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Sardine

Machine Learning Engineer

Sardine Brazil

As a Machine Learning Engineer, you’ll do more than build models - you’ll design the systems that make fraud detection possible. You’ll work across modeling, data pipelines, and backend systems (Go) to ensure ML models run reliably, efficiently, and at scale.

This is a chance to combine applied ML with large-scale systems engineering, owning end-to-end solutions that tackle high-stakes, ever-evolving challenges.

What You’ll Do

  • Build and optimize data pipelines and backend services to process device and behavioral data in real time.

  • Develop and deploy ML models for fraud detection, ensuring they run reliably and efficiently in production.

  • Turn raw data into production-ready features that feed our fraud detection systems.

  • Collaborate with platform and backend engineers to integrate models seamlessly.

  • Maintain high standards of security, privacy, and compliance.

  • Champion best practices in testing, documentation, and observability.

What You Bring

  • 5+ years in software engineering, with strong backend experience (Go or Python).

  • Hands-on experience with applied ML using large datasets (PyTorch, Scikit-learn, etc.).

  • Strong SQL skills and familiarity with relational and non-relational databases.

  • Experience with end-to-end ML systems: feature pipelines, model deployment, monitoring, and iteration.

  • Excellent communication skills in English, both written and verbal.

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, Year-end break, Self care days off

  • 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

  • Unlimited access to an expert financial advisory

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