Senior Machine Learning Engineer

The Senior Machine Learning Engineer plays a key role in advancing Protolabs' intelligent pricing platform by building, maintaining, and improving machine learning models that power real-time quoting for custom-manufactured parts. Working within a complex two-sided marketplace, this role focuses on modelling demand and supply dynamics to enhance pricing accuracy and automation, enabling scalable, data-driven decisions even before manufacturing cost inputs are available. The position partners closely with engineering, data, and product teams to deliver innovative solutions that improve pricing performance and support overall business growth. What you'll do:

• Develop, improve, and maintain machine learning models that capture demand and supply dynamics in a digital manufacturing marketplace
• Build and refine pricing-related models, including cost estimation from CAD geometry, demand forecasting, and partner routing probability models
• Apply a range of ML techniques such as tree-based methods, probabilistic models, and deep learning to solve both new and existing challenges
• Design, build, and maintain reliable training and inference pipelines on AWS.Run offline experiments, including A/B testing and backtesting, to validate model improvements before deployment
• Collaborate closely with ML engineers, data scientists, and domain experts in a cross-functional team.Translate complex marketplace inputs like part geometry, order history, and partner capacity into meaningful features for models
• Monitor model performance in production and proactively identify and address drift or degradation
• Stay up to date with advancements in machine learning, especially in pricing, marketplace modelling, and manufacturing intelligence
• Mentor and support mid-level and junior engineers within the team

• Proven experience building and deploying machine learning models in production environments
• Strong coding skills in Python (or similar), with experience using ML frameworks such as PyTorch, TensorFlow, or scikit-learn
• Solid understanding of supervised and probabilistic modelling, including regression, classification, and uncertainty estimation
• Experience with feature engineering from structured and/or geometric data
• Hands-on experience with ML pipelines, model versioning, experiment tracking, and MLOps tools (e.g. Weights & Biases, Prefect, Karpenter)
• Comfortable working with real-world, messy data and solving ambiguous problems

Nice to have

• Experience with marketplace or pricing models (e.g. demand modelling, price elasticity, cost estimation)
• Background in operations research, econometrics, or supply chain optimisationExperience working with 3D or geometric data (e.g. CAD, point clouds, mesh processing)
• Experience designing and scaling ML infrastructure for production systems
• Strong communication skills with the ability to explain complex models to non-technical stakeholders
• Experience with ML monitoring, alerting, and retraining workflows

Why Protolabs? We are the leaders in digital manufacturing. We hire doers, makers, and creative thinkers who tackle our roles with an entrepreneurial spirit. Our culture is centered around meaningful work that brings new and innovative products to market at unprecedented speeds. We are a diverse team that comes from all walks of life and take pride in our team who is smart, genuine, humble, and passionate about what we do. It's our people who fuel our creativity and make our culture feel like home., * Part of our incredible journey is clearly down to our amazing team, and we strongly believe in giving people a space to truly, authentically be themselves. We also believe that treating our employees well and sprinkling a great place to work with some nice perks can make work a little sweeter. * Annual company bonus. We celebrate success together! Employees are not only rewarded for their achievements but also for contributing to the overall success of the business. * Wellness and well-being with access to OpenUp psychologists, practice mindfulness with Headspace and tons more. * Doggo-friendly office. We are big pet lovers and fully encourage hanging out with your (and your colleagues') furry friends in the office * Daily Lunch and snacks are provided in the office; it's a moment for our teams to connect and recharge. Shared meals strengthen our bonds and fuel collaboration. * We offer learning and development days to be used for training or on volunteering, money to spend on learning courses, events, trainings, Access to our in-house LEARN platform with diverse courses, training, and workshops, In-house 3D Printing and much more! * Follow us on Instagram to see what Life at Protolabs is all about! E learning E learning in Amsterdam