Senior Mobile Engineer

Qualysoft

. Design, develop, test, and maintain cross-platform mobile applications using React Native and Expo .

Posted 10/20/2026full-timeBucharest • RomaniaSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in designing and developing cross-platform mobile applications using React Native and Expo, with a strong focus on performance optimization, secure data handling, and integration with REST APIs. Proven ability to mentor developers and lead code reviews while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

React Native DevelopmentExpo EcosystemJavaScript and TypeScriptREST API IntegrationMobile Application Testing

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Applicant Tracking System Keywords

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Hard Skills

Cross-Platform Mobile Application DevelopmentMobile Application ArchitectureState ManagementAuthentication and AuthorizationPerformance OptimizationUnit and UI TestingDebuggingAsynchronous Data HandlingMobile NavigationSecure Data Storage

Soft Skills

CommunicationCollaborationMentoring

Tools & Technologies

GitHub CopilotJestReact Native Testing LibraryGit

Industry Keywords

Mobile Application LifecycleIOS and Android DifferencesCachingData SynchronizationCode Review Processes

Tech Stack

Tools & technologies

AndroidiOSJavaScriptJestReactReact NativeReduxTypeScript

About the role

Key responsibilities & impact

Design, develop, test, and maintain cross-platform mobile applications using React Native and Expo
Define and evolve mobile application architecture, including navigation, state management, and reusable components
Integrate mobile applications with REST APIs and backend services
Implement authentication, authorization, secure data storage, and session management
Develop features using native capabilities such as location, camera, push notifications, and device storage
Handle offline scenarios, caching, and data synchronization
Optimize application performance, stability, and resource usage
Troubleshoot and resolve defects, crashes, and platform-specific issues
Write and maintain unit and UI tests
Lead code reviews and contribute to mobile coding standards and best practices
Use GitHub Copilot and other approved AI-assisted development tools to improve productivity while ensuring code quality and correctness
Mentor mid-level and junior developers and collaborate with Product, QA, and Backend teams

Requirements

What you’ll need

At least 6 years of professional software development experience, including at least 4 years with React Native
Practical experience with Expo and the Expo ecosystem
Very good knowledge of JavaScript and TypeScript
Good understanding of React concepts, hooks, component architecture, and state management (e.g. Redux Toolkit, Zustand, React Query)
Experience with mobile navigation, local storage, and asynchronous data handling
Good understanding of iOS and Android platform differences and the mobile application lifecycle
Experience integrating with REST APIs and implementing authentication and secure storage
Experience with debugging and performance optimization of mobile applications
Experience with mobile testing tools (e.g. Jest, React Native Testing Library)
Practical experience using GitHub Copilot or similar AI-assisted development tools while maintaining responsibility for code quality and correctness
Experience with Git and code review processes
Good communication, collaboration, and mentoring skills

Benefits

Comp & perks

Premium medical package
Lunch Tickets & Pluxee Card
Bookster subscription
13th salary/yearly bonuses
Enterprise job security with a startup mentality (diverse & engaging environment, international exposure, flat hierarchy) under the stability of a secure multinational
A supportive culture with ownership, autonomy, healthy work-life balance, great colleagues, team events and activities
Flexible working program and openness to remote work
Collaborative mindset – employees shape their own benefits, tools, team events and internal practices
Diverse opportunities in Software Development with international exposure
Flexibility to choose projects aligned with your career path and technical goals
Access to leading learning platforms, courses, and certifications (Pluralsight, Udemy, Microsoft, Google Cloud)
Career growth & learning – mentorship programs, certifications, professional development opportunities, and above-market salary