WAF Engineer

Salary: £50,000 - 90,000 per year

Requirements:

• We are looking for demonstrable expertise in investigating, analysing, and resolving WAF false positives and false negatives.
• We need strong expertise in implementing WAF solutions in Detection mode and transitioning policies to Prevention/Block mode through appropriate tuning and validation.
• We are seeking proven expertise in developing and maintaining custom WAF rules, rule exclusions, rate limiting controls, and attack mitigation policies, rather than solely relying on out-of-the-box managed rules.
• We require extensive knowledge of web application attack vectors, including OWASP Top 10 vulnerabilities, SQL Injection, Cross-Site Scripting (XSS), Remote Code Execution (RCE), bot attacks, credential stuffing, and API abuse.
• We need advanced hands-on expertise in attack mitigation, threat analysis, and the creation of bespoke security controls based on observed attack patterns.
• We are looking for strong understanding of bot protection technologies, managed rule sets, policy tuning, and broader web application security best practices.
• We need demonstrated expertise with Azure Front Door WAF and Azure Application Gateway WAF in enterprise-scale environments.
• We require experience working across multi-cloud environments and/or vendor-agnostic WAF platforms.
• We are looking for expertise in deploying and managing WAF infrastructure using Terraform or other Infrastructure as Code (IaC) technologies.
• We need proven ability to support large-scale production environments, with responsibility for change implementation, incident response, and threat mitigation.
• A bachelors degree in Computer Science, Engineering, Information Technology, or a related field is preferred, or equivalent industry experience.
• Strong industry expertise within IT or Telecommunications environments is preferred, with Financial Services experience also preferred.
• We are looking for advanced expertise in Azure WAF and network management within complex enterprise environments.
• Deep technical expertise in Network Security, with exposure to technologies such as Azure Firewall, Palo Alto Firewall/VPN, and Cisco solutions, is considered advantageous.
• We need the ability to blend creativity, problem solving, and technical expertise to refine existing concepts and develop innovative approaches.
• We need the ability to drive business process improvements and collaborate effectively with stakeholders and peers.
• We need the ability to work under pressure and resolve complex technical issues effectively.
• Excellent interpersonal, stakeholder management, and communication skills are required.

Responsibilities:

• We perform analysis and tuning of WAF policies to minimise false positives and false negatives while maintaining an appropriate security posture.
• We design, implement, maintain, and optimise WAF policies across multi-cloud environments.
• We lead the investigation and mitigation of web application attacks, including OWASP Top 10 threats, bot attacks, credential stuffing, scraping, Layer 7 DDoS attacks, and other web-based threats.
• We develop, maintain, and enhance custom WAF rules, managed rule exclusions, rate-limiting policies, and bot protection controls.
• We support the transition of WAF policies from Detection mode to Prevention/Block mode through structured analysis, tuning, testing, and stakeholder engagement.
• We analyse attack patterns, logs, and telemetry to identify emerging threats and implement effective mitigations.
• We work closely with application owners, development teams, and security stakeholders to ensure secure onboarding and operation of internet-facing applications.
• We provide subject matter expertise for web application security, secure application delivery, and WAF best practices.
• We provide technical support to Audit & Compliance, Capacity Management, Lifecycle Management, Vulnerability Management, and Risk Management functions.
• We provide technical leadership during major incidents and drive quick resolutions.
• We coach team members on a proactive basis, raising the teams overall technical acumen.
• We restore service and complete root cause analysis of all incidents, driving actions to mitigate the root cause and remove risk of reoccurrence.
• We participate in the Technical Design Authority forum.
• We implement changes and POCs to the environment in a controlled manner, with implementation and test plans.

Technologies:

• API
• Azure
• Cloud
• Cisco
• Firewall
• Support
• Network
• OWASP
• SQL
• Security
• Terraform
• VPN
• WAF
• Web
• Office 365
• DevOps

More:

We are a critical enterprise technology capability within the Network Operations Centre, ensuring we provide the level of service required by our business and protect WTW and our customers. Our service operates 24/7/365 and covers office and data centre networks, network security appliances, and perimeter control. This WAF Engineer role is focused on maximising the operational performance of our services and maintaining a strong secure posture in a Tier 3 capacity. The role is based in London with a hybrid working style. We offer a benefits package designed to help you thrive professionally and personally, including 25 days of annual leave plus an extra WTW day, private healthcare, life insurance, group income protection, regular health assessments, a defined contribution pension with matched contributions up to 10%, hybrid working options, an employee assistance programme, a fully paid volunteer day, and optional perks such as an electric vehicle car scheme, share scheme, cycle-to-work programme, dental and optical cover, and critical illness protection. We are committed to equal employment opportunity and provide application, interview, and workplace adjustments and accommodations to all applicants.

last updated 36 week of 2026