Senior Machine Learning Engineer

We are seeking a Senior Machine Learning Engineer to join Rent.app, a fintech platform enabling deferred and split rental payments for the US market.

Rent.app is backed by leading VC funds, with a founding team boasting experience at Cash App, Dropbox, Square, and Apple.

You will

• Design, build, and operate production ML systems that support critical product and risk decisions.

You will work closely with engineering, data, product, and risk teams to develop models and infrastructure that directly impact approval rates, losses, and customer outcomes.

This is a hands-on role focused on applied machine learning, strong software engineering, and reliable ML operations in a regulated fintech environment.

Responsibilities

• Design and deploy machine learning models for underwriting, fraud detection, and risk assessment.
• Build and maintain training pipelines, feature engineering workflows, and model serving infrastructure.
• Integrate ML models into backend services and data pipelines with a focus on reliability and scalability.
• Monitor model performance, data quality, and drift in production; iterate based on results.
• Partner with product, engineering, and risk stakeholders to define success metrics and model requirements.
• Contribute to ML engineering best practices, code reviews, and technical standards.

Requirements

• 5+ years of experience in machine learning engineering or applied data science.
• Proven experience deploying and operating ML models in production environments.
• Strong Python skills and experience with common ML frameworks (scikit-learn, PyTorch, or TensorFlow).
• Solid software engineering fundamentals and experience building APIs and data pipelines.
• Familiarity with cloud infrastructure, containerization, and CI/CD workflows.

Bonus qualifications

• Experience in fintech, credit, payments, or fraud modeling.
• Familiarity with MLOps tooling and model monitoring frameworks.
• Experience with large-scale structured data and experimentation.

We offer

* Up to €180k/year salary + equity. * Official employment, relocation help (Lisbon), insurance, corp. laptop, etc.