Senior II Full-Stack Engineer (back-end heavy)
Employment Type: Full time
Location Type: Hybrid
Department: Engineering
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.
We’ve reached 90%+ adoption of AI coding tools across engineering, and we’re now moving towards more autonomous, AI‑Augmented development at scale. You will work in a cross‑functional team alongside Product Managers, Product Designers, UX Writers, Data Analysts, Engineering Managers, Engineers, and other stakeholders to deliver meaningful outcomes for learners and tutors as a Senior II Full Stack Engineer. Back-end Development: Design, build, and evolve scalable backend systems using Python/Django, driving architectural decisions, creating new services, and owning critical integrations that support Preply’s growth;
Develop and evolve frontend experiences in React/Typescript,



contributing to experimentation frameworks and helping establish frontend engineering best practices;
Implementation & Ownership: Lead complex initiatives from discovery through deployment, taking ownership of solutions throughout their lifecycle and balancing immediate product needs with long‑term sustainability;
Raising the Bar: Drive engineering excellence through mentorship, architectural reviews, and the adoption of best practices across frontend and backend development;
Data‑Driven Product Development: Partner closely with Product, Data, and UX teammates to identify opportunities, validate hypotheses, and maximize customer value through experimentation and measurable outcomes;
Influence technical direction beyond your immediate scope, collaborating with engineers, managers, and stakeholders to drive alignment and successful delivery;
Continuously raise the quality bar through craftsmanship, curiosity, continuous learning, and a commitment to helping others grow.
Full-Stack Expertise: This is a backend‑heavy full‑stack role, with approximately 85% of the work focused on backend development and 15% on frontend development.



You bring deep backend engineering expertise alongside the ability to contribute across the full stack and deliver end‑to‑end solutions;
Experience designing and evolving large‑scale web applications, including well‑designed APIs, distributed systems, high‑volume data flows, and scalable architectural patterns. Ability to make sound technical trade‑offs that balance short‑term delivery with long‑term sustainability;
Demonstrated ability to influence technical decisions, drive engineering best practices, and contribute to architectural direction within and beyond your immediate team;
Product & Business Impact: Strong product mindset with the ability to translate ambiguous business challenges into scalable technical solutions, using experimentation, data, and customer insights to guide decisions;
Excellent collaboration, stakeholder management, and communication skills, with the ability to work effectively across engineering, product, design, and data functions. English level B2 or higher;
Understanding of observability, reliability, monitoring, and operational best practices, with willingness to participate in your squad’s on‑call rotation (1 week every 5 weeks);
Why you’ll love it at Preply

com, Learning & Development budget and time off for your self‑development;
A competitive financial package with equity, leave allowance and health insurance;
We offer an attractive relocation package to join us in our Preply Barcelona Hub;
We believe that the presence of different opinions and viewpoints is a key ingredient for our success as a multicultural Ed‑Tech company.

📌 Senior Backend Developer / Full Stack / Frontend Developers (Barcelona)
🏢 Preply
📍 Barcelona