Senior IT Systems Engineer (Linux & Networking)

Take end-to-end ownership of critical IT infrastructure spanning on-premises, network, and cloud platforms, and play a key role in shaping the future of our internal engineering capabilities. You will help drive the evolution of a complex hybrid environment toward a modern, automated, and cloud-first architecture.

As a senior member of the team, you will deepen our expertise across systems, networking, and cloud infrastructure, supporting a strategic transition to Azure- and AWS-based platforms. You will integrate advanced Secure Service Edge (SSE) capabilities developed in-house into our corporate environment, and collaborate closely with Platform, Product, and Security engineering teams to solve challenging problems, reduce complexity, and improve performance across our core infrastructure.

What You'll Do

Core Responsibilities

Design, implement, and operate internal IT systems across hybrid on-prem and cloud environments.

• Lead modernization initiatives, including cloud migrations, automation, identity integration, and infrastructure consolidation.
• Own and evolve Linux-based platforms, storage, and virtualization layers, along with associated automation in a hybrid environment (cloud-first, with limited on-prem footprint).
• Architect and implement cloud platforms (Azure primary; AWS/GCP secondary), including landing zones, governance, identity integration, and infrastructure-as-code (Terraform) with CI/CD pipelines.
• Build and maintain monitoring, alerting, and logging capabilities in collaboration with Security and Operations teams.
• Ensure business continuity and disaster recovery capabilities meet defined RTO/RPO targets through documented and regularly tested processes.
• Maintain and optimize network connectivity, including peering relationships with upstream autonomous system providers.
• Collaborate with Platform, Product, Security, and Business Application teams to design solutions, reduce complexity, and improve performance across core systems.
• Troubleshoot complex, cross-domain issues spanning network, OS, virtualization, identity, and cloud layers.
• Participate in an internal on-call rotation as required (upon Mission Control NOC certification).

Strategic Responsibilities

• Identify capability gaps and drive solutions aligned with IT and cloud-first strategy.
• Act as a subject matter expert across infrastructure domains (network, storage, compute, and security).
• Contribute to architectural evolution with a pragmatic, secure-by-default, and Zero Trust mindset.
• Shape cloud governance, identity architecture, and modernization patterns across the environment.
• Support compliance and certification efforts (e.g., ISO 27001, ISAE 3402 Type 2) through implementation and evidence collection.
• Document systems, processes, and standards to support cross-team clarity and scalability.

• 7+ years of experience in IT engineering, systems/network administration, or platform engineering.
• Strong expertise in Linux platform management at scale (Ubuntu, RHEL, SUSE, or comparable).
• Proven experience with Azure and cloud platforms (governance, IAM, automation).
• Hands-on experience infrastructure-as-code and automation (Git, Terraform, Ansible, scripting in Python, Shell, PowerShell).
• Solid understanding of networking fundamentals (routing, firewalls, VPN, DNS, DHCP, etc.).
• Experience with hybrid environments, including on-prem infrastructure (e.g., VMware, storage, datacenter operations).
• Ability to operate across disciplines (infrastructure, security, automation) and take end-to-end ownership of solutions.
• Strong collaboration and communication skills, including the ability to work effectively with non-engineering stakeholders.
• Fluency in English; additional languages a plus.
• Valid Swiss work authorization (no sponsorship required).
• Available to work on-site in Zürich at least 40%, or willingness to relocate.

Nice to Have

• Experience with modern cloud-native tooling (Kubernetes, containers, GitOps).
• Experience with monitoring stacks (CheckMK, Grafana, Prometheus, ELK, etc.).
• Experience managing MDM platforms at scale (SUSE Manager, Jamf, Intune).

Want to join a team that enjoys making secure connectivity simple for our customers? You'll be among people who believe in: * Caring PASSIONATELY about keeping our customers safe - We're dedicated to solving problems. Whatever it takes. * Thinking UNCONVENTIONALLY to stay ahead - The world never fails to surprise us. So let's surprise it first. * Doing the hard work to make things SIMPLE - Craft and hone something that delights in its simplicity. * Working COLLABORATIVELY to build success - The power of the team will always make us faster and better. As a testament to this, Open Systems has been recognized as an outstanding place to work. You'll be surrounded by smart teams who enrich your experience and provide opportunities you will need to develop your skills and advance your career. We look forward to receiving your online application (please note that you need to compress your application into two attachments). Only direct applications will be considered. Come as you are! We are looking for amazing people of diverse backgrounds, experiences, abilities, and perspectives. Open Systems welcomes and encourages diversity in the workplace regardless of race, gender, religion, age, sexual orientation, disability, or veteran status. About Open Systems Open Systems is about secure connectivity made easy, combining SD-WAN, Firewall, SWG, CASB, and ZTNA into a framework that supports secure connectivity across cloud and hybrid environments and locations. Open Systems Managed SASE provides a comprehensive SASE solution through an easy-to-use customer portal, underpinned with a unified data platform to drive future innovation, all delivered as a 24x7 managed service.