Senior Machine Learning Engineer, Messaging Platform

This role is based in London or Stockholm with flexibility to work from home.

What you'll do:

• Design, build, and ship machine learning models that optimize messaging across push, email, and in-app channels.
• Plan and run A/B experiments in a multi-objective environment.
• Contribute to reinforcement learning systems for long-term user outcomes.
• Own the full ML lifecycle from data to deployment.

Who you are:

• Experience building and deploying machine learning models in production.
• Hands-on experience with PyTorch and distributed systems.
• Familiarity with complex optimization problems.