Machine Learning Engineer

Sardine is the leading agentic risk platform for fighting financial crime. Our integrated solution unifies data across risk teams to help organizations stop fraud in real time, prevent AI-driven attacks, and automate fraud and AML operations. Sardine’s platform is strengthened by one of the fastest-growing fraud consortiums in the market, spanning more than 6 billion profiled devices, 800 million consumers, and 3 million businesses worldwide. Leading companies including FIS, GoDaddy, Intuit, Edward Jones, ZoomInfo, and Checkout.com rely on Sardine to secure and grow trust in their products.

• We have hubs in the Bay Area, NYC, Austin, Toronto, and São Paulo. However, we maintain a remote-first work culture. #WorkFromAnywhere

• We hire talented, self-motivated individuals with extreme ownership and high growth orientation.

• We value performance and not hours worked. We believe you shouldn't have to miss your family dinner, your kid's school play, friends get-together, or doctor's appointments for the sake of adhering to an arbitrary work schedule.

• Remote - UK, Germany, Netherlands, Ireland, Spain, Poland, Bulgaria or Lithuania

• From Home / Beach / Mountain / Cafe / Anywhere!

• We are a remote-first company with a globally distributed team. You can find your productive zone and work from there.

As a Machine Learning Engineer at Sardine, you'll own the systems that make real-time fraud detection possible. Our data science team builds custom models for our clients, you build and run the platform they deploy onto, and the low-latency serving path those models score on.
Sardine scores millions of sessions in real time from hundreds of device and behavioural signals, inside a sub-250ms budget. That constraint shapes everything: how features are computed and served, how models are deployed and rolled back, how quickly you know when something has degraded. You'll be the person who figures out why a model broke.

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  Build and own the model serving infrastructure, real-time inference, feature retrieval, and the latency budget that governs both

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  Build the deployment path our data scientists use to ship models themselves, including bring-your-own-model support for clients hosting their own

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  Own models in production: monitoring, drift detection, retraining, incident response, and the on-call rotation

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  Build and optimise the pipelines that turn raw device and behavioural signals into production-ready features

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  Work across Python and our Go backend to keep inference fast inside the request path

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  Build models yourself where it makes sense, roughly 20% of the role, and more if you want it

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  Champion testing, observability, security and compliance in a regulated environment

• Experience building, not just using, model serving infrastructure.

• Production ownership of ML systems: you've been paged when something broke, you found out why, and you changed something so it didn't happen again.

• Strong Python, and solid software engineering fundamentals, testing, code review, CI/CD, the discipline that makes a platform other people can rely on.

• Comfort with Kubernetes, containers and a major cloud (we're mostly GCP), plus infrastructure-as-code.

• Enough understanding of models to debug them. You don't need to have trained one recently, but when precision drops you should know the difference between a data problem, a feature pipeline problem, and a model problem

• Experience building tooling other engineers or data scientists actually use, and the judgement to know what should be self-serve and what shouldn't.

• Domain knowledge in fraud, risk, or cybersecurity.

• Background in Software Engineering

• Familiarity with CI/CD, Docker, Kubernetes and the modern devops framework.

• Understanding of modern browser APIs and high-entropy data collection techniques.

• Familiarity with leveraging frontier LLMs for automation.