Network Engineer - Remote

Cactus; Madrid; A distancia; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A top software development firm in Madrid is seeking an experienced network engineer to design and implement high-performance packet I/O pipelines. This full-time role requires expertise in C/C++ and strong Linux tuning knowledge, with flexible working hours and a competitive salary package. Strong English communication skills are essential. Join a dynamic team focused on delivering cutting-edge networking solutions.

Servicios

Competitive salary

Flexible working hours

Learning opportunities

Formación

• Experience with configuring and tuning Linux servers for ultra-low latency.
• Ability to evaluate trade-offs in networking trends.
• Strong problem-solving and debugging skills at the network + OS boundary.

Responsabilidades

• Design and implement high-performance packet I / O pipelines.
• Configure Linux servers for optimal networking performance.
• Stay current with networking trends and tools.

Conocimientos

Expert C / C++ in performance-critical networking code

Strong knowledge of Linux performance tuning

Excellent English communication skills

Herramientas

tcpdump

Wireshark

perf

Descripción del empleo

Cactus is a software development company, providing full-cycle services for the European market. More than 170 companies increased business productivity using solutions developed by Cactus experts. The company has been regularly included in the listings of the best software development companies in Belgium and Europe.

Design and implement high-performance packet I / O pipelines using DPDK or equivalent frameworks.

Configure and tune Linux servers for ultra-low latency : hugepages, NUMA awareness, CPU pinning, NIC driver binding, RSS / flow steering.

Stay current with RDMA and user-space networking trends (DPDK, netmap, AF_XDP, eBPF / XDP) to evaluate trade-offs.

Expert C / C++ in performance-critical networking code.

Strong knowledge of Linux performance tuning and NIC hardware features (RSS, flow steering, checksum / jumbo offloads).

Experience with packet capture / analysis tools (tcpdump, Wireshark, perf).

Strong problem-solving and debugging skills at the network + OS boundary.

Excellent English communication skills – written and spoken.

• High-frequency trading (HFT) / fintech — ultra-low-latency networking engineers.

Network security & DPI appliances — intrusion detection / firewall data plane developers.

CDN / video streaming / media transport — high-performance transport engineers.

HPC / storage networking — experience with RDMA, NVMe-oF, or cluster interconnects.

Full-time position with a competitive salary and benefits, including learning opportunities.

Flexible working hours.