Petr Kozlov
Senior Android Developer @C24 Bank GmbH
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WORK HISTORY
Senior Android Developer @C24 Bank GmbH
Mainz, DE
Key achievements:• Led cross-team collaboration to seamlessly migrate the account switching service from a third-party SDK to an in-house solution, eliminating external costs and reducing support queries by 89%• Enabled 100% adoption of an in-house SDK for the account switching service by new users through an architecture supporting multiple SDKs, using feature toggles to manage a controlled migration with no feature downtime• Designed a token-based authentication system in the external account switching service, eliminating repeated WebView logins and enabling direct access to the feature within the app. This improvement raised successful account transfer completion rates from 57% to 86%.• Improved code maintainability and reduced sign-up flow bugs by 82% by refactoring a complex god-object ViewModel into five single-responsibility ViewModels, implementing proper state handling and distinct navigation graphs.• Reduced estimation meeting time from 1–1.5 hours to 20 minutes and eliminated redundant meeting cycles by introducing a developer analysis session, enabling developers to resolve technical constraints and clarify feature requirements in advance.• Reduced unexpected mid-sprint tickets by 78% and increased sprint success rate by 25% by establishing cross-team technical discovery planning sessions to align on complex topics early, ensuring well-defined acceptance criteria and clearer technical understanding.• Enabled full adoption of the user profile picture feature in a single sprint across 30 app modules and 6 teams by designing a clean, multi-layered architecture and developing a reusable Jetpack Compose component.• Optimized profile picture loading, reduced API calls, and enabled smooth scrolling through hundreds of items by implementing a secure, efficient image caching system using a dedicated Coil instance with authentication enforcement and a custom OkHttp interceptor.Tech stack: Kotlin, Jetpack Compose, Coroutines, Flow, MVVM, Koin, Retrofit
EDUCATION
Saint Petersburg State Electrotechnical University "LETI"
Master's degree
Saint Petersburg State Electrotechnical University "LETI"
Bachelor's degree
ABOUT PETR KOZLOV
I’m a Senior Android Developer with 8+ years of experience building apps that solve real…
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