Reliable IT infrastructure is essential to keeping international operations connected, secure and running efficiently. From corporate offices to operational sites, the systems behind our business support the people and projects delivering Europe's energy transition.

At SUNOTEC, we design and deliver large-scale renewable energy infrastructure, combining solar power generation, battery energy storage, grid infrastructure and lifecycle services. With more than 680 projects delivered and over 15 GW of installed capacity, our operations span multiple international markets.

As our business continues to grow, we're looking for an IT Infrastructure Engineer to join our IT & Digital team in Sofia.

Why this role matters:

Behind every successful project is an IT infrastructure that people can depend on.

As an IT Infrastructure Engineer, you'll help ensure that SUNOTEC's systems, networks and cloud environments remain secure, reliable and ready to support our growing international operations.

Working closely with our IT Operations Manager, cybersecurity specialists, internal teams and external technology partners, you'll take ownership of infrastructure operations, resolve complex technical challenges and contribute to improvements that strengthen performance and security.

This is a hands-on engineering role where your technical decisions will directly affect business continuity, operational efficiency and the experience of colleagues across our offices and project sites.

Where you'll make an impact:

• Keep our infrastructure running reliably by maintaining the availability, performance and security of IT services across offices, operational sites, cloud platforms and end-user environments;
• Take ownership of complex technical incidents, identifying root causes and implementing lasting solutions that prevent recurring issues and minimise business disruption;
• Deliver infrastructure improvements, including system upgrades, migrations and configuration changes, with appropriate testing, validation and recovery procedures;
• Strengthen infrastructure security through effective identity and access management, system hardening, patching and vulnerability remediation;
• Protect business continuity by monitoring backup and recovery processes, performing restoration tests and supporting disaster recovery readiness;
• Improve efficiency through automation by simplifying repetitive operational tasks, standardising infrastructure configurations and proactively identifying performance and capacity risks;
• Support infrastructure projects from implementation to operation, ensuring new and updated services are properly documented, tested and ready for handover;
• Work across teams and technology partners to resolve technical challenges, communicate infrastructure risks and maintain clear technical documentation, procedures and operational standards.

What will help you succeed:

• You bring at least 3 years of hands-on experience in IT Infrastructure Engineering, System Administration or a similar IT operations role;
• You have strong practical knowledge of Microsoft 365, Microsoft Entra ID, Active Directory, Intune and Windows Server, including hybrid identity and endpoint management environments;
• You're experienced in managing AWS or comparable cloud infrastructure, alongside virtualisation technologies such as VMware or Hyper-V;
• You have a solid understanding of networking fundamentals, including TCP/IP, DNS, DHCP, VLANs, VPNs, firewalls and network troubleshooting;
• You're familiar with infrastructure security practices, including identity and access management, patch management, system hardening and vulnerability remediation;
• You have practical experience with backup, restoration and disaster recovery, and understand how these processes support business continuity;
• You can use PowerShell or similar scripting tools to automate routine tasks and improve operational efficiency;
• You understand Incident, Problem and Change Management practices and apply a structured approach to troubleshooting, documentation and technical changes;
• You take ownership of technical issues through to resolution, communicate clearly with different stakeholders and work comfortably in English, both written and spoken.

It would be an advantage if you also have experience with:

• Microsoft Defender, Microsoft Graph or enterprise firewall technologies such as FortiGate;
• Linux administration, SIEM solutions or infrastructure monitoring platforms;
• AWS IoT Core, MQTT or other IoT technologies;
• Industrial IT or Operational Technology (OT) environments;
• Relevant certifications from Microsoft, AWS, VMware, Fortinet or ITIL.

Why you'll enjoy working here:

You'll join an international company where IT infrastructure supports real-world engineering and energy projects across multiple countries.

You'll work with a broad technology environment, collaborate with colleagues from different technical disciplines and have the opportunity to influence how our infrastructure is managed, secured and improved.

We value people who take ownership, approach technical challenges with curiosity and look for practical ways to make systems work better.

Alongside the opportunity to contribute to our growing IT operations, you'll benefit from:

• A remuneration package reflecting your experience and the responsibilities of the role, including a performance-based annual bonus.
• Full-time employment contract.
• 24 days of paid annual leave.
• Additional health insurance, including dental care.
• Multisport card with employer contribution.
• Home office options in line with company policy.
• Access to an internal learning platform, professional training and support for relevant certifications.
• Wellbeing initiatives, office workouts and team activities.
• A modern office environment at our Sofia headquarters.

The position is based in Sofia and may involve occasional travel to other SUNOTEC offices and operational sites, as well as participation in planned infrastructure activities or critical incident support outside regular working hours.

Ready to make an impact?

If you enjoy solving complex infrastructure challenges and want to see how your work supports an international business delivering renewable energy projects across Europe, we'd like to hear from you.

Send us your CV in English and join the team behind SUNOTEC's technology operations.

Only shortlisted applicants will be contacted. Your documents and personal data will be treated as confidential and protected in accordance with Bulgarian data protection legislation and the General Data Protection Regulation (GDPR).