Software Engineer - C

SII Group; Redhill; On-site; GBP 45,000 - 60,000; Full time

Job summary

A technology services provider is seeking an experienced Software Engineer with strong expertise in C programming to enhance a mission-critical embedded communication system. The role involves modifying existing software, integrating new features, and ensuring high standards of reliability. The ideal candidate has a background in safety-critical software and familiarity with compliance processes. This position offers competitive salary, private medical insurance, flexible working, and continuous professional development opportunities.

Benefits

Competitive Basic Salary

Private Medical Insurance

Flexible working

Continuous professional development

Qualifications

• 5+ years of experience in C programming for embedded systems.
• Experience with software development processes and CI/CD.
• Familiarity with requirements management tools.

Responsibilities

• Review and modify existing software to improve functionality.
• Implement changes in C to support new communication features.
• Conduct testing and maintain design documentation.

Skills

Strong C programming background

Proficiency with BitBucket, Jira, Bamboo

Adhering to coding standards

Tools

Xilinx ISE

PowerPC toolchain

Altera Quartus

MSP430 CrossWorks

Job description

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.

Responsibilities

• Review and work with the existing baseline software (version 2.0).
• Implement modifications in C to:
  • Integrate and extend the dismounted call feature.
  • Remove reliance on legacy hardware.
  • Enable automatic call initiation and acceptance using IP and VoIP protocols.
  • Ensure consistent behaviour across multiple crew station types.
• 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.

Essential Requirements

• Strong C programming background, particularly for embedded systems.
• Experience with toolchains including:
  • Xilinx ISE, powerpc-eabi-gcc
  • Altera Quartus, nios2-elf-gcc
  • MSP430 CrossWorks (Rowley)
  • TI Code Composer Studio for DSP
• Proficiency with software development and CI/CD tools: BitBucket, Jira, Bamboo.
• Experience adhering to strict coding standards and compliance-driven processes.
• Familiarity with requirements/verification management tools (e.g. Polarion, TestRail).

Desirable Requirements

• Background in safety-critical or defence-related software development.
• Knowledge of VoIP and IP-based communication protocols.
• Experience contributing to formal design review processes.

Company Overview

SII Group delivers Digital Services, IT, Engineering, and Consulting to diverse industries, enabling digital transformation through our commitment to Growth, People, and CSR. 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. Since 2016, SII UK has supported top Aerospace & Defence, Aviation, Transportation, and Finance clients, empowering digital transformation with industry-leading engineering expertise. Let's Tech Together is our promise to encourage innovation and teamwork. We support our engineers with development opportunities and a collaborative, inclusive environment where every voice is valued and empowered.

Benefits

• Competitive Basic Salary
• 6% Employers 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 & TechScheme
• Continuous professional development
• Corporate access to the Udemy platform
• If you're applying for a role requiring security clearance, please be aware that foreign or dual nationality is not an automatic bar, however certain posts may have restrictions which could affect those who do not have sole British nationality or who have personal connections with certain countries outside the UK.