Network Infrastructure Engineer - Remote

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

Descripción de la vacante

A software development company in Madrid is seeking ultra-low-latency networking engineers proficient in C / C++. Responsibilities include designing high-performance packet I/O pipelines and tuning Linux servers. The ideal candidate has excellent problem-solving skills, strong knowledge of Linux, and great English communication. This is a full-time position offering a competitive salary, benefits, and flexible working hours.

Servicios

Competitive salary

Benefits including learning opportunities

Flexible working hours

Formación

• Experience with high-frequency trading or fintech environments.
• Strong knowledge of Linux performance tuning and NIC hardware features.

Responsabilidades

• Design and implement high-performance packet I/O pipelines.
• Configure and tune Linux servers for ultra-low latency.
• Stay current with networking trends and evaluate trade-offs.

Conocimientos

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

Strong problem-solving and debugging skills

Excellent English communication skills

Herramientas

Linux tuning tools (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.