---
title: 'Senior Data Scientist, FinCrime at ARQ'
canonical: 'https://feeny.ai/job/senior-data-scientist-fincrime-arq-london-7xnhes61q89y'
type: 'job'
last_seen: '2026-10-16'
---

# Senior Data Scientist, FinCrime at ARQ

- **Company:** ARQ
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-12
- **Last confirmed live:** 2026-10-16
- **Apply:** https://jobs.ashbyhq.com/ARQ/bbaf8b97-e7a0-4a1d-810d-abab04f45250/application

**Skills:** Python, Machine Learning, Supervised Learning, Classification, Anomaly Detection, Fraud Prevention, Risk Modeling, Data Pipelines, Model Serving, Financial crime, AML, Payments, Backend engineering, Real-time decisioning, Risk platforms, MLOps, Model monitoring

> Build and deploy machine learning models to solve financial crime and risk challenges, including fraud detection and anomaly detection. Partner with cross-functional teams to transform business problems into scalable ML solutions and production-ready data pipelines.

## Job description

## What We're Looking For

We're looking for a Senior Data Scientist to help build the intelligence layer behind ARQ's financial products. You'll work on some of our most important risk and financial crime challenges, developing machine learning models that help us detect fraud, prevent losses, and make better decisions at scale. This is a highly impactful role where you'll take problems from idea to production — partnering with Product, Engineering, and Operations teams to turn large-scale datasets into models that directly influence customer and business outcomes. You'll join a fast-growing team helping build the future of financial services for more than 2 million customers across the Americas.

## What You'll Be Doing

- Design, build, and deploy machine learning models that solve real-world financial crime and risk challenges.
- Work on problems such as fraud detection, chargeback prediction, anomaly detection, identity verification, and transaction monitoring.
- Transform ambiguous business problems into measurable ML solutions.
- Partner closely with Product and Operations teams to define requirements, success metrics, and decision frameworks.
- Analyse large datasets to identify patterns, opportunities, and risks.
- Build and maintain production-ready data pipelines and model-serving solutions.
- Monitor model performance and continuously improve accuracy, reliability, and business impact.
- Collaborate with Data Engineering and Backend Engineering teams to operationalise machine learning at scale.
- Help shape the future of AI and machine learning capabilities across ARQ.

## What You'll Need

- 5+ years of experience across Data Science, Machine Learning, Software Engineering, or related disciplines.
- Strong Python skills and experience working with large-scale datasets.
- Proven experience developing and deploying machine learning models in production environments.
- Strong understanding of supervised learning techniques, particularly classification problems.
- Experience with anomaly detection, fraud prevention, risk modeling, or related domains.
- Ability to translate business challenges into data-driven solutions.
- Experience working cross-functionally with Product, Engineering, and business stakeholders.
- Strong communication skills and a pragmatic approach to problem-solving.
- Comfortable operating in fast-moving environments with high ownership.

## Nice To Have

- Experience in financial crime, fraud prevention, AML, risk, or payments.
- Experience in fintech, banking, or financial services.
- Backend engineering experience and familiarity with production systems.
- Experience building real-time decisioning or risk platforms.
- Familiarity with modern MLOps practices and model monitoring.

## 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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