Senior Mobile App Developer (Kotlin)

Project Information

• Type of project: IT Service
• Work model: 100% remote
• Budget: 170–210 PLN net/hour on B2B
• Project length: Long-term
• Start date: ASAP, depending on availability
• Experience level: 7+ years of software development experience
• Only candidates from Poland
• Ability to participate in occasional late meetings aligned with US working hours

Description

Design, develop, and maintain enterprise-grade Android applications using Kotlin and modern Android development practices. Work closely with international commercial and development teams to deliver secure mobile solutions, backend integrations, performance optimization, and high-quality user experiences.

Responsibilities

• Design, develop, and maintain scalable Android mobile applications using Kotlin.
• Build enterprise-grade mobile solutions following modern Android development practices.
• Work with Kotlin Multiplatform where applicable and contribute to cross-platform mobile development.
• Utilize Android SDK and Jetpack components to develop robust mobile applications.
• Implement asynchronous programming using Kotlin Coroutines and Flow.
• Apply MVVM and modern mobile application architecture patterns.
• Integrate mobile applications with REST APIs and backend services.
• Implement secure authentication and authorization mechanisms.
• Ensure mobile applications meet security, accessibility, and usability best practices.
• Optimize application performance and troubleshoot technical issues.
• Implement monitoring and diagnostics to ensure application reliability.
• Develop and maintain automated tests using JUnit, Espresso, and UI automation tools.
• Collaborate with backend developers, architects, product owners, and other stakeholders.
• Participate in Agile, Scrum, or SAFe ceremonies and cross-functional development activities.
• Contribute to code reviews and follow modern software development practices.
• Support and maintain applications throughout their lifecycle.

Requirements

• 7+ years of professional software development experience, including significant experience with Android mobile applications.
• Expert-level knowledge of Kotlin and modern Android development practices.
• Strong experience with Kotlin Multiplatform is preferred.
• Experience with Kotlin and some Swift development may be considered where Kotlin Multiplatform experience is limited.
• Strong knowledge of the Android SDK and Jetpack components.
• Hands-on experience with Kotlin Coroutines and Flow.
• Strong understanding of MVVM and modern mobile application architecture.
• Experience building scalable, secure, and maintainable enterprise-grade mobile applications.
• Strong experience integrating mobile applications with REST APIs and backend services.
• Good understanding of authentication, authorization, and mobile security.
• Deep knowledge of mobile application performance optimization, monitoring, and troubleshooting.
• Experience implementing accessibility and usability best practices.
• Hands-on experience with testing frameworks such as JUnit and Espresso.
• Experience with UI automation testing tools.
• Experience working in Agile, Scrum, or SAFe environments.
• Ability to collaborate effectively within complex, cross-functional teams.
• Excellent communication skills in English.
• Ability to work independently and collaboratively in an international environment.
• Flexibility to participate in meetings during US working hours.

Nice to Have

• Experience with WebView development and integration.
• Experience integrating third-party identity providers such as Microsoft Entra, Auth0, or Okta.
• Understanding of OpenID Connect authentication flows.
• Knowledge of FIDO2 and passkey authentication.
• Experience implementing biometric authentication.
• Experience developing multilingual mobile applications, including support for English and Spanish.
• Knowledge of Azure, Firebase, App Center, or similar mobile/cloud platforms.
• Experience working in healthcare, medtech, or other regulated industries.

Benefits

• 100% remote working model.
• Full-time cooperation agreement based on B2B.
• Private medical care with dental care, covering 70% of costs.
• Multisport card, also for an accompanying person.
• Life insurance.
• Opportunity to work in an international IT environment.

Recruitment Process

• Introductory call
• Technical interview
• Final decision