OT Network Engineer

We're looking for an OT Network Engineer to join Sunly's team and take ownership of the network infrastructure connecting our growing portfolio of renewable energy assets.

In this role, you'll work on implementing, maintaining and improving reliable and secure Operational Technology (OT) networks across our solar, wind and battery storage projects. You'll work closely with technical teams, internal IT and cybersecurity, as well as external engineering and construction partners, to ensure our OT infrastructure meets technical and security requirements.

This role combines network engineering, technical coordination and on-site work, giving you the opportunity to contribute to both new projects and the continuous improvement of our existing infrastructure.

What you will work on

• Plan, implement and improve OT network solutions across renewable energy assets, ensuring reliable and secure connectivity.
• Coordinate with external engineering and construction partners, providing technical input, overseeing implementation and reviewing network designs, project and as-built documentation.
• Conduct on-site inspections, verify network installations and test solutions to ensure compliance with technical and security requirements.
• Maintain, monitor and troubleshoot OT network infrastructure, ensuring reliable connectivity and resolving technical issues.
• Manage OT network access, connectivity and firmware and software updates in collaboration with the internal IT team.
• Coordinate penetration testing with external partners, identify security gaps and work with the cybersecurity team to address vulnerabilities and propose alternative solutions.
• Act as the main OT technical contact during cybersecurity incidents, coordinating technical investigation and remediation with the cybersecurity and IT teams.
• Oversee communication channels between renewable energy assets, grid operators and internal systems, coordinating technical implementation with IT.
• Maintain accurate and up-to-date OT network documentation, including network architecture, configurations and connectivity.

What describes you

• Previous experience in network engineering, preferably within operational technology (OT), industrial automation or critical infrastructure environments.
• Good understanding of networking technologies and protocols, including TCP/IP, routing, switching, VLANs, VPNs and firewalls. Familiarity with industrial OT protocols is a strong plus.
• Hands-on experience configuring, maintaining and troubleshooting network infrastructure, with an understanding of network design principles.
• Understanding of OT cybersecurity principles, network segmentation and secure remote access.
• A structured and independent approach to problem-solving, with strong attention to detail.
• Good communication and coordination skills, with the ability to work effectively with internal teams and external partners.
• Willingness to travel to renewable energy sites for on-site inspections and technical work as needed.
• Fluency in English and Estonian, both written and spoken.
• Genuine interest in renewable energy and eagerness to use innovation and AI in your work.

What we offer

• Support for your wellbeing, inside and outside work - a quarterly sports allowance via Stebby, comprehensive employer-provided health insurance (including dental care and specialist visits), and access to mental health counselling and coaching via siffi.com.
• Time to rest and reset - 28 working days of annual leave, counted only in working days and usable flexibly, plus additional paid days off, including health days and leave for important life events.
• Room to grow professionally - meaningful, hands-on challenges and a dedicated training budget for courses, certifications, and conferences, alongside internal learning opportunities to support your development.
• Flexible hybrid work - we work in a hybrid way, with no fixed rules on office days. You are trusted to balance remote work with time in the office, and while much can be done remotely, a lot happens in the office and being there regularly makes collaboration easier.
• Work that contributes to the energy transition - you will be part of a team building and scaling renewable energy across the region, working on services that support a more sustainable energy system.

If you are excited about contributing to the renewable energy sector, we would love to hear from you! We review applications on an ongoing basis, so we encourage you to apply as soon as possible.

Department

Business Operations

Location

Tallinn