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Senior Machine Learning Engineer

PrimerUnited KingdomEngineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Posted
24 Sept 2026
Status
Open · checked 7d ago

About this role

Role Overview

The Senior Machine Learning Engineer role at Primer is a remote position based in the United Kingdom, offering the opportunity to act as the first senior engineer in machine learning. This role suits an experienced professional who is eager to build the machine learning function from the ground up alongside a staff engineer and shape the future of global payment infrastructure.

Key Responsibilities

Own the entire lifecycle of machine learning features, spanning independent research, testing, training, deployment, and production monitoring.
Productionize smart routing decisions for payment flows and build supporting machine learning infrastructure including versioning, CI/CD, and observability.
Collaborate closely with product, data, and engineering teams to transform promising use cases into shipped, measurable outcomes.
Apply a pragmatic, impact-driven mindset to experimentation and model evaluation instead of prioritizing overly sophisticated methods.
Mentor fellow engineers on machine learning techniques, sharing trade-off evaluations and keeping solutions straightforward.
Engage directly with customers to validate concepts and test solutions against real-world usage.
Establish repeatable standards and practices that make machine learning reliable across the organization.

Requirements

Senior-level background in machine learning engineering, data science, or applied research, backed by real production deployments across API, batch, or streaming.
Strong statistical mindset with the ability to design, run, and interpret A/B tests and experiments.
Proficient in Python alongside practical experience with tools such as scikit-learn, XGBoost, TensorFlow, PyTorch, or Keras.
Solid understanding of modern software engineering, data tooling, infrastructure, and full lifecycle MLOps challenges.
Familiarity with reinforcement learning concepts like contextual or multi-armed bandits and their practical applications.
Cloud computing experience, with AWS preferred, though GCP or Azure are also accepted.
Comfortable navigating ambiguity and working independently to research, develop, and productionize initiatives.

Skills and Tools

Python
PyTorch
TensorFlow
AWS, GCP, or Azure
MLOps tools and infrastructure
Scikit-learn and XGBoost

Salary and Benefits

Fully remote work environment with global distribution since day one
Competitive share options
Uncapped holiday policy with a mandatory minimum of 25 days taken annually
Access to co-working spaces in major cities
Company retreats and workations
Premium equipment provided for the job
£500 home office setup allowance
Generous learning and development budget
Private Medical Insurance
Additional localized perks and benefits

About the Company

Primer provides the unified infrastructure for global payments, supplying finance and payments teams with visibility and control to decrease complexity, boost performance, and secure more revenue from a single platform. Backed by prominent investors including Sofina, Peak XV Partners, ICONIQ, Tencent, Accel, and Balderton, the organization builds the payment layer relied upon by top global companies.

How to Apply

Interested candidates should apply directly on the official company careers page to begin the interview process, which includes an initial intro call, a hiring manager interview, a contextual challenge stage, and a final values-alignment discussion.

Skills and tech stack

PythonPyTorchTensorFlowAWSGCPAzureMLOpsReinforcement Learning

Questions candidates ask

Is this position fully remote?

Yes, this role is remote-first, allowing you to work from the United Kingdom.

What cloud platforms are required?

AWS is preferred, but experience with GCP or Azure is also acceptable.

Do I need prior experience in the payments industry?

No, payment or e-commerce experience is considered a plus rather than a strict requirement.

What benefits are included with the role?

Benefits include competitive share options, uncapped holiday with a 25-day minimum, a £500 home office allowance, private medical insurance, and a learning budget.

How can I apply for this position?

You can apply directly on the official company careers page.

Ready to apply?

The application is on the official Primer careers page.

Apply on company site