Core Network Engineer - Voice Core

Core Network Support Engineer - Voice Core (f/m/x)

Ready to ensure stable and high-quality voice services and act as a key technical interface between operators and vendor teams? Then we would love to hear from you!

Salary: € 3000-5000 gross 14x per year + monthly amount for on-call duty

Location: Vienna, 21st district

Technologies: ISUP | MAP | SIP | Diameter | GTP | Linux | Openstack | Container | IMS | 2-5G

Sector: Telecommunication

Working hours: Flexible work time with possible on-call duty

Team Size: 10 members

What will I do here?

• Vendor Interface & Technical Support: Act as the technical representative for telecom operators and coordinate with internal Level 3 / R&D teams for issue resolution.
• Voice Core Operations & Maintenance: Operate and maintain IMS and voice core elements (e.g., CSCF, HSS/UDM, SBC, MGW, TAS) including VoLTE/VoNR services in virtualized environments.
• Incident Management & Troubleshooting: Investigate and resolve voice service issues (e.g., SIP signaling, call setup failures, interconnect issues) to ensure high service availability.
• Signaling & Interconnect Analysis: Analyze SIP and legacy signaling (SS7/MAP/ISUP) and support roaming as well as inter-operator voice connectivity.
• Change Management & Service Quality: Perform system upgrades and configuration changes while monitoring KPIs and improving overall voice service performance.

What should I bring with me?

• Education & Experience: Degree in Telecommunications, IT, or a related field, or equivalent hands-on experience in mobile core network environments.
• Packet Core Expertise: Solid knowledge of EPC and/or 5G Core technologies (e.g., MME, SGW/PGW, AMF, SMF, UPF, PCRF/PCF, ePDG).
• Protocols & Troubleshooting: Strong understanding of telecom protocols (GTP, Diameter, TCP/IP) and experience in troubleshooting mobile data services.
• Linux & Cloud Fundamentals: Familiarity with Linux systems and exposure to virtualization or cloud-native environments.
• Communication & Ownership: Team-oriented mindset with strong communication skills, proactive approach, and ability to work under pressure in dynamic environments.

About the Company

The company is a leading international telecommunications vendor, providing innovative solutions for voice and core network services. Join the international Core Network team (10 members) and take on a vendor-facing role, supporting major mobile network operators in Austria in the operation, troubleshooting, and continuous improvement of their Voice Core and IMS environments.

Salary

€ 3.000 to € 5.000 (paid 14 x p.a.), depending on qualifications and experience.

📩 Aplication Process:

1. Initial interview with STEINER-HITECH via video call
2. Video Call with the Core Network Team
3. We’ll guide you through the entire process!

👨 Your Contact Person:

Sascha Muff

[email protected]

+43 1 876 77 88

Talpagasse 1A, 1230 Wien

www.steiner-hitech.at