Senior Network Engineer

KSTACK; São Paulo; Hybrid; BRL 180,000 - 300,000; Full time

Job summary

KSTACK is seeking an L3 Network Engineer in Brazil to deliver advanced production support for enterprise LAN/WAN and data center networks. You will troubleshoot complex incidents, perform RCAs, and contribute to capacity planning and documentation in a fast-paced environment.

The role requires hands-on experience with Cisco/Juniper gear, SD-WAN, F5 load balancers, Palo Alto firewalls, and VPNs, along with strong routing protocol knowledge (BGP, OSPF, EIGRP).

Qualifications

• / Hands-on experience providing advanced production support, complex incident resolution, and problem management.
• / Experience designing, implementing, supporting, and troubleshooting enterprise LAN, WAN, SD-WAN, wireless, and data center networks.
• / Strong knowledge of BGP, OSPF, EIGRP, MPLS, VLANs, and STP.
• / Experience with firewalls, VPNs, load balancers, and network security.
• / Experience leading network upgrades, migrations, change management, and disaster recovery procedures.
• / Ability to perform detailed RCA and maintain network documentation, SOPs, and diagrams.
• / Ability to coordinate and manage network-related projects.

Skills

L3 Network Support & Troubleshooting

Cisco & Juniper Networking

Routing & Switching

SD-WAN

Palo Alto Firewalls & VPNs

F5 Load Balancers

LAN/WAN & Data Center Networking

Network Security

Root Cause Analysis (RCA) & Perf.

Network Upgrades, Migrations & DR

Project Management

English Proficiency

Tools

Cisco Networking hardware

Juniper Networking hardware

Palo Alto Networks devices

F5 BIG-IP

SD-WAN platforms

Job description

Position Overview

We are seeking a highly skilled L3 Network Engineer with hands-on experience providing advanced production support, resolving complex network incidents, managing recurring issues, and conducting root cause analysis (RCA).

The ideal candidate will have extensive expertise in designing, implementing, supporting, and troubleshooting enterprise LAN, WAN, SD-WAN, wireless (Wi-Fi), and data center networks, with strong technical proficiency in Cisco, Juniper, Palo Alto Networks, and F5 technologies.

A solid understanding of routing and switching protocols, including BGP, OSPF, EIGRP, MPLS, VLANs, and Spanning Tree Protocol (STP), is essential.

This role also requires hands-on experience with firewalls, VPNs, load balancers, network security, performance tuning, and capacity planning. Candidates should have experience leading network upgrades, migrations, change management activities, and disaster recovery (DR) initiatives.

The successful candidate must be able to perform detailed root cause analyses and maintain accurate network documentation, standard operating procedures (SOPs), and network architecture diagrams.

Required Technical Skills

• L3 Network Support & Troubleshooting: Advanced production support, complex incident resolution, and problem management.

• Cisco & Juniper Networking: Strong hands-on experience with enterprise networking technologies.

• Routing & Switching: In-depth knowledge of BGP, OSPF, EIGRP, MPLS, VLANs, and STP.

• SD-WAN: Experience supporting and troubleshooting SD-WAN environments.

• Palo Alto Firewalls & VPNs: Hands-on experience with firewall administration, VPN connectivity, and troubleshooting.

• F5 Load Balancers: Experience managing and troubleshooting F5 load-balancing solutions.

• LAN/WAN & Data Center Networking: Design, implementation, maintenance, and troubleshooting of enterprise network infrastructure.

• Network Security: Strong understanding of network security technologies and best practices.

• Root Cause Analysis (RCA) & Performance Optimization: Ability to identify underlying issues, optimize network performance, and support capacity planning.

• Network Upgrades, Migrations & Disaster Recovery: Experience planning and executing network upgrades, infrastructure migrations, change activities, and disaster recovery procedures.

• Project Management: Ability to coordinate and manage network-related projects and technical initiatives.

Language Requirements

Advanced English proficiency is required, including the ability to communicate effectively in professional and technical environments.