Senior Machine Learning Engineer

MoonPay Madrid, Community of Madrid, Spain Senior Machine Learning Engineer MoonPay Madrid, Community of Madrid, Spain 4 days ago Be among the first 25 applicants Get AI-powered advice on this job and more exclusive features. Hi, we’re MoonPay. We’re here to onboard the world to the decentralized economy. Why? Because crypto and blockchain aren’t just technologies—they’re tools for global financial empowerment. They give people control over their money, their digital assets, and their future, unlocking opportunities that traditional systems have kept out of reach. What We Do At MoonPay, we’re building the infrastructure that powers this new financial system. We make it easy for anyone, anywhere, to buy, sell, and trade crypto using everyday payment methods like cards, Apple Pay, PayPal, Revolut and Venmo. We provide simple tools to send, receive, and manage stablecoins, so anyone can participate in the crypto economy confidently. Trusted by nearly 30 million customers and over 500 companies, our secure, enterprise-grade platform is driving mainstream crypto adoption worldwide. We collaborate with innovative brands and projects to build secure, scalable solutions for a blockchain-powered future. And we’re committed to doing it right—fully licensed in the U.S. and regulated across the UK, EU, Canada, and Australia—because trust and compliance are non-negotiable. But we’re just getting started. We’ve launched a consumer app that makes crypto accessible, intuitive, and usable for everyone, and it’s growing fast. We’re iterating every day to make it the best it can be. If you believe financial freedom should be for everyone—if you believe in building a fairer, more open financial system—we want you with us. To build systems that benefit all, we need contributions from all, regardless of background. Come build the future of payments and the decentralized economy with MoonPay. Let’s make financial freedom and autonomy the new normal. Locations Supported About the Opportunity Our engineering discipline builds the technology that enables MoonPay to learn quickly and scale easily. We organize in small cross-functional squads of 4-6 engineers and an embedded Product Manager and Product Data Analyst. We currently have squads across Crypto / NFT / Payments / FinCrime / KYC / Core Product and others. For this role, the initial focus will be on working on our FinCrime products, while mastering other product areas to then spearhead ML and AI adoption in the company. What you will do Build and integrate ML solutions for evaluating transactions and customers’ behaviour in real-time and offline environments Support multiple Crypto products with tailored ML solutions to prevent fraudulent activities Experiment with various modeling techniques on our customer data and see your solution through to production by partnering cross-functionally with product, data, operations, and engineering teams Analyze large datasets using SQL, Python and Apache Beam to surface features Help build AI-powered automation tools or pipelines and propose improvements across the company Own the full lifecycle of ML solutions: data ingestion / processing → feature engineering → model development → deployment → iteration Maintain and improve our existing codebase, expanding our internal ML libraries and pipelines What you will be working with Python ML feature engineering for fraud prevention Gradient boosting algorithms (e.g. XGBoost/CatBoost) PyTorch Polars, Pandas and Numpy BigQuery Apache Beam BigTable FastAPI Docker and Kubernetes Kubeflow and Airflow Vertex AI Redis Pydantic DataDog Github About You Experienced in Machine Learning at leading Fintech startups or fast growing tech companies Confident in developing, releasing and maintaining ML models in a fast paced, iterative environment Experienced with some of our tech stack, or are confident you can cross train and up skill quickly Real world experience working with time series data for classification, counterfactual reasoning and adversarial models Understand data structures, pipelines and big data processing for real-time consumption Experienced with Cloud Native applications such as Google Cloud or similar e.g. AWS, Azure We’re looking for people who live our core values, those who strive for excellence and want to leave a lasting legacy on the global financial system. Our values: B - Be Hungry L - Level Up O - Own It C - Crypto Curious K - Kaizen What’s in it for you Competitive salary package