We’re looking for a Staff Security Engineer to define and drive Fullscript’s defensive threat detection, incident response, and AI-assisted SecOps capability across our cloud infrastructure, identity, endpoints, and application ecosystems

This role sits at the technical core of our Security function. You will architect modern detection systems, leverage AI/ML to automate SecOps workflows, and establish defensive testing practices for AI threat vectors

Partnering with Engineering and Platform teams, you will ensure our detection and response capabilities scale with Fullscript’s fast-growing, AI-first infrastructure

Set the multi-quarter technical direction for detection and response, and drive it across Security, Platform, and Engineering teams

Architect, author, and maintain advanced detection logic across SIEM, cloud infrastructure, identity systems, endpoint protection, and AI/ML pipelines

Establish 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-detect

Create and maintain dashboards and reporting that give leadership visibility into alert volume, response times, and trends over time

Design and deploy AI-assisted investigation workflows that leverage LLMs and automated agents to accelerate triage, context enrichment, and threat containment

Build and extend internal security tooling to support identity resolution, cross-source log correlation, and natural-language querying over security telemetry

Automate the handoff between detection tooling and our ticketing system so investigations move from alert to resolution with minimal manual work

Lead and support security investigations end-to-end, from initial triage through containment and resolution

Mentor Security Operations team members and set the standards the team builds against, including rule quality, detection-as-code practices, and investigation rigor

Partner with relevant teams across the business to investigate and remediate security escalations surfaced from Customer Support, Customer Delivery,



and internal teams

Maintain and improve response playbooks based on lessons learned from real investigations

Participate in an on-call rotation to respond to security incidents outside business hours

Threat model current 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 respond

Lead defensive testing, purple-teaming, and adversarial validation exercises to test alert fidelity and evaluate detection resilience against AI-driven threats

Partner with Platform and Engineering teams to ensure new AI services and features expose necessary logging and telemetry for effective security monitoring

Evaluate authorization and access-control changes for security-relevant blast radius, and drive remediation with the engineering teams that own the affected systems

Operationalize threat intelligence into actionable detections and tracked follow-up work

Coordinate indicator of compromise (IOC) blocking across endpoint, network, and web layers

Benefits

Reach your wellness goals with our benefits plan, discount on practitioner-grade supplements, and company-wide health and wellness programs

Our 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 team

You 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 days

We 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 team

We’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 culture

The 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 future

The 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 systemsWorking knowledge of adversary tradecraft (MITRE ATT&CK;) and the ability to translate it into practical, tuned detections rather than noisy alertsExperience 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 strategyPractical experience incorporating AI tooling into SecOps workflows, along with familiarity with detection strategies for AI-specific threat vectorsHands-on incident response experience: triage, investigation, containment, and postmortem/playbook developmentExperience securing cloud environments (AWS preferred) and modern SaaS/identity stacksStrong scripting/automation skills (Python, JavaScript, or similar) and experience building workflows in a SOAR-style or workflow automation platformProven ability to partner directly with engineering and infrastructure teams to define telemetry and control requirements for systems you don’t ownExcellent written communication. This role regularly turns investigation findings into clear, factual updates for technical and non-technical stakeholders alikeExperience contributing to or building from open detection content, such as Sigma rules or community rule reposExperience collaborating with red/purple-team exercises to validate detection coverageExperience supporting a healthcare, regulated, or otherwise highly sensitive-data environmentRelevant certifications (GCIH, GCFA, GCTI, GCDA, or equivalent practical experience)

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📌 Staff Security Engineer (AI-Driven Detection & Response) (Montreal)
🏢 Fullscript
📍 Montreal