Senior Full-stack Engineer (frontend-heavy)

Stack

Responsibilities

• ▹Design and deliver user-facing features using React and TypeScript, owning the journey from UX to implementation, launch, and A/B validation
• ▹Develop backend features using Python/Django
• ▹Improve the codebase and workflows with practical best practices across frontend, backend, and mobile
• ▹Collaborate with Design, Product, and Data to ideate, test, and validate user-facing experiences
• ▹Dive into metrics, formulate hypotheses, analyze experiment results, and iterate quickly
• ▹Balance fast delivery with long-term stability
• ▹Set a high bar for code quality and teamwork, helping others grow through collaboration and feedback

Requirements

• ▹Full-stack expertise with a frontend focus (~70% frontend, 30% backend), strong front-end and well-rounded full-stack skills
• ▹Strong expertise in React, TypeScript, HTML5, and CSS
• ▹Exposure to backend tech: Python/Java/Node.js/Ruby/Ruby on Rails/PHP/Golang
• ▹Understanding of architectural patterns, ability to contribute to reliable, efficient services
• ▹Proactive problem-solving, facing challenges independently in codebase and product initiatives
• ▹Good communication skills, English at B2 level or higher
• ▹Ownership of quality and outcomes, thoughtful technical decisions
• ▹Deep, hands-on expertise in AI tools, especially agentic AI SDLC

Soft skills

What we offer

• ▹Open, collaborative, dynamic and diverse culture
• ▹Generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for self-development
• ▹Competitive financial package with equity, leave allowance and health insurance
• ▹Not in Barcelona? An attractive relocation package to join the Preply Barcelona Hub
• ▹Access to free mental health support platforms
• ▹Access to Gympass-partnered wellness and gym centers throughout Spain
• ▹Opportunity to shape the lives of learners and tutors in 175 countries

About the company

Preply is an ed-tech company delivering human-led, tech-enabled language learning experiences: 100,000+ tutors teach 90+ languages to learners in 180 countries. The company recently reached unicorn status with a $150M Series D and is shaping the future of education at global scale.