Senior Security Analyst (MDR)

Artemis is building an AI-driven defense platform and delivers managed detection and response services through Apollo. The Senior Security Analyst will lead complex investigations across cloud, identity, endpoint, and SaaS environments, make case and severity decisions, guide customers through response, conduct threat hunts, and help shape the service and platform.

Responsibilities:

• Own the investigation and the decision - Take cases from pickup to close: establish what happened, determine the impact and blast radius, set the verdict and severity, and put your reasoning on the record. You are the one who makes the call
• Investigate with real depth - Reconstruct attacker activity across identity, cloud, endpoint, and SaaS telemetry: initial access, lateral movement, persistence, and exfiltration. Pair AI-assisted investigation with hands-on log analysis, and know which one to lean on for what
• Drive response, with the customer in control - Recommend and execute containment within each customer's authorized limits, with every action impact-previewed and reversible before it runs. Where the decision belongs to the customer, bring them the recommended action, its full impact, and a clear next step
• Move at the speed the threat demands - Work by risk, acknowledge and reach a verdict inside the response targets for each severity, and keep the most consequential work moving first
• Be the security partner customers trust - You are the voice the customer hears. Your summaries, your reasoning, and your final analysis reach them in your own words
• Hunt what nothing has alerted on yet - Run hypothesis-driven and AI-assisted threat hunts across customer environments, and turn what you surface into new cases and new detections
• Help design the service, not just deliver it - Founding analysts shape what Apollo becomes: the investigative standards, the response workflows, the reporting customers receive, and the console the team works in. You will be in the room where those decisions get made, and the improvements you argue for get built
• Make the platform sharper - Your verdicts, your reasoning, and the patterns you recognize feed straight into detection engineering and product, so a problem you solve once gets engineered away rather than worked twice

Requirements:

• 4+ years of hands-on security operations experience in a SOC, MSSP, or MDR environment, at a senior or Tier 3 level where the investigation ended with your decision
• Proven investigation depth across identity (Okta, Entra ID), cloud (AWS, Azure, GCP), endpoint (EDR), and SaaS (Microsoft 365, Google Workspace)
• Fluency in attacker tactics, techniques, and procedures (MITRE ATT&CK) and how they present in real telemetry
• Rigor about evidence: you know what separates suspicious from confirmed, and exactly what you need to see to close that gap
• Hands-on experience working with AI-assisted investigation or automation, and the judgement to know where it is strong and where it needs you
• Strong customer-facing instincts. You have walked the people affected by a live security situation through what is happening and what to do about it
• Excellent written communication. What you write reaches the customer as you wrote it
• A high personal bar for the quality of your analysis, and a preference for being measured on it
• Experience in a multi-tenant MDR or MSSP practice, working across several customer environments
• Experience writing or tuning detection rules (Sigma, YARA-L, SPL, KQL, or similar)
• Incident command experience, including customer executive briefings
• Dedicated threat hunting or DFIR background
• Daily hands-on use of AI or agentic coding tools to build your own tooling