Senior Systems Security Engineer

Raytheon UK; High Wycombe; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Raytheon UK is seeking a Senior Systems Security Engineer for the Training Services Delivery programme in High Wycombe. The role focuses on functional security governance across the FJCAST delivery team, developing secure systems and SbD policies while ensuring cost, quality, and safety compliance.

Responsibilities include leading security architecture work, interacting with customers, and supporting bids and proposals within a hybrid work environment.

Qualifications

• Bachelor of Science in STEM with 10+ years of relevant experience, or MSc in related field with 7+ years of experience.
• Evidence of Security/Cyber Security requirements, design and architecture artifacts.
• Experience in Information Assurance and security testing for Authority to Operate (ATO).
• Technical leadership experience in systems security engineering and MoD/ GovS security contexts.
• Familiarity with RMF and STRIDE, and security documentation standards.

Responsibilities

• Perform Task Lead duties (planning, product ownership, scrum master).
• Develop a Security RMF following STRIDE model.
• Create Secure by Design planning and SbD policies for delivered systems.
• Develop top-level security requirements and flow them down (SbD).
• Interact with customers to refine requirements, solutions and costs.
• Plan, execute, and track bids, proposals, and risk mitigation.

Skills

Technical leadership

Security mindset

Customer collaboration

Education

BSc in STEM

MSc in related field

14 years experience (no degree)

Tools

RMF

STRIDE

Linux Bash scripting

Python scripting

PowerShell scripting

Ansible Playbooks

Job description

Date Posted:

2026-09-11

Country:

United Kingdom

Location:

High Wycombe, Buckinghamshire

Position Role Type:

Hybrid

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.

Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

Senior Systems Security Engineer – Training Services Delivery

Location(s): High Wycombe / Northolt / Shrivenham

Summary of Role:

The Future Joint Command and Staff Trainer (FJCAST) programme will transform the delivery of senior staff training, enabling Joint Headquarters, operational commands, coalition partners and allied nations to train together across Land, Maritime, Air, Space and Cyberspace domains. Through the integration of simulation, synthetic environments, exercise design, data exploitation, operational networks and coalition interoperability, FJCAST will support the training, preparation, experimentation and evaluation of UK and allied operational headquarters.

To assist with this, we have an exciting opportunity for a Senior Systems Security Engineer to provide the functional security governance, management and support to the Delivery Team across our FJCAST programme.

This is a key role in collaboratively working with the Engineering functional delivery teams in delivering optimal training solutions and services to the Customer, to schedule at the right cost, meeting quality, safety and security standards as necessary.

Job Summary:

The Senior Systems Security Engineer is a role that requires strong systems engineering skills that will be used to develop innovative products and solutions to complex systems, including top level requirements development, requirements analysis and allocation, design, verification, integration, and production/field support. This role sits within our Training Transformation Services (TTS) Business area and reports to the TTS Delivery Lead.

We value diverse skills and experience, so don't hold back. Your qualifications and knowledge could add tremendous value to our team. Our customers come from all different backgrounds, and so do our employees. If you're passionate about what you could accomplish here, we'd love to hear from you.

Main Duties:

Responsibilities to Anticipate:

Your day-to-day activities may include:

• Performing Task Lead duties (e.g., task planning, product owner, scrum master);
• Supporting the development of a Security Risk Management Framework (RMF) following the STRIDE model;
• Create suitable Secure by Design (SbD) planning and implementation policies and procedures to ensure all delivered systems are designed, implemented and operated using a SbD approach;
• Developing top-level system security requirements, and flowing down requirements and implementation concepts (SbD);
• Be part of the team who interacts with customers to define / refine requirements, solutions, trades, costs, implementation, system impacts, and effectiveness within an agreed schedule;
• Support developing plans and estimates, task execution, project tracking, reporting, and risk identification and mitigation plans;
• Identify / produce evidence to enable the successful assessment of systems in order to achieve the Authority to Operate (ATO) and allow for through life and end of life security management;
• Involvement in security testing with a view to obtaining ATO;
• Define, implement and or assess security solutions that meet the customer’s requirements and security posture;
• Consult and assist program line management with security architectures, SbD and security risk / problem / issue management;
• Show an understanding of Attack Threat Modelling / Critical Program Information Assessments;
• Understanding of Security Impact Assessment with reference to Change Management;
• Understanding, and compliance with, MoD technology release and export licensing policies;
• Supporting the development of bids and proposals;
• An understanding of the Earned Value Management (EVM) project methodology.

Qualifications and Experience Required:

• Candidate must exhibit an exceptional degree of ingenuity, creativity and resourcefulness;
• Typically a Bachelor of Science degree (BSc) in Science, Technology, Engineering, or Mathematics (STEM) and 10 years of prior relevant experience, or a Masters Degree (MSc) in a related field and 7 years of prior relevant experience. In absence of a degree, 14 years of relevant experience is required;
• Evidence of experience in the fields of computer technology reverse engineering, or other systems security engineering fields;
• Experience generating Security and/or Cyber Security requirements, design and architecture artifacts, plans, and policies;
• Experience of Information Assurance;
• Technical leadership experience;
• Experience in Systems Engineering, including any of the following:
• System Requirements definition and analysis;
• System Test and Analysis;
• Systems Engineering Studies;
• and
• NIST Risk Management Framework (RMF) or STRIDE.
• Experience in systems security including but not limited to various computer hardware and software S/W operating system and application solutions in both a stand-alone and in LAN/WAN configurations and / or Security features and/or vulnerability analysis of various operating systems; and,
• Suitable active and transferable security clearance.

Qualifications We Value:

• Experience in design, development and implementation of secure systems;
• Accreditation / system assessment acceptance following Information Assurance Standards (IAS 1 & 2) and / or SbD;
• Understanding of obsolescence, patch & vulnerability management and change management with reference to Software, firmware, cryptography and hardware;
• Leading System Security Engineering Teams (Cyber);
• Experience in the implementation and business growth of secure systems throughout the entire life cycle of the system;
• Experience in solutions meeting robust systems security requirements;
• Program management experience with systems and security engineering;
• Broad understanding of technology;
• Royal Navy Training experience;
• Strategic planning and proposal writing skills;
• Strong interpersonal skills with the ability to interact positively with coworkers, suppliers, management, and customers in a team environment;
• Experience contributing in a team environment for the purpose of developing creative solutions to technical problems;
• A working knowledge of government IT security environments and requirements including MoD Joint Service Publications, Defence Standards and Conditions; Government Standard 7 (GovS 007: Security), safety and Integrated Logistoics Support (ILS) practices and policies;
• Recognised professional security qualifications such as CISSP, ISSAP, CISM, BCS CITP;
• Member of one or more professional bodies that are relevant to the role, such as, ISACA, ISSA UK, ISC2, CIISec;
• Grounding or qualification in systems architecture, such as MoDAF or Togaf; and,
• Experience of Linux Bash scripting, Python scripting, PowerShell scripting and/or Ansible Playbooks.

RTX adheres to the principles of equal employment. All qualified applications will be given careful consideration without regard to ethnicity, color, religion, gender, sexual orientation or identity, national origin, age, disability, protected veteran status or any other characteristic protected by law.

Privacy Policy and Terms:

Click on this link to read the Policy and Terms