Senior System Administrator

Europe (remote) / Remote (Europe), Europe, European Union·Full-time·Added 1 month ago

OnHires

25 open roles

Apply

What they offer

Freelance contract
Full-time hours.
Fully remote
Only from certain places, per the ad: “Remote, primarily during European business hours.”

What they ask for

Have the right to work in Spain
OnHires doesn't mention sponsorship, but this role may fit the Digital nomad visa.
Work in English
English is required, per the ad.
Have 7+ years of experience
Senior-level role.

The role

The company provides VPS and dedicated server hosting for FX brokers and traders.

We are looking for a reliable, hands-on Senior Systems Administrator who can support customer-facing infrastructure and contribute to technical improvement projects.

This is a long-term part-time role for someone comfortable working independently with production systems, customer issues, and business-critical infrastructure.

What you'll do

Administer and troubleshoot Windows and Linux servers.

Support Microsoft Hyper-V and VMware environments.

Diagnose issues with Dell and Supermicro servers.

Resolve customer incidents involving VPS, dedicated servers, virtualisation, and connectivity.

Maintain Active Directory, DNS, Group Policy, backups, and monitoring.

Support data centre infrastructure, storage, and networking.

Participate in upgrades, migrations, and infrastructure improvement projects.

Maintain clear technical documentation and follow change-management procedures.

Requirements

7+ years of systems, infrastructure, or data-centre experience.

Strong hands-on experience with:

Windows Server and Linux;

Hyper-V and VMware;

Dell and/or Supermicro servers;

Server and virtualisation troubleshooting.
Strong customer-facing experience in technical support or infrastructure operations, with the ability to troubleshoot issues and communicate clearly with both technical and non-technical users.

Experience in data centres, hosting, managed services, or another 24/7 infrastructure environment.

Good understanding of networking, storage, backup, and disaster recovery.

Strong spoken and written English.

Reliable, organised, and comfortable taking ownership of issues through resolution.

Working hours & availability
The role requires approximately 10-15 hours per week, with availability during 10:00-18:00 CET as needed. The schedule is flexible, but the ability to respond and support the team within these hours is important.

Engagement

Independent contractor.

Approximately 10-15 hours per week.

Remote, primarily during European business hours.

Rotating on-call coverage by agreement.

Requirements

Nice to have

VPS, dedicated hosting, or IaaS experience.

iDRAC, IPMI, SAN/NAS or Veeam.

PowerShell, Bash, Python, or Ansible.

Experience in fintech, trading, telecom, broadcast, or other mission-critical environments.

About OnHires

OnHires is a London-based recruitment and talent acquisition agency that specializes in connecting technology and business professionals with companies across Europe, the Middle East, and Asia. The company operates as a staffing and headhunting firm, offering services that range from executive search to full-cycle recruitment for roles in engineering, marketing, finance, and legal. With a focus on remote and hybrid placements, OnHires serves a diverse client base, from early-stage startups to established enterprises, and manages a significant volume of open positions across multiple sectors.

OnHires has a notable presence in Spain, with 28 currently open roles that are available to candidates based in the country, many of which are remote-friendly. The company's work culture is centered on flexibility and international collaboration, making it an attractive option for professionals seeking remote work opportunities with global teams. For international hires, OnHires offers the chance to work with a variety of clients and industries, providing a dynamic environment that values adaptability and cross-cultural communication.

Employees: 50
Headquarters: London, UK

Good to know if you are moving

OnHires is a remote-first recruitment agency, so most roles are remote-friendly, which is ideal for international professionals based in Spain.
The company places candidates in a wide range of industries, from tech and engineering to marketing and legal, offering diverse career opportunities.
OnHires operates across Europe, the Middle East, and Asia, providing exposure to international clients and teams.
As a staffing agency, OnHires itself does not offer direct employment; instead, it connects candidates with client companies, which may affect benefits and employment terms.

All open roles at OnHires