RDMA Performance Engineer

CodiLime

. Configure, troubleshoot, and maintain NVIDIA/Mellanox Spectrum switches and ConnectX Network Interface Cards (NICs) .

Posted 10/1/2026contractRemote • PolandSeniorLead💰 PLN 22,000 - PLN 30,000 per monthWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in network engineering with a focus on data center network design and architecture, including hands-on configuration of NVIDIA/Mellanox Spectrum switches and ConnectX NICs. Proficient in optimizing network environments for AI workloads and conducting performance benchmarking using RDMA and NCCL.

Highest-signal resume keywords

Network EngineeringData Center Network DesignNVIDIA/Mellanox Spectrum SwitchesPerformance BenchmarkingNetwork Automation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

BGPEVPN/VXLANLACPECMPRoCEv2Priority-Based Flow ControlExplicit Congestion NotificationQuality of ServiceRDMANVIDIA Collective Communication Library

Soft Skills

Technical DocumentationProfessional English Communication

Tools & Technologies

PyATSNAPALMBatfishNornirNetBoxGitLab CIGitHub ActionsJenkins

Certifications & Qualifications

CCNPCCIE EnterpriseCCIE Data CenterJNCIP

Industry Keywords

AI WorkloadsCongestion Control MechanismsAgile Project TeamRail-Optimized DesignRail-Unified Design

Tech Stack

Tools & technologies

Jenkins

About the role

Key responsibilities & impact

Configure, troubleshoot, and maintain NVIDIA/Mellanox Spectrum switches and ConnectX Network Interface Cards (NICs)
Implement and tune congestion control mechanisms for AI workloads, including RoCEv2, Priority-based Flow Control (PFC), and Explicit Congestion Notification (ECN)
Optimize network environments for maximum throughput, minimal latency, and minimal Job Completion Time (JCT)
Conduct performance benchmarking and validation testing on AI-ready data center fabrics using RDMA and NVIDIA Collective Communication Library (NCCL)
Leverage AI agents and specialized tools to automate network tasks, conduct testing, and analyze network telemetry
Author and maintain technical documentation covering network designs, configurations, and benchmarking results
Work within an Agile project team in a startup environment serving a US-based client

Requirements

What you’ll need

7+ years of professional experience in network engineering
Preferably 3+ years specifically focused on data center network design and architecture
Hands-on experience configuring and troubleshooting BGP, EVPN/VXLAN, LACP, and ECMP
Deep understanding of AI-dedicated data center designs, including Rail-Optimized Design (ROD) and Rail-Unified Design (RUD) topologies, with practical hands-on configuration and deployment experience
Experience configuring, managing, and troubleshooting NVIDIA/Mellanox Spectrum switches and ConnectX Network Interface Cards (NICs)
Deep understanding of RoCEv2, Priority-based Flow Control (PFC), and Explicit Congestion Notification (ECN)
Ability to tune and optimize network environments, including switch buffer tuning and Quality of Service (QoS) policies
Experience conducting performance benchmarking and validation for AI-ready data center fabrics using RDMA and NVIDIA Collective Communication Library (NCCL)
Ability to leverage AI agents/tools to automate tasks, testing, and analysis
Strong technical documentation skills and professional English communication
Professional-level certifications (CCNP/CCIE Enterprise/DC, JNCIP or equivalent) preferred
Hands-on experience with network automation and validation frameworks (pyATS, NAPALM, Batfish, Nornir, NetBox) preferred
Exposure to CI/CD pipelines (GitLab CI, GitHub Actions, Jenkins) and IaC concepts preferred

Benefits

Comp & perks

Flexible working hours and approach to work: fully remotely, in the office or hybrid
Professional growth supported by internal training sessions and a training budget
Solid onboarding with a hands-on approach to give you an easy start
A great atmosphere among professionals who are passionate about their work
The ability to change the project you work on