Location:Hybrid – Downtown Toronto (4 days/week in office)Type:Full time | PermanentCompensation:$160–200K CAD base + meaningful early-stage equityWe’re partnering with a fast-growing AI SaaS startup building a next-generation developer platform for engineers in a highly technical, regulated domain. The product delivers step-function productivity gains through AI-native workflows and deep integration with high-performance systems.They’re hiring a Senior Security Engineer to build and scale the security function from the ground up. The platform handles extremely sensitive data across product, models, and cloud infrastructure, so security is core to the business, not an afterthought.This role sits at the center of trust and ownership, with responsibility across cloud, product, compliance, and operations, helping ensure the company meets enterprise-grade expectations as it scales (including SOC 2).What You’ll DoDesign, implement, and maintain security controls across AWS and KubernetesOwn cloud security fundamentals including IAM, network security, and secrets managementLead security architecture reviews for new services and infrastructure changesBuild and operationalize incident response playbooks and runbooksLead investigations, containment,



and post-incident reviewsBuild detection and monitoring across infrastructure and applicationsImplement security guardrails across CI/CD, infrastructure-as-code, and cloud environmentsPartner closely with engineering and leadership to raise the security bar without slowing velocityWhat We’re Looking For4+ years of hands-on security engineering experienceStrong cloud security architecture background (AWS preferred)Solid Kubernetes and identity/security fundamentals (IAM)Experience leading incident investigations and building detection capabilitiesExperience building security tooling and guardrails for engineering teamsStrong communication skills and ability to influence across product and engineeringBonus PointsExperience with SOC 2, ISO 27001, or similar frameworksStartup experience (high ownership, fast pace, build-from-zero mindset)Proficiency in Python, Go, Java, or TypeScriptExperience with corporate security (endpoint protection, SSO/MFA, identity management)Why Join?Greenfield opportunity to build the security function at a high-growth startupWork at the intersection of AI, cloud infrastructure, and complex engineering systemsStrong compensation and meaningful equityHigh-caliber team, high autonomy, direct impact#J-18808-Ljbffr

📌 Senior Security Engineer - C$160,000 - C$200,000 A Year (Toronto)
🏢 Arcadia
📍 Toronto