Network Engineer Technical Project

Diego J. Rojas

**** *********** *******, *** *** Montgomery Village, MD 20886

240-***-**** *****.*******@*****.***

Professional Profile

Telecom Network engineer with over 14 years of experience in designing, deploying, and maintaining high-performance network infrastructure, I specialize in large-scale environments, including data centers and Cellular Switch Centers (CSCs) as part of a global Point of Presence (POP) for a leading cellular operator supporting 30+ million subscribers. Experience in medium data network design, technical project leadership, and mission-critical infrastructure maintenance. I have background in Cellular Core Networks (CS, PS, & EPC) and Value-Added Services (VAS), along with first-level support for transport networks (SDH, DWDM, Satellite). I have successfully managed Mobile Switching Centers (MSCs) across multiple regions, ensuring high availability, scalability, and seamless integration with vendor ecosystems. Proficient in technologies from Cisco, Nokia, Huawei, Juniper, and Check Point, I collaborate effectively with cross-functional teams to optimize commercial network performance and reliability.

Skills

Networking & Protocols: LAN/WAN, TCP/IP, Ethernet, VLANs, STP, EtherChannel, OSPF, DHCP, DNS, routing, and switching.

Network Security: Firewalls (Check Point R75, Cisco ASA IOS 9.16), remote access VPNs.

Network Monitoring & Management: PRTG, Zabbix, Nagios, SolarWinds (Orion Network Atlas), SNMPv3, packet analysis (Wireshark, Tcpdump).

Data Center Technologies: Space, power, cooling, structured cabling, and connectivity audits; AC/DC power concepts; fiber optics.

Virtualization & IT Infrastructure: VMware, Hyper-V, Dell Servers, Huawei E9000, iDrac, Windows Server, Linux

(CentOS, RedHat, Ubuntu).

Cellular Core Networks & O&M: HLR/HSS, MSS/MME, MGW, SGSN/GGSN, STP, SGW/PGW, BSCs, RNCs, VAS (VMS, SMSC, USSD), EPC Core, NetAct/u2000.

Work Experience

Network Lab Manager

Graphical Networks LLC, Gaithersburg, MD 2021 – 2024

Designed and implemented network infrastructure in both virtual and on-premises environments across core, distribution, and access layers.

Developed and documented network solutions aligned with NetTerrain, the company’s telecom infrastructure inventory management software.

Trainer Engineer

E&S - Engineering and Services, Bogotá, Colombia 2016 – 2017

Designed, prepared, and delivered technical training for mobile network operators in Latin America and the Caribbean on RAN, Core CS/PS/EPC, and LTE (VoLTE) using Nokia and Huawei technologies. Operation and Maintenance Engineer

América Móvil – Claro, Bogotá, Colombia 2010 – 2016

Conducted preventive and corrective maintenance on Core Network Elements, Cellular Controllers, Backbone IP, and VAS platforms.

Managed firewall rules and policies (Check Point) and administered Mobile Switching Centers (MSCs), including data center and IT infrastructure.

Provided first-tier on-site support for transmission equipment (Microwave, SDH, DWDM, and Satellite). Cellular Network Implementation Technician

América Móvil – Claro, Bogotá, Colombia 2007 – 2010

Commissioned and integrated 2G and 3G base stations, ensuring compliance with company standards.

Conducted integration and acceptance testing for 3G sites (Node B) in urban and rural areas.

Expanded 2G and 3G base stations based on RF department requirements. Junior Support Engineer

Globalcom, Bogotá, Colombia 2006 – 2007

Communications Technician (Internship)

Ministry of Communications, Bogotá, Colombia 2004

Conducted technical studies for the installation, renovation, and expansion of telecommunications networks.

Monitored the radioelectric spectrum and performed analysis for operating licenses. Education

Bachelor's Degree in Electrical Engineering – Universidad ECCI, Bogotá, Colombia (2009)

AA in Cloud Computing and Networking Technology – Montgomery College, Rockville, MD (2022) Certifications & Training

EPC Principle Fundamental Training – Huawei (2017)

One-NDS, HSS & NT-HLR – Nokia (2016)

SMS Gateway – Huawei (2015)

EPC Principle Commissioning Training – Huawei (2014)

LTE Signaling Release FD-LTE RL40 – Nokia (2014)

Interconnecting Cisco Networking Devices (ICND1 & ICND2) – Cisco (2013)

Leadership for Teamwork – Universidad de la Sabana (2012)

NetAct OSS5.3 UTRAN Configuration Management – Nokia (2012)

O&M NEC MS5000 System – NEC (2011)

2G Switching Core Network O&M – Nokia (2011)

TK-900 IAS Next Generation User Operations – Tekelec (2010)

CCSE Check Point II R70 – Check Point (2010)

CCSA Check Point Security Administration R70 – Check Point (2010)

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