Principal Machine Learning Engineer
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Location: Barcelona (Remote / Hybrid - Fully Remote or 2 Days in the Office)
Salary: €135,000 Base + €15,000 Bonus (OTE €150,000)
THE COMPANY
This profitable French AdTech scale-up is transforming digital advertising through machine learning. By building AI-powered technology that determines which users are most likely to engage with an advert, they help leading mobile apps drive customer acquisition and re-engagement through highly targeted advertising.
Following approximately 60% growth over the past two years, the business has expanded to around 140 employees across offices in Paris, Barcelona, Seoul and San Francisco, with more than 25 open positions supporting continued international growth.
You’ll be joining a highly technical engineering team, working directly alongside the CTO to shape the future of machine learning across the business.
THE ROLE
As a Principal Machine Learning Engineer, you’ll define the technical direction of large-scale production machine learning systems while remaining hands-on throughout the full model lifecycle. This is an individual contributor leadership role focused on delivering complex technical projects rather than managing people.
You’ll lead end-to-end machine learning initiatives across recommendation systems, audience targeting, bidding optimisation and customer lifecycle modelling, partnering closely with senior engineering and business stakeholders to translate commercial objectives into production-ready AI solutions.
The role combines technical strategy, platform engineering and applied machine learning within a high-scale real-time environment.
YOUR SKILLS AND EXPERIENCE
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- Extensive experience building and deploying production machine learning systems at scale
- Proven technical leadership, defining architecture and technical direction while remaining hands-on