Date Posted:2026-03-01Country:United KingdomLocation:Gloucester, South GloucestershirePosition Role Type:HybridRaytheon UK has a perm opportunity for a Principal Cyber Researcher to join our Cyber Research Group (CRG).As a Principal Cyber Researcher, you will conduct cutting-edge research and development across multiple cyber domains. You’ll drive technical investigations, design rapid prototypes, and uncover emerging threats and vulnerabilities. In addition to hands-on research, you’ll be involved in day-to-day CRG operations, help shape the team’s long-term strategy, and support business development and bidding activities.You will be based at our Gloucester site, working in a hybrid capacity. Due to the interesting work you will do, you must be eligible and willing to gain SC and enhanced DV clearance.Key ResponsibilitiesConduct deep-dive research in vulnerability discovery, reverse engineering, and embedded systemsDesign and build rapid prototypes to validate novel cyber capabilities and conceptsAnalyse network protocols and system behaviours to identify security weaknessesCollaborate with multidisciplinary teams to deliver research outcomes and technical solutionsDocument methodologies, findings, and recommendations for internal and external stakeholdersManage small research teams, track progress, and report to customersContribute to CRG’s strategic planning and operational managementSupport business development efforts, including proposal writing and technical briefingsEssential Skills and ExperienceProficiency in programming languages such as C, C++, or PythonStrong working knowledge of Linux-based systems, including command-line tools and system configurationExcellent communication skills, both written and verbalSolid understanding of networking concepts and protocols (e.g. TCP/IP, UDP, DNS, HTTP, ICMP)Demonstrated analytical and problem-solving capabilities, with a methodical and inquisitive approach to technical problemsExperience in rapid prototyping using technologies such as Raspberry Pi, Arduino, and virtualised environmentsProven track record of managing research projects from concept through deliveryDesirable Skills and ExperienceHardware prototyping, PCB design and microcontroller programming.Experience using penetration testing or red team tools.Reverse engineering using Ghidra, IDA Pro, or Binary Ninja.Vulnerability research, including exploit development and mitigation bypass techniques.Embedded software development on ARM, AVR, PowerPC or MIPS platforms.Experience with Radio Frequency (RF) systems, Software Defined Radios (SDRs), 2G/4G/5G, including tools like GNU Radio, Osmocom, srsRAN or USRP.Network engineering experience in home lab or professional environments.Benefits and Work Culture37hr working week with early finish Fridays - start your weekend early!An informal, flexible working culture that is output focused25 days holiday + statutory public holidays, plus opportunity to buy and sell up to 5 days and up to 5 paid days volunteering10.5% company pension contribution with 6% employee contributionAnnual company bonus scheme (discretionary)Private Medical Insurance (grade dependent)6 times salary Life Assurance with pensionFlexible Benefits scheme with extensive salary sacrifice schemes, including Health Cashplan, Dental, and Cycle to Work, amongst othersEnhanced sick payEnhanced family friendly policies including enhanced maternity, paternity & shared parental leaveRaytheon UKYou will be based within the area of the business providing DevSecOps at scale, Artificial Intelligence, Machine Learning, cyber and geospatial intelligence capabilities to support the defence, intelligence and cyber sectors. Collaborating with customers and suppliers to deliver secure, mission critical systems using the latest technologies and innovations.We take immense pride in being a leader in defence and aerospace technology. As an employer, we are dedicated to fuelling innovation, nurturing talent, and fostering a culture of excellence.Joining our team means being part of an organisation that shapes the future of national security whilst investing in your growth and personal development. We provide a collaborative environment, abundant opportunities for professional development, and a profound sense of purpose in what we do. Together, we are not just advancing technology; we're building a community committed to safeguarding a safer and more connected world.RTX Raytheon UK is a landed company and part of the wider RTX organisation. Headquartered in Arlington, Virginia, USA, but with over 180,000 employees globally across every continent, RTX provides advanced systems and services for commercial, military and government customers worldwide and comprises three industry-leading businesses – Collins Aerospace Systems, Pratt & Whitney, and Raytheon.Supporting over 35,000 jobs across 13 UK sites, RTX is helping to drive prosperity. Each year our work contributes over £2.7bn to the UK economy and offers a wealth of opportunities to 4,000 suppliers across England, Scotland, Wales and Northern Ireland. We’re investing in all corners of the country, supporting 29,040 jobs in England, 3,040 in Northern Ireland, 1,900 in Scotland and 1,600 in Wales.#LI-AS3 C&IRTX adheres to the principles of equal employment. 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