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Senior System Engineer (CloudGate)
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- Remote from
- Europe
- Salary
- Undisclosed
- Department
- Software Engineering
- Employment
- Full Time
- Experience
- Senior
- Published
- Apply before
- 27 Nov 2026
- Listing views
- 33
- Application actions
- 2
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The role, at a glance.
Senior System Engineer will develop the data plane for Nebius Cloud network services that handle high-volume external traffic. The role focuses on performance, scalability, reliability, load testing, and automation of interactions among network services. The engineer will work with cloud connectivity capabilities such as IPv4, interconnect, egress NAT, and network load balancing in a microservice environment using gRPC. Strong C programming and network-routing knowledge are essential, while experience with VPP, DPDK, Linux networking, SDN, and BGP is advantageous. The position includes coding interviews and offers substantial technical ownership in a fast-moving AI cloud infrastructure organization.
Role DNA
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Pace & Pressure
5/5Autonomy Level
4/5Communication Load
3/5Salary analysis
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Core skills
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Sample interview questions
I would first define throughput, latency, failure-handling, and observability requirements. I would use efficient packet-processing paths, minimize copying and synchronization, select appropriate connection-state handling, and validate the design with realistic traffic and failure load tests.
I would correlate service metrics, interface counters, packet drops, CPU utilization, queue depth, and latency histograms. I would then use tracing and packet captures where safe, isolate whether the bottleneck is in application processing, kernel networking, NIC queues, routing, or a downstream dependency, and verify improvements with repeatable load tests.
I would define clear ownership and idempotent APIs, persist workflow state, use retries with bounded backoff, and include compensation actions for partial failures. I would also add correlation IDs, structured logs, metrics, and end-to-end tests covering retries, timeouts, and inconsistent dependency states.
Kernel networking offers mature tooling, broad compatibility, and simpler operational integration. User-space frameworks can reduce overhead and improve throughput or latency through polling, batching, and direct NIC access, but they increase operational complexity and require careful CPU, memory, and NIC resource management.
I would begin with unit and integration tests for control-plane and data-plane behavior, then use an isolated environment with representative topologies and traffic. I would test normal paths, route convergence, failover, MTU behavior, malformed traffic, and performance limits, followed by staged rollout with monitoring and a tested rollback plan.
About this role.
About Nebius:
Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure.
Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI.
Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D.
The role
Our CloudGate team is responsible for the software side of external network connectivity in our Cloud. We’re building a traffic delivery system for a variety of scenarios: IPv4 connectivity, Cloud Interconnect, Egress NAT, and a network load balancer. They serve tens of millions of packets per second.
We have a control plane microservice architecture with gRPC transport and our own Database as our data warehouse.
What we do:
- Increase service scalability
- Developing service functionality with support for service endpoints and expansion of health check types
- Improve the internal architecture, optimizing interaction with related services
In this position, your responsibility will be to:
- Developing a data plane for Nebius Cloud network services
- Improve service performance and reliability
- Automate complex cross-service interaction scenarios
- Perform load testing for services
We expect you to have:
- Capable of writing reliable, high-performance code
- Proficient in C and ready to learn Go/C++
- Familiar with routing network traffic
It would be an added bonus if you had:
- Worked with VPP, DPDK, and the Linux kernel network subsystem
- Well-versed in virtual networks and overlays, SDN, NFV, DPI, network protocols, routing and tunneling, BGP, and MPL
We conduct coding interviews as part of the process.
#LI-JS1
Benefits & Perks:
- Competitive compensation
- Career growth and learning opportunities
- Flexibility and ownership
- Collaborative and innovative culture
- Opportunity to work on impactful AI projects
- International environment and talented teams
What’s it like to work at Nebius:
Fast moving – Bold thinking – Constant growth – Meaningful impact – Trust and real ownership – Opportunity to shape the future of AI
Equal Opportunity Statement:
Nebius is an equal opportunity employer. We are committed to fostering an inclusive and diverse workplace and to providing equal employment opportunities in all aspects of employment. We do not discriminate on the basis of race, color, religion, sex (including pregnancy), national origin, ancestry, age, disability, genetic information, marital status, veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by applicable law.
Applicants must be authorized to work in the country in which they apply and will be required to provide proof of employment eligibility as a condition of hire.
If you need accommodations during the application process, please let us know.
Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›
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