling and response mapping with sealed classes. Google Play Store Submission covers signing the release APK/AAB, completing the Play Console data safety form, managing policy compliance, and submitting for review.
How to price your work
Kotlin developers price comparably to Swift developers for equivalent feature complexity. Hourly rates: $70–$170/hr. MVP apps: $6,000–$15,000. Complex apps with background services, Bluetooth, or camera integrations: $15,000–$40,000. Play Store submission as a standalone service: $400–$1,200. Device QA testing across 5+ devices is often quoted as a separate fixed-fee line item. Monthly maintenance for OS and SDK updates: $500–$1,500/month.
Getting paid faster
Kotlin clients building consumer apps often have aggressive launch timelines tied to marketing campaigns. Tie your milestone invoices to testable app builds — an APK shared via Firebase App Distribution, not just 'code pushed to GitHub.' When clients can open and use the app on their own phone, payment approval is nearly instant. Tangible, usable deliverables close invoices faster than abstract technical milestones.
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