Alexander F.

✅ EXPERT-VETTED 🎖 TOP RATED PLUS Top 1% of global talent on Upwork Senior Machine Learning & Data Engineer with 9+ years of experience in Machine Learning, Data Science, AI, and Data Engineering. Former Yandex Engineer and Head of R&D at a digital pathology startup. I build production Machine Learning and AI systems in Python — from computer vision and NLP to predictive modeling, document AI, and large-scale data products. My background combines hands-on ML engineering, data science, and the data infrastructure needed to run these systems reliably in production. $200K+ earned on Upwork • 2,800+ hours • 50+ engagements • 100% Job Success I work best on projects that need a senior hands-on engineer who can quickly understand the business problem, design a practical technical solution, and build it. Machine Learning & Data Science ● Classification, regression, ranking, and predictive modeling ● PyTorch, TensorFlow, scikit-learn, Hugging Face ● Model development, evaluation, optimization, and production integration ● Applied ML for real business and product problems Computer Vision & Medical Imaging ● Object detection and tracking ● Image classification ● Instance and semantic segmentation ● Whole-slide imaging / digital pathology ● OpenCV, Detectron2, U-Net, Mask R-CNN, HoverNet NLP, Document AI & Knowledge Systems ● Text classification and sentiment analysis ● Named Entity Recognition and information extraction ● OCR and document-layout processing ● Knowledge graphs, vector search, and semantic retrieval ● Processing large scientific and legal document collections Data Engineering & Big Data ● ETL / ELT and production data pipelines ● Batch and streaming data processing ● Apache Spark, Kafka, ClickHouse, PostgreSQL, Redis ● Data modeling, data quality, analytics pipelines, and performance optimization ● Large-scale event and behavioral data systems Backend & Production Systems ● Python, FastAPI ● PostgreSQL, ClickHouse, ArangoDB, Qdrant ● Docker and cloud-based deployments ● APIs and data/ML services My background includes: ● Yandex — large-scale ML/data systems, geospatial analytics, mobile/GPS event processing, batch and streaming pipelines ● Head of R&D, Digital Pathology — led development of computer vision systems for medical imaging ● AdTech / CDP — identity graphs, audience systems, high-volume event pipelines ● 50+ international consulting engagements across healthcare, AdTech, LegalTech, scientific data, geospatial analytics, NLP, computer vision, and data engineering I can join an existing engineering team, take ownership of a specific ML/data system, or help turn an early technical idea into a working MVP and production architecture. Client feedback: “Alexander was excellent. He managed expectations well and overperformed on the work. Communications were excellent. He saved us 100s of hours of work by automating our processes. He’s more expensive than many people on Upwork, but appears to be exceptionally good and reliable.”