Mobile Core & Voice Services Engineer – Sofia

Compensation package

• Attractive salary based on your performance
• Monthly food vouchers – €52
• Device voucher – €498
• SIM card with an Unlimited plan
• No cap on bonuses under the “Refer a Friend” program
• Preferential conditions for Vivacom services for you and your loved ones  

Work–Life Balance

• 3 extra days if you use up your entire annual paid leave
• 1 day off for your birthday
• Flexible working hours
• Hybrid working model depending on the position
• Additional health insurance for you and your family
• Co-financed sports card
• Discounts at over 100 great places – shops, restaurants, hotels

Not just a job. Growth.

• Personal mentor and access to an interactive e-learning platform
• A real career development plan

What will your responsibilities be?

• Work at the heart of mobile communications — configure and maintain key elements of the GSM/UMTS/IMS core network
• Analyse and resolve technical issues as part of second-level support for the mobile core network
• Coordinate fault resolution and implement solutions to restore services within agreed service levels (SLAs)
• Establish interconnections with other fixed and mobile operators and troubleshoot related issues
• Plan and carry out preventive activities to improve network reliability and minimise service disruptions
• Participate in planning and delivering projects to develop the mobile network
• Test new switching elements and support their introduction into service

What we are looking for?

• A university degree in Telecommunications, Information Technology or Radio Electronics
• Knowledge of mobile cellular networks and IMS architecture
• Understanding of telecommunications protocols and signalling — TCP/IP, MAP, SCCP, C7, SIP and Diameter
• Knowledge of IP/MPLS core networks and Unix/Linux operating systems
• Excellent computer skills, including proficiency in MS Office
• Excellent command of English, both written and spoken
• Strong organisational skills, an analytical approach and a proactive attitude towards problem-solving
• Strong communication and teamwork skills
• Willingness to work shifts

Become part of our team!

APPLY NOW! Click “Кандидатствай” and send your CV by 9th of December 2026.

Only shortlisted candidates will be invited for an interview.