Senior IT Infrastructure Engineer

Slice Solutions; Barnsley; On-site; GBP 38,000 - 42,000; Full time

Job summary

Slice Solutions in Barnsley is seeking a Senior IT Infrastructure Engineer to join our technical team. The role combines hands‑on infrastructure engineering with advanced 3rd line technical support, predominantly from the Barnsley office with occasional field visits to customer sites.

You will install, configure and troubleshoot business networks, switches, firewalls, Routers and server infrastructure, while delivering upgrades and managing projects.

Qualifications

• Proven experience in IT infrastructure and field engineering.
• Hands-on experience with business IT networks and server environments.
• Ability to install, configure and troubleshoot networking gear and security devices.
• Experience delivering 3rd line technical support and project work.

Responsibilities

• Installing, configuring and maintaining IT networks and infrastructure at customer sites.
• Deploying and troubleshooting managed switches, firewalls, routers and wireless networks.
• Configuring VLANs, VPNs, routing, switching, DHCP, DNS and IP addressing.
• Installing and supporting Windows Server, Active Directory and Hyper-V environments.
• Delivering network upgrades, server migrations, firewall replacements and infrastructure projects.
• Providing 3rd line technical support, investigating and resolving complex customer issues.
• Acting as an escalation point for 1st and 2nd line technicians, offering technical guidance and support.
• Carrying out network assessments, site surveys and infrastructure health checks.

Skills

Field Engineer

Network Engineer

3rd Line Support

Windows Server

Active Directory

Tools

Managed switches

Firewalls

Routers

VPNs

Hyper-V

DNS/DHCP

Job description

Senior IT Infrastructure Engineer (Field & 3rd Line Support)

Location: Barnsley, South Yorkshire (S75) – Predominantly Office Based with Occasional Field Visits.

Salary: £38,000 – £42,000 per annum.

Full-time | Office Based with Field Engineering as Required.

We are looking for a technically skilled and customer-focused Senior IT Infrastructure Engineer to join a growing technical team based in the Barnsley area.

This is a predominantly office-based role, with visits to customer sites as and when required. We're looking for someone who lives within a reasonable commuting distance of our Barnsley office and enjoys combining hands‑on infrastructure engineering with advanced 3rd line technical support.

This is a fantastic opportunity for someone with a strong background in IT infrastructure and field engineering who enjoys installing, configuring and troubleshooting business networks, but is equally comfortable providing advanced technical support.

You’ll enjoy a varied role, resolving complex technical issues, supporting customers and working on infrastructure installations, upgrades and technical projects.

If you’re confident working with managed switches, firewalls, routers, VLANs, VPNs and server infrastructure, and enjoy the variety of technical support and hands‑on engineering, we’d love to hear from you.

Role overview

Working primarily from our Barnsley office, with occasional visits to customer sites as required, you’ll take responsibility for delivering reliable infrastructure solutions, resolving complex technical issues and supporting the wider technical team.

Your responsibilities will include:

• Installing, configuring and maintaining IT networks and infrastructure at customer sites.


• Deploying and troubleshooting managed switches, firewalls, routers and wireless networks.


• Configuring VLANs, VPNs, routing, switching, DHCP, DNS and IP addressing.


• Installing and supporting Windows Server, Active Directory and Hyper-V environments.


• Delivering network upgrades, server migrations, firewall replacements and infrastructure projects.


• Providing 3rd line technical support, investigating and resolving complex customer issues.


• Acting as an escalation point for 1st and 2nd line technicians, offering technical guidance and support.


• Carrying out network assessments, site surveys and infrastructure health checks.


• Diagnosing connectivity, performance and security issues, both remotely and on-site.


• Maintaining accurate technical documentation, configuration records and service tickets.


• Working closely with customers and colleagues to ensure projects and technical issues are managed effectively.

Skills and experience

We’re particularly interested in candidates who have developed strong practical infrastructure and networking skills, including hands‑on engineering experience, rather than solely working within a service desk environment.

Essential

• Proven experience as a Senior IT Technician, IT Field Engineer, Infrastructure Engineer, Network Engineer or similar.


• Strong hands‑on experience installing, configuring and troubleshooting business IT networks.


• Excellent knowledge of managed switches, including Layer 2/3 switching, VLANs, routing and network segmentation.


• Practical experience configuring business‑grade firewalls, security policies, NAT and VPNs.


• Experience installing and troubleshooting business wireless networks and access points.


• Good working knowledge of Windows Server, Active Directory, Group Policy, DNS, DHCP and Hyper‑V.


• Experience diagnosing and resolving complex infrastructure and networking issues.


• The confidence to provide 3rd line technical support and manage escalated incidents.


• Strong communication and customer service skills, with the ability to explain technical issues clearly.


• A proactive, organised approach and the ability to work independently or as part of a team.


• Must be based within a reasonable commuting distance of Barnsley (S75), as the role is predominantly office-based.


• A full UK driving licence.


• Experience within a Managed Service Provider (MSP) would be beneficial, but isn’t essential. We are equally interested in candidates from other technical backgrounds who can demonstrate the right practical experience.

Desirable

• Experience with any of the following would be an advantage:


• WatchGuard firewalls.


• HP/Aruba, Cisco or Ubiquiti networking equipment.


• Microsoft Azure and hybrid infrastructure.


• Microsoft 365 administration and migrations.


• Cyber security platforms such as ThreatLocker or Huntress.


• ConnectWise Manage / Asio.


• ITIL, Microsoft, Cisco CCNA or CompTIA certifications.


• Experience working across different networking vendors and customer environments would be particularly welcome.

About you

You will be a confident, hands‑on IT professional who enjoys solving technical challenges and delivering excellent customer service. Comfortable working primarily from the office, with occasional customer site visits, you’ll take ownership of complex issues, work independently and share your knowledge with colleagues.

This is an excellent opportunity to join a growing technical team where no two days will be the same.

You’ll benefit from:

• A competitive salary of £38,000 – £42,000.


• A varied, predominantly office-based role combining 3rd line technical support with hands‑on field engineering when required.


• Exposure to a wide range of customer networks, systems and technologies.


• Opportunities to work on infrastructure installations, upgrades and technical projects.


• The chance to further develop your expertise across networking, infrastructure, cyber security and cloud technologies.


• A supportive, experienced technical team where your knowledge and contribution will be valued.

You may be contacted directly by the employer should they wish to progress your application.