Areti Group | B Corp™
Infrastructure Engineer (M365)
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Senior Infrastructure Engineer — M&A Integration Central London | Outside IR35 | £550–£650 per day | Initial 3-month contract
The opportunity
An ambitious, acquisitive business is scaling fast — multiple deals in progress, new sites landing regularly, and a growing footprint that needs infrastructure to match. They're bringing in a senior contractor to own the technical side of that growth: making sure every acquisition integrates cleanly, every site comes online securely, and the core estate stays stable while everything around it changes.
This isn't a maintenance role. You'll be hands-on with live integrations from day one, working at pace across networks, cloud platforms and directory services while the business continues to acquire.
What the role involves
- Owning IT due diligence, assessment and integration for incoming acquisitions — from first audit through to full consolidation
- Running network operations across sites: LAN/WAN design, VPN connectivity, IP schema management and firewall administration (Palo Alto)
- Auditing cloud estates (AWS and Azure) and core business applications (ERP, CRM) as part of the integration process
- Delivering migrations — including cross-tenant Google Workspace moves and directory consolidation across acquired entities
- Partnering with external MSPs and the internal team to keep uptime, security posture and compliance on track throughout
- Owning monitoring, incident response and disaster recovery planning so acquisitions don't introduce risk
- Acting as the senior technical escalation point, guiding less experienced engineers through complex problems
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What you'll bring
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- Deep hands-on experience with AWS, Google Workspace, and hybrid infrastructure spanning Linux and Windows Server
- Strong core networking — TCP/IP, DNS, DHCP, routing/switching, VPNs and firewall config; CCNA or CCNP a plus
- Confidence managing identity and directory services through multi-domain consolidations
- Automation skills in Python and/or Bash, plus Infrastructure as Code experience (Terraform or CloudFormation)
- A track record with enterprise systems (ERP/CRM) and, ideally, prior exposure to M&A-driven IT integration
- Working knowledge of GDPR and ISO 27001 requirements in a live compliance environment
- Comfort standing up new sites quickly, under real deadline pressure
- Exposure to monitoring platforms (Datadog, CloudWatch) and coordination with a SOC function
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