Senior Software Engineer – MCU

HS Design, Inc.; Bristol; On-site; GBP 66,558 - 81,349; Full time

Benefits offered by this job

Private healthcare for you and your:>

Salary exchange pension scheme

25 days of annual leave

Lunch benefits and team gatherings

Training and development opportunities

Job summary

Ensera Design is seeking a Senior Software Engineer – MCU to lead MCU firmware development for real‑time systems across hardware, Linux, UI, connectivity and test. You will own subsystem designs, safeguard security architecture, and drive high‑quality embedded C/C++ deliverables.

The role emphasizes collaboration with cross‑functional teams, adherence to coding standards, and a strong focus on secure development practices within a flexible hybrid work model in Bristol.

Qualifications

• Proven experience with ARM Cortex‑M or equivalent.
• Strong C/C++ in embedded, real‑time contexts.
• Experience in quality‑controlled or safety‑critical environments.
• Experience with STM32, bootloaders, MISRA, UART/SPI/I2C/CAN.

Responsibilities

• Design and implement MCU firmware aligned to system and security architecture.
• Own technical design of MCU subsystems.
• Develop and review embedded C/C++ for real‑time systems.
• Collaborate with hardware and software peers.
• Champion coding standards and secure development.

Skills

ARM Cortex-M

C/C++ (embedded)

Safety‑critical environments

STM32

Bootloaders

MISRA

UART/SPI/I2C/CAN

Job description

Bold ideas start with bold people. At Ensera Design, we are a world‑class, user‑centered innovation and product development consultancy working across medical and consumer health. Join our multidisciplinary team to build robust, secure firmware that powers life‑enhancing products.

We are currently seeking a Senior Software Engineer – MCU to join our talented team and contribute to delivering exceptional solutions for our clients.

You will lead the design and delivery of microcontroller (MCU) firmware for real‑time systems, owning technical decisions and collaborating across hardware, Linux, UI, connectivity and test to integrate complete solutions.

What you’ll do

• Design and implement MCU firmware aligned to system and security architecture.
• Own technical design of MCU subsystems.
• Develop and review embedded C/C++ for real‑time systems.
• Collaborate with hardware and software peers.
• Champion coding standards and secure development.

Your skills and experience

• Proven experience with ARM Cortex‑M or equivalent.
• Strong C/C++ in embedded, real‑time contexts.
• Experience in quality‑controlled or safety‑critical environments.
• STM32, bootloaders, MISRA, UART/SPI/I2C/CAN.

For this role we are considering a salary of up to £73,954. As part of your application, we will ask you to state your desired salary. If you would like to discuss your salary expectations in more detail, then please reach out.

Why work with us?

Ensera Design offers interesting and varied work combined with a supportive team culture to provide a stimulating environment where you will have the opportunity to develop and learn from others. We offer flexible working policies where working patterns are agreed with our line managers, taking into account the role, needs of the individual, and the team.

We recognise that we are only as good as our people and we know how important it is to support our team.

We offer:

• Performance‑related company‑wide bonus.
• Flexible hybrid working in line with our core hours (Mon–Thu, 9:30am–12:00pm & 2:00pm–4:00pm; Fri, 9:30am–12:00pm).
• Private healthcare for you and your family.
• Enhanced maternity and paternity leave.
• Salary exchange pension scheme.
• 25 days of annual leave, plus the option to purchase up to one working week and additional days for length of service.
• Access to our Employee Assistance Programme and digital wellbeing platform.
• Cycle to Work & Electric Vehicle Lease schemes.
• Death in service (x4 gross salary).
• Training and development opportunities, including dedicated learning days and regular knowledge‑sharing sessions.
• A free lunch the first Monday of every month alongside our company‑wide meeting.
• Free breakfast every Wednesday, and plenty of opportunities to socialise, including team‑organised activities, summer and Christmas parties, and more.

About us

We are based in an iconic Grade II listed building in the heart of Bristol. Our vibrant workspace houses state‑of‑the‑art labs, a design studio, usability suites, and collaborative meeting spaces. Nestled in a lively neighbourhood with independent shops, we’re just a short walk from Park Street, the Harbourside, and St. Nick’s Markets.

We are proud of our values:

• Find a way: We work as one team, combining our knowledge and experience to unite around a shared goal. We trust each other and do what’s needed to get things done and exceed expectations.
• Pull together: We believe anything is possible. When faced with challenges we take the initiative, using our creative spirit and determination to find bold solutions and deliver results that move us forward.
• Care: We act with integrity, take pride in our work, and support each other. We each play our part to make a positive impact for our customers, our colleagues, and our planet.

Our diverse, multidisciplinary team spans research, design, human factors, engineering, prototyping, manufacturing, and beyond. Together, we deliver cutting‑edge solutions for clients ranging from global leaders to innovative start‑ups, with a particular focus on medical devices, drug delivery, orthopaedics, and diagnostics.

If you meet the skills and experience for this role, we welcome your application – whatever your background, identity, or path into design. What matters to us is that you share our belief in purposeful, people‑first design.