Principal Systems Engineer | NUACOM

About NUACOM:
Established in 2009, NUACOM is Ireland’s leading B2B Cloud Business Phone System provider. Our mission is to harness cutting-edge technology to create seamless and innovative live communication tools for businesses worldwide.
As we continue to expand, we are seeking ambitious and talented individuals ready to make an impact, drive innovation, and help shape the future of business communications.

The Opportunity:
NUACOM is on the lookout for a seasoned Principal Systems Engineer — an expert in high-availability systems, infrastructure design, and VoIP technologies. This is more than just a technical role; this is an opportunity for the right individual to step into a leadership path with the potential to evolve into the role of Chief Technology Officer (CTO).
You will lead, shape, and oversee both technical strategy and implementation while managing a small but highly capable team. Working closely with the CEO, Product Development, and Customer Service teams, you will play a critical role in ensuring the stability, security, and scalability of our systems.

The Role:

• Design, deploy, monitor, and maintain robust Linux-based infrastructure across colocation data centers and AWS cloud environments.
• Lead the Incident Response and Business Continuity planning, including active participation during maintenance windows and escalations.
• Support the development team by refining CI/CD pipelines and automated deployment practices.
• Oversee infrastructure monitoring and optimization using modern observability tools.
• Act as a senior escalation point for the Level 3 Support team.
• Directly manage a small team of system engineers, driving accountability and growth.
• Help set and enforce security and reliability standards that align with industry best practices.

Experience & Skills Required:

• 10+ years of experience in a senior-level systems or site reliability engineering role.
• Proven experience building and scaling high-availability, distributed systems.
• Deep expertise in Unix/Linux systems administration.
• Strong relational database management knowledge: MySQL/MariaDB including replication and scaling methods.
• Advanced knowledge of networking: iptables, nftables, VLAN, BGP.
• VoIP proficiency: SIP, RTP, WebRTC, and experience with Asterisk, FreeSwitch, Kamailio, or OpenSIPS.
• Solid AWS or similar public cloud knowledge and experience
• Skilled with automation/configuration tools like Ansible or Puppet.
• Hands-on experience with monitoring stacks such as ELK Stack, Prometheus, Grafana.
• Experience with Message Queuing systems (RabbitMQ, NATS, or similar).
• Scripting experience in at least two server-side languages: Bash, Go, PHP.
• Virtualization and containerization expertise: VMWare, Proxmox, Docker.
• Strong grasp of cybersecurity best practices.
• Excellent communication skills in both written and spoken English.

The Value You Deliver:

• Lead, develop, and implement both high-level and detailed infrastructure designs aligned with NUACOM’s growth roadmap.
• Collaborate closely with business and tech teams to improve deployment velocity, code quality, and platform availability.
• Simplify complex systems through refactoring, automation, and consistent practices to foster reliability and scalability.
• Act as a champion for DevSecOps principles and modern engineering culture, transforming both operational capabilities and development workflows.
• Mentor, empower, and grow your team, fostering a culture of curiosity, ownership, and technical excellence.

What We Offer:

• Fair salary and performance-based year-end rewards.
• Private medical insurance scheme.
• Company-provided equipment and relocation assistance if needed.
• Flexible working hours and hybrid/remote work options.
• Modern, accessible office space in Maynooth — free from heavy Dublin traffic.
• Ongoing upskilling, training, and study support.
• Company social events and team-building activities.

Ready to shape the future of cloud communications?
If you are an experienced systems engineer seeking full ownership of your role and excited by the prospect of becoming a future CTO, we want to hear from you.

So if you find this vacancy suitable for you, please send your CV to our recruitment partner hr@mantis.md and they will contact you for an interview.

We thank you for your interest in our career opportunities!