Software Engineer - C

Software Engineer – Embedded Systems

SII Group delivers Digital Services, IT, Engineering, and Consulting to diverse industries. With over 16,000 professionals across 21 countries, we’re recognised as a “Great Place to Work” for fostering a high-trust culture. Our core values of Trust
, Transparency
, and Quality drive our work package delivery, ensuring we meet and exceed client expectations as a committed partner.

In 2016, SII UK supported top Aerospace & Defence, Aviation, Transportation, and Finance clients, empowering digital transformation with industry-leading engineering expertise. We support our engineers with development opportunities and a collaborative, inclusive environment where every voice is valued and empowered.

We are looking for an experienced Software Engineer with strong C programming expertise to support the development of a mission‑critical embedded communication system used in military vehicles. The role involves extending and modifying an existing codebase to improve intercom functionality, integrating IP‑based communication features, and ensuring software is delivered to high standards of reliability and compliance.

• Review existing baseline software (version 2.0).
• Implement modifications in C to integrate and extend the dismounted call feature, remove reliance on legacy hardware, and enable automatic call initiation and acceptance using IP and VoIP protocols.
• Update user interfaces (HMI and web configuration pages) to support new functionality.
• Conduct unit, integration, and regression testing against defined requirements.
• Participate in structured design reviews (System, Preliminary, Critical, Factory Acceptance).
• Maintain clear and accurate design documentation, test reports, and review minutes.
• Collaborate with verification engineers and project teams to ensure compliance.
• Deliver all source code, compiled load files, and supporting materials securely.

• Strong C programming background for embedded systems.
• Experience with tool chains including Xilinx ISE, powerpc‑eabi‑gcc, Altera Quartus, nios2‑elf‑gcc, MSP
  430 Cross Works, and TI Code Composer Studio.
• Proficiency with CI/CD tools:
  Bit Bucket, Jira, Bamboo.
• Experience adhering to strict coding standards and compliance‑driven processes.
• Familiarity with requirements/verification management tools (e.g. Polarion, Test Rail).
• Background in safety‑critical or defence‑related software development (desirable).
• Knowledge of VoIP and IP‑based communication protocols (desirable).
• Experience contributing to formal design review processes (desirable).

• Competitive Basic Salary
• 6% Employer Contribution + 6% as a salary sacrifice
• Private Medical Insurance, Life Cover and Income Protection
• 25 days holiday
• 10 days full sick pay per year
• Flexible working
• Cycle to Work & Tech Scheme
• Continuous professional development
• Corporate access to the Udemy platform

Applicant confidentiality and compliance. If you require a security clearance, please note that foreign or dual nationality is not an automatic bar; however certain posts may have restrictions that could affect those who do not have sole British nationality or who have personal connections with certain countries outside the UK.