Full-Stack Engineer

We power people's progress. At Preply, we're all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it's creating real impact. We've just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we're only getting started. As a category-defining company, we're shaping what the future of learning looks like on a global scale. Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day. Meet the Team Our team builds scalable, resilient products using Python/Django on the backend and React on the frontend, all with one goal in mind: creating a smooth, meaningful experience for our learners and tutors. We're proudly tech-agnostic. Great engineers come from all kinds of backgrounds. Whether you've worked with Java/Spring, Node.js, Ruby on Rails, Scala/Play, PHP, or Go, you'll feel right at home here. Python experience isn't required. We make decisions based on data and real user feedback: running A/B tests, shipping iteratively, and constantly improving. We also put a strong focus on observability, monitoring, and metrics so we can keep our systems healthy and continue optimizing at scale. At Preply, we ship 50-60 times per day, thanks to a solid CI/CD setup and a culture that values action over ceremony. As a fast-growing company, you'll find a wide range of technical challenges that keep you learning, stretching, and growing. What You'll Be Doing You will work in a cross-functional team alongside the Product Manager, Product Designer, UX Writers, Data Analytics, Technical Leads, Engineers and other cross-functional team members to deliver engaging features through A/B tests and build top-notch products. - Back-end Development:Develop and own backend features using Python/Django, supporting the creation of new backend services and designing, creating, and troubleshooting integrations with third-party vendors. - UI Development:Develop frontend features in React/Typescript, launched in our A/B experimentation framework. - Implementation:Take on the responsibility of writing services from initial concept to full-fledged deployment. - Raising the bar of our end-to-end solutions:Leverage previous experience to implement and socialize current best practices in frontend and backend. - Data-driven approach:Together with the product, data, and UX teammates, we are responsible for value delivery, analysis, ideation, and focus. - System Design:Design efficient system architectures that align with team goals, constraints and schedules. - Prioritisation:Strike a balance between delivering fast results and maintaining high-quality, sustainable systems. - Chasing Excellence:Embodies a mindset of mastery by continuously seeking to improve your craft, delivering work of exceptional quality, and inspiring those around you to aim higher. What You Need To Succeed - Full-Stack Expertise:Primarily backend-focused (70-80% backend, 20-30% front-end) requiring solid backend expertise and well-rounded full-stack engineering skills. - Exposure to front-end tech:Good understanding of React, Typescript, HTML5, and CSS. - Exposure to architectural patterns of a large, high-scale web application (e.g., well-designed APIs, high-volume data pipelines, efficient algorithms). - Proactive Problem-Solving:Face and solve challenges independently, both in the codebase and in product initiatives. - High level of self-organization, ownership, and responsibility. - Communication Skills:Good at working with others and

communicating effectively in English at a B2 level or higher. - A great collaborator with excellent verbal and written communication skills. Minimum B2 English level. - Willingness to be on-call for your squad (1 week every 5 weeks). 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 Hub. - Access to free mental health support platforms.