Summary: Seeking a Senior IT Infrastructure Engineer responsible for communications, networks, firewalls, and IT systems, ensuring stability, security, and performance. Highlights: 1. Infrastructure-focused role with strong responsibility for IT systems 2. Opportunity to participate in infrastructure projects 3. Stable, long-term position in a collaborative IT team Barcelona North (Vallès region) We are looking for a Senior IT Infrastructure Engineer to the international end user based in Vallès region. This role is infrastructure\-focused, with strong responsibility for communications, networks, firewalls and IT systems, ensuring stability, security and performance across the organization. Exposure to web development environments is a plus, supporting and evolving internal web platforms, but this is not a pure development role. Key Responsibilities IT Infrastructure (Main Focus) Manage and maintain IT infrastructure, including networks, communications, routers and firewall configurations. Ensure security, availability and performance of servers, systems and IT services. **Participate in infrastructure projects:** upgrades, migrations, cloud initiatives and security improvements. Coordinate infrastructure and communications across multiple sites in Spain. Work closely with the user/hardware support role, focusing on systems and communications, not end\-user support. Web \& Application Environment (Plus) Support and maintain web platforms and applications. Collaborate on improvements and new features for a B2B web platform. Occasional hands\-on development or technical coordination. **Technologies valued:** **Backend:** ASP / .NET **Frontend:** modern JavaScript frameworks Requirements Senior\-level experience in IT infrastructure Strong knowledge of networks, communications, routers, firewalls and IT security. Experience managing servers, cloud services and infrastructure environments. Ability to work autonomously and take ownership of infrastructure topics. High level of English (multinational environment, technical meetings at European level). Web development experience is a plus, not mandatory. What we offer Attractive salary range 1 day remote per week Flexible start time (between 8:00 and 9:30\) and finish at 16:30\-17:30\. Friday intensive schedule. 24 working days of vacation. Flexible benefits (e.g. health insurance). Stable, long\-term position in a collaborative multifunctional IT team. What we value Positive attitude and proactive mindset. Strong sense of responsibility and teamwork. Willingness to work across infrastructure and application environments. If you're ready to take ownership of IT infrastructure and grow your skills in a dynamic, supportive environment, apply today!