Senior System Administrator

OnHires; Paris; À distance; EUR 50 000 - 80 000; Plein temps

Résumé du poste

A leading company in fintech is seeking a Senior System Administrator to join their high-performance infrastructure team. You will manage and optimize systems in a 24/7 low-latency environment, ensuring robust support for global trading platforms. This role requires strong technical skills and a proactive approach, with opportunities to work on critical systems and contribute to data center upgrades.

Prestations

Streamlined hiring process

Collaborative team environment

Ownership and flexibility in role

Qualifications

• 5+ years in system/network administration or helpdesk support.
• Proficient in Windows Server, AD, DNS, and Group Policy.
• Solid experience with Linux servers.

Responsabilités

• Design, deploy, and maintain virtualized environments.
• Support dedicated and virtual servers for clients.
• Monitor system health and performance for 24/7 availability.

Connaissances

System Administration

Network Administration

Troubleshooting

Customer Communication

Proactive Mindset

Outils

Windows Server 2016/2019/2022

VMware

Hyper-V

Linux

Python

Bash

Ansible

C#

Description du poste

Remote | Full-time | Fintech Infrastructure | Fast Hiring Process

We’re looking for a Senior System Administrator to join a high-performance infrastructure team supporting global trading platforms. You’ll manage and optimize both physical and virtualized systems in a 24/7 low-latency environment. This role blends hands-on server/network work, customer support, and infrastructure planning, ideal for someone with strong technical skills and a proactive mindset.

What You’ll Do

• Design, deploy, and maintain virtualized environments (VMware / Hyper-V).

• Support dedicated and virtual servers for internal teams and external clients.

• Manage Windows and Linux systems, DNS, AD, Group Policy, and patching.

• Monitor system health and performance to ensure 24/7 availability.

• Handle incident response, disaster recovery, and backups.

• Contribute to data center upgrades and new deployments.

• Provide technical support via portal and chat platforms (Slack, Skype, Live Chat).

• Collaborate with sales teams on client onboarding and server design.

• Maintain clear technical documentation and ensure ISO 27001 compliance.

• Participate in a rotating on-call schedule for production support.

Key Skills & Qualifications

• 5+ years in system/network administration or helpdesk support.

• Proficient in Windows Server 2016/2019/2022, AD, DNS, and Group Policy.

• Solid experience with Linux servers.

• Understanding of networking fundamentals: firewalls, VLANs, ACLs, and switching.

• Hands-on with VMware or Hyper-V.

• Excellent troubleshooting and customer communication skills.

• Proactive, self-driven, and team-oriented.

Nice to Have

• Certifications: CompTIA A+, Network+, MCSA.

• Scripting with Python, Bash, Ansible, C#.

• Experience with Equinix data centers and SmartHands.

• Background in client-facing infrastructure design.

Why Join Us

• Work on global, latency-sensitive systems powering critical trading platforms.

• Gain broad exposure across systems, networking, security, and virtualization.

• High-impact role with ownership and flexibility in a collaborative team.

• Enjoy a nimble, tech-driven culture where your ideas matter.

• Streamlined hiring process:
  1. Technical interview with CTO
  2. Final interview with leadership