Senior Security Engineer (Infrastructure)

Tain; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

26 days holiday

Hybrid working

Private medical insurance

Life assurance (4x salary)

Pension

Employee assistance program

Job summary

At Tain, we are seeking a Senior Security Engineer (Infrastructure) to strengthen security across cloud and on‑prem environments. The role collaborates with INO, Corporate IT and Platform Engineering to enforce scalable controls, improve visibility and resilience, and mature security practices in high‑availability setups.

The candidate will apply expertise in networking, cloud, edge security, and infrastructure hardening, helping drive incident response, secure configurations and tooling across

Qualifications

• 5+ years in a security-focused engineering role
• Strong infrastructure, cloud or network security background
• Understanding of Layer 3/4/7 security concepts
• Experience securing cloud, hybrid and on-prem environments
• Knowledge of networking, firewalling and segmentation
• Experience with Cloudflare/Akamai or similar
• Experience with SIEM, logging and monitoring
• IAM and privileged access management experience
• Kubernetes/container security experience
• Infrastructure-as-Code and automation familiarity

Responsibilities

• Design, implement and improve security controls across on-prem, cloud and edge environments
• Support security architecture and hardening for servers, cloud platforms, Kubernetes and infrastructure services
• Operate SIEM, alerts and monitoring platforms
• Lead Layer 7/web security initiatives including WAF, reverse proxy and API protection
• Manage edge security platforms such as Cloudflare or similar
• Oversee vulnerability management and security assessments
• Advance endpoint security and Defender capabilities across environments
• Support IAM and privileged access security initiatives
• Assess emerging infrastructure threats and tooling
• Coordinate with ISO/compliance to align controls with governance requirements

Skills

Security engineering

Infrastructure security

Cloud & on-prem security

Networking principles

Edge & web security

SIEM & security monitoring

Kubernetes security

IaC & automation

IAM & privileged access

Regulatory/compliance awareness

Job description

Job Summary

We are seeking a Senior Security Engineer (Infrastructure) to help strengthen and mature infrastructure security capabilities across cloud and on-prem environments. This is a technical role focused on improving visibility, resilience and security maturity across the organisation.

The successful candidate will work closely with INO (Infrastructure & Network Operations), Corporate IT and Platform Engineering teams to strengthen network and platform security, implement scalable controls and support modern security practices across high‑availability environments. The role requires a technical understanding across networking, cloud, edge security, infrastructure hardening and operational security tooling. The successful candidate will remain close to engineering and operations whilst helping improve security standards, visibility and incident response capabilities across distributed environments.

Main Responsibilities

• Design, implement and improve security controls across on-premise, cloud and edge environments
• Support security architecture and hardening initiatives across servers, operating systems, cloud platforms, Kubernetes and infrastructure services
• Support implementation, tuning and operational maturity of SIEM, alerting and security monitoring platforms
• Support Layer 7 and web security initiatives including WAF, reverse proxy, API protection and edge security controls
• Support implementation and operational management of edge security platforms such as Cloudflare or similar technologies
• Support vulnerability management, remediation and infrastructure and networking security assessments across cloud and on-premise systems
• Lead and support the implementation, tuning and operational maturity of endpoint security, EDR and Microsoft Defender capabilities across infrastructure, corporate and production environments
• Support identity, access management and privileged access security initiatives across infrastructure environments
• Continuously evaluate emerging infrastructure threats, attack vectors and security tooling to strengthen the organisation’s security posture
• Work closely with ISO and compliance teams to ensure infrastructure security controls align with regulatory and governance requirements

Main Requirements

• 5+ years experience in a dedicated or heavily security-focused engineering role
• Strong background in infrastructure, cloud or network security engineering within high-availability environments
• Strong understanding of Layer 3, Layer 4 and Layer 7 security principles across modern network and infrastructure environments
• Experience securing cloud, hybrid and on-premise infrastructure environments
• Strong knowledge of networking, routing, switching, firewalling and network segmentation principles
• Experience with edge and web security platforms such as Cloudflare, Akamai or similar technologies
• Experience implementing and managing SIEM, logging, monitoring and security detection platforms
• Strong understanding of infrastructure hardening, IAM, privileged access management and secrets management
• Experience securing Kubernetes, containerised workloads and cloud-native infrastructure environments
• Experience with Infrastructure-as-Code, automation tooling and modern platform engineering practices
• Strong troubleshooting, communication and stakeholder management capabilities
• Experience operating within regulated or compliance-driven industries is advantageous

What’s in it for you?

• Experience a dynamic and team-orientated work environment.
• Opportunities for personal growth and learning
• An open, inclusive and supportive team where you will be valued, and your suggestions will be welcome.
• 26 days paid holiday per year. This is in addition to local public holidays.
• Competitive salary
• Hybrid Working
• Risk Benefits such as pension, Life Assurance (4x annual salary), Private Medical Insurance
• Team Building Opportunities
• Flexible core hours between 10am – 4pm
• Receive support whenever you need it with our Employee Assistance Program, available 24/7.
• Local discounts and more…

Our team is committed to keeping remuneration and benefits under constant review to make sure what we offer stays relevant.