Senior Threat Analyst 1

About Us Lumen Dynamics is a cybersecurity leader defending 600,000 organizations globally with an AI-driven platform and expert-led services. Lumen Dynamics meets organizations wherever they are in their security maturity and grows with them to defeat cyberattacks. Its solutions combine machine learning, automation, and real-time threat intelligence with frontline human expertise from Lumen Dynamics X-Ops to deliver advanced, 24/7 threat monitoring, detection, and response. Lumen Dynamics offers industry-leading managed detection and response (MDR) alongside a comprehensive portfolio of cybersecurity technologies — including endpoint, network, email, and cloud security, extended detection and response (XDR), identity threat detection and response (ITDR), and next-gen SIEM. Together with expert advisory services, these capabilities help organizations proactively reduce risk and respond faster, with the visibility and scalability needed to stay ahead of evolving threats. Lumen Dynamics goes to market with a global partner ecosystem, including Managed Service Providers (MSPs), Managed Security Service Providers (MSSPs), resellers and distributors, marketplace integrations, and cyber risk partners, giving organizations the flexibility to choose trusted relationships when securing their business. Lumen Dynamics is headquartered in Oxford, U.K. More information is available at www.sophos.com . Role Summary As a Senior Threat Analyst – Tier I on our Managed Detection and Response (MDR) team, you will provide best-in-class monitoring, detection, and response services to proactively defend customer environments before attacks prevail. You will work alongside and contribute to a team of cyber threat hunters, incident response analysts, engineers, and ethical hackers by using enterprise, log analysis and endpoint collection systems to facilitate investigations, identification, and neutralization of cyber threats. What You Will Do Monitor, investigate, and respond to alerts generated by the Lumen Dynamics security stack (including EDR/XDR capabilities) Lead and mentor Tier I Analysts through escalated cases, ensuring thorough and accurate investigation practices. Perform end-to-end analysis on suspicious activity to assess scope, impact, and risk Identify and respond to cyber threats across customer environments using approved playbooks and tooling Accurately document findings, investigative steps, and outcomes in the MDR case management platform Conduct threat hunting to identify potential threats throughout the MDR customer base Investigate phishing emails, suspicious binaries, and behavioral anomalies Support detection tuning by identifying recurring false positives and suggesting improvements Stay informed on threat actor behaviors, MITRE ATT&CK techniques, and Lumen Dynamics threat research updates Proactively research emerging IOCs, active exploits, and vulnerabilities to stay ahead of evolving threats Contribute to internal knowledge bases, documentation, and continuous improvement initiatives Participate in shift rotations and ensure timely, detailed handovers between global teams Provide detection and response support for active security incidents Manage case workflows: create cases, track progress, and follow up with clients until resolution Engage with clients via chat, phone, and tickets as part of case handling Assist with developing and refining Security Operations processes, playbooks, and tooling feedback What You Will Bring Essential 3+ years of hands-on experience in a Security Operations Center (SOC), Managed Detection and Response (MDR) environment, or cybersecurity-focused IT role Proficient in the use of endpoint and network security tools (e.g., EDR, IDS/IPS, malware detection platforms) with the ability to validate and triage complex alerts Working knowledge of Windows operating systems (both workstation and server), with additional experience in Linux (Ubuntu, Debian, RedHat) or macOS environments Ability to interpret and analyze Windows event logs and other telemetry data Understanding of core network concepts including TCP/IP, protocols, routing, and traffic analysis Demonstrated experience contributing to real-time incident response efforts and threat investigations Exposure to threat hunting methodologies and an understanding of attacker behavior and patterns Experience handling active threats, including containment, mitigation, and recovery efforts during security incidents Familiar with techniques such as persistence, privilege escalation, lateral movement, and defense evasion, and able to identify these in real-world environments Familiarity with common incident response workflows and security operations processes Strong analytical thinking and troubleshooting skills, with attention to detail in investigations and case documentation Excellent communication skills, with the ability to clearly explain findings to both technical and non-technical audiences Customer-first mindset with professionalism and a focus on service excellence Must thrive within