Marlex is a leading Spanish human resources and recruitment consultancy specializing in talent acquisition, temporary staffing, and executive search. With over 30 years of experience and a network of more than 60 offices, the company serves a wide range of industries including aerospace, engineering, healthcare, and administration, positioning itself as one of the top HR firms in the country.

Headquartered in Catalonia, Marlex has a deep-rooted presence across the Spanish territory, with significant operations in Madrid and Barcelona. For international professionals, Marlex acts as a key gateway to the Spanish job market, frequently managing recruitment processes for high-tech sectors like mobility and defense that require multilingual talent and specialized technical expertise.

Founded in 1996 in Girona, Marlex began as a local recruitment firm before expanding nationwide. It has grown into one of the largest HR consultancies in Spain, focusing on proximity to both clients and candidates.

For international professionals

Operates a network of over 60 physical offices across Spain, providing extensive local market coverage.
Specializes in high-growth sectors for international talent, including Aerospace, Engineering, and IT.
Frequently manages recruitment for roles requiring multilingual capabilities, specifically English and French.
Acts as a primary recruiter for major industrial and technology hubs in Madrid, Barcelona, and Andalusia.

Full Stack Developer

Marlex Recruiting

This job was originally posted in Spanish and automatically translated to English. You'll most likely need Spanish to apply.

Job Description

Are you looking for a new job opportunity? Do you have experience developing end-to-end web applications, working in both frontend and backend? Would you like to be part of an international startup in full growth within the artificial intelligence sector? If your answer is yes, this is your opportunity!

At Paul Marlex, we are collaborating with one of the fastest-growing AI-driven productivity startups internationally, searching for a Senior Fullstack Developer to join their team in a 100% remote capacity.

What will your mission be in the company?

What will your mission be in the company?

• Design, implement, and maintain E2E functionalities.

• Build and evolve backend services and APIs, ensuring performance, scalability, and reliability.

• Develop intuitive, responsive web interfaces with a high-quality user experience.

• Integrate and work with LLM-based functionalities in production environments.

• Leverage AI-based tools and assistants to optimize development processes, automate tasks, and improve technical productivity.

• Collaborate closely with product, design, and other engineers to transform requirements into well-defined technical solutions.

• Contribute to the continuous improvement of the platform's architecture, observability, and performance.

What can we offer you?

• Stable position.

• 100% remote model.

• Be part of a fast-growing international startup within the AI sector.

• High autonomy and the ability to have a real impact on the product.

• Participation in innovative tools used by thousands of professionals.

• Senior, multicultural technical team with a growth mindset.

• Competitive compensation package + stock options.

What do we need from you?

• Demonstrable experience building fullstack web applications in production.

• Mastery of Python and Django.

• Solid experience with React or other modern frontend frameworks.

• Experience integrating, developing, or deploying LLM-based functionalities in production environments.

• Experience working with AI-based tools and assistants within the development cycle (code generation, debugging, documentation, testing, automation, or productivity improvement).

• Familiarity with AI-driven tools and environments such as ChatGPT, Claude, GitHub Copilot, Cursor, AI agents, or similar technologies applied to software development.

• Ability to work autonomously, ownership, and a continuous improvement mindset.

View original advert (Spanish)

¿Estás en búsqueda de una nueva oportunidad laboral? ¿Tienes experiencia desarrollando aplicaciones web end‑to‑end, trabajando tanto en frontend como en backend? ¿Te gustaría formar parte de una startup internacional en pleno crecimiento dentro del sector de la inteligencia artificial? Si tu respuesta ha sido sí, ¡esta es tu oportunidad!

Desde Paul Marlex estamos colaborando con una de las startups de productividad impulsada por IA con mayor crecimiento a nivel internacional, en la búsqueda de un/a Senior Fullstack Developer para incorporarse a su equipo en modalidad 100% remota.

¿Cuál será tu misión en la empresa?

¿Cuál será tu misión en la empresa?

• Diseñar, implementar y mantener funcionalidades E2E.

• Construir y evolucionar servicios backend y APIs garantizando rendimiento, escalabilidad y fiabilidad.

• Desarrollar interfaces web intuitivas, responsivas y con una experiencia de usuario de alta calidad.

• Integrar y trabajar con funcionalidades basadas en LLMs en entornos productivos.

• Aprovechar herramientas y asistentes basados en IA para optimizar procesos de desarrollo, automatizar tareas y mejorar la productividad técnica.

• Colaborar estrechamente con producto, diseño y otros ingenieros para transformar requisitos en soluciones técnicas bien definidas.

• Contribuir a la mejora continua de la arquitectura, observabilidad y rendimiento de la plataforma.

¿Qué te podemos ofrecer?

• Posición estable.

• Modelo 100% remoto.

• Formar parte de una startup internacional en rápido crecimiento dentro del sector AI.

• Alta autonomía y capacidad de impacto real en producto.

• Participación en herramientas innovadoras utilizadas por miles de profesionales.

• Equipo técnico senior, multicultural y con mentalidad de crecimiento.

• Paquete retributivo competitivo + stock options.

¿Qué necesitamos de ti?

• Experiencia demostrable construyendo aplicaciones web fullstack en producción.

• Dominio de Python y Django.

• Experiencia sólida con React u otros frameworks modernos de frontend.

• Experiencia integrando, desarrollando o desplegando funcionalidades basadas en LLMs en entornos productivos.

• Experiencia trabajando con herramientas y asistentes basados en IA dentro del ciclo de desarrollo (generación de código, debugging, documentación, testing, automatización o mejora de productividad).