System Engineer - Linux/VoIP Applications

Job Introduction

FREQUENTIS Solutions & Services s. r. o. , as a member of the Austrian Group FREQUENTIS AG, is focused on software development, system engineering and delivery of safety-critical voice communication and information systems. Our solutions are developed and distributed in the following business segments: Air Traffic Management & Defence (civil and military air traffic control, aeronautical information management), Public Safety (police, fire and rescue services, emergency medical services) and Public Transport & Maritime (railway and urban transport solutions, vessel traffic management).

Frequentis provides mission‑critical communication, information, and surveillance solutions that support military organisations in maintaining combat readiness and executing operations with high reliability. Its systems offer fully redundant, highly available communication frameworks, enabling secure inter‑service collaboration and shared situational awareness for faster and more accurate decision‑making in critical situations. Frequentis also delivers advanced voice communication systems, command‑and‑control solutions, and deployable air traffic control technologies tailored to defence environments.

Your Role We are looking for a savvy Voice Over IP Communications System Engineer with knowledge from the Linux platform, who will take a key role in the SIP technical implementation and service lifecycle of our systems, ensuring both delivery excellence and high-quality service support for our customers in the Defence domain.

Join our team and help make our systems even more reliable and customer oriented. Work for an international technological leader and enjoy flexible working arrangements, professional growth opportunities, and a strong focus on work-life balance.

Working Model

• Hybrid working model with occasional home office
• Regular travel to our Vienna headquarters (typically once per week; up to three times per week during key project phases)
• International business travel approximately 25–30% of the time for customer installations, upgrades and acceptance activities
• Company cars are available for business travel to Vienna

Key Tasks

• Plan, design, and implement technical solutions for customer delivery projects, ensuring compliance with system requirements and quality standards including activities performed at customer´s sites
• Integrate systems and components into complex environments
• Perform system audits, participate in site acceptances, and ensure system readiness
• Prepare and maintain technical documentation, including configuration records, design specifications, and operational manuals
• Assist customers with technical questions related to system operation, configuration, and service
• Collaborate with Product Management on designing and extending/improving products
• Support the transition of delivery projects into the service phase, ensuring smooth knowledge transfer and operational readiness
• Service and maintenance duties: Handle service tickets (incidents, problems, configuration changes) within agreed response times and participate in on-call duties. Document and analyze reported incidents and problems, coordinate and carry out root cause analyses and remedies

Key Qualifications Technical Skills & Competencies

• Installation, configuration, and maintenance of Linux servers (preferably RHEL), including upgrades and troubleshooting
• Bash scripting proficiency
• Solid experience with virtualization platforms (VMware and KVM preferred)
• Understanding of VoIP technologies (SIP) and experience with SBC & PABX systems
• Familiarity with various storage technologies and basic networking concepts and configurations (CISCO preferred)
• Understanding of clustering principles
• Ability to create clear technical documentation, including step-by-step guides, specifications, and requirements
• Ability to quickly adapt to frequent software releases and evolving environments
• Strong analytical and troubleshooting skills in distributed system environments
• Precise and structured documentation practices

Skills Considered As An Advantage

• Experience with Windows Server installation and maintenance
• Experience with cloud platforms (AWS, Azure, etc.)
• Experience with database system (MySQL, MSSQL, PostgreSQL, Oracle DBMS)
• Experience with monitoring systems (Zabbix)
• Experience with monitoring and backup solutions
• Familiarity with automation tools (Ansible)
• Experience with service management frameworks (e.g. ITIL)

Personality Requirements & Skills

• Customer-oriented mindset with a focus on delivery excellence
• Professional communication skills, even in critical situations
• Willingness to undergo security clearance (NBÚ)
• Willingness to participate in an on-call duty rotation
• Strong professional communication and client‑relationship skills, including in critical situations and under time pressure
• Flexible, self‑driven, goal‑oriented, and structured in your approach to work
• Ability to follow corporate processes and standards
• Comfortable working both on-site with customers and in the office (Vienna and Bratislava), balancing technical work with communication and coordination
• Willingness to travel regularly to Vienna or to customer sites for installations, upgrades, and acceptance activities (typically planned, not ad-hoc)

Candidates with education suit the position

• Secondary with school-leaving examination
• University education (Bachelor's degree)
• University education (Master's degree)

Educational Specialization

• Information Technology
• Telecommunications

Language Skills

• English - Advanced (C1) and Slovak - Intermediate (B1)

Our Values

Around 2,600 employees are committed to creating a safer world with their innovative strength and technology orientation. Our culture is based on a working environment characterized by fairness and trust, mutual respect and appreciation. As an international company, we value this diversity and recruit regardless of age, gender, origin, ethnicity, sexual orientation or religion. We value fair and good working conditions, an optimum work-life-balance and offer all our employees equal development opportunities. In doing so, we focus on long-term working relationships in order to keep the valuable know-how of our employees stable.

Benefits We offer an international and exciting work environment with manifold opportunities to grow both personally and professionally. Happiness and commitment of our employees is a key contributor to our success and we therefore put strong emphasis on our team spirit and a healthy work-life-balance. We are located in a modern office building with good public transportation connections, close to the city center of Bratislava.

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