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
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
