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- Tasks: Support and evolve IT infrastructure for a growing company, ensuring stability and security.
- Company: Join a dynamic team at a leading tech company in London.
- Benefits: Competitive pay, flexible work arrangements, and opportunities for professional growth.
- Why this job: Make a real impact while working with cutting-edge technologies in a fast-paced environment.
- Qualifications: Hands-on experience with networks, firewalls, and Microsoft 365 required.
- Other info: Collaborative culture with opportunities to shape best practices and standards.
The predicted salary is between 48000 - 72000 £ per year.
We’re looking for an experienced System Administrator to join our Infrastructure team on a contract basis, helping us keep Reward’s IT estate stable, secure, and scalable as we continue to grow. You’ll play a key role in supporting and evolving the infrastructure that underpins our business from office networks and data centres to Microsoft 365, Intune, and endpoint management supporting 200+ employees across the organisation. This is a hands-on, infrastructure-heavy role, ideal for someone who enjoys ownership, problem solving, and working across a broad range of technologies in a fast-moving environment.
What you’ll be doing:
- Working onsite in our London office 3 days per week (rota with the team)
- Providing ad-hoc support to our Belfast office when required
- Owning and supporting office networks (LAN & Wi-Fi) design, build, performance and troubleshooting
- Managing firewalls: rules, NAT, segmentation, VPNs and firmware
- Supporting switching and core network services (VLANs, routing, redundancy)
- Maintaining network architecture standards, DNS/DHCP and capacity planning
- Supporting our on-prem/data centre server estate (hardware, OS, lifecycle, upgrades)
- Attending the central London data centre as needed for installs, upgrades and BAU support
- Executing patching, backups, monitoring and alerting, with a focus on reliability and compliance
- Administering Microsoft 365 and Intune (policies, baselines, deployments)
- Improving tooling, dashboards, documentation and operational processes
- Supporting and collaborating with junior and mid-level SysAdmins
- Providing out-of-hours support where required (on call may follow)
- Assisting with desktop support via Zendesk to keep day-to-day operations running smoothly
- Helping maintain PCI-DSS and ISO27001-aligned security standards
What we’re looking for:
- Strong hands-on experience with networks: LAN/Wi-Fi, TCP/IP, DNS, DHCP, VLANs, routing & VPNs
- Solid firewall management experience (rules, NAT, segmentation)
- Excellent hardware and infrastructure troubleshooting skills
- Strong experience with switching, routing, uplinks and redundancy
- Practical experience supporting Microsoft 365 and Intune
- Experience in on-prem environments and data centre operations
- Confident managing backups, restores and retention
- Comfortable working with servers, networking components and infrastructure services
- Clear communicator with both technical and non-technical stakeholders
- Proactive, detail-oriented and comfortable working autonomously
- Happy operating in a high-change environment with evolving processes
Nice to have:
- Advanced Excel (PowerPivot, VBA, complex formulas)
- Python for automation or data wrangling
- Exposure to cloud technologies
- Experience with Power BI or Tableau
- Familiarity with AWS governance and compliance
- Background in retail, banking, CRM, loyalty or digital marketing
- Degree in Computer Science, Engineering, Mathematics or similar
- A genuinely hands-on infrastructure-first contract role
- Exposure to a broad, modern tech estate
- Opportunity to help shape standards, tooling and best practices
- Collaborative team with real ownership and impact
If you’re a proactive SysAdmin who enjoys variety, responsibility, and improving how things work apply now!
Senior System Administrator employer: Reward
Contact Detail:
Reward Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior System Administrator
✨Tip Number 1
Network your way in! Reach out to current employees on LinkedIn or other platforms. A friendly chat can give you insider info and might just get your foot in the door.
✨Tip Number 2
Show off your skills! If you’ve got a portfolio or examples of past projects, bring them along to interviews. It’s a great way to demonstrate your hands-on experience and problem-solving abilities.
✨Tip Number 3
Be ready for technical questions! Brush up on your knowledge of LAN/Wi-Fi, firewalls, and Microsoft 365. We want to see that you can talk the talk and walk the walk when it comes to infrastructure.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who take that extra step!
We think you need these skills to ace Senior System Administrator
Some tips for your application 🫡
Tailor Your CV: Make sure your CV reflects the skills and experiences that match the job description. Highlight your hands-on experience with networks, firewalls, and Microsoft 365, as these are key for us.
Craft a Compelling Cover Letter: Use your cover letter to tell us why you're the perfect fit for this role. Share specific examples of how you've tackled challenges in infrastructure management and what you can bring to our team.
Showcase Your Problem-Solving Skills: In your application, don’t shy away from sharing instances where you've solved complex issues. We love candidates who can demonstrate their troubleshooting prowess and proactive approach.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity!
How to prepare for a job interview at Reward
✨Know Your Tech Inside Out
Make sure you brush up on your knowledge of LAN/Wi-Fi, TCP/IP, DNS, and DHCP. Be ready to discuss your hands-on experience with these technologies, as well as any specific challenges you've faced and how you overcame them.
✨Showcase Problem-Solving Skills
Prepare examples of past situations where you had to troubleshoot complex infrastructure issues. Highlight your thought process and the steps you took to resolve the problems, as this role requires a proactive approach to problem-solving.
✨Familiarise Yourself with Microsoft 365 and Intune
Since you'll be managing Microsoft 365 and Intune, it’s crucial to understand their policies, baselines, and deployment processes. Be ready to discuss your experience with these tools and how you've used them to improve operational efficiency.
✨Communicate Clearly and Confidently
Practice explaining technical concepts in simple terms, as you'll need to communicate with both technical and non-technical stakeholders. Being a clear communicator will set you apart and show that you can bridge the gap between different teams.