JORDAN OSTREV

Head of Mobile Core Network & Packet Services
📍 Sofia, Bulgaria 📞 (+359) 878500555 ✉️ jostreff@gmail.com 🔗 linkedin.com/in/jostreff
Executive Summary: Accomplished Telecommunications Executive and Mobile Core Infrastructure Architect with 25+ years of experience leading core network planning, design, and deployment. Proven track record in orchestrating multi-vendor EPC/5G migrations, CUPS implementations, and high-availability Telco Cloud architectures (VMware/OpenStack). Strong leader in cross-functional team management, vendor negotiations, and high-level strategy.
Professional Experience
07/2010 – Present
Head of Development & Planning - Packet Services
BTC Ltd. (Vivacom) | Sofia, Bulgaria
  • Strategic Network Leadership: Directing team responsible for engineering, capacity planning, and architectural development of Mobile Core Network Packet Services.
  • 5G & Next-Gen Core Integration: Architected and executed planning/implementation of 4G/5G services and Control-User-Plane-Separation (CUPS) architecture.
  • Vendor Migration & Swaps: Managed seamless swaps and transitions between major vendors (Ericsson, Huawei, Nokia, Cisco) with zero service disruption.
  • Telco Private Cloud: Designed and implemented distributed VMware Telco Private Cloud and Ericsson Cloud Execution Environment (CEE/OpenStack).
  • Core Infrastructure: Overseeing MPBN (MPLS & Segment Routing Core), PCRF, SGSN-MME, GGSN/SGW/PGW, CGNAT, and IPX/GRX connectivity.
  • Governance & Compliance: Implemented EU roaming regulations, bill-shock prevention systems, and conducted C-level executive technical proposals.
03/2009 – 06/2010
Team Leader GSM Core Network - Packet Services
BTC Ltd. (Vivacom) | Sofia, Bulgaria
  • Led operations and configuration of GSM Core packet infrastructure (SGSN/GGSN, MPLS, VRRP, IPSEC).
  • Deployed high-availability monitoring tools and established Level-2 technical support procedures.
01/2005 – 02/2009
Senior Value Added Services (VAS) Engineer
BTC Mobile Ltd. (vivatel) | Sofia, Bulgaria
  • Managed HA platforms for WAP Gateway, MMSC, PoC, MDSP real-time billing, and custom streaming solutions.
  • Engineered custom SS7<->SIP/RTP video gateway solutions and high-availability database clusters.
12/1996 – 01/2005
Senior System Administrator & Developer Roles
RTC Ltd. / Mobikom / Lirex Ltd.
  • Mobikom (2001-2005): Architected AAA, RADIUS, Tacacs+, e-mail/SMS gateways, and dynamic routing HA setups.
  • Lirex (1999): Core engineer for Bulgarian National Identity Cards infrastructure project.
Core Competencies
Mobile Core & 4G/5G
EPC, PCRF, SGSN-MME, SGW/PGW, VoWiFi, CUPS, 5G Core Architecture, IPX/GRX
Network & Routing
MPBN, MPLS, Segment Routing, BGP, OSPF, CGNAT, Firewalls (Palo Alto, CheckPoint, Cisco ASA)
Telco Cloud & Virtualization
VMware NFVI, Ericsson CEE, OpenStack, KVM, vSAN, High Availability Clusters
Vendors & Platforms
Ericsson, Huawei, Nokia, Cisco/Starent, Alcatel-Lucent, Sun Solaris, Linux
Education
PhD Candidate (ICT)
Technical University of Sofia
M.Sc. Computer Science
Technical University of Sofia
Certifications
  • Ericsson: 5G Core Concepts, Protocols & Procedures, VoLTE E2E
  • ITIL v3: Service Design & Foundations
  • Cisco: IOS XR Advanced Deploy, CCNA
  • PMP: Exam Prep Course
  • Huawei: SGSN/GGSN O&M, UPCC Policy
Languages
Bulgarian: Native
English: C1 (Proficient)
Russian: C2 (Master)
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JORDAN OSTREV

Head of Mobile Core Network & Packet Services
📍 Sofia, Bulgaria 📞 (+359) 878500555 ✉️ jostreff@gmail.com 🔗 linkedin.com/in/jostreff
Executive Summary: Accomplished Telecommunications Executive and Mobile Core Infrastructure Architect with 25+ years of experience leading core network planning, design, and deployment. Proven track record in orchestrating multi-vendor EPC/5G migrations, CUPS implementations, and high-availability Telco Cloud architectures (VMware/OpenStack). Strong leader in cross-functional team management, vendor negotiations, and high-level strategy.
Professional Experience
07/2010 – Present
Head of Development & Planning - Packet Services
BTC Ltd. (Vivacom) | Sofia, Bulgaria
  • Strategic Network Leadership: Directing team responsible for engineering, capacity planning, and architectural development of Mobile Core Network Packet Services.
  • 5G & Next-Gen Core Integration: Architected and executed planning/implementation of 4G/5G services and Control-User-Plane-Separation (CUPS) architecture.
  • Vendor Migration & Swaps: Managed seamless swaps and transitions between major vendors (Ericsson, Huawei, Nokia, Cisco) with zero service disruption.
  • Telco Private Cloud: Designed and implemented distributed VMware Telco Private Cloud and Ericsson Cloud Execution Environment (CEE/OpenStack).
  • Core Infrastructure: Overseeing MPBN (MPLS & Segment Routing Core), PCRF, SGSN-MME, GGSN/SGW/PGW, CGNAT, and IPX/GRX connectivity.
  • Governance & Compliance: Implemented EU roaming regulations, bill-shock prevention systems, and conducted C-level executive technical proposals.
03/2009 – 06/2010
Team Leader GSM Core Network - Packet Services
BTC Ltd. (Vivacom) | Sofia, Bulgaria
  • Led operations and configuration of GSM Core packet infrastructure (SGSN/GGSN, MPLS, VRRP, IPSEC).
  • Deployed high-availability monitoring tools and established Level-2 technical support procedures.
01/2005 – 02/2009
Senior Value Added Services (VAS) Engineer
BTC Mobile Ltd. (vivatel) | Sofia, Bulgaria
  • Managed HA platforms for WAP Gateway, MMSC, PoC, MDSP real-time billing, and custom streaming solutions.
  • Engineered custom SS7<->SIP/RTP video gateway solutions and high-availability database clusters.
12/1996 – 01/2005
Senior System Administrator & Developer Roles
RTC Ltd. / Mobikom / Lirex Ltd.
  • Mobikom (2001-2005): Architected AAA, RADIUS, Tacacs+, e-mail/SMS gateways, and dynamic routing HA setups.
  • Lirex (1999): Core engineer for Bulgarian National Identity Cards infrastructure project.
Core Competencies
Mobile Core & 4G/5G
EPC, PCRF, SGSN-MME, SGW/PGW, VoWiFi, CUPS, 5G Core Architecture, IPX/GRX
Network & Routing
MPBN, MPLS, Segment Routing, BGP, OSPF, CGNAT, Firewalls (Palo Alto, CheckPoint, Cisco ASA)
Telco Cloud & Virtualization
VMware NFVI, Ericsson CEE, OpenStack, KVM, vSAN, High Availability Clusters
Vendors & Platforms
Ericsson, Huawei, Nokia, Cisco/Starent, Alcatel-Lucent, Sun Solaris, Linux
Education
PhD Candidate (ICT)
Technical University of Sofia
Thesis: 4G Network Services for Industry
M.Sc. Computer Science
Technical University of Sofia
Electronics & Automation Engineer
Key Certifications
  • Ericsson: 5G Core Concepts, Protocols & Procedures, VoLTE E2E
  • ITIL v3: Service Design & Foundations
  • Cisco: IOS XR Advanced Deploy & Troubleshoot, CCNA
  • PMP: Exam Preparation Course
  • Huawei: SGSN/GGSN O&M, UPCC Policy Config
Languages
Bulgarian Native
English C1 (Proficient)
Russian C2 (Master)