Machine Learning Engineer, Risk & Fraud

About Eneba

We’re building an open, safe and sustainable marketplace for the gamers of today and tomorrow. Our marketplace supports more than 20m+ active users (and growing fast!), provides a level of trust, safety and market accessibility unparalleled to none. We’re proud of what we’ve accomplished in such a short time and look forward to sharing this journey with you. Join us as we continue to scale, diversify our portfolio, and grow with the evolving community of gamers.

About your team

We're a Data team, bringing together specialists passionate about turning data into reliable, actionable decisions across Eneba. We build the foundations—data pipelines, datasets, and platform capabilities—that make analytics and machine learning scalable and trustworthy for the whole organization.

In this role, you'll join our Risk-focused efforts and help evolve our fraud detection capabilities. The team is moving from a legacy, manual approach toward an end-to-end ML lifecycle with robust training, deployment, monitoring, and evaluation. You'll work on real-time decisioning use cases, partner closely with Risk and engineering stakeholders, and tackle the practical challenges of fraud modeling—imbalanced data, delayed/partial labels, and building strong feedback loops to continuously improve model performance.

Responsibilities

• Build and iterate on real-time fraud/risk models (e.g., gradient boosting and anomaly detection approaches) to score transactions during checkout and support Risk decisioning.
• Own the full ML lifecycle for fraud detection models: data exploration, feature engineering, training, evaluation, deployment, monitoring, and continuous improvement.
• Design robust evaluation strategies for rare-event, highly imbalanced data, including handling delayed/partial ground truth and defining metrics aligned with business constraints.
• Partner closely with Risk, backend, and Data/Platform teams to productionize models behind an API, integrate with the risk engine, and improve model-driven decision flows (pre-/post-authorization).
• Drive experimentation and feedback-loop initiatives to improve labels and model quality over time, while maintaining strong reliability, observability, and documentation.

Requirements

• 3+ years of experience as a Machine Learning Engineer (or in a similar applied ML role), ideally working with risk/fraud, anomaly detection, credit/default modeling, or other rare-event classification problems.
• Strong Python skills and hands-on experience building and iterating on supervised ML models (e.g., Gradient Boosting/LightGBM or similar), including feature engineering and model evaluation.
• Proven ability to design and run robust experimentation and evaluation under real-world constraints (imbalanced data, delayed/late-arriving labels, noisy or partial ground truth).
• Experience taking models to production and supporting the full model lifecycle (training, deployment, monitoring, and iteration) in collaboration with engineering teams.
• Solid knowledge of ML metrics and decisioning (precision/recall, thresholding, calibration, offline vs. online performance) and how they translate into business outcomes.
• Familiarity with modern MLOps tooling and practices (e.g., MLflow) and working with feature stores (Databricks Feature Store or alternatives).
• Nice to have: experience with real-time / streaming feature pipelines or infrastructure (e.g., Kafka, Flink, Feast) and building low-latency model services/APIs for real-time scoring.

Gross Salary: €55,000 - €70,000 a year

*Salary ranges may vary. We’re seeking candidates with varied experience levels; from individual contributors to functional leaders in this space.

*We’re an international team and our business language of choice is English. Good English level is required, proficiency is preferred.

What it’s like to work at Eneba

*Opportunity to join our Employee Stock Options program.

*Opportunity to help scale a unique product.

*Various bonus systems: performance-based, referral, additional paid leave, personal learning budget.

*Paid volunteering opportunities.

*Work location of your choice: office, remote, opportunity to work and travel.

*Personal and professional growth at an exponential rate supported by well-defined feedback and promotion processes.

*Please attach CV's in English.

*To find out about how we handle your personal data, make sure to check out our Candidate Privacy Notice https://www.eneba.com/candidate-privacy-notice