Principal ML Engineer

Our engineering, trust and safety, and customer support teams work across offices in Rotterdam and several other countries. Traffic during holiday peaks can reach ten times normal levels, and the platform is built for it. Product reviews happen on Thursdays, with demos of whatever shipped that week.

Job summary

We're looking for a Principal ML Engineer to join our team. This is a remote role. We're looking for an engineer to build retrieval-augmented generation features on hosted and open-weight language models, with proper evaluation. You can work from home anywhere in the Netherlands. We have no office requirement. Normal business hours, Monday to Friday, with some flexibility. Most communication happens in Slack, with short video calls when needed.

What you'll be doing

• Maintain feature pipelines and a feature store such as Feast or Tecton
• Monitor models for drift, data quality issues and latency regressions
• Develop RAG pipelines with embeddings, vector stores (pgvector, Pinecone, Weaviate) and rerankers
• Build training pipelines in PyTorch or TensorFlow and run them on GPUs in AWS, GCP or Azure
• Set up evaluation harnesses and regression tests for model quality
• Write clean, tested Python and review teammates' code

Minimum qualifications

• 8+ years of software engineering experience, with at least two spent on ML systems in production
• BS or MS in computer science, engineering or a related field
• Comfortable with SQL and large-scale data processing in Spark or Ray
• Strong Python and solid engineering habits (testing, packaging, code review)
• Knowledge of LLM APIs, prompt design and evaluation methods
• Familiarity with Docker, Kubernetes and a cloud ML platform (SageMaker, Vertex AI, Azure ML)
• Hands-on experience with PyTorch, TensorFlow or JAX

Nice to have

• Computer vision background (OpenCV, detection, segmentation)
• Distributed training with DeepSpeed or FSDP

€11,000 - €13,500 monthly

Perks and benefits

• Pension scheme
• 8% holiday allowance
• Home office allowance
• Travel allowance
• 30% ruling for eligible candidates

Start: Within 30 days.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Waal Online.