Senior System Engineer

Senior System Engineer – Leidos UK

Clearance: Must be eligible for DV clearance (British Citizen, UK residency last 10 years).

Leidos is a global leader in integrating and applying information technology, engineering, and science to solve customers’ most demanding challenges. We deliver mission‑focused solutions across cloud, enterprise IT, data centre modernization, operational technology, and cyber security, including end‑to‑end cyber integration and high‑grade encryption.

We are hiring a security‑cleared System Engineer based in the UK, working at customer sites across Avon, Gloucestershire, and Herefordshire.

We are seeking an experienced, technical System Engineer to join our delivery team, supporting a range of projects from small electronic prototypes with embedded software to complex on‑premise and cloud systems projects.

Key responsibilities include:

• Oversee the full lifecycle of technical information systems, from initial development to successful delivery.
• Engage with customers to understand requirements and tailor solutions to their needs.
• Conduct security reviews and assessments to ensure systems meet operational and security requirements.
• Liaise with government agencies, law enforcement, and military stakeholders to ensure compliance with regulatory frameworks and security protocols.
• Help define the engineering lifecycle for each project and ensure relevant engineering tasks are delivered appropriately.
• Conduct feasibility studies and risk assessments to determine optimal system design solutions.
• Create and maintain detailed system design documentation, including specifications, diagrams, and interface definitions.
• Support the validation and verification of system designs.
• Collaborate with multidisciplinary teams to ensure seamless integration of hardware, software, and network components.
• Identify opportunities for system improvements and drive the implementation of best practices in design and integration.
• Support project planning and estimation activities related to systems design and integration tasks.
• Ensure compliance with relevant industry standards, safety regulations, and quality assurance processes.

• Strong understanding of systems engineering methodologies, lifecycle management, and design principles.
• Excellent analytical, organisational, problem‑solving, and communication skills.
• Demonstrated ability to manage multiple priorities and work effectively in cross‑functional teams.
• Experience in system development and delivery, including technical information systems.
• Ability to work with several stakeholders and suppliers across organisational boundaries.
• Experience developing system behavioural diagrams, modelling interfaces, and developing models to encapsulate functional requirements.
• Experience conducting detailed systems engineering trade solutions to assess options, feasibility, and define optimal solutions.
• Ability to work under pressure and adapt to fast‑changing environments.

• Proven experience leading teams in multidisciplinary settings, particularly in developing tools for covert operations.
• Previous experience working with government agencies, law enforcement, and/or military organisations.
• Strong digital collection, cyber exploitation, and security vulnerability management knowledge.
• Experience conducting security reviews and risk assessments.
• Familiarity with industry‑standard security frameworks and regulations.
• Demonstrable commitment to sharing ideas, technologies, and best practices.
• Willingness to offer fresh, innovative ideas and/or unconventional approaches.
• Ability to deliver clear messages through dialogue, written work, and formal presentation.
• Knowledge of secure‑by‑design guidelines.

Due to the nature of the work, the majority will be conducted on customer sites, with only a small amount of remote working possible.

We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone. If…