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About Us
We are a French company specializing in the development and operation of critical computing infrastructures, with a focus on high-density data centers dedicated to artificial intelligence. In full growth mode, our mission is to design, build, and operate next-generation computing campuses across France and internationally — converting France's decarbonised electricity into AI computing power, in the service of European digital sovereignty. With sites in Valence (Drôme), Hauts-de-France and Île-de-France, our solutions power the most demanding AI workloads for leading clients in the industry. We are looking for a Senior Network Engineer to design, build, and operate the network fabric of our AI data centers, where reliability and ultra-low latency are non-negotiable.
Your Responsibilities
As a Senior Network Engineer, you will own the design, deployment, and day-to-day operation of all networking layers within Sesterce data centers — from top-of-rack switches to core routing, WAN connectivity, and out-of-band management. You will be the technical authority on all things networking and a key contributor to our datacenter buildout projects.
Network Architecture & Design
Ready to take on the challenge? Don't hesitate — apply now! We're excited to meet you and build the future of AI infrastructure together. If you are a seasoned Network Engineer with a passion for high-performance and critical infrastructure, we invite you to apply. Please submit your resume and a cover letter to [email protected]. Include "Senior Network Engineer Application - [Your Name]" in the subject line.
We are a French company specializing in the development and operation of critical computing infrastructures, with a focus on high-density data centers dedicated to artificial intelligence. In full growth mode, our mission is to design, build, and operate next-generation computing campuses across France and internationally — converting France's decarbonised electricity into AI computing power, in the service of European digital sovereignty. With sites in Valence (Drôme), Hauts-de-France and Île-de-France, our solutions power the most demanding AI workloads for leading clients in the industry. We are looking for a Senior Network Engineer to design, build, and operate the network fabric of our AI data centers, where reliability and ultra-low latency are non-negotiable.
Your Responsibilities
As a Senior Network Engineer, you will own the design, deployment, and day-to-day operation of all networking layers within Sesterce data centers — from top-of-rack switches to core routing, WAN connectivity, and out-of-band management. You will be the technical authority on all things networking and a key contributor to our datacenter buildout projects.
Network Architecture & Design
- Design and implement scalable, resilient data center network architectures (spine-leaf, BGP EVPN/VXLAN).
- Architect InfiniBand networks with multitenancy and UFM on Cumulus OS.
- Specify and size network equipment for new DC buildouts and capacity expansions.
- Lead security processes including CVE audit and remediation on switches and firewalls.
- Deploy, configure, and maintain switches, routers, firewalls, and load balancers (Arista, Cisco, Juniper, or equivalent).
- Manage WAN and peering connectivity: BGP sessions, transit providers, IXP interconnects.
- Configure and maintain out-of-band management (OOB) and console server infrastructure.
- Perform network performance tuning, capacity planning, and traffic engineering.
- Handle structured cabling and fibre patching (LC, MPO/MTP) on the DC floor.
- Develop and maintain network automation scripts and playbooks (Python, Ansible, Nornir).
- Integrate network devices into monitoring and telemetry stacks (Grafana, Prometheus, gNMI/gRPC).
- Contribute to Infrastructure-as-Code practices (Git-based config management, CI/CD for network changes).
- Act as L3 escalation point for all network incidents.
- Lead root-cause analysis and post-mortem processes following major incidents.
- Participate in on-call rotation and ensure rapid resolution of production issues.
- Enforce network security best practices: ACLs, micro-segmentation, DDoS mitigation.
- Collaborate with the security team on compliance requirements (SOC 2, ISO 27001).
- Maintain up-to-date network diagrams and operational documentation
- Education: Bachelor's degree or higher in Computer Science, Networking, Telecommunications, or equivalent.
- Experience: Minimum 5 years in network engineering, with at least 2 years in a data center environment. Proven experience designing and operating production spine-leaf fabrics at scale.
- Technical Skills: Expert-level knowledge of routing and switching (BGP, OSPF, MPLS, EVPN/VXLAN, STP/RSTP); hands-on experience with Arista EOS, Cisco NX-OS, Juniper Junos; strong Linux networking skills (namespaces, bridges, bonding, VRFs, eBPF); experience with automation tools (Python, Ansible, Netmiko, NAPALM, Nornir); familiarity with observability tooling (Grafana, Prometheus, ELK, streaming telemetry); knowledge of fibre optics (DWDM, coherent), MPO/MTP cabling, OTDR testing. InfiniBand networking experience (HDR/NDR, RDMA/RoCE, OpenSM/NVIDIA UFM) is a strong plus. Certifications (CCNP/CCIE, JNCIP, ACE) are a strong advantage.
- Soft Skills: Strong analytical mindset, autonomous and rigorous under pressure, excellent communication skills with both technical and non-technical stakeholders, collaborative team spirit across infrastructure, SRE and security teams, and an ownership mindset — you take problems end-to-end.
- Languages: Fluent English required. French is a plus.
- A senior technical role at the core of France's most ambitious AI infrastructure programme.
- A technically rich environment: high-density GPU clusters, ultra-low latency fabrics, cutting-edge hardware.
- Real ownership and decision-making power over the network architecture.
- A close-knit, high-calibre team with a culture of engineering excellence.
- Fast career progression in a rapidly scaling company.
- Competitive compensation based on profile and experience, plus benefits: health insurance, meal vouchers, transport reimbursement.
Ready to take on the challenge? Don't hesitate — apply now! We're excited to meet you and build the future of AI infrastructure together. If you are a seasoned Network Engineer with a passion for high-performance and critical infrastructure, we invite you to apply. Please submit your resume and a cover letter to [email protected]. Include "Senior Network Engineer Application - [Your Name]" in the subject line.
Key Skills
Ranked by relevance
ai
switches
bgp
prometheus
ansible
grafana
python
wan
artificial intelligence
network security
firewalls
routers
server
linux
ospf
acls
cicd
mpls
git
elk
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- Posted
- Apr 01, 2026
- Type
- Full-time
- Level
- Not Applicable
- Location
- Us
- Company
- Sesterce
Industries
IT Services
IT Consulting
Categories
Information Technology
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3 roles aligned with this opportunity
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