Remote Senior Infrastructure Engineer

Cactus; Madrid; A distancia; EUR 60.000 - 90.000; Jornada completa

Descripción de la vacante

A leading software development company in Madrid is seeking a high-frequency trading networking engineer specialized in C/C++. The role involves designing high-performance packet I/O pipelines and configuring Linux servers for ultra-low latency. Excellent English communication and strong problem-solving skills are essential. This full-time position offers a competitive salary and benefits, including flexible working hours and learning opportunities.

Servicios

Competitive salary

Flexible working hours

Learning opportunities

Formación

• Expert in C/C++ for performance-critical networking.
• Strong knowledge of Linux tuning and NIC hardware features.
• Experience with packet capture and analysis tools.

Responsabilidades

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

Conocimientos

Performance-critical networking code expertise

Linux performance tuning

English communication skills

Problem-solving and debugging

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.