Marcus Adeyemi
Machine Learning Engineer · Chicago, IL · marcus.adeyemi@example.com · linkedin.com/in/marcusadeyemi
Summary
Machine learning engineer with 5 years taking models from training pipeline to monitored production. Built real-time fraud scoring at 12M transactions/day, feature-store migrations, and drift-monitored retraining. Strong Python, PyTorch, and gradient-boosted models on tabular data; experienced with AWS (SageMaker, S3), MLflow, and Airflow.
Professional Experience
Machine Learning Engineer · Bramble Pay
Jun 2023 – Present
- Cut chargebacks 23% (~$3.1M/yr) by deploying a real-time fraud model (gradient-boosted ensemble, XGBoost) scoring 12M transactions/day at p99 under 40ms on SageMaker endpoints.
- Held fraud precision within 2 points of launch for 14 months by building drift-monitored retraining: feature and prediction drift alerts feeding weekly automated retrains, gated by offline metrics and a shadow-deployment check.
- Eliminated training–serving skew incidents (previously ~2/quarter) by migrating 240 features to a Feast feature store with point-in-time-correct backfills, now shared by 3 model teams.
- Halved model iteration time (11 days to 5) by standardizing experiment tracking on MLflow and moving ad-hoc training scripts into versioned SageMaker Pipelines with automated evaluation reports.
Machine Learning Engineer · Kestrel Logistics
Jul 2021 – May 2023
- Reduced stockouts 17% across 1,200 SKUs by shipping demand-forecast models (LightGBM with engineered seasonality and promotion features), replacing a manual spreadsheet process.
- Cut nightly batch-scoring cost 60% by moving inference from an always-on cluster to spot-instance Spark jobs with checkpointed retries.
- Improved delivery-ETA error (MAE) 22% by rebuilding the feature pipeline in Airflow with data-quality checks that caught upstream schema breaks before they reached training.
- Won the model rollout decision with evidence, not opinion, by running a 4-week A/B evaluation against the incumbent heuristic (2.4% revenue lift, p < 0.01).
Projects
Open-source: skewguard
- Built and maintain a training–serving skew detection library (feature distribution and null-rate diffs between offline and online paths) with 400+ stars, used in production at 2 companies.
Technical Skills
- Machine Learning: Python, PyTorch, gradient-boosted trees (XGBoost, LightGBM), scikit-learn, feature engineering, model evaluation (offline metrics, A/B testing)
- MLOps & Infrastructure: AWS (SageMaker, S3, Lambda), MLflow, Airflow, feature stores (Feast), drift monitoring, Spark, Docker, Kubernetes, CI/CD
Certifications & Education
- B.S. Statistics, University of Illinois Urbana-Champaign — May 2021
- AWS Certified Machine Learning – Specialty — Mar 2024