Subscribers migrated (0 impact)
Owned planning, MOPs, and execution for the 2026 Cisco ASR5500 MME fleet exit across West (~2M) and East (~3.7M) windows with zero service disruption.
4G / 5G Core Networks · Cloud-Native & DevOps Engineering
Sergey
Levitskiy.
DevOps / Wireless Core Engineer, Packet Core
Mobile packet core engineer who designs, builds, and automates 4G/5G core network functions (AMF, SMF, MME, SGSN, ePDG) on a live national multi-vendor network (~15M concurrent sessions). Delivers new cloud-native builds and migrations in-house, leads multi-vendor root-cause analysis, and executes zero-impact changes at carrier scale.
Vancouver / Langley, BC, CanadaCanadian Citizen · TN Visa Eligible (US Roles)Open to Relocation
Designed for resilience
~15MConcurrent subscriber sessions (14.4M 4G + 0.8M 5G SA)
~80 NodesProduction core network elements across 7 core sites
130–140/yrLive production changes with a sustained zero-impact streak
37 AwardsCompany-wide recognitions (2022–2026), incl. 3 top-tier awards
Evidence, not just expertiseEngineering outcomes
Engineering outcomes
that speak for themselves.
Quantified production engineering, migration, root-cause analysis, and automation outcomes delivered across a live national Tier-1 mobile core.
Est. vendor fee avoided / node
Delivered a new Ericsson 5G/4G AMF/MME core node end-to-end in-house on OpenShift ($150K–$350K est. professional services avoided per build).
Core alarm ticket reduction
Designed an AI-assisted alarm-consolidation method and drove vendor config changes that cut total Packet Core ticket volume by ~70%.
Handover rejects eliminated
Isolated multi-vendor P-GW/SMF defects via frame-level trace analysis, cutting VoWiFi-to-LTE failures ~45% and daily SMF handover rejects ~51%.
Dollar and hour savings reflect engineering planning estimates. Bar lengths provide visual emphasis across distinct initiatives.
Resume highlights
Download full resume ↓
The experience behind the results.
A concise overview of 20+ years across IT and telecommunications, including 9+ years of hands-on packet core engineering and DevOps delivery.
Current Role · TELUS · Nov 2017 – Present · Vancouver, BC
DevOps / Wireless Core Engineer, Packet Core
Design, build, integrate, and operate 4G/5G core network functions (AMF, SMF, MME, SGSN, S/PGW, ePDG) across ~80 production nodes at 7 national core sites carrying ~15M concurrent sessions.
- In-house cloud-native 5G/4G builds: Initiated and delivered a brand-new Ericsson AMF/MME node end-to-end on OpenShift (16 workers, CIQ design, VLAN/IP, vendor support sign-off, RFS & traffic onload), avoiding an estimated $150K–$350K in vendor professional services per node.
- Fleet-scale migrations & capacity scaling: Owner of planning, MOPs, and execution for retiring the 9-node Cisco ASR5500 MME fleet (~5.7M subscribers offloaded with zero impact); organized 6 maintenance windows in 3 weeks scaling all consumer Ericsson SMFs to 6M sessions across 7 sites.
- National root-cause analysis & vendor ownership: Standing owner of the Cisco StarOS control-plane TAC channel; isolated a VoWiFi-to-LTE P-GW defect (~250K subs/day impacted) cutting national handover failures ~45%, and proved an SMF handover cause via frame-level trace analysis cutting daily rejects ~51%.
- DevOps pipelines & AI operations: Led the self-service Cisco-to-Ericsson IMSI migration tool (Python, Jenkins, GCP Cloud Run, Apps Script; ~116h est. saved per pass), built daily RADKit/Janus health checks across 34 nodes, created a 7-layer self-checking MOP Factory, and reduced core ticket volume ~70%.
- Zero-impact change execution & security: Executed ~130–140 live production changes/year with a sustained zero-customer-impact streak; led Lawful-Intercept IPSec encryption across 10 MMEs and 26 SPGW elements at 8 sites, and authored 300+ team-standard MOPs and runbooks.
- Agile leadership & cross-team enablement: Served ~3 years as Agile Team Facilitator alongside core engineering; enabled 5 partner teams (roaming, service integrity, DevOps build, automation, voice) to operate independently through playbooks and automation.
Earlier career & awards
Telecommunication Specialist · TELUS2011–2017 · Lower Mainland, BC · Field/CSD switching, transport, IP/data fault isolation & escalations
Customer Systems Engineer · WideZone2004–2010 · Supported 600+ desktops, 50+ Linux/Windows servers, 700+ users, TCP/IP, DNS, DHCP & network design
Recognition: Received 37 company-wide Bravo awards (2022–2026) from 24 peers, managers, and Directors, including three top-tier 10,000-pt individual awards.
Technical toolkit
5G SA / LTE EPCAMF · SMF · UPF · MMEEricsson 5GC · Cisco StarOSOpenShift · KubernetesOpenStackPython · Scapy · BashGitLab CI/CD · Jenkins · AnsibleGCP Cloud Run · SplunkGTPv2 · Diameter · SCTP · BGPInfoblox DNS · RADKit
Education & certifications
Bachelor of Computer Science & MathematicsKamchatka State University · 1998–2003 (Post-grad Economics & Mgmt, 2003–2006)
Applied Network Admin & Design · CCNA CourseworkBCIT, Vancouver · 2010–2011 & 2019–2020
5G Core Architecture · Red Hat OpenStack AdminMpirical (2021) · Red Hat (2019) · Python Data Automation (2021)
Certified Scrum Product Owner (CSPO) & ICAgileScrum Alliance (2021) · ICAgile Team Facilitation & Coaching (2023)
Full project inventory, protocol interfaces, and career history are included in the downloadable resume.
Discuss a role with Sergey ↗Selected engineering workFrom design decisions
From design decisions
to live-network delivery.
Four flagship initiatives demonstrating in-house cloud-native builds, national fleet migrations, protocol-level root-cause analysis, and DevOps automation.
Hover over a card to reveal the engineering details. On mobile, tap to flip; tap again to return.
Engineering mindset
Built for systems that cannot afford surprises.
Sergey combines deep 4G/5G packet-core expertise with operational discipline and practical automation to deliver resilient carrier infrastructure. His work spans end-to-end cloud-native builds, L3/firewall reference architecture, frame-level protocol diagnostics, and vendor TAC escalation ownership.
Beyond hands-on execution, he builds the methods, self-service pipelines, and playbooks that leave partner teams independent—backed by 300+ authored MOPs, a 1,821-parameter AMF configuration standard, and 37 company-wide awards.
Ericsson 5GC · Cisco StarOS · AffirmedOpenShift · Kubernetes · OpenStackPython · GitLab CI/CD · Jenkins · GCP
Career
Experience across the network lifecycle.
More than 20 years across IT and telecommunications, progressing from enterprise systems and field infrastructure into national wireless packet-core engineering.
DevOps / Wireless Core Engineer, Packet Core · TELUS
Design, build, migrate, and operate 4G/5G core network functions (AMF, SMF, MME, SGSN, S/PGW, ePDG) across ~80 production nodes at 7 core sites (~15M concurrent sessions). Standing owner of Cisco StarOS control-plane TAC channel, production change owner (~130–140 changes/year with zero impact), ePDG and 911 SME, and Agile Team Facilitator (Sep 2022–2025).
Telecommunication Specialist · TELUS
Field and Customer Service Delivery technician installing, provisioning, and repairing IPTV, DSL, and voice services. Handled urgent escalations, fault isolation across switching, transport, broadcast, and data/IP circuits, and earned a self-driven move into the wireless packet core on-call rotation in Nov 2017.
Customer Systems Engineer · WideZone
Supported 600+ desktops, 50+ Windows and Linux servers, 50 VPN users, and 700+ end users. Configured TCP/IP, DHCP, DNS, WINS, directory services, and security; managed infrastructure rollouts with ~90% release acceptance.
Technical breadth
Specialist depth. Operational range.
5G
Packet core & signaling
AMF, SMF, UPF, NRF, NSSF, MME, SGW, PGW, SGSN, ePDG, PCRF/PCF; GTPv1/v2, Diameter, SCTP, S1-AP, NAS, HTTP/2 SBI, VoLTE, VoWiFi, VoNR, E911, Lawful Intercept.
☁
Cloud-native & IP infra
Red Hat OpenShift, Kubernetes, OpenStack, VMware ESXi, KVM, Docker, GCP (Cloud Run); BGP, OSPF, BFD, IPSec, IPv4/IPv6 dual-stack, Infoblox DNS (S-NAPTR).
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Automation, observability & Agile
Python (incl. Scapy), Bash/expect, GitLab CI/CD, Jenkins, Ansible, Apps Script, Cisco RADKit/Janus, Splunk, GCP/Prometheus, NetScout, PCAP/coredump RCA.
Recruiters & hiring managers
Let's discuss the engineering problem you need solved.
Available for roles in 4G/5G packet core, cloud-native telecom infrastructure, network DevOps, and reliability engineering across Canada and the United States (Canadian Citizen, TN Visa eligible).
levitskys@gmail.com ↗