We’re looking for a Staff Security Engineer to define and drive Fullscript’s defensive threat detection, incident response, and AI-assisted Sec Ops capability across our cloud infrastructure, identity, endpoints, and application ecosystemsThis role sits at the technical core of our Security function. You will architect modern detection systems, leverage AI/ML to automate Sec Ops workflows, and establish defensive testing practices for AI threat vectorsPartnering with Engineering and Platform teams, you will ensure our detection and response capabilities scale with Fullscript’s fast-growing, AI-first infrastructureSet the multi-quarter technical direction for detection and response, and drive it across Security, Platform, and Engineering teamsArchitect, author, and maintain advanced detection logic across SIEM, cloud infrastructure, identity systems, endpoint protection, and AI/ML pipelinesEstablish detection coverage and defensive controls against emerging AI and agentic threat vectors (e.G., prompt injection, tool misuse, and data exfiltration patterns)Own the full rule lifecycle, from authoring and testing through tuning and retirement, and measure it against concrete signals: detection coverage, precision (false-positive rate), and time-to-detectCreate and maintain dashboards and reporting that give leadership visibility into alert volume, response times, and trends over timeDesign and deploy AI-assisted investigation workflows that leverage LLMs and automated agents to accelerate triage, context enrichment, and threat containmentBuild and extend internal security tooling to support identity resolution, cross-source log correlation, and natural-language querying over security telemetryAutomate the handoff between detection tooling and our ticketing system so investigations move from alert to resolution with minimal manual workLead and support security investigations end-to-end, from initial triage through containment and resolutionMentor Security Operations team members and set the standards the team builds against, including rule quality, detection-as-code practices, and investigation rigorPartner with relevant teams across the business to investigate and remediate security escalations surfaced from Customer Support, Customer Delivery,



and internal teamsMaintain and improve response playbooks based on lessons learned from real investigationsParticipate in an on-call rotation to respond to security incidents outside business hoursThreat model new and existing systems, including AI agents and services, to identify what could go wrong, what we would need to see to catch it, and how we would respondLead defensive testing, purple-teaming, and adversarial validation exercises to test alert fidelity and evaluate detection resilience against AI-driven threatsPartner with Platform and Engineering teams to ensure new AI services and features expose necessary logging and telemetry for effective security monitoringEvaluate authorization and access-control changes for security-relevant blast radius, and drive remediation with the engineering teams that own the affected systemsOperationalize threat intelligence into actionable detections and tracked follow-up workCoordinate indicator of compromise (IOC) blocking across endpoint, network, and web layersBenefitsReach your wellness goals with our advantages plan, discount on practitioner-grade supplements, and company-wide health and wellness programsOur dedicated DEIB Council ensures we advocate for equality and encourage positive change within ourselves and the community. We value the unique qualities and perspectives of our teamYou choose your own office with our Wherever You Work Well approach. Whether that’s in-person or at home, teams aren’t defined by geography. Output, not location, is our success metric so we also offer a flexible approach to your working hours, vacation, and personal daysWe empower each other to grow with lunch and learns, lean in circles, show-and-tells, and more. Everyone has something to learn and something to teach so we pride ourselves on growing as a teamWe’re not just a company — we’re a community. Team lunches, weekly town halls, birthdays, parties,



and clubs are an essential part of our community and cultureThe health of our people relies on the health of our planet. We are certified carbon-neutral, taking our first big step in creating a more sustainable futureThe ideal candidate has owned enterprise-scale detection engineering and incident response end-to-end. You are a pragmatic, forward-thinking engineer who excels at designing AI-augmented SOC workflows, conducting targeted AI defensive testing, and converting threat telemetry into automated, high-precision detection and response systems Working knowledge of adversary tradecraft (MITRE ATT&CK) and the ability to translate it into practical, tuned detections rather than noisy alerts Experience managing security controls as code (e.G., Terraform), with changes made through peer review rather than manual console changes8+ years of experience in detection engineering, incident response, or security engineering, with demonstrated leadership in shaping organizational security strategy Practical experience incorporating AI tooling into Sec Ops workflows, along with familiarity with detection strategies for AI-specific threat vectors Hands-on incident response experience: triage, investigation, containment, and postmortem/playbook development Experience securing cloud environments (AWS preferred) and modern Saa S/identity stacks Strong scripting/automation skills (Python, Java Script, or similar) and experience building workflows in a SOAR-style or workflow automation platform Proven ability to partner directly with engineering and infrastructure teams to define telemetry and control requirements for systems you don’t own Excellent written communication. This role regularly turns investigation findings into clear, factual updates for technical and non-technical stakeholders alike Experience contributing to or building from open detection content, such as Sigma rules or community rule repos Experience collaborating with red/purple-team exercises to validate detection coverage Experience supporting a healthcare, regulated, or otherwise highly sensitive-data environment Relevant certifications (GCIH, GCFA, GCTI, GCDA, or equivalent practical experience)#J-18808-Ljbffr

📌 Staff Security Engineer (Ai-Driven Detection & Response) (Quebec City)
🏢 Fullscript
📍 Quebec City