Network Engineer (4G/5G Core Network)

Position Overview

We are seeking an experienced Network Engineer(s) with strong expertise in 4G/5G core networking technologies to support testing, deployment, optimization, and upgrade activities in a complex telecommunications environment. This is a long-term consulting engagement requiring collaboration with engineering teams, participation in network testing initiatives, production deployment support, and network design consultations.

The ideal candidate will possess deep knowledge of 4G/5G core technologies, cloud-native networking, network virtualization, and advanced routing protocols. The engineer will work PST business hours and partner closely with

project stakeholders to ensure successful delivery and operational excellence. Candidate must also be available to travel to the US once per quarter.
Location

- LATAM (Remote): Brazil, Costa Rica, Argentina, and Mexico (in that order of preference).

- Must be able to work Pacific Standard Time business hours.

About Us:

Abstra is a fast-growing, Nearshore Tech Talent services company, providing top Latin American tech talent to U.S. companies and beyond. Founded by U.S.-bred engineers with over 15 years of experience, Abstra specializes in sourcing skilled professionals across a wide range of technologies to meet our clients’ needs, driving innovation and efficiency.
Key Responsibilities

- Support lab and production testing activities for core network technologies.

- Execute and document network testing plans, reporting findings and recommendations.

- Participate in customer and stakeholder meetings to understand testing objectives and operational requirements.

- Design and implement lab upgrades, network enhancements, and new feature deployments.

- Develop migration guides and support lab-to-production transition activities.

- Provide technical consultation on network architecture, scalability, resiliency, performance, and Quality of Service (QoS).

- Support network change management activities, including impact analysis and implementation reviews.

- Assist with troubleshooting and production deployment support during major network changes.

- Participate in recurring technical meetings and service reviews.

- Create and maintain technical documentation, test reports, migration guides, and operational deliverables.

- Provide knowledge transfer and informal technical training when required.

Required Technical Skills
4G/5G Wireless & Core Network Expertise

- Deep understanding of 4G and 5G technologies.

- Strong knowledge of:
- 3GPP / 3GPP2 standards

- 5G Standalone (SA) and Non-Standalone (NSA) architectures

- Service-Based Architecture (SBA)

- Service Mesh

- Network Functions:
- AMF

- SMF

- UPF

- PCF

- Network slicing

- VPP

- Data modeling techniques including fragmentation, peer-to-peer (P2P), and content filtering.

Cloud-Native & Virtualization

- Network Function Virtualization Infrastructure (NFVI).

- Virtualization technologies.

- Cloud-native networking deployments.

- Hands-on experience with:
- Kubernetes

- Docker

- OpenShift

- Microservices architectures.

Networking Fundamentals

Strong Layer 2 and Layer 3 networking experience, including:

- BGP

- BFD

- IS-IS

- OSPF

- Static routing.

Automation & Systems Engineering

- Network test automation experience.

- Python 3 development/scripting.

- Unix/Linux administration.

- Shell scripting.

- Performance testing and scaling expertise.

- System engineering experience.

- Understanding of telecom call models and network performance optimization.

Preferred Qualifications

- Experience supporting large-scale telecommunications or service provider environments.

- Experience with network migrations and production deployment support.

- Strong documentation and communication skills.

- Experience working directly with engineering, operations, and customer-facing teams.

- Prior experience supporting 5G core network deployments and troubleshooting.

Candidate Profi