Embedded systems engineer

An embedded systems engineer designs, develops, integrates and maintains the software that makes a device work. They translate the expected product functions into specifications and code, then test that code against the hardware. Their work takes account of processor architecture, electronic interfaces and expected performance, particularly response times and energy consumption.

The titles embedded software engineer and embedded development engineer can describe this work. Firmware engineer can describe a role closer to the hardware. Boundaries vary between companies, so a title alone does not establish the responsibilities. In Silicon Mobility’s automotive example, low-level software includes drivers and BSPs, the software components that support a hardware board.

This profile covers software and its computing integration. It excludes mobile application development and electronic design alone. Understanding a board’s characteristics and discussing them with its designers are part of the software need. Designing the whole board adds responsibilities that must be specified separately.

Embedded systems engineer, electronics engineer and embedded architect: who does what?

• The embedded systems engineer implements software functions, contributes to their integration and explains test results.
• The electronics engineer works on the hardware. Clarify with them the interfaces the software must use and the characteristics relevant to development.
• The embedded architect works on architecture choices. Clarify which decisions belong to them and which the developer can make within the agreed framework.

Architecture, programming, integration and validation may be combined in one role or divided between several roles. The engineer works with hardware teams and other technical specialists. To define their reporting arrangements, identify who is responsible for software choices, who accepts validation results and which colleagues are available during debugging and refinement. This allocation matters more than an assumed equivalence between titles.

This hire affects the ability to make the software work under the conditions intended for the product. A convincing implementation on a computer does not establish how it will behave on the device. Integration and testing on real hardware are part of the work, using test benches and procedures that depend on the product.

Start by specifying what the software must achieve: expected functions, response times and energy consumption to assess. Describe the available hardware too. This information helps distinguish programming skills from the ability to design and debug embedded software in your environment.

Real-time requirements need a precise definition. A real-time constraint sets a deadline. Whether it is soft or hard depends on the consequences of missing it. Not all embedded devices therefore require hard real-time behaviour. When recruiting, specify the events the system must respond to and what happens when a response is late.

Hypothetical example: a team is developing a measurement device whose software must acquire and communicate data. It needs an engineer who can explain the hardware interfaces and measure behaviour on the target. If it assesses only the quality of a general programming exercise, it leaves the question of product integration unanswered.

Another risk is combining several responsibilities without providing the relevant colleagues to work with. Asking one person to define the architecture, develop and validate requires clarity about the decisions they will make alone and the reviews they will take part in. Also specify who handles faults and changes after delivery.

Finally, adapt quality and validation expectations to the product. Testing, static analysis and formal verification can contribute to validation, depending on criticality. A sector practice or possible certification does not become a general requirement. Define the results to be delivered before adding technologies and requirements to the job advert.

• Analyse product needs to formalise the functional and technical requirements for the embedded software.
• Design the software solution, taking account of the hardware architecture and expected performance.
• Develop embedded functions in languages suited to the product.
• Define software interfaces with hardware specialists.
• Integrate the software into the device with the other technical teams.
• Design and carry out tests for debugging, refinement and validation.
• Diagnose faults and optimise software execution.
• Document technical choices and test results for subsequent development.
• Provide fixes and further development for the embedded software.

French master’s degrees and engineering diplomas in embedded computing, industrial computing, electronics or related fields are documented routes. They indicate a learning framework without, on their own, establishing readiness for your role. Do not make them a universal condition if the work can be demonstrated in another way.

Examine the knowledge and skills relevant to your product: hardware understanding, software design, programming, debugging and validation. A project combining a sensor, a microcontroller and software processing can address several of these dimensions. Ask the candidate to distinguish what they designed, what they reused and what their partners produced.

The EIDD programme provides an example of training that assesses embedded projects, reports, presentations and internships. These achievements can help explain what someone has learnt. They do not automatically amount to experience of independent development in a company. A report becomes useful when it explains the initial requirements, the choices made and the results achieved.

For a beginner, look for a piece of work they can explain and specify the technical reviews and support available. For an autonomous engineer, examine responsibilities already held: software choices, target integration, diagnosis and fault correction. For a technical lead, add technical coordination, reviews and support for other engineers.

The relevance of a background also depends on the role’s environment. Embedded Linux experience alone does not demonstrate mastery of priorities, synchronisation and interrupts under an RTOS. Describe the learning needed and the skills already essential, rather than assigning a level based on a number of years.

To assess this profile, you can adapt the following stages to the product, the available hardware and the responsibilities actually assigned.

1. Define the criteria before interviews

Describe the expected software functions, the target hardware and response constraints. Specify the runtime environment: embedded Linux, an RTOS or operation without an operating system. Separate skills needed from day one from those that can be acquired with the team.

Build an assessment grid around design, programming, diagnosis and validation. Add the expected level of autonomy for each activity. Identify decisions to refer to the architect or electronics team.

A positive sign is experience the candidate can relate to the role’s requirements. A list of tools without an explanation of the functions implemented calls for further discussion.

2. Examine past work

Ask the candidate to present an embedded development project and their personal contribution. Have them explain the requirements, hardware interfaces, software choices and tests carried out. Accept an anonymised explanation when documents cannot be shared.

Explore an incident: which observations triggered the diagnosis, which hypotheses were tested and how was the fix validated? Look for a clear distinction between measured facts and interpretations.

For an RTOS role, ask how tasks exchanged data, how their priorities were defined and how interrupts were handled. A relevant answer explains the previous system’s constraints and the limits of applying that experience to yours.

3. Offer a case close to the expected work

Choose an exercise where the information and hardware allow a reasonable answer. Assess the approach as well as the code. If the target is unavailable, specify which conclusions will still need to be checked on the device.

Hypothetical example: measurement software sometimes transmits a data item after the expected deadline. Provide a description of the tasks and interfaces, along with some observations. Ask the candidate to propose a diagnosis and the measurements needed to distinguish between their hypotheses.

Look for questions about requirements and test conditions. A warning sign is an immediate fix with no investigation of the cause or planned verification. Avoid turning the case into a test of knowledge of a tool unrelated to your product.

4. Examine the validation strategy

Ask which tests would cover the expected functions and how their results would be documented. Have the candidate distinguish simulation, a prototype and testing on real hardware. These do not demonstrate the same behaviour.

Adapt the questions to the product’s criticality. Validation can combine testing, static analysis and formal verification. Ask the candidate to justify the methods they know and their contribution in the context presented.

A positive sign is a conclusion tied to a requirement and an observable result. A warning sign is a claim that everything has been validated without specifying the test conditions or limitations.

5. Assess cooperation and confirm responsibilities

Arrange a discussion with a hardware or validation colleague. Ask the candidate to explain a difficulty and the information they would need. Observe whether they make their reasoning understandable and identify decisions to share.

If the role includes coordination, explore reviews, work organisation and support for junior engineers. With the candidate’s consent, request references focused on their contribution and autonomy.

If your company lacks embedded expertise, have the past work and exercise examined by a specialist in the relevant field. Keep the assessment of the need, communication and responsibilities to assign with the business leader or HR team.