Senior Mobile Engineer – React Native, Expo, TypeScript

easybill GmbH

. Further develop easybill mobile using React Native, Expo, and TypeScript for iOS and Android .

Posted 9/18/2026contractRemote • GermanySeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in developing mobile applications using React Native, TypeScript, and Expo, with a strong focus on performance, accessibility, and secure data management. Proficient in integrating REST APIs and ensuring high-quality native interfaces for both iOS and Android platforms.

Highest-signal resume keywords

React Native DevelopmentTypeScript ProficiencyREST API IntegrationAutomated TestingFluent German

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

TypeScriptReact NativeExpoREST APIPHPSymfonyAutomated TestingMobile Application DevelopmentPerformance OptimizationComponent Architecture

Soft Skills

Clear CommunicationIndependent WorkPragmatic Approach

Tools & Technologies

Claude CodeEASSimulatorsApp Store

Industry Keywords

Mobile WorkflowsData ManagementAccessibilityMultilingual SupportApp Release Processes

Tech Stack

Tools & technologies

AndroidiOSKotlinPHPReactReact NativeSwiftSymfonyTypeScript

About the role

Key responsibilities & impact

Further develop easybill mobile using React Native, Expo, and TypeScript for iOS and Android
Translate requirements related to invoices and documents into intuitive mobile workflows and high-quality native interfaces
Evolve the app architecture and create maintainable structures for navigation, reusable components, forms, and data access
Integrate REST APIs and ensure reliable data management, including typed interfaces, validation, caching, loading states, and error handling
Extend the REST API based on PHP and Symfony when needed
Develop secure authentication and session management, while handling sensitive customer and business data with care
Account for performance and platform-specific considerations across changing network conditions, app switching, and different devices
Ensure accessibility and multilingual support
Safeguard changes through automated tests and validation on simulators and real devices
Help shape build, release, and monitoring processes through to publication in the app stores
Challenge requirements, contribute your own solution proposals, and support features from ideation through release and continuous improvement
Make intensive use of AI tools such as Claude Code, while taking responsibility for the quality, clarity, and correctness of the results

Requirements

What you’ll need

Freelancer status
Extensive senior-level experience with TypeScript, React Native, and Expo
Experience taking mobile applications beyond implementation through to release
Understanding of React, component architecture, state management, and asynchronous data flows
Knowledge of iOS and Android platform specifics
Systematic approach to performance issues, platform-related bugs, and debugging
Strong experience integrating REST APIs, with an understanding of API contracts, authentication, validation, and error handling
Automated testing, well-reasoned technical decisions, and maintainable code
Independent, pragmatic approach to work and clear communication
Fluent German and good English skills
PHP and Symfony knowledge is a plus
Additional advantages: experience with EAS, native modules in Swift or Kotlin, app store publishing, and mobile release processes
Published apps, open-source contributions, or public experiments on GitHub are welcome

Benefits

Comp & perks

Remote-first team – no location requirement
An inspiring and flexible work environment based on trust and personal responsibility
The opportunity to help shape the company’s strategy and culture
A committed team and the opportunity to work together on innovative solutions
Regular team events