Senior Detection Engineer | SecOps

ARQ; Greater London; Vor Ort; GBP 90.000 - 130.000; Vollzeit

Benefits dieser Stelle

Competitive salary

Stock options

Discretionary bonus

Latest tools

World-class team

Fintech app project

In-office 3-4 days a week

Zusammenfassung

ARQ is seeking a detection engineer to own end‑to‑end detection engineering in a cloud SIEM. You will onboard new log sources, write and tune detections, and ensure coverage aligns with MITRE ATT&CK.

You’ll build automation and AI agents to support rule authoring, validation and threat hunting while collaborating with the CISO and security team. You’ll apply hands-on cloud SIEM expertise, work on incidents, and help develop automated response capabilities in a fast‑paced fintech environment.

Qualifikationen

• 5+ years in security with production detections ownership.
• Hands-on cloud SIEM experience and query language proficiency.
• Deep knowledge of AWS logs (CloudTrail, IAM) and SaaS audit logs.
• Experience managing detections as code with Terraform and Git.
• Experience mapping detections to MITRE ATT&CK and testing rules.
• Python for automation and security tooling.
• Incident response experience including remediation.
• Ability to work independently in a small team.

Aufgaben

• Own detection engineering end to end in Datadog Cloud SIEM, onboard logs, build coverage.
• Write, test and tune detection rules, reduce false positives.
• Map coverage to MITRE ATT&CK and validate via attacker activity reproduction.
• Manage detections as code with version control and CI pipelines.
• Build automation and AI agents for rule authoring, validation and threat hunting.
• Investigate incidents, scope, collect evidence and write clear reports.
• Develop automated response and containment capabilities.
• Track detection coverage and communicate results to leadership.

Kenntnisse

5+ years in security

3+ years detecting in production

English communication

Tools

Datadog Cloud SIEM

Splunk

Elastic

Google SecOps

Terraform

Git

CI pipelines

Atomic Red Team

Stratus Red Team

Python

Kubernetes (EKS)

Jobbeschreibung

What we're looking for

You'll own detection engineering and help shape how ARQ detects and responds to threats. From bringing new log sources into ARQ's SIEM to writing, testing and tuning detections, you'll be responsible for making sure our coverage works when it matters.

We're looking for someone who combines hands-on detection experience with an engineering mindset. You'll work directly with our CISO and a small global security team, with the autonomy to prioritise gaps and build practical solutions. Automation is central to how we work: you'll build and run AI agents that support rule development, validation, alert triage and threat hunting, with you reviewing and approving their output.

What you'll do

• Own detection engineering end to end in Datadog Cloud SIEM: identify missing log sources, prioritise onboarding and build reliable detection coverage.

• Write, test and tune detection rules, reducing false positives while keeping meaningful threats visible.

• Map coverage to MITRE ATT&CK and validate it by reproducing attacker activity.

• Manage detections as code, using version control, CI pipelines and code review.

• Build and run automation and AI agents for rule authoring, detection validation, coverage mapping, alert triage and threat hunting.

• Investigate security incidents, including triage, scoping, evidence collection and clear incident write-ups.

• Help develop automated response and containment capabilities.

• Track and communicate detection coverage, validation results and response performance to security leadership.

What you'll need

• 5+ years in security, including 3+ years writing and owning detections in production.

• Hands-on experience with a cloud SIEM and its query language, such as Datadog Cloud SIEM, Splunk, Elastic, Google SecOps.

• Deep knowledge of AWS logs, particularly CloudTrail, IAM and IAM Identity Center, along with experience with SaaS audit logs such as Google Workspace, GitHub, GitLab or Okta.

• Experience managing detections as code using Terraform, Git, CI pipelines and code review.

• Practical experience mapping detections to MITRE ATT&CK and testing rules by reproducing attacks with tools such as Atomic Red Team or Stratus Red Team.

• Python skills for automation, log analysis and security tooling, with a record of shipping automation or AI agents that others use.

• Hands-on incident response experience, from investigating alerts to documenting findings and remediation.

• The ability to work independently, prioritise effectively and own outcomes in a small team without a dedicated SOC behind you.

• Strong written and verbal communication in English.

Nice to have

• Familiarity with CrowdStrike Falcon, Datadog SIEM, Cloudflare Zero Trust or WAF.

• Experience working with Kubernetes (EKS) audit logs.

• Threat hunting, red team or purple team experience.

• Experience building agentic workflows using Claude or OpenAI.

• A background in fintech, payments or crypto, with exposure to SOC 2 or PCI DSS.

• Spanish or Portuguese language skills.

Benefits

• Competitive salary and benefits

• Stock options, so you own part of what you build

• Discretionary performance bonus

• The latest tools and technology

• A world-class team that will challenge and grow your skills

• The opportunity to help build the best fintech app in Latin America

• Office Policy: 3-4 days a week in-office