Senior Android Engineer

Quick Facts

• Domain: FinTech Android development
• Tech: Kotlin, Jetpack Compose
• Focus: authentication/authorization and mobile security
• Work mode: fully remote
• Contract: B2B, 150 PLN/h + VAT

Description

Develop and enhance a FinTech Android application using Kotlin and Jetpack Compose. Implement authentication and authorization mechanisms (e.g., OAuth 2.0, OpenID Connect, biometrics, MFA) and ensure secure handling of app data and tokens. Contribute across the full app lifecycle—from concept and implementation through testing and publishing to Google Play.

Responsibilities

• Develop Android features and improve existing components
• Design and implement user authentication and authorization flows
• Ensure app security, including secure storage of data and tokens
• Write clean, testable, and well-documented code
• Work with development and product teams in an Agile/Scrum environment
• Deliver services fully remotely

Requirements

• Several years of commercial experience in Android app development
• Very good Kotlin knowledge, including Coroutines and Flow
• Practical experience implementing mobile authentication (OAuth 2.0, OpenID Connect, biometric login, MFA, token and session handling)
• Knowledge of mobile security topics (Android Keystore, data encryption, OWASP Mobile)
• Knowledge of Jetpack Compose and modern Android components
• Experience with architectural patterns such as MVVM and Clean Architecture
• Experience with unit tests and maintaining code quality
• API integration experience (GraphQL is a plus)
• Ability to analyze problems independently and propose solutions
• Very good English (minimum C1)

Benefits

• Fully remote work
• B2B rate: 150 PLN/h + VAT