Lead Mobile Engineer

We are looking for a Lead Mobile Engineer to join a product team in Brussels and take a leading role in the evolution of its mobile applications.This is not simply a Flutter development position.We are looking for an experienced mobile engineer first, someone who has built and shipped mobile products, understands the challenges of mobile architecture and can make sound technical decisions across native, cross-platform or multiplatform environments.Flutter is at the core of the current mobile stack, so hands-on professional experience with Flutter is required. However, we are equally interested in engineers with a strong background in native mobile development, React Native, Kotlin Multiplatform or other mobile ecosystems who have successfully worked with Flutter.Your roleAs Lead Mobile Engineer, you will help define the technical direction of the mobile applications while remaining actively involved in development.You will work closely with the rest of the engineering team to build reliable, maintainable and scalable products.Your responsibilities will include:Defining and evolving the mobile architectureMaking technical decisions around application structure, performance and scalabilityDeveloping and improving Flutter applicationsMaintaining high standards for code quality, testing and engineering practicesReviewing code and supporting other engineers through mentoring and technical guidanceContributing to CI/CD and the overall delivery processCollaborating with backend and product teams on technical design and implementationIdentifying technical debt and helping define pragmatic solutionsContributing to discussions around security, observability and application performanceRemaining hands-on and close to the codeWhat we are looking forYou have solid professional experience building mobile applications and have already taken significant technical ownership within a team.You do not necessarily need to have spent your entire career working with Flutter. What matters most is having strong mobile engineering fundamentals and enough Flutter experience to lead technical decisions confidently.Ideally, you bring:Strong professional experience in mobile software engineeringHands-on professional experience with Flutter and DartPrevious experience with native, cross-platform or multiplatform mobile developmentA strong understanding of mobile architecture and software design principlesExperience making architectural and technical decisions on production applicationsExperience with code reviews, mentoring or technical leadershipA pragmatic approach to engineering and technical debtGood understanding of CI/CD and modern software delivery practicesAwareness of performance, scalability, observability and application securityThe ability and willingness to remain hands-on as a developerExperience with technologies such as Kotlin, Swift, React Native or Kotlin Multiplatform is highly relevant.Technical environmentThe current environment includes:Mobile: Flutter / DartBackend: TypeScript and FastAPICloud: Google Cloud PlatformCI/CD and modern cloud-based development practicesYou are not expected to be a backend or cloud specialist, but you should be comfortable collaborating across these areas and understanding how they interact with the mobile product.LanguagesEnglish is required.You should be comfortable communicating professionally in English in technical discussions, documentation and day-to-day collaboration.French is a strong advantage, as a significant part of the team is French-speaking.LocationThis is a Brussels-based position with regular collaboration from the office.For this search, we are focusing on candidates who are already based in Belgium and able to work regularly from the Brussels office. This position is therefore best suited to someone who is already established in Belgium rather than someone looking for an international relocation opportunity.The profile behind the titleThe title says Lead Mobile Engineer for a reason.We are not looking for someone whose expertise stops at a specific framework.We are looking for someone who understands mobile engineering broadly, can challenge technical decisions, bring structure to an evolving environment and help raise the engineering standard of the team while continuing to build products themselves.If you have a strong mobile background, have worked seriously with Flutter and are ready to take broader technical ownership, we would be happy to hear from you.