Senior Engineer, Machine Learning

The role

You will own the full lifecycle of ML-powered features, from research and testing to deployment and monitoring. You will build ML infrastructure for smart routing decisions and work with product, data, and engineering teams to turn use cases into outcomes.

What you will do

• Own the full lifecycle of ML-powered features from research to production monitoring
• Productionise smart routing decisions and build surrounding ML infrastructure
• Partner with product, data and engineering to ship use cases
• Apply a pragmatic mindset to experimentation and model evaluation
• Mentor other engineers on ML techniques and tradeoffs
• Talk to customers to validate ideas and test against real usage
• Help set technical direction and prioritise use cases
• Establish patterns and practices for reliable ML

Required qualifications

• Senior experience in ML engineering, data science, or applied research
• Real production deployments (API, batch, or streaming)
• Ability to design and run experiments and A/B tests
• Strong Python skills
• Hands-on experience with ML libraries such as scikit-learn, XGBoost, TensorFlow, PyTorch or Keras
• Solid grounding in modern software engineering, infrastructure and data tooling
• Understanding of MLOps challenges across the full ML lifecycle
• Familiarity with reinforcement learning
• Cloud experience
• Comfortable with ambiguity

Nice to have

• AWS preferred
• Exposure to payments or e-commerce

Benefits

• Fully remote and globally distributed
• Competitive share options
• Flexible holiday, with 25 days minimum to be taken
• Co-working space access across major cities
• Workations & Company Retreat
• The best equipment for your role
• £500 towards your home office setup
• Generous learning budget
• Private Medical Insurance
• A broad set of additional perks and benefits (depending on location)

Before you apply

• Initial intro call with a Talent Partner
• Interview with the Hiring Manager
• Challenge Stage - Contextualised to the role
• Final, values-alignment interview

About the company

Primer is the unified infrastructure for global payments. They provide finance and payments teams visibility and control to reduce complexity and improve performance.