Senior Threat Researcher- Threat Detection Engineer

About Us Sophos is a global leader and innovator of advanced security solutions for defeating cyberattacks The company acquired Secureworks in February 2025 bringing together two pioneers that have redefined the cybersecurity industry with their innovative native AI-optimized services technologies and products Sophos is now the largest pure-play Managed Detection and Response MDR provider supporting more than 28 000 organizations In addition to MDR and other services Sophos complete portfolio includes industry-leading endpoint network email and cloud security that interoperate and adapt to defend through the Sophos Central platform Secureworks provides the innovative market-leading Taegis XDR MDR identity threat detection and response ITDR next-gen SIEM capabilities managed risk and a comprehensive set of advisory services Sophos sells all these solutions through reseller partners Managed Service Providers MSPs and Managed Security Service Providers MSSPs worldwide defending more than 600 000 organizations worldwide from phishing ransomware data theft other every day and state-sponsored cybercrimes The solutions are powered by historical and real-time threat intelligence from Sophos X-Ops and the newly added Counter Threat Unit CTU Sophos is headquartered in Oxford U K More information is available at www sophos com Role Summary We are seeking a detail-oriented and technically skilled Detection Engineer to join our X-OPS team In this role you will be responsible for analyzing advanced security threats-ranging from malware to complex web attacks-and translating threat intelligence into high-fidelity detections across our platform Your work will help ensure our analysts and clients receive highly accurate actionable alerts with minimal noise You will leverage data from over 40 third-party and internal sources partner with our CTU Threat Intelligence team and use a range of scripting and automation tools to strengthen detection capabilities The ideal candidate is a hands-on security practitioner with a deep understanding of endpoint behavior malware analysis and detection development who thrives in fast-paced technical environments What you will do Develop countermeasures to detect advanced threats based on research and intelligence from the CTU team Analyze endpoint behaviors and logs to design detections using multi-source telemetry Continuously refine and monitor detection rules to optimize the signal-to-noise ratio for alerts Research and implement alert handling for new device ingestions ensuring high-value signal delivery Leverage internal tooling to distinguish native from standard integrations for detection accuracy Collaborate on the development of internal tools automation and detection infrastructure Act as a subject matter expert across departments including Product Management Marketing and Labs Research What you will bring Strong passion for cybersecurity research and the ability to quickly learn emerging technologies 10 yrs of relevant experience in threat research 5 yrs in detection writing Hands-on experience in scripting languages PowerShell Bash Python and use of Python data science libraries e g NumPy Pandas Matplotlib Knowledge of CI CD pipelines testing frameworks and automation principles Proficiency in analyzing logs from firewalls proxies and security infrastructure to identify anomalies Experience in malware analysis including static dynamic techniques and reverse engineering IA32 64 ARM binaries Forensic analysis of memory and disk images across various OS and file system types Familiarity with event logs traffic pattern anomalies and threat hunting methodologies Strong understanding of endpoint detection Linux Unix and Windows OS internals vulnerability identification and workflow automation Experience with event correlation and incident reconstruction using log data is a plus Network traffic analysis skills including identification of anomalous or malicious traits is a plus Solid grasp of database querying systems architecture and process automation for operational improvements is a nice to have LI-Remote B2 Ready to Join Us At Sophos we believe in the power of diverse perspectives to fuel innovation Research shows that candidates sometimes hesitate to apply if they don t check every box in a job description We challenge that notion Your unique experiences and skills might be exactly what we need to enhance our team Don t let a checklist hold you back - we encourage you to apply What s Great About Sophos Sophos operates a remote-first working model making remote work the primary option for most employees However some roles may necessitate a hybrid approach Please refer to the location details in our job postings for further information Our people - we innovate and create all of which are accompanied by a great sense of fun and team spirit Employee-led diversity and inclusion networks that build community and provide education and advocacy Annual charity and fundraising initiatives and volunteer days for employees to support local communities Global employee sustainability initiatives to reduce our environmental footprint Global fitness and trivia competitions to keep our bodies and minds sharp Global wellbeing days for employees to relax and recharge Monthly wellbeing webinars and training to support employee health and wellbeing Our Commitment To You We re proud of the diverse and inclusive environment we have at Sophos and we re committed to ensuring equality of opportunity We believe that diversity combined with excellence builds a better Sophos so we encourage applicants who can contribute to the diversity of our team All applicants will be treated in a fair and equal manner and in accordance with the law regardless of gender sex gender reassignment marital status race religion or belief color age military veteran status disability pregnancy maternity or sexual orientation We want to give you every opportunity to show us your best self so if there are any adjustments we could make to the recruitment and selection process to support you please let us know Data Protection If you choose to explore an opportunity and subsequently share your CV or other personal details with Sophos these details will be held by Sophos for 12 months in accordance with our Privacy Policy and used by our recruitment team to contact you regarding this or other relevant opportunities at Sophos If you would like Sophos to delete or update your details at any time please follow the steps set out in the Privacy Policy describing your individual rights For more information on Sophos data protection practices please consult our Privacy Policy