Mobile engineer (mobile developer)

A mobile engineer, or mobile developer, is a software development specialist who turns a functional requirement into a mobile application. They design, program and develop the application further, then help make it reliable through testing and fixing defects. Their work may focus on a new product or an existing application.

The role covers activities ranging from defining the technical scope to maintenance. This does not mean that one person makes every decision about the product alone. Depending on the organisation, the developer receives a specification, helps refine it or has greater autonomy to propose technical choices. They may work with the project manager, designers, security specialists and the people who articulate the product requirements.

The technical environment is part of the role's definition. An application may use platform-specific tools or a cross-platform framework. Sharing code between systems does not eliminate all platform-specific features: Flutter, for example, allows calls to platform-specific code in Kotlin or Swift.

Mobile engineer, web developer and backend developer: who does what?

• The mobile engineer works on the mobile application, its interfaces, its communication with services and its behaviour on the relevant platforms.
• The web developer may design an interface suited to a mobile browser. This experience alone does not demonstrate proficiency in native applications.
• The backend developer works on the server side. Connecting the application to an API and developing the server are two activities that need to be distinguished when allocating work.

Finally, management is not inherent in the job title. A mobile engineer may join a team or take on coordination responsibilities. Specify their technical decisions, the activities they oversee and any people management responsibilities separately.

A mobile application must remain usable beyond the ideal user journey shown in a demonstration. Interface quality, secure communication with servers, performance and resolving defects are among the technical challenges of the role. Recruitment therefore needs to take account of the situations in which the application will be used and maintained.

Preserving the application's expected behaviour

On Android, architecture recommendations take account of configuration changes and component destruction, among other things. Separating the interface from the data, along with persistence, helps preserve application state and manage intermittent connectivity. These mechanisms illustrate why an interface that works in a demonstration is not enough to assess the product's technical quality.

Hypothetical example: a team is preparing an Android application for use with an unreliable connection. Before recruiting, it specifies which data must remain available and how the application should behave during an interruption. These details help the team look for relevant experience in state management and persistence, then design an appropriate exercise.

Planning for changes without undermining existing functionality

Unit and regression tests check how the application works and the effects of changes. Diagnosis and performance analysis complement this approach. Recruiting solely on the ability to produce a new interface would overlook the ability to understand a defect, fix it and check the result.

Another significant decision concerns sharing code between platforms. This needs to be considered alongside the platform-specific features to be integrated and the existing code. No framework inherently removes the need to understand the underlying platforms. Finally, clarifying responsibilities for the application, server and security avoids implicitly expecting one person to have skills or authority that have not been defined.

• Translate functional requirements into implementation choices suited to the mobile application.
• Design the application architecture within the responsibilities assigned to the role.
• Develop user-friendly mobile interfaces.
• Implement secure communication between the application and server-side services.
• Write and run unit and regression tests.
• Diagnose defects and performance issues in the application.
• Prepare application deployment using the relevant platform tools.
• Handle fixes and further development after delivery.
• Document technical choices to support knowledge transfer.

Software development courses can provide useful foundations for the role: programming, understanding a requirement and building an application. Onisep lists French qualifications including the BTS SIO, BUT informatique, master and diplôme d’ingénieur specialising in programming. These routes do not constitute a single mandatory pathway. Nor do their titles alone establish proficiency in native mobile development.

Useful learning combines design with practical work. It includes organising code and data, developing user-friendly interfaces and secure communication with server-side services. For mobile development, these capabilities apply within a specific environment: platform-specific tools or a cross-platform framework. Learning therefore covers both building an application and the constraints of its target platforms.

Practical work is not limited to creating features. Writing tests, investigating the cause of a defect and checking a fix are also useful skills to acquire. Documenting technical choices prepares developers to hand over their work and collaborate on an application. These capabilities also cover further development of an existing product.

Continuing education and work-study programmes are among the routes provided for in the related French framework for web and mobile web development. There is a limit to this overlap: designing a web interface suited to phones does not involve the same learning as developing a native application. Course content and completed work therefore give a more precise indication of specialisation than the word “mobile” alone in a programme description.

The foundation of GetPro's assessment method

GetPro prepares the assessment using a framework that prioritises essential skills and desirable knowledge and experience. Each criterion is linked to an assessment method. The framework distinguishes information available from the candidate's background from skills that require a discussion or test. It guides interviews towards the points that still need clarification.

Discussions draw on open questions and concrete examples. Reference checks complement this analysis by exploring the context in which people worked together and the skills that need further examination. The assessments gathered are supported by situations the referees have experienced.

This foundation is common to recruitment assignments. For a mobile engineer, the criteria and exercises below are suggestions for the employer, to be adapted to the platforms and responsibilities of the role.

1. Define the criteria before the interviews

Separate the skills essential on starting the role from those that can be acquired with support. Specify the technical environment, the place of testing and the responsibility expected in architectural decisions.

Build a simple assessment framework around development, service integration, diagnosis and communication. For each criterion, indicate what the person will need to do independently and what they can have reviewed and approved.

Involve a technical colleague in this preparation. If no one in the company knows the platform well enough, seek an expert who can examine the candidate's code and reasoning.

2. Examine a project and the candidate's personal contribution

Ask the candidate to present an application they have worked on without disclosing confidential information. Ask them to specify which parts they developed, which decisions they contributed to and whom they worked with.

Then choose a concrete problem encountered on that project. Ask how they investigated the cause, selected a fix and checked its effect. This will help you distinguish the team's result from their contribution.

A precise account linking the problem, action and checks is a positive sign. A presentation limited to visible features, with no explanation of the candidate's own work, calls for further questions.

3. Offer an exercise close to the expected work

Prepare an exercise focused on one responsibility of the role. You could ask the candidate to examine a defect, complete a test or explain how a small part of an application is organised.

Hypothetical example: for an Android role, provide a case involving loss of state after a configuration change. Ask the candidate to describe their diagnostic approach and the checks they would plan.

Observe the hypotheses they put forward, their use of tools and how they check a fix. Do not assess only whether they reach a final result: ask them to explain the solution's limitations and what still needs testing.

An approach that links symptoms to checks is a positive sign. Repeated changes without a hypothesis or a check of the result warrant further discussion with the candidate.

4. Assess cooperation and leadership responsibilities

Ask the candidate to explain a technical choice to a non-specialist. Observe whether they make the consequences understandable and distinguish what they can decide from matters to discuss with other contributors.

If the role includes leadership responsibilities, ask about a situation in which they organised work or allocated a project's resources. Examine this experience separately from development skills.

Look for explanations that identify each person's responsibilities. If all decisions are attributed indiscriminately to the developer, clarify their actual role.

5. Bring the evidence together before deciding

Compare the projects presented, the exercise and the discussions against your initial assessment framework. Record the points demonstrated and those for which you still lack evidence.

If you obtain references with the candidate's consent, focus your questions on the responsibilities described and the working relationships mentioned. Use these discussions to shed light on your findings, without letting them replace the technical assessment.

Finally, decide whether the skills observed match the autonomy required by the role. Where knowledge or skills still need developing, specify who can support the person and in which activities.