Senior Machine Learning Engineer, AI Platform

Affinity.co is a company that leverages massive datasets to provide insights into professional relationships. They are seeking a Senior Machine Learning Engineer to collaborate with various teams to design and build AI systems that uncover insights from business interaction data, focusing on the full ML lifecycle and solving complex information retrieval problems.

Responsibilities:

• Own the full ML lifecycle: Take projects from ideation to production, including feature engineering, model selection, deployment, and model observability and evaluation
• Translate business needs into ML solutions: Gather product requirements and translate them into robust ML system design requirements
• Build recommendation and ranking systems: Architect and launch ranking and recommendation infrastructure from scratch, initially via integrated off-the-shelf models, and evolving to targeted and customized solutions in the long term
• Solve complex problems: Work on a variety of information extraction, information storage and information retrieval problems for both structured and unstructured data
• Collaborate cross-functionally: Partner with cross-functional (product, infra, data engineering, and software engineering) teams to build robust, high-scale systems that underlie all of our data processing and ML Operations

Requirements:

• 5+ years of experience in software engineering and/or Machine Learning experience in applying machine learning in production
• Hands-on experience developing ranking or recommendation systems from scratch, deployed at scale using techniques such as learn-to-rank, explainable recommendations
• Strong understanding of machine learning techniques, including clustering and decision trees
• Experience with serving ML models for streaming and batch inference at scale
• Experience with vector or graph databases
• Proficiency in Python and modern ML frameworks (PyTorch, Scikit-learn, or similar)
• Track record of building maintainable, testable, and production-grade codebases
• Experience with observability tools for online and offline model evaluation, A/B testing, and tracing for AI applications
• Experience with dataset engineering, including data curation, augmentation, and synthesis, to assist ML model improvement
• Experience with graph-based recommendation systems, such as graph NN
• Experience with packaging, CI/CD and pipeline automation