Machine Learning Engineer Job Description

Key skills

Responsibilities

• • Implement production-ready model serving infrastructure with low-latency prediction endpoints
• • Build feature pipelines that serve consistent, point-in-time correct features to training and serving
• • Instrument deployed models with prediction logging, drift detection, and performance dashboards
• • Optimize model inference for throughput and latency, including quantization and batching strategies
• • Collaborate with data scientists to translate experimental notebooks into reproducible training pipelines
• • Manage model versioning, A/B deployment, shadow mode testing, and rollback procedures
• • Design and implement ML-specific CI/CD workflows including automated retraining triggers
• • Document ML system architecture, data dependencies, and operational runbooks

Requirements

• • 3+ years of machine learning engineering or closely related experience
• • Strong Python engineering skills beyond notebooks — production-quality code, testing, and packaging
• • Hands-on experience serving ML models in production with observable reliability and performance
• • Understanding of feature engineering, training pipelines, and the train-serve skew problem
• • Experience with at least one ML experiment tracking and model registry system
• • Solid software engineering fundamentals including version control, testing, and CI/CD

Nice to have

• • Experience with large language model fine-tuning, RLHF, or LLM inference optimization
• • Knowledge of hardware-aware optimization: TensorRT, ONNX, or quantization techniques
• • Familiarity with vector databases and embedding-based retrieval systems
• • Contributions to open-source ML tooling or frameworks

What to look for in a great Machine Learning Engineer

ML engineers who have operated models in production think differently from those who only experiment. Look for candidates who discuss failure modes of deployed models — what happens when the input distribution shifts, when a feature pipeline is late, or when GPU memory is exhausted under a traffic spike? Strong ML engineers apply software engineering discipline to ML systems: they test their feature pipelines, version their training data, and treat model serving as a reliability engineering challenge. The best candidates can articulate the difference between offline metrics and online performance, and have experience navigating that gap in a live product.

Interview questions to ask a Machine Learning Engineer

Ask the candidate to design a production ML system for a specific use case — for example, a personalized recommendation API. Listen for how they handle feature freshness, serving latency budgets, model versioning, and degradation detection. Ask how they would debug a situation where online model performance is materially worse than offline evaluation metrics suggested — good candidates will immediately discuss train-serve skew and data leakage. Include a software engineering question about how they would test a feature transformation function. Ask about a model they shipped that caused an unexpected production issue and how they resolved it.

Where to source Machine Learning Engineers

MLOps Community Slack and papers-with-code repositories surface practitioners who engage seriously with production ML. NeurIPS, ICML, and MLSys conference attendees and authors are strong signals for research depth. GitHub profiles showing both ML training code and serving infrastructure reveal the rare dual competency. LinkedIn searches combining specific frameworks (PyTorch, Triton) with production keywords (serving, monitoring, pipeline) help filter for the right profile. Many strong ML engineers come from software engineering backgrounds with a strong interest in applied ML — do not require a research background if production experience and engineering rigor are demonstrated.