Senior Full-stack Engineer (frontend-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

• Design and deliver user-facing features using React, and TypeScript. You’ll own the entire journey, from shaping the UX, to implementation, to launch and validation through our A/B experimentation framework.

• Develop backend features using Python/Django

• Help us improve our codebase and workflows by applying practical best practices across frontend, backend, and mobile.

• Collaborate with Design, Product, and Data to ideate, test, and validate user-facing experiences. Expect to dive into metrics, formulate hypotheses, analyze experiment results, and iterate quickly based on impact.

• Strike the right balance between fast delivery and long-term stability, helping us ship impactful features without adding complexity.

• Set a high bar for code quality and teamwork, and help others grow through collaboration, feedback, and good engineering practices.

WHAT YOU NEED TO SUCCEED

• AI Expertise: Deep, hands-on expertise in Agentic AI. Able to redesign how the team builds software across the full SDLC, not just code generation. Builds reusable AI assets that your team can adopt, and delegates reasoning-heavy work while reserving judgment for architecture, business logic, and security. You set up the AI quality gates and you challenge existing engineering workflows and propose AI-based alternatives.

• Full-Stack Expertise: This role is primarily front-end focused, with approximately 70% of the work dedicated to front-end development and 30% to back-end development, requiring solid front-end expertise and well-rounded full-stack engineering skills.

• Front-end Expertise: Strong expertise in React, Typescript, HTML5, and CSS.

• Exposure to back-end tech: Expertise in Python/Java/Node.js/Ruby/Ruby on Rails/PHP/Golang.

• Understanding Architectural Patterns: While deep backend expertise isn’t required, we do value familiarity with key architectural concepts and an ability to contribute to building reliable, efficient services that support user-facing features at scale.

• Proactive Problem-Solving: You will be expected to face and solve challenges independently, both in the codebase and in our product initiatives.

• Communication Skills: Good at working with others and communicating effectively in English at a B2 level or higher.

• Ownership: You take responsibility for the quality and outcomes of your work, not just the code. You can make thoughtful technical decisions, contribute to improving our engineering practices, and support teammates through knowledge sharing and clear, constructive feedback.

WHY YOU’LL LOVE IT AT PREPLY

• An open, collaborative, dynamic and diverse culture;

• A generous monthly allowance for lessons on Preply.com http://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;

• Access to Gympass-partnered wellness and gym centers throughout Spain to promote and support well-being and physical health;

• The opportunity to shape the lives of learners and tutors through language learning and teaching in 175 countries (and counting!).

OUR PRINCIPLES

• Care 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. Every day we focus on empowering tutors to deliver an exceptional learning experience.

• Keep perfecting - To create an outstanding customer experience, we focus on simplicity, smoothness, and enjoyment, continually perfecting it as every detail matters.

• Now is the time - In a fast-paced world, it matters how quickly we act. Now is the time to make great things happen.

• Disciplined execution - What makes us disciplined is the excellence in our execution. We set clear goals, focus on what matters, and utilize our resources efficiently.

• Dive deep - We leverage business acumen and curiosity to investigate disparities between numbers and stories, unlocking meaningful insights to guide our decisions.

• Growth mindset - We proactively seek growth opportunities and believe today's best performance becomes tomorrow's starting point. We humbly embrace feedback and learn from setbacks.

• Raise the bar - We raise our performance standards continuously, alongside each new hire and promotion. We build diverse and high-performing teams that can make a real difference.

• Challenge, disagree and commit - We value open and candid communication, even when we don’t fully agree. We speak our minds, challenge when necessary, and fully commit to decisions once made.

• One Preply - We prioritize collaboration, inclusion, and the success of our team over personal ambitions. Together, we support and celebrate each other's progress.

DIVERSITY, EQUITY, AND INCLUSION

Preply.com http://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.