Senior Mobile App Developer (Kotlin)

At Cyclad, we work with top international IT companies to help them deliver cutting-edge technologies that shape the future. We are currently looking for an experienced Senior Mobile App Developer to join an international team delivering modern, secure, and scalable mobile applications.In this role, you will design, develop, and maintain enterprise-grade Android applications using Kotlin and modern Android development practices. You will work closely with international commercial and development teams, contributing to secure mobile solutions, backend integrations, performance optimization, and high-quality user experiences. The role requires flexibility to attend meetings during US working hours.Project information:Type of project: It ServiceOffice location: Wrocław, PolandWork model: 100% RemoteBudget: 170–210 PLN net/hour – B2BProject length: Long-termStart date: ASAP (depending on the candidate's availability)Experience level: 7+ years of software development experienceOnly candidates from PolandAbility to participate in occasional late meetings aligned with US working hoursYour responsibilities:Design, develop, and maintain scalable Android mobile applications using KotlinBuild enterprise-grade mobile solutions following modern Android development practicesWork with Kotlin Multiplatform where applicable and contribute to cross-platform mobile developmentUtilize Android SDK and Jetpack components to develop robust mobile applicationsImplement asynchronous programming using Kotlin Coroutines and FlowApply MVVM and modern mobile application architecture patternsIntegrate mobile applications with REST APIs and backend servicesImplement secure authentication and authorization mechanismsEnsure mobile applications meet security, accessibility, and usability best practicesOptimize application performance and troubleshoot technical issuesImplement monitoring and diagnostics to ensure application reliabilityDevelop and maintain automated tests using JUnit, Espresso, and UI automation toolsCollaborate with backend developers, architects, product owners, and other stakeholdersParticipate in Agile/Scrum/SAFe ceremonies and cross-functional development activitiesContribute to code reviews and follow modern software development practicesSupport and maintain applications throughout their lifecycleRequirements:7+ years of professional software development experience, including significant experience with Android mobile applicationsExpert-level knowledge of Kotlin and modern Android development practicesStrong experience with Kotlin Multiplatform is preferredExperience with Kotlin and some Swift development may be considered where Kotlin Multiplatform experience is limitedStrong knowledge of the Android SDK and Jetpack componentsHands-on experience with Kotlin Coroutines and FlowStrong understanding of MVVM and modern mobile application architectureExperience building scalable, secure, and maintainable enterprise-grade mobile applicationsStrong experience integrating mobile applications with REST APIs and backend servicesGood understanding of authentication, authorization, and mobile securityDeep knowledge of mobile application performance optimization, monitoring, and troubleshootingExperience implementing accessibility and usability best practicesHands-on experience with testing frameworks such as JUnit and EspressoExperience with UI automation testing toolsExperience working in Agile, Scrum, or SAFe environmentsAbility to collaborate effectively within complex, cross-functional teamsExcellent communication skills in EnglishAbility to work independently and collaboratively in an international environmentFlexibility to participate in meetings during US working hoursNice to have:Experience with WebView development and integrationExperience integrating third-party identity providers such as Microsoft Entra, Auth0, or OktaUnderstanding of OpenID Connect authentication flowsKnowledge of FIDO2 and passkey authenticationExperience implementing biometric authenticationExperience developing multilingual mobile applications, including support for languages such as English and SpanishKnowledge of Azure, Firebase, App Center, or similar mobile/cloud platformsExperience working in healthcare, medtech, or other regulated industriesWe offer:100% remote working modelFull-time cooperation agreement based on B2BPrivate medical care with dental care (covering 70% of costs)Multisport card (also for an accompanying person)Life insuranceOpportunity to work in an international IT environmentRecruitment process:Introductory callTechnical interviewFinal decision