David Navarro

Summary

Senior telecommunications engineer with a strong track record in leading cloud-native M2M/IoT and VoLTE network solutions. Delivered projects ahead of schedule and under budget, significantly reducing Sev-1 outages and improving network performance through effective design and integration strategies.

Overview

29

years of professional experience

Work History

Senior Systems Engineer

T-Mobile

07.2025 - 03.2026

Supported S1 Rehome and MOCN/RMOCN network integration projects for the US Cellular to T-Mobile network transition, including deployment support, verification testing, and cross-team coordination.
Developed Carrier Security Gx SNMP KPI monitoring through NMS tools on Checkpoint firewalls and built real-time SevOne observability dashboards to identify GTP security attack indicators, roaming partner exposure, and network performance trends.
Business unit: Systems Architecture -Packet Core Engineering.

Senior Mobile Core Engineer

US Cellular Corporation

Schaumburg, USA

04.2012 - 06.2025

Led solutions as an end-to-end engineer for large cloud-native M2M/IoT vEPC and VoLTE/IMS/LTE PCRF rollouts across regional carrier networks, managing solution design, integration, deployment, and lifecycle management while defining low-level designs and system workflows.
Owned full lifecycle delivery (LLD, testing, deployment, and operational handoff) for VoLTE/IMS/E911/WPS/LTE/5G and vEPC cloud-native projects, completing ahead of schedule and within/under budget by designing end-to-end integrations and validating correctness under production-like load conditions.
Developed and automated V&V-style verification for distributed network functions using Spirent capacity, load, performance, and stress testing with MME/DRA nodal scripts; documented test results and readiness findings for operations teams and leadership to facilitate informed decision-making.
Directed major service engineering projects as the lead solutions engineer, focusing on VoLTE and LTE Data PCRF rollout and network expansion.
Led complete Low-level design, testing and deployment for the VoLTE and LTE PCRF project.
Implemented end-to-end design and integration for US Cellular’s 4G VoLTE/LTE, M2M/IoT core network, validating functionality and performance through Spirent LS tools to ensure reliability and readiness for production rollout.
Implemented Grafana dashboards for observability and KPI tracking.
Wireless Network Core Engineer responsible for US cellular Wireless Service Provider Carrier 3G CDMA, GPRS and 4G LTE EPC/5G OPT 3x Core Network.
Led integration and deployment of Nokia HP C7000 HSS-SPR systems, developing integration MoPs and low-level designs.
Scope of work consists of leading new engineering projects with a focus on technical or technological enhancement, hardware platform upgrades.
System integration engineering through low level design and development, automation scripts development, testing, network rollout and deployment.
Created and maintained system design documentation, low-level designs, configuration MoPs, and deployment procedures to ensure comprehensive support for integration testing, production rollout, and operational handoff.
CI/CD: Acceptance testing planning, V&V test planning, Initial Lab ATP testing through production cutover end to end, Alarm /SNMP/Hardware Redundancy testing and system load testing script development.
PoC (proof of concept) M2M/IoT and Enterprise Wireless solutions working in collaboration with lead telecom architects.
Served as technical lead for key projects such as LTE prepaid, throttling, Supporting and Deploying Business Verticals / M2M/NB IoT connectivity solutions, and LTE EPC/ 5GC and NSA Option 3X and VoLTE Core Network low level design and production rollout.
Led Mobile Core Engineer for LTE/ IMS charging systems engineering.
Delivered knowledge transfer presentations to Senior leadership, NOC, cross functional teams, operations engineers, enhancing understanding of implemented solutions.
Infrastructure automation: Developed network automations using scripts (bash,and python).
Participated in the deployment and testing of the US Cellular VoLTE network trial.

Wireless Charging System Application Developer

US Cellular Corporation

Chicago, USA

05.2005 - 04.2012

Executed wireless application software testing, system analysis, and design; oversaw deployment and technical trial development while managing project timelines and performance capacity planning to ensure successful project delivery.
Directed project initiatives, providing technical leadership to enhance collaboration and streamline processes across multiple wireless technical projects.
Developed automation unit, system performance test generators, and regression test suite tools for charging system testing, emulating wireless data services application logic to validate compliance with technical requirements.
Black Box (boundary value, decision tables, state/transition) unit and regression testing of packet based wireless data charging software for system application validation of output Call Detail Records produced for Wireless Service Provider data services.
Developed system validation test suite for data mining call detail records using SQL in Oracle/Linux environment, ensuring accurate data output for compliance and performance analysis.
Business Unit: IS Back Office Development, Provisioning and Data Collection Group.

Engineering Associate III

3COM Co. /COMMWORKS Corp.

Rolling Meadows, USA

12.2000 - 11.2002

Engineered development tests, diagnosed embedded hardware faults, and conducted integration testing and troubleshooting of VoIP network element hardware and software interface for CMTS carrier-grade equipment within a matrix team environment.
Supported system integration and unit testing for Carrier Grade VoIP platform, ensuring alignment with project requirements.
Conducted systems integration testing and troubleshooting of switch mode power supplies and onboard power management circuits for Carrier Grade VoIP telephony system cards.

Engineering Lab Technician

Philips/ Advance Transformer Co.

Rosemont, USA

04.1997 - 12.2000

Troubleshot electronic ballast and switch mode power supplies at the component level to resolve performance issues.
Modified electronic ballast designs for passive and active component qualification tests to enhance reliability.
Performance and application testing of electronic ballast circuits.
Conducted DC characterization of electronic components, evaluating performance and ensuring compliance with specifications.
Knowledge of Oscilloscopes, Curve Tracer, High voltage testing equipment, Magnetic/Transformer component testing.

Education

Industrial IoT Graduate Certificate Program -

University of Colorado

12-2026

B.S. - Electrical Engineering

ILLINOIS INSTITUTE OF TECHNOLOGY

Wimax Forum Certified RF Network Engineer -

WFRE #438

PL 501 VOIP Graduate Certificate Program -

ILLINOIS INSTITUTE of TECHNOLOGY

PL 599 Advanced VoIP Development -

ILLINOIS INSTITUTE of TECHNOLOGY

Skills

Network security
Network automation
Network traffic analysis
Network protocols standards
Routing and switching
VPN configuration techniques
Cloud infrastructure design
IOT protocols
Container orchestration

Network Monitoring/Telemetry/UML/Analysis tools
Observability solutions
Testing and troubleshooting
KPI dashboard solutions
Systems integration
Project management
Telecommunications engineering
Network Monitoring/Telemetry/UML/Analysis tools

Websites

https://www.linkedin.com/in/david%2Dnavarro%2Djr%2Db5a2a2415/

Network Protocol And Industry Standards - Platform Knowledge

5GSA and LTE EPC 3GPP Standards: 23.401 /24.301, 29.272, 29.272
Policy Charging Control: 212/29.213, Charging: 32.251, 29.299
IOT protocols: MQTT, Bluetooth, Zigbee
Routing and switching: MPLS, OSPF, BGP, 802.1Q, STP, RSTP, HSRP.
Interfaces and Aggregation: 1 G, 10 G, Ethernet, and Fiber Optic, LACP, LAG
Tunneling Protocols: L2TP, IP-n-IP, VPN, and GRE.
Operating and Virtual Systems: Redhat and Suse /Ubuntu Linux, VMWARE, Kubernetes.
Hardware/Telecomm Platforms: ATCA, HP C7000, Nokia 7750 SR OS products, Cloud based MME, Openstack based virtual MME, CMG (SAEGW), Cisco UCS, Oracle DRA, DSR, Mobileum GTP Proxy
Observability /OSS Solutions: Grafana/Prometheus/Loki, Splunk, Nokia NetAct/NSP
Network Monitoring/Telemetry/UML/Analysis tools: NetScout (nSA, NBA, nGenius), Tableau/SevOne, Lucid charts, Wireshark Protocol PCAP Analysis

Timeline

Senior Systems Engineer - T-Mobile

07.2025 - 03.2026

Senior Mobile Core Engineer - US Cellular Corporation

04.2012 - 06.2025

Wireless Charging System Application Developer - US Cellular Corporation

05.2005 - 04.2012

Engineering Associate III - 3COM Co. /COMMWORKS Corp.

12.2000 - 11.2002

Engineering Lab Technician - Philips/ Advance Transformer Co.

04.1997 - 12.2000

University of Colorado - Industrial IoT Graduate Certificate Program,

ILLINOIS INSTITUTE OF TECHNOLOGY - B.S., Electrical Engineering

- Wimax Forum Certified RF Network Engineer,

ILLINOIS INSTITUTE of TECHNOLOGY - PL 501 VOIP Graduate Certificate Program,

ILLINOIS INSTITUTE of TECHNOLOGY - PL 599 Advanced VoIP Development,