Trabajo Programador JavaScript en España

¡Hola! ¿Eres un/a crack del desarrollo frontend y te apasiona la Inteligencia Artificial? ¡Entonces Zemsania te está buscando! Estamos montando un equipazo para escalar activos de IA y crear productos de vanguardia en Retrieval-Augmented Generation (RAG) y Document Understanding. Si te mola estar en la onda de los Large Language Models (LLMs), agentes y el desarrollo de aplicaciones, ¡este es tu sitio! ¿Qué harás en tu día a día? Construirás interfaces frontend súper chulas y que funcionen en cualquier dispositivo usando React. Te codearás con equipos de diferentes áreas para diseñar e implementar aplicaciones y soluciones que usen IA. Jugarás con tecnologías de IA que están revolucionando el mundo, como LLMs, arquitecturas de agentes y un montón de integraciones de apps. ¿Qué necesitamos que tengas sí o sí? React y JavaScript. La experiencia con integraciones LLM (Python) es útil pero no imprescindible. Tecnologías Cloud: Openshift, Azure y AWS son las opciones ideales. El candidato debe manejar al menos alguna de estas plataformas. IA/LLM: La experiencia en IA o uso de LLM no es obligatoria para el rol de Front-End Developer pero si tiene algún tipo de experiencia relacionada es muy valorable. Idioma: Inglés obligatorio. Modalidad de Trabajo: Trabajo Remoto, pero con disponibilidad de asistir dos veces al mes a talleres en la oficina en Barcelona. ¡En Zemsania apostamos por el talento y la innovación! Si te sientes identificado/a y quieres formar parte de un proyecto que está marcando el futuro, ¡no te lo pienses más y únete a nosotros! ¡Te esperamos!

Required Qualifications 3+ years of experience as a Backend Programmer, preferably in the game industry. Proficiency in Kotlin, or solid experience with related languages such as Java, Scala, or C#. Experience designing and maintaining RESTful APIs, and working with cloud-based environments, especially AWS. Familiarity with PlayFab or similar Backend-as-a-Service platforms used in game development. Solid understanding of databases, data modeling, and backend performance optimization. Experience with user authentication, session management, and persistent game state systems. Proficient with Git and comfortable working with CI/CD pipelines for deployment and automation. Ability to write clean, maintainable, and well-documented code. Strong problem-solving and debugging skills, with an autonomous and proactive approach. Excellent communication and critical thinking skills. Fluent in Spanish (spoken and written), as our daily communication is in Spanish. Passion for games, especially RPGs and collectible mechanics. Nice to Have Previous experience working on free-to-play mobile or cross-platform games. Experience with Unity and a good understanding of client-server communication. Knowledge of networking principles, latency management, and multiplayer architectures. Familiarity with backend-driven systems for monetization, events, and player progression. Hands-on knowledge of JIRA, Confluence, and Agile workflows (Scrum/Kanban). Fluency in English (for documentation and potential cross-border collaborations). Responsibilities Design, develop, and maintain backend services for Soul Breach and other titles, ensuring scalability, security, and high performance. Build and maintain RESTful APIs to support gameplay features such as player accounts, progression, matchmaking, live events, economy systems, and analytics pipelines. Collaborate closely with client-side developers and game designers to integrate and support content-driven and live service features. Ensure data integrity, consistency, and scalability across all backend systems and internal support tools. Guarantee data privacy and secure handling of user information in line with industry best practices and compliance regulations. Set up and maintain server infrastructure, CI/CD pipelines, and cloud services. Contribute to technical decision-making, backend architecture planning, and long-term scalability strategies. Meet development deadlines and deliverables established by the production team, ensuring clear and proactive communication on progress. What We Offer Immediate start. Full-time permanent contract with flexible working hours. Hybrid or fully remote setup (within Spain). Competitive salary, adjusted to experience and scope of responsibilities. A passionate, senior, and multidisciplinary team that values creativity, autonomy, and excellence. A studio culture built on quality, collaboration, and respect for both players and developers. Ready to Join? If you are interested and would like to join our team, please send your CV and a link to your portfolio (if available) to jobs@cosmicspell.com, using the subject line: Backend Developer - [Your Name]. We look forward to discovering what you can bring to the world of Soul Breach.