Senior Applied AI Scientist Location: London

At Preply, we are all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalized learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it is creating real impact. So far, 90,000 tutors have delivered over 20 million lessons to learners in more than 175 countries. Every Preply lesson sparks change, fuels ambition, and drives progress that matters.

As a Senior AI Scientist, you will lead the development of AI-driven personalized learning solutions and shape Preply's scientific roadmap. Working alongside exceptional scientists and engineers, you will architect state-of-the-art models and systems that enhance the experiences of millions of learners worldwide.

What you'll be doing:

• AI Research & Development: Apply deep learning, NLP, information retrieval (IR), LLMs, and multimodal AI to build and optimize scalable machine learning solutions for personalized learning and AI tutors.
• Applied Science Execution: Work on cutting-edge AI models, contributing to research, prototyping, and deployment in production environments.
• Cross-functional Collaboration: Partner with scientists, engineers, and product teams to deliver AI-driven solutions that improve learning experiences and business outcomes.
• Mentorship & Knowledge Sharing: Support and mentor junior scientists and engineers, fostering an environment of learning and innovation.
• Best Practices in ML: Contribute to machine learning best practices, including model architecture, research methodologies, and deployment pipelines.

What you need to succeed:

• PhD in NLP, IR, Machine Learning, or a related field (or equivalent experience).
• 4+ years of industry experience, focusing on deep learning-based NLP and IR applications.
• Experience with retrieval models, ranking models, LLMs and retrieval-augmented generation (RAG).
• Strong proficiency in deep learning frameworks such as PyTorch or TensorFlow.
• Hands-on experience with cloud platforms (e.g., AWS, Google Cloud).
• Ability to drive AI initiatives from research to production in a collaborative environment.
• Strong problem-solving skills and a track record of building impactful AI solutions.
• Passion for advancing AI-driven personalized learning experiences.
• Eagerness to work in a fast-paced, cross-functional setting to bring AI research into real-world applications.

Why you'll love it at Preply:

• An open, collaborative, dynamic and diverse culture.
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for your self-development.
• A competitive financial package with equity, leave allowance and health insurance.
• Access to free mental health support platforms.
• The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!).

Preply.com is committed to creating an inclusive environment where people of diverse backgrounds can thrive. We believe that the presence of different opinions and viewpoints is a key ingredient for our success as a multicultural Ed-Tech company. That means that Preply will consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status.