Systems/Software 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 , Commitment, Accountability, Passion, Creativity, and Transparency 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 We are looking for a Systems Engineer with a strong software background to support the development and enhancement of a mission-critical embedded communication system used across military vehicles. This role requires bridging software, hardware, and systems integration, ensuring that intercom and IP-based communication features meet stringent defence standards for reliability, safety, and compliance.KEY RESPONSIBILITIES: Work with the baseline software and system architecture (v2.0), analysing interactions across embedded hardware, firmware, and communication subsystems.Define and implement system-level modifications to: Extend dismounted call capabilities and align with vehicle/crew configurations.Retire dependencies on legacy hardware through re-architected solutions.Integrate IP/VoIP-based call management, including auto-initiation and acceptance.Ensure interoperability and consistency across heterogeneous crew stations.Specify, review, and validate system requirements, maintaining full traceability.Lead and participate in structured design reviews (System, PDR, CDR, FAT), ensuring alignment with safety and compliance frameworks.Support updates to operator-facing interfaces (HMI and web configuration) from a system behaviour perspective.Collaborate with verification engineers on integration and regression testing, ensuring system-level acceptance criteria are met.Produce and maintain system design documentation, test evidence, and compliance artefacts for customer and certification authority review.Coordinate with cross-disciplinary teams (hardware, FPGA, DSP, comms) to deliver end-to-end system solutions.EXPERIENCE AND SKILLS: Strong foundation in embedded software engineering (C), with the ability to reason at both code and system integration levels.Experience with embedded development toolchains (e.g., Xilinx ISE, Altera Quartus, MSP430 CrossWorks, TI Code Composer).Familiarity with requirements and verification management tools (e.g., Polarion, TestRail). Proven experience in requirements-driven, compliance-focused engineering within safety-critical or defence programmes.Proficiency with engineering toolchains and CI/CD workflows (BitBucket, Jira, Bamboo).Knowledge of IP networking, VoIP, and real-time communications protocols.Background in safety-critical or defence-certified software/hardware systems (e.g., DEF-STAN, DO-178C, MISRA).Experience working across system-of-systems environments, managing interfaces and trade-offs between hardware, firmware, and software.Contribution to certification, assurance, or acceptance processes in defence or aerospace.BENEFITS: Competitive Basic Salary6% Employers Contribution + 6% as a salary sacrificePrivate Medical Insurance, Life Cover and Income Protection25 days holiday5 days full sick pay per yearCycle to Work & TechSchemeCorporate access to the Udemy platformIf 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.

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