Join a high-performing infrastructure engineering team responsible for designing, building and supporting the mission-critical platforms that power global electronic trading. This team operates at the heart of a highly regulated, performance-sensitive environment where reliability, security and low latency are fundamental. This is a hands-on engineering role combining deep Linux systems expertise with advanced networking knowledge. You'll work across physical data centres, low-latency infrastructure and automation, collaborating with software engineers, platform teams and production support to continuously improve performance, resilience and operational excellence. If you enjoy solving complex infrastructure problems, tuning Linux for maximum performance and building highly automated environments, this is an opportunity to work on some of the most technically demanding systems in the industry. The Role As a Senior Network & Linux Infrastructure Engineer, you'll be responsible for the design, deployment and operational support of large-scale on-premises infrastructure supporting business-critical trading applications. You'll work across Linux, enterprise networking, automation and observability, ensuring infrastructure remains secure, resilient and optimised for high-performance workloads. This role combines project delivery with production engineering, giving you the opportunity to build new infrastructure while acting as an escalation point for complex technical issues. What Makes This Role Different This is not a traditional infrastructure support position. You'll be engineering the platforms that underpin some of the most demanding production environments, where performance, resilience and automation are critical. You'll work across Linux, networking and infrastructure engineering, helping shape the next generation of highly available, low-latency platforms while solving complex technical challenges every day. If you're passionate about Linux, networking and building resilient infrastructure at scale, this role offers an outstanding opportunity to work alongside highly experienced engineers using modern technologies in a fast-paced engineering environment. Essential functions Responsibilities Design, deploy and maintain enterprise Linux infrastructure supporting mission-critical applications. Build and support high-performance network environments across multiple data centres. Configure and maintain routing, switching and multicast networking infrastructure. Optimise Linux systems through kernel tuning, CPU affinity, memory optimisation and network stack configuration. Engineer resilient, highly available infrastructure with a focus on performance and reliability. Automate infrastructure provisioning, configuration management and operational workflows using scripting and Infrastructure as Code principles. Provide L3 production support for complex infrastructure issues and major incidents. Perform root cause analysis and implement permanent improvements to reduce operational risk. Execute infrastructure upgrades and change activities through controlled change management processes. Work closely with software engineering teams to optimise application performance on Linux platforms. Implement monitoring, alerting and observability across Linux, networking and infrastructure services. Ensure infrastructure complies with security standards, governance and operational best practice. Contribute to capacity planning, disaster recovery and infrastructure lifecycle management. Document infrastructure designs, operational procedures and technical standards. Qualifications What We're Looking For Essential Skills 5+ years' experience supporting enterprise Linux infrastructure. Strong Linux administration experience within production environments. Excellent understanding of Linux internals, kernel behaviour and operating system performance. Strong networking expertise across TCP/IP, routing and switching. Experience configuring and supporting enterprise network infrastructure. Hands-on experience with Cisco and/or Arista networking technologies. Strong understanding of multicast networking including IGMP and PIM. Experience supporting physical data centre infrastructure. Strong scripting skills using Python, Bash or Go. Experience automating infrastructure and operational processes. Hands-on experience with monitoring and observability platforms including Prometheus, Grafana, Splunk or ELK. Experience performing root cause analysis and resolving complex production issues. Strong understanding of change management within critical production environments. Would be a plus Desirable Experience Low-latency infrastructure or electronic trading environments. Linux performance optimisation and kernel tuning. Kernel bypass technologies including Solarflare OpenOnload or DPDK. Infrastructure security, hardening and compliance. High-performance networking. Container platforms including Kubernetes. Infrastructure as Code and configuration management. Storage and compute infrastructure. Performance analysis using packet capture and network diagnostics. Experience supporting business-critical financial systems. We offer Opportunity to work on bleeding-edge projects Work with a highly motivated and dedicated team Competitive salary Flexible schedule Benefits package - medical insurance, sports Corporate social events Professional development opportunities Well-equipped office About us Grid Dynamics (

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GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in , supported by profound expertise and ongoing investment in , , , and . Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.