Raytheon UK's Cyber Research Group (CRG) is seeking a highly skilled and analytically driven Principal Vulnerability Researcher to support advanced research and development initiatives.As Principal Vulnerability Researcher, you will conduct in-depth technical investigations across hardware and software systems to identify security vulnerabilities, develop bespoke tools, and contribute to the discovery and analysis of emerging threats. This role requires a strong technical foundation, problem-solving ability, and the capacity to work collaboratively within multidisciplinary teams.You will be based at our Gloucester site, working in a hybrid capacity. You must be eligible and willing to gain SC and enhanced DV clearance.Key ResponsibilitiesPerform hardware and software teardowns, characterisation, and reverse engineeringConduct detailed analysis of platforms to identify security weaknesses, bugs, and potential exploitsExamine network protocols and system behaviours to uncover vulnerabilitiesCollaborate with cross-functional teams to deliver innovative technical solutions and research outcomesProduce clear, structured documentation of findings, methodologies, and recommendations for both internal and external stakeholdersLead teams of researchers and report to customersAssist with business development activities and winning new workRequired ExperienceProficiency in at least one programming language (C, C++, Python)Familiarity with assembly language (reading or writing)Experience in reverse engineering using tools such as IDA Pro, Ghidra, or Binary NinjaStrong knowledge of Linux-based systems, including command-line tools and system configurationDemonstrated analytical and problem-solving skills, with a methodical and inquisitive approach to technical challengesSolid understanding of network protocolsAbility to rapidly learn and adapt to new technologies and domainsDesirable ExperienceProven track record of identifying, analysing, and reporting vulnerabilities in complex systemsExperience using or developing fuzzersPractical experience emulating hardware platforms with QEMU or similar tools to support security research and analysisEmbedded software development for platforms such as ARM Cortex, AVR, or MIPSFamiliarity with Radio Frequency (RF) systems and Software Defined Radios (SDRs), including 2G/4G/5G technologies and tools such as GNU Radio, Osmocom, srsRAN, or USRPNetwork engineering experience (professional or home lab)Hardware development and prototyping, including PCB design and microcontroller programmingBenefits 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.Joining our team means being part of an organisation that shapes the future of national security whilst investing in your growth and personal development. 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.JBRP1_UKTJ