.At Preply, we are unlocking human potential through learning.We believe learning with a great tutor is life-changing. That's why we match online tutors from across the globe with learners and empower them to create live language classes with AI-powered tools and learning materials. This is how we deliver progress, create engagement and keep our global community of learners motivated. So far, over 32,000 tutors have given more than 15 million lessons to learners from over 175 countries.Meet the team!Join Preply's AI Teams and help us power people's progress through life-changing learning experiences. We're on a mission to combine the magic of the best tutors with cutting-edge AI to create personalized journeys that keep learners motivated and inspired. Together, we'll transform how students expand their vocabulary, master conversational fluency, and deepen comprehension - unlocking their full potential and sparking a lifelong love for learning. Are you ready to make an impact? Let's redefine education!What you'll be doing:Lead research projects from conception to completion, including reviewing literature, proposing initiatives, aligning with product teams, and delivering PoC/MLP solutions.Design and conduct experiments to analyze data, interpret results, and translate findings into actionable product insights.Stay current with scientific literature and emerging technologies.Contribute to strategic planning and deliver research insights to guide product decisions.Explore and assess existing API solutions, including quality and tunability evaluations.Investigate open-source tools and develop in-house generation models using Preply's infrastructure.What you need to succeed:Advanced degree in Computer Science, AI, Machine Learning, or a related field.Proven experience in leading research projects focused on NLP, LLM, GenAI (working with human speech).Experience as an ML Engineer, knowledge of MLOps principles.Familiarity with open-source and API-based solutions or interest in this field.Excellent communication skills. C1 level of English.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; Not in Barcelona? We offer an attractive relocation package to join us in our Preply Barcelona HubAccess to free mental health support platforms; Access to Gympass-partnered wellness and gym centers throughout Spain to promote and support well-being and physical health; The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!).Our PrinciplesCare to change the world - We are passionate about our work and care deeply about its impact to be life changing.We do it for learners - For both Preply and tutors, learners are why we do what we do