Senior Software Engineer Android

About the Company

Stone is a technology and financial services company focused on the customer. We are the largest independent payment methods company in Brazil, aiming to transform the payment industry and serve Brazilian entrepreneurs.

Responsibilities

• Design, develop, and maintain the base (SDKs, APPs, and libraries) used by all applications running on our Android POS devices
• Contribute to the definition and evolution of platform architecture, ensuring scalability, security, and high performance
• Identify and implement improvements in CI/CD processes, automated testing, and platform monitoring
• Serve as a technical reference, mentoring and supporting developers from different teams
• Ensure code excellence and standardization through code reviews and best practices (SOLID, Clean Architecture)

Requirements

• Minimum 6 years of experience in native Android development using Kotlin or Java
• Proven experience in developing and maintaining complex SDKs, libraries, or platform modules
• Deep knowledge of software architectures (MVVM, MVI, Clean Architecture) and design principles (SOLID)
• Familiarity with dependency management (Gradle) and project modularization
• Experience with Android background services (WorkManager, ForegroundService, BroadcastReceiver, etc.)
• Experience with version control (Git) and CI/CD processes
• Practical knowledge of unit and integration testing
• Experience with KMP
• Knowledge of connectivity and network protocols or libraries like OkHttpClient, UrlConnection, or Ktor

Preferred Qualifications

• Previous experience in developing solutions for payment terminals (POS) or embedded systems
• Knowledge of AI and Prompt Engineering (LLMs)
• Experience with observability and analytics tools (Grafana, GCP, Looker Studio)
• Knowledge of security and cryptography applied to Android environments
• Familiarity with Android Open Source Project (AOSP) or firmware customization
• Experience with Coroutines, Flows, and Jetpack Compose