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Freelancer Senior Mobile Engineer React

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Freelancer Senior Mobile Engineer React in Others new

  • easybill GmbH
  • Full time
  • Email
  • Berlin, Germany

Responsibilities

  • Develop and evolve the easybill-mobile application for iOS and Android with React Native, Expo, and TypeScript.
  • Translate invoicing and document requirements into clear mobile workflows and high-quality native interfaces.
  • Develop the app architecture, navigation, reusable components, forms, and data-access structures.
  • Integrate and extend API functionality, including typed interfaces, validation, caching, loading states, and error handling.
  • Implement secure authentication, session management, and careful handling of sensitive customer and business data.
  • Address mobile performance, platform-specific behavior, connectivity changes, accessibility, and multilingual support.
  • Create automated tests and verify behavior on simulators and physical devices.
  • Help shape build, release, monitoring, and app-store publication processes.
  • Contribute to features from ideation through release and subsequent improvement, using AI tools such as Claude Code while maintaining output quality and correctness.

Requirements

  • Freelance status and senior-level experience with TypeScript, React Native, and Expo.
  • Experience taking mobile applications beyond implementation through release.
  • Strong understanding of React, component architecture, state management, and asynchronous data flows.
  • Knowledge of iOS and Android platform differences, performance troubleshooting, platform issues, and debugging.
  • Experience integrating APIs and understanding API contracts, authentication, validation, and error handling.
  • Ability to understand existing API endpoints, diagnose app-backend issues, and independently extend interfaces.
  • Experience with automated testing, maintainable code, and clearly documented technical decisions.
  • Independent, pragmatic working style with clear communication and customer-focused judgment.
  • Fluent German and good English skills.
  • PHP and Symfony knowledge is preferred; EAS, Swift or Kotlin native modules, app-store publication, mobile release processes, published apps, open-source contributions, and GitHub experiments are additional advantages.

Benefits

  • Remote-first work with no location requirement.
  • Flexible, trust-based working environment with substantial autonomy.
  • Opportunity to contribute to company strategy and culture.
  • Engaged team working on innovative solutions.
  • Regular team events.

easybill GmbH

easybill GmbH builds SaaS invoicing and finance-automation software for freelancers, SMBs, and e-commerce merchants, including e-invoices compliant with GoBD and over 60 marketplace and shop integrations. Its products include easybill for billing and easybill Connect for syncing orders, shipping,...

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