U

Ualá

Fintech with free prepaid Mastercard payments

Android Technical Lead - Cripto

Mobile EngineeringConfirmed live in the last 24 hours
Full-timeArgentinaNo salary listed

About the Job

Requirements

  • More than 5 years of experience in native Android mobile development.
  • At least 1 or 2 years of experience in technical leadership roles or as a mobile team technical reference.
  • Experience with fintech, crypto, or Web3 products, including transactional apps, digital wallets, or crypto assets.
  • Advanced proficiency in Kotlin, Android Jetpack (Compose, Coroutines, Flow), and modern architecture patterns.
  • Proficiency in React Native, JavaScript or TypeScript, Redux or Context API, bridges, and Native Modules communication.
  • Android security knowledge, including Android Keystore, data encryption, certificate pinning, and prevention of OWASP Mobile vulnerabilities.
  • Experience integrating RESTful APIs, WebSockets, or gRPC, with efficient state and network failure handling.
  • Experience with testing tools including JUnit, MockK, and Espresso, and mobile CI/CD pipelines including Fastlane, GitHub Actions, and Bitrise.
  • Knowledge of UX/UI for financial or crypto operations.

Responsibilities

  • Guide Android developers in day-to-day feature implementation, conduct code reviews, and ensure architectural consistency of the app.
  • Design and build mobile modules in Kotlin using modern architectures such as MVVM/MVI and Clean Architecture, ensuring performance and stability.
  • Implement and oversee strict mobile security practices, including Keystore, local data encryption, biometric authentication, and protection of crypto credentials.
  • Monitor app metrics such as response times, crash rate, and memory usage, and ensure automated test coverage.
  • Collaborate with UX/UI designers and backend leads to translate complex crypto user flows into simple, intuitive screens and interactions.
  • Participate in effort estimation, task breakdown, and continuous integration and delivery for regular production releases.

About the Company

Ualá

Fintech with free prepaid Mastercard payments

Ualá provides a free prepaid Mastercard and a mobile app in Argentina to help people manage their money. The app lets users spend anywhere Mastercard is accepted, send and receive money instantly at no cost, pay bills, recharge prepaid services, and load their SUBE card. It uses a freemium model with no fees to open, maintain, or close an account, and it earns mainly from Mastercard interchange fees and potential partnerships; all services run in-app with online support. The goal is to simplify everyday money tasks for Argentinians by offering a digital platform that combines payments, transfers, bill payments, and card access in one mobile app.

Company size
1,001-5,000
Company stage
Late Stage VC
Total funding
$1.2B
Headquarters
Buenos Aires, Argentina
Founded
2017

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