Jobs Backend Developer Kotlin in Spain

Acerca del empleo ¿Te apasiona el desarrollo backend y los sistemas distribuidos de alta escala? En knowmad mood, buscamos Software Engineers Senior para participar en proyectos innovadores que impulsan la transformación digital. ¿Qué harás? Diseñar y desarrollar aplicaciones que soporten entornos distribuidos de gran volumen. Trabajar con Kotlin y Java en arquitecturas escalables. Colaborar en el rediseño y evolución de soluciones críticas para el negocio. Requisitos: ✔ Experiencia sólida en sistemas distribuidos y desarrollo backend. ✔ Dominio de Java o Kotlin (idealmente ambos). ✔ Perfil senior, con capacidad técnica y visión estratégica. �� ¿Qué te ofrecemos? Cultura human-centric: fomentamos la escucha activa con encuestas de felicidad, feedback 360º y comunicación directa con el CEO. Vacaciones y desconexión real: 22 días + 2 de libre disposición + 24 y 31 de diciembre libres. Smart working total: trabajes donde trabajes, lo importante eres tú y tus resultados. Crecimiento personalizado: plan de carrera a medida, formación técnica, habilidades, certificaciones y programa de liderazgo. Bienestar integral: promovemos la actividad física, alimentación saludable y equilibrio emocional. Team building con alma: actividades para conectar y divertirnos: escape rooms, ajedrez, videojuegos y más. Celebraciones y detalles: fiestas de verano y Navidad, y detalles especiales en cumpleaños, aniversarios o nuevas etapas. Nos comprometemos con la igualdad de oportunidades y el respeto a la diversidad. Aplicamos nuestro Plan de Igualdad y el principio de no discriminación en todos nuestros procesos de selección. ¿A qué estás esperando? ¡Join Us! No dudes en contactar con cualquiera de los compañeros de People & Talent.

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.