Software Architect

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. 

#Let'sTechTogether 

THE OPPORTUNITY 

We are seeking a highly experienced Senior Software Engineer with professional experience to join our team delivering large-scale, distributed, and safety-critical software systems. This role is ideal for an engineer who thrives in complex environments, values engineering rigour, and enjoys working across the full software lifecycle. You will play a key role in the design, development, integration, and assurance of high-integrity software, working closely with architects, project management, and wider engineering teams to ensure delivery against cost, quality, and schedule.  

KEY RESPONSIBILITIES: 

• Design and develop distributed systems using C/C++ and Java

• Deliver software across the full lifecycle, from design to deployment

• Develop and debug software on Linux and Windows targets

• Apply high-integrity coding practices, including unit testing and static analysis

• Support software safety activities, including Software FMEA and safety compliance

• Produce clear, accurate technical documentation

• Contribute to CI/CD pipelines, build systems, and configuration management

• Collaborate with architects, project management, and engineering teams to deliver to cost, quality, and schedule.  

ESSENTIAL SKILLS & EXPERIENCE: 

• Strong experience in C/C++ and Java

• Large-scale distributed system design

• Experience with Linux-based development

• Knowledge of software architectures and TCP/IP networking Experience with:

o Unit and wider software testing

o Static analysis and secure/high-integrity coding standards (e.g. MISRA, JSF++, AUTOSAR)

o CI/CD tools (e.g. Jenkins, Git)

o Containers and orchestration (Docker, Kubernetes)

o This role requires SC clearance (UK Eyes Only). 

DESIRABLE SKILLS: 

• UML modelling and software design tools (e.g. Rhapsody, Enterprise Architect)

• Defence sector experience

• Model-driven development and MATLAB/Simulink

• DevOps, Infrastructure as Code (e.g. Ansible), and GPU programming

• Software assurance, SBOM tooling, and cyber security awareness  

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.