Senior IT Infrastructure Engineer

FRISTA is a company based in Basel, Switzerland, which helps organizations grow by implementing outsourcing, nearshoring and offshoring models tailored to their needs. We work with SAP and Microsoft technologies, combining them with practical experience in business and technology consulting. We support companies in transforming areas such as finance and operations, HR, IT, customer service and marketing. About the Role: We are looking for an experienced Senior IT Infrastructure Engineer to join our IT team in Warsaw. This is a hands-on role for an engineer who enjoys working across enterprise infrastructure, Microsoft cloud technologies, networking and cybersecurity. You will play a key role in maintaining and continuously improving our IT environment, ensuring reliable, secure and high-performing technology services that support our business. Your Responsibilities Administer and maintain network, server and cloud infrastructure.Monitor system performance, troubleshoot and resolve incidents.Implement infrastructure improvements and ensure system reliability.Support backup, disaster recovery and business continuity activities.Administer Microsoft 365, Azure, Exchange Online, Entra ID and Intune.Manage user identities, cloud resources and endpoint services.Ensure the secure and reliable operation of Microsoft cloud technologies.Manage firewalls, VPN connectivity and infrastructure security.Support ISO 27001 compliance and security best practices.Maintain technical documentation and coordinate with external technology partners.Support business-critical applications, SQL-based systems and telephony services.Ensure the availability and reliability of production environments. Our Requirements: 3–5 years of experience in IT Infrastructure, Systems Administration or Cloud Operations.Practical experience with Microsoft 365 and Microsoft Azure.Good knowledge of Windows Server, networking, VPNs and firewall administration.Strong troubleshooting and analytical skills.Ability to work independently and take ownership.Very good command of English (C1).Nice to Have: Microsoft or Cisco certifications.Experience with SQL Server administration.PowerShell scripting skills.Experience with Microsoft Intune and Entra ID.ITIL Foundation or ISO 27001 experience. We Offer: Real opportunities for professional growth while contributing to innovative projects and automation initiatives.Private medical care (Lux Med).Co-financing of a Multisport card to support your well-being and active lifestyle.Co-financing for meals.Access to company training programs.Additional day off to celebrate your birthday.A diverse and inclusive work environment that values different perspectives, experiences and ideas.A friendly and supportive working environment with a strong team culture.Hybrid working model – we work from our centrally located office in Warsaw 3–4 days per week, combining in-office collaboration with remote flexibility. Join Us If you enjoy solving technical challenges, working with modern infrastructure technologies and taking ownership of business-critical IT services, we would love to hear from you.