Machine Learning Engineer

sardine; United States; Remote; CAD 110,000 - 150,000; Full time

Benefits offered by this job

Generous compensation

Remote-first culture

Flexible paid time off

Health insurance

401k/RRSP matching

MacBook Pro

Home office stipend

Meal stipend

Social stipend

Learning stipend

Job summary

Sardine is hiring a Machine Learning Engineer to own real-time fraud detection systems. You will build and operate the model serving platform, orchestrate deployments, and ensure low-latency inference across signals from devices and behaviors.

You will work with Python and Go, handle drift detection, monitoring, and incident response, and contribute to self-serve tooling for engineers and data scientists.

Qualifications

• Experience building, not just using, model serving infrastructure.
• Production ownership of ML systems: paged when something broke and resolved root cause.
• Strong Python and software engineering fundamentals with CI/CD discipline.
• Comfort with Kubernetes, containers and a major cloud (GCP) and IaC.
• Understanding of models to debug data, features, or model issues.

Responsibilities

• Build and own the model serving infrastructure, real-time inference, feature retrieval, and the latency budget.
• Build the deployment path our data scientists use to ship models, including bring-your-own-model support.
• Own models in production: monitoring, drift detection, retraining, incident response, on-call rotation.
• Build and optimise pipelines turning signals into production-ready features.
• Work across Python and Go to keep inference fast in the request path.
• Develop models yourself where it makes sense, ~20% of the role, more if desired.

Skills

Python

Go

CI/CD

Kubernetes

Docker

Infra as code

Real-time inference

Model serving

Tools

Kubernetes

Docker

GCP

Job description

Who we are:

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.

Our culture:

• 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.

Location:

• Remote - United States or Canada

• 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.

About the role:

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.

What you'll be doing:

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

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

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

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

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

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

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

What you'll need

• 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.

Bonus Points

• Domain knowledge in fraud, risk, or cybersecurity.

• 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.

Benefits we offer:

• Generous compensation in cash and equity

• Early exercise for all options, including pre-vested

• Work from anywhere: Remote-first Culture

• Flexible paid time off and Year-end break

• Health insurance, dental, and vision coverage for employees and dependents - US and Canada specific

• 4% matching in 401k / RRSP - US and Canada specific

• MacBook Pro delivered to your door

• One-time stipend to set up a home office — desk, chair, screen, etc.

• Monthly meal stipend

• Monthly social meet-up stipend

• Annual health and wellness stipend

• Annual Learning stipend

Join a fast-growing company with world-class professionals from around the world. If you are seeking a meaningful career, you found the right place, and we would love to hear from you.

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