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 role As 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 architecture
Making technical decisions around application structure, performance and scalability
Developing and improving Flutter applications
Maintaining high standards for code quality, testing and engineering practices
Reviewing code and supporting other engineers through mentoring and technical guidance
Contributing to CI/CD and the overall delivery process
Collaborating with backend and product teams on technical design and implementation
Identifying technical debt and helping define pragmatic solutions
Contributing to discussions around security, observability and application performance
Remaining hands-on and close to the code
What we are looking for You 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 engineering
Hands-on professional experience with Flutter and Dart
Previous experience with native, cross-platform or multiplatform mobile development
A strong understanding of mobile architecture and software design principles
Experience making architectural and technical decisions on production applications
Experience with code reviews, mentoring or technical leadership
A pragmatic approach to engineering and technical debt
Good understanding of CI/CD and modern software delivery practices
Awareness of performance, scalability, observability and application security
The ability and willingness to remain hands-on as a developer
Experience with technologies such as Kotlin, Swift, React Native or Kotlin Multiplatform is highly relevant.
Technical environment The current environment includes:
Mobile: Flutter / Dart
Backend: TypeScript and FastAPI
Cloud: Google Cloud Platform
CI/CD and modern cloud-based development practices
You 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.
Languages English 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.
Location This 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 title The 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.