David Navarro
Downers Grove,USA
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
29
years of professional experience
Work History
Senior Systems Engineer
T-Mobile
08.2025 - 04.2026
- 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
05.2012 - 07.2025
- 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
06.2005 - 05.2012
- 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
01.2001 - 12.2002
- 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
05.1997 - 01.2001
- 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
Boulder, CO12-2026
B.S. - Electrical Engineering
ILLINOIS INSTITUTE OF TECHNOLOGY
IL, USAWimax Forum Certified RF Network Engineer -
PL 501 VOIP Graduate Certificate Program -
ILLINOIS INSTITUTE of TECHNOLOGY
IL, USAPL 599 Advanced VoIP Development -
ILLINOIS INSTITUTE of TECHNOLOGY
IL, USASkills
- 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
Timeline
Senior Systems Engineer
T-Mobile
08.2025 - 04.2026
Senior Mobile Core Engineer
US Cellular Corporation
05.2012 - 07.2025
Wireless Charging System Application Developer
US Cellular Corporation
06.2005 - 05.2012
Engineering Associate III
3COM Co. /COMMWORKS Corp.
01.2001 - 12.2002
Engineering Lab Technician
Philips/ Advance Transformer Co.
05.1997 - 01.2001
Industrial IoT Graduate Certificate Program -
University of Colorado
B.S. - Electrical Engineering
ILLINOIS INSTITUTE OF TECHNOLOGY
Wimax Forum Certified RF Network Engineer -
PL 501 VOIP Graduate Certificate Program -
ILLINOIS INSTITUTE of TECHNOLOGY
PL 599 Advanced VoIP Development -
ILLINOIS INSTITUTE of TECHNOLOGY
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