Unity Systems
Senior Security Engineer
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Principal Security Engineer — Security Engineering Solutions
Role Overview
We are seeking a Principal Security Engineer to provide hands-on technical leadership across network and infrastructure security engineering, architecture, automation and operational security.
Contract
- 6 Months (Renewable), with potential for long-term extension
- IR35: Outside IR35
- On-site: 2–3 days per week in Greater London during the first month, reducing to 1–2 days per week thereafter
Key Responsibilities
- Lead security engineering, architecture, implementation and operational maturity across enterprise environments.
- Design and manage WAF, DDoS, NDR and micro-segmentation solutions.
- Own and optimise Imperva WAF & DDoS, ExtraHop NDR and Illumio micro-segmentation.
- Drive security automation, Security-as-Code, Infrastructure-as-Code and API-driven configuration management.
- Integrate security platforms with SIEM, SOAR, ITSM, monitoring and telemetry.
- Provide technical leadership for complex security incidents, troubleshooting and root-cause analysis.
- Define security architecture, engineering standards and reusable security patterns.
- Partner with Network, Infrastructure, Software Engineering, SOC and Application teams.
- Mentor security engineers and act as an escalation point for complex technical issues.
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Essential Skills & Experience
- Strong hands-on enterprise security engineering experience.
- Expertise in several areas including WAF, DDoS, NDR, micro-segmentation, network security architecture, TCP/IP, security monitoring, cloud/hybrid security and incident response.
- Hands-on experience with Imperva, ExtraHop and/or Illumio highly desirable.
- Strong networking knowledge: TCP/IP, DNS, HTTP/HTTPS, TLS, routing, firewalls, ACLs, load balancing and network segmentation.
- Experience with Python, PowerShell, REST APIs, JSON/YAML, Git, Terraform/IaC, CI/CD and security automation.
- Proven Principal/Lead-level technical leadership, problem-solving and stakeholder engagement skills.
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Desirable
- Financial services or other regulated-industry experience.
- AWS/Azure, hybrid cloud, Zero Trust and DevSecOps experience.
- SIEM/SOAR/ITSM integrations.
- Security architecture reviews and major cyber incident experience.
- Relevant security, networking, cloud or vendor certifications.
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