Security Engineer, Senior
Core
Founding Security Engineer establishing ARQ's security function in Brazil, covering application security, security operations, and governance/risk/compliance.
Role type
Senior IC Security Engineer (Founding)
Builds
Security infrastructure, detection rules, incident response playbooks, and vendor due diligence frameworks for a fintech app.
Domain
Fintech, Cloud Security, AI Security
Deliverable
production ML models | product features | dashboards & analysis | infrastructure
Required skills
Cloud infrastructure security (AWS, Kubernetes), Application security (threat modelling, secure code review, API testing), SIEM detection engineering, Incident response, Vendor security assessments, Endpoint security (EDR/XDR), Identity & Access Management (SSO/SCIM), AI/agentic workflow security
Preferred skills
Experience building security functions at startups, Regulated fintech/bank background
Technologies
Datadog SIEM, CrowdStrike, Cloudflare, AWS, Kubernetes, Google Workspace, Okta, Cloudflare Access
Responsibilities
Drive application security initiatives including threat modelling and secure code review; Assess and secure AI/agentic workflows; Build and improve SIEM detection rules and automated response playbooks; Conduct incident response readiness activities; Perform cloud security assessments on AWS and Kubernetes; Establish vendor security assessment processes
Seniority
Senior, hands-on IC with founding responsibilities
