---
title: 'Senior Detection Engineer | SecOps at ARQ'
canonical: 'https://feeny.ai/job/senior-detection-engineer-secops-arq-london-y4www8m08z9f'
type: 'job'
last_seen: '2026-11-06'
---

# Senior Detection Engineer | SecOps at ARQ

- **Company:** ARQ
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-10-30
- **Last confirmed live:** 2026-11-06
- **Apply:** https://jobs.ashbyhq.com/arq/3f714ba2-e37a-471f-aa20-fe86c22d65d4

## Job description

## 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, alongside 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

## About ARQ

## Company Overview
- **One-liner**: ARQ (formerly DolarApp) is a global fintech platform that provides multi-currency accounts, real-time currency conversion, and investment access to US stocks and ETFs for individuals across the Americas.
- **Entity Type**: Private (funding stage not disclosed; raised tens of millions from top-tier investors)
- **Headquarters**: Not publicly available (serves the Americas; localized sites for Argentina and Mexico)
- **Founded**: 2021
- **Founders**: Not publicly available

## Core Business
- **Primary industry**: Fintech – cross‑border banking, payments, wealth management
- **Target customers**: B2C – travelers, investors, professionals, and global citizens in Latin America and beyond
- **Mission**: “Modern finance for the global era” – to give customers control over their money with faster, cheaper, and more transparent financial rails.

## Products & Services
- **ARQ Multi‑Currency Account**: A digital account supporting USD, EUR, and local currencies (e.g., Argentine peso, Mexican peso). Users can convert between currencies at real market rates with no hidden fees.
- **ARQ Debit Card**: A Mastercard (inferred) for spending at leading conversion rates with zero commission or hidden charges.
- **ARQ Investments**: Access to US stocks and ETFs directly from the ARQ account, enabling long‑term wealth building.
- **Payment Rails**: US and European local account details to receive and send payments globally.

## Market Standing
- **Valuation**: Not publicly available
- **Key Metric (Private)**: Total funding – “tens of millions of dollars” from renowned investors; 2 million users as of 2026-07-01
- **Notable Investors**: Sequoia Capital, Founders Fund, Brevan Howard Digital, Y Combinator, Kaszek Ventures
- **Growth Signals**: Rebranded from DolarApp to ARQ in 2024 (per Sequoia partnership date); rapid user growth (2M people); expansion across the Americas; product diversification into investing.

## Competitive Advantages
- **Transparent pricing**: Real market conversion rates, no hidden fees – a stark contrast to traditional banks
- **Global accounts**: Users get US and EU bank details and a debit card usable worldwide
- **World‑class backing**: Sequoia, Founders Fund, YC, etc. provide credibility and strategic support
- **Elite team**: Small, high‑caliber team with experience at Revolut, Uber, Amazon, Block, and UBS, enabling fast execution
- **Vertical integration**: Combining payments, currency exchange, and investing in one app

## Strategic Focus
- **Build the financial system of the next century** – replace legacy banking middleware with direct, customer‑owned rails
- **Scale across the Americas** – starting in Argentina and Mexico, then expanding to other markets
- **Deepen wealth management** – add more asset classes and long‑term savings tools
- **Maintain a lean, high‑impact team** – “small teams with the best talent outcompete massive companies”

## Why Work Here
- **Culture**: “Long‑term ambition and absolute conviction”; “nimble, but ambitious” – the careers page describes a mission‑driven, execution‑focused environment
- **Team & autonomy**: Small teams own meaningful product areas; high ownership and rapid iteration
- **Remote/office**: Not explicitly stated, but likely hybrid or remote‑friendly given the global nature of the business
- **Notable**: Founders and early employees have built profitable products at iconic companies; strong emphasis on “world‑class in everything we do”
- **Perks**: Not publicly disclosed, but likely competitive compensation and equity in a high‑growth fintech

## Sources
1. [arqfinance.com](https://www.arqfinance.com/en-AR)
2. [jobs.ashbyhq.com/arq](https://jobs.ashbyhq.com/arq)
3. [sequoiacap.com/companies/arq/](https://sequoiacap.com/companies/arq/)
4. [arqfinance.com/en-AR/careers](https://www.arqfinance.com/en-AR/careers)

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