Harnham
Senior Machine Learning Engineer
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Principal Machine Learning Engineer
Remote (UK) | Up to £110,000 Base + Bonus
If you enjoy solving difficult machine learning problems at scale and want a role where your work directly influences product and commercial decisions, this could be a great fit. You'll join a business where ML is at the core of what they do, with the freedom to shape technical direction while staying close to the engineering.
The Company
They are a profitable, AI-focused technology company that has grown significantly in recent years and operates across multiple international markets. Machine learning is central to their product, powering large-scale decision making and optimisation systems in real time.
The engineering culture is highly collaborative, with a strong focus on ownership, experimentation and continuous improvement. It's the kind of environment where technical ideas are valued and good engineers have a genuine influence on the direction of the platform.
The Role
As a Principal Machine Learning Engineer, you'll play a key role in shaping the future of the ML function while remaining hands-on with model development and platform engineering.
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You'll be responsible for:
- Setting technical direction across machine learning systems and infrastructure
- Building and optimising recommendation systems, bidding algorithms and audience targeting models
- Developing LTV, churn and attribution models used in production
- Leading work across MLOps, model monitoring, automated retraining and ML observability
- Improving ML platforms, deployment pipelines and experimentation frameworks
- Partnering with engineering and business leaders to align technical decisions with commercial goals
- Mentoring experienced engineers and contributing to architecture decisions
- Driving best practice across machine learning engineering and production systems
Your Skills & Experience
- Strong experience building and deploying machine learning models in production
- Excellent Python skills and experience with frameworks such as PyTorch or TensorFlow
- A solid background in MLOps, model lifecycle management and production ML systems
- Experience working on recommendation systems, optimisation problems or predictive modelling
- Strong software engineering fundamentals and an interest in scalable systems
- Ability to communicate technical concepts clearly to a range of stakeholders
- Experience in AdTech, programmatic advertising, DSPs or real-time bidding would be highly advantageous
- A PhD in a STEM subject would be a bonus, not a requirement
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What They Offer
- Up to £110,000 base salary
- Bonus taking total package to approximately €150,000 OTE
- Fully remote role within the UK
- 4.5 day working week with Friday afternoons off
- Longevity bonus every two years
- Flexible working culture built around trust and autonomy
- Mental health and wellbeing support
- The opportunity to shape both the technical strategy and future growth of the ML team
How to Apply
If you're looking for a Principal Machine Learning Engineer role where you can influence strategy, stay hands-on technically and work on genuinely interesting machine learning challenges at scale, please apply to find out more.
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