Job Summary: We are looking for a Backend Developer with experience in NodeJS and databases, capable of building and maintaining scalable, integrated applications while collaborating within multidisciplinary teams. Key Highlights: 1. Backend Development with NodeJS and REST/GraphQL APIs 2. PostgreSQL Database Management and Optimization 3. Multidisciplinary Collaboration and Continuous Improvement We are knowmad mood! We are a leading digital transformation company, constantly evolving and at the forefront of technology. We were founded to drive real change through innovation and sustainable development, with a mission to deliver value to our clients and empower our talent. Comprising over 3,000 creative, digital, and innovative individuals connected to a shared purpose and capable of building connections with people worldwide. A responsible, flexible team with high adaptability to our clients’ and the market’s needs—while consistently delivering value, vision, creativity, expertise, professionalism, and passion for technology in every project. Our core values guiding us toward excellence are collaboration, innovation, commitment, fun, and trust. **What do we value?** At least 3 years of experience as a Backend Developer in: * JavaScript (NodeJS) and REST and GraphQL API development. * Relational databases, especially PostgreSQL. * Containerization and virtualization using Docker. * Ability to work collaboratively in teams and closely with other developers. * Strong development practices: testing, documentation, and version control. * Proactive attitude and eagerness to learn. * English proficiency is not mandatory but considered a plus. **What would your responsibilities be?** * Backend Development: Build and maintain applications using NodeJS, ensuring clean, scalable, and efficient code. * API Integration: Design, implement, and maintain REST and GraphQL APIs, ensuring correct communication between services and applications. * Database Management: Administer and optimize PostgreSQL databases, ensuring performance and reliability. * Containerization: Implement and manage applications in Docker environments, ensuring portability and consistency across development, testing, and production environments. * Multidisciplinary Collaboration: Work closely with other developers, QA teams, and business stakeholders to deliver complete, high-quality solutions. * Continuous Improvement: Apply best development practices—including documentation, testing, and version control—to foster technical excellence and continuous learning. And with us, you’ll enjoy: Permanent Contract Hybrid work model: 3 days remote, 2 days in the office in **Barcelona** Internal training and access to certifications. Check our calendar here: https://www.knowmadmood.com/es/talento/formacion Flexible compensation plan (health insurance, transportation allowance, childcare vouchers, meal vouchers) Become a brand ambassador through our referral program Refer your friends and earn a bonus! Events, meetups, tech days, talks—and much more! *At ***knowmad mood***, we are committed to equal opportunities and respect for diversity. We apply our Equality Plan and the principle of non-discrimination across all recruitment processes.*