Voice engineer

About Mixvoip

We’re Mixvoip - a vibrant Luxembourg-based company delivering cloud telephony, smart networking, and high-speed internet services, mainly across Europe.

We believe in giving businesses a fresh take on communication systems - simple, reliable, and future-ready. That’s where you come in! We’re looking for a Voice engineer to help us oversee and evolve our voice infrastructure, ensuring it stays efficient, secure, and ahead of the curve.

About the role

As a Voice engineer at Mixvoip, you’ll help maintain, improve, and deploy our in-house voice solutions - the systems powering our core network and PBXs across 15 regulated countries.

You’ll code, debug, and collaborate - listening to clients’ needs, analyzing system behaviors, and solving problems hands-on. The role also includes Level 2 support and regular contact with telecom regulators and industry partners.

Key responsibilities

• Design, deploy, and maintain enterprise voice solutions (VoIP core platform and in house developed PBXs).
• Ensure quality of service (QoS), call continuity, and system reliability across voice networks.
• Configure and troubleshoot unified communications systems, cloud voice platforms, and on-premises solutions.
• Implement and maintain security standards for voice communications (encryption, fraud detection).
• Improve security architecture in collaboration with system administrator and cybersecurity teams.
• Analyse SIP call flows and call related log files.
• Provide technical support and training across internal teams and, where relevant, clients.
• Coordinate with vendors and third parties for system implementation and upgrades.
• Automate provisioning and monitoring processes using scripting.
• Maintain compliance with telecom regulations in countries that Mixvoip operates in as well as within GDPR, NIS2, DORA, and ISO 27001.

What do we need from you?

• Familiarity with basic voice systems or platforms (such as VoIP, cloud telephony, or PBX) is a plus, but curiosity and willingness to learn matter most.
• Understanding how networks and internet connections work (UDP/IP, basic concepts); no need to be an expert yet.
• Knowledge of the SIP protocol is appreciated
• A problem-solving mindset: Enjoy asking questions, digging into issues, and finding solutions.
• Eagerness to develop skills in scripting or automation - any experience with PHP or Python is great.
• An interest in telecommunication standards, privacy, and security - no prior experience required, just readiness to grow in these areas.
• Comfortable working with Linux systems, even if you’re just starting out.
• Motivation and a problem-solving orientated mindset
• Participation in an on-call rotation: This means periodically being available to resolve urgent issues outside regular working hours for our SLA clients and in case of alarms from our monitoring.

What would make you stand out?

• Experience from a school project, internship, or part-time job in telecom or IT—a few months is enough to impress.
• Genuine interest in unified communications, telephony, or digital networks.
• Any telecom or network related certification (even entry-level or in progress)
• Knowledge of Freeswitch or Asterisk or SIP
• Projects, hobbies, or online courses related to voice technology or networking.

We know we’re asking for a lot, but here’s the exciting part: You'll join a skilled, supportive team ready to help you grow. We value passion and potential over perfection - if you’re eager to learn, apply. Once you’re settled, you’ll also enjoy flexibility in your working hours.

Our way to support you the best

Don’t hesitate to apply even if you don’t meet every requirement yet. What matters most to us is your curiosity and eagerness to grow.

We’ll train you - not just during onboarding - but every day through mentorship from senior engineers. You’ll gain deep knowledge of SIP, telecom compliance, and real-world systems. With our support, you’ll become a trusted expert in the field - ready to shape the future of telecommunications with us.

Why Mixvoip?

Mixvoip offers a unique environment where engineers can truly shape technology - from architecture and automation to security and performance. You’ll work on large-scale voice systems deployed across 15+ countries, gaining hands-on experience that few roles can match.

Here, your ideas matter. We encourage experimentation, support personal growth, and invest in helping every team member become an expert in their craft.

A new way to apply: Join Mixvoip’s success story

Join Mixvoip and you won’t just be connecting businesses to high-speed internet, fiber, satellite, phone, or mobile networks – you’ll be connecting people, forging relationships, and making a real difference in our story.

So, if you’re prepared to embark on an engaging journey and play a pivotal role in Mixvoip’s saga, here’s an unconventional route to apply

We invite you to record a brief video with your smartphone. Share why you’re drawn to this role or pose any questions or doubts you might have. It’s about keeping the conversation open and engaging! Please remember to attach your CV in PDF format too.

Instead of a conventional motivational letter, we’d like you to employ an AI of your choice. This not only mirrors our technology-focused approach, but it also allows you to showcase your adaptability to new tools. It’s less about the letter, more about your interaction with AI that we’re keen on.

PS: Want to know who you’ll be journeying with? Meet me, Clemens Kistinger

I’ve spent more than 15 years immersed in the world of Voice over IP and carrier operations, making sure systems run smoothly, securely, and reliably. At Mixvoip, I’m driven by one goal: to make our technology effortless for our clients.

I love solving real-world problems, experimenting with new ideas, and seeing how small innovations can make a big difference.

Outside of work, I enjoy traveling and spending time with my family - they’re my best source of balance and inspiration.

Join us, and you won’t just be working on technology - you’ll be part of a team that values creativity, collaboration, and genuine impact.