Job Summary: Onalabs is seeking a Senior Flutter Developer to develop and maintain mobile applications for Android and iOS, playing a key role in communication with BLE devices. Key Highlights: 1. Key role in developing Flutter apps for Android and iOS. 2. Implementation and optimization of BLE communication. 3. Collaboration with multidisciplinary teams and professional growth. Senior Flutter Developer – On-site in Barcelona | Onalabs – Submit your CV to the email address below. Onalabs is a technology company located at Parc Tecnològic del Vallès (Cerdanyola del Vallès, Barcelona), specializing in developing connected devices for health and sports performance monitoring. We combine proprietary hardware, embedded firmware, and mobile applications to deliver comprehensive solutions in healthcare and sports. We are looking for a Senior Flutter Developer to join our mobile applications team. The selected candidate will play a key role in developing and maintaining our Android and iOS apps, which communicate with our devices via Bluetooth Low Energy (BLE). Main Responsibilities: * Participation across the entire software lifecycle. * Development and maintenance of Flutter apps for Android and iOS. * Implementation and optimization of BLE communication. * Integration of REST APIs. * Development of tests and CI/CD automation. * Release management and app store publishing. * Collaboration with firmware and electronics teams. * Working in agile sprints and conducting code reviews. Essential Requirements: * Experience in mobile development. * Solid experience with Flutter and Dart. * Demonstrable experience with BLE. * Experience with GitHub Actions and CI/CD. * Integration of REST APIs. * Experience with Git/GitHub and Jira. * Fluent Spanish and technical English. Preferred Qualifications: * Experience with wearables, IoT, or health devices. * Knowledge of regulated environments (ISO 13485, MDR/FDA). * Published apps on Play Store / App Store. * Mobile architectures (BLoC, MVVM, Clean Architecture). * Docker, Kotlin/Java, Swift/Objective-C, Python, JS/TS. * Professional use of AI tools. What We Offer: * Technical and multidisciplinary work environment. * Professional growth within an expanding team. * Competitive compensation tailored to the candidate’s profile. Contact Email: a.majos@onalabs.com Position Type: Full-time Salary: 20.000,00€–30.000,00€ per year Application Questions: * Are you present in Barcelona and can work on full time basis on site? Language: * Spanish (Mandatory) * English (Mandatory) Work Location: On-site