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# Security Engineer, Senior

- **Company:** DolarApp
- **Location:** Greater London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Amazon Web Services, Software as a Service, Cloud Computing Security, Cyber Security, Continuous Integration, Identity and Access Management, Intrusion Detection and Prevention, Secure Coding, Security Information and Event Management, Datadog, Okta, Large Language Models, Software Security, Falcon Platform, Kubernetes, Cloudflare, Gsuite, Api Management
- **Published:** September 10, 2026
- **Apply:** https://www.collegerecruiter.com/job/2840602229-security-engineer-senior

## About the Role

* 4-7 years in information security, ideally having built or significantly shaped the security function at a startup or high-growth company - you've been the person who sets things up, not just maintains them
 * 2+ years at a regulated fintech/bank/payment company
 * Hands-on experience with cloud infrastructure security (AWS, Kubernetes)
 * Familiarity with application security practices: threat modelling, secure code review, CI/CD pipeline hardening, and API security testing
 * Ability to assess and secure emerging AI/agentic tooling - you understand the risks of LLM integrations, MCP servers, and automated workflows, and can define practical guardrails
 * Working knowledge of SIEM platforms and detection engineering - you've written detection rules
 * Experience with endpoint security tooling (EDR/XDR) and identity & access management in a SaaS-heavy environment (Google Workspace, Okta/Cloudflare Access, SSO/SCIM)
 * Experience running or contributing to vendor security assessments and third-party due diligence
 * Strong written and verbal communication in English

## Description

You'll be ARQ's first Security Engineer based in Brazil - it's the chance to lay the foundation for how we do security in the region and shape how that function grows from here. You'll work closely with our global security team but have real autonomy in deciding what "good" looks like locally, from day one., * Drive application security initiatives: threat modelling, secure code review support, API testing, and security pipeline improvements

 * Assess and secure AI/agentic workflows across the company - reviewing prompts, preventing destructive actions, and controlling data exposure
 * Build and improve SIEM detection rules, alert pipelines, and automated response playbooks (Datadog SIEM, CrowdStrike, Cloudflare)
 * Contribute to incident response readiness, including IR playbooks, tabletop exercises, and forensic procedures
 * Conduct cloud security assessments across AWS and Kubernetes environments
 * Establish and run the vendor security assessment process - building a scalable due diligence framework for third-party onboarding


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