Digital System Engineer

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.

THE OPPORTUNITY

The Digital Systems Engineer will lead the definition, development, and delivery of spacecraft On-Board Data Handling (OBDH) systems in support of Functional Avionics. The role covers digital avionics equipment for a Space customer across the full project lifecycle (Phases B-E), ensuring delivery in line with On Time, On Quality, On Cost (OTOQOC) objectives. The role works closely with Functional Avionics, system engineering, suppliers, and the customer, and reports operationally to the Electrical Systems (ELSYS) Lead.

• Own and deliver the OBDH work package, including hardware, firmware, models, and documentation
• Act as the primary technical point of contact for all OBDH-related matters
• Define OBDH requirements and architectures (functional and electrical) based on mission needs
• Specify and manage digital avionics equipment, including:
  • On-Board Computer (OBC)
  • Remote Interface Unit (RIU)
  • Mass Memory & Formatting Unit (MMFU)
  • Instrument Control Unit (ICU)
  • Other digital equipment as required (e.g. crypto/authentication units)
• Manage and co-engineer with suppliers, including MAIT activities
• Support system-level engineering, AIT, and launch campaign activities
• Contribute to continuous improvement and R&D initiatives

Essential

• Strong background in digital avionics engineering for spacecraft or complex embedded systems
• Experience with spacecraft data handling systems and spacecraft operations
• Proven experience across system lifecycle phases (B-E)
• Ability to work with multidisciplinary teams and external suppliers
• Strong communication and stakeholder-management skills

Desirable

• Experience with supplier co-engineering in a space or safety-critical environment
• Familiarity with system-level AIT and launch campaign support
• Exposure to functional avionics architectures and system engineering processes

• 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.