Senior Full-Stack Engineer (back-end heavy)

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 at 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 (we even write about many of them on our Engineering Blog https://medium.com/preply-engineering!), the kind of work that keeps you learning, stretching, and growing. We’ve reached 90%+ adoption of AI coding tools across engineering, and we’re now moving towards more autonomous, AI-Augmented development at scale. At Preply, engineers have direct access to the best tools available, with the freedom to use them fully and experiment as they build. 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, including, but not limited to: - 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; - Use a Data-driven approach: Our goal is not to deliver code but to deliver user value. Data-driven approaches and experimentation are its heartbeats. Together with the product, data, and UX teammates, the team is 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: Embody 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: This role is primarily backend-focused, with about 70-80% of the work on back-end development and 20-30% on