Principal Engineer — OSS & Infrastructure

You will design the technology estate, build it, and operate it. This is a hands-on senior individual-contributor position, growing into leadership of a small engineering team.

The benefits of being part of the team:

Compensation package

• Attractive salary based on your performance
• Monthly food vouchers – €52
• Device voucher – €312
• 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 you will do:

• Design the target technical architecture across network systems, inventory, provisioning, integration and infrastructure
• Build and operate the platforms, from implementation through to day-to-day running
• Consolidate network inventory and geographic information systems, and lead the data migration
• Design and implement service activation across multiple access equipment platforms
• Design and establish the infrastructure: hosting, networking, identity management, backup and recovery
• Define system integration interfaces and the APIs exposed to wholesale customers
• Write technical requirements for major procurements and lead the technical evaluation of proposals
• Act as the organisation’s technical counterpart to equipment vendors and system integrators
• Lead and develop the engineers who join the team

What we are looking for?

• At least 8 years in telecommunications technology, including 3 in a principal, architect or technical lead role
• Hands-on experience with telecommunications operational systems — network inventory, geographic information systems, service activation or fault management. Advisory, consulting or pre-sales experience alone is not sufficient for this role
• Working knowledge of fibre access technology: GPON, OLT and ONT equipment and associated element management systems
• Demonstrated experience of migrating data from legacy systems, including assessment and remediation of data quality
• Infrastructure engineering: Linux, virtualisation, cloud and colocation environments, networking, identity management
• Ability to specify technical requirements that suppliers can be held to, and to evaluate vendor claims critically
• Comfortable operating as the sole technical specialist during an early build phase
• Fluent Bulgarian and English

Nice to have:

• Geographic information systems in a telecommunications context — outside plant, fibre routes, splice management
• Subscriber management technologies: TR-069 device configuration, RADIUS and AAA, particularly in multi-tenant configurations
• Wholesale or open-access network operations
• Familiarity with TM Forum standards and Open APIs

Become part of our team!

APPLY NOW! Click “Кандидатствай” and send your CV by 7th of December 2026.

Only shortlisted candidates will be invited for an interview.