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Security Engineer, Senior

London💼 Full-time🗓 2026-07-22 → 2026-09-25

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

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