Back-End Developer – Sitecore Web Security Service

Back-End Developer – Sitecore Web Security Service

Key Responsibilities:

• Maintain and stabilize the existing Sitecore XM 10.2 platform until cutover to XM Cloud.
• Implement and continuously improve secure development practices for Sitecore and .NET.
• Perform vulnerability scanning, patching, and remediation for Sitecore instances, pipelines, and modules.
• Conduct regular code reviews with a focus on performance, scalability, and security.
• Optimize platform performance through caching, database tuning, and CDN/WAF improvements.
• Strengthen observability by enhancing monitoring, logging, and alerting (e.g., Application Insights, Azure Monitor or similar application).
• Participate in the definition and adoption of SLA/OLA, incident, and change management processes.
• Ensure coexistence readiness with XM Cloud — including content parity validation, cache/purge coordination, and unified incident communication.
• Support the feature freeze policy on legacy XM 10.2: only security, compliance, and stability fixes unless approved via CAB.
• Stay current with emerging web security standards, Sitecore patches, and .NET frameworks.
• Document all technical and security changes following governance and audit requirements.
• Support the project team, currently working on a migration to Sitecore XM Cloud.

Requirements:

• Bachelor’s or master’s degree in computer science, Information Technology, or equivalent professional experience.
• Minimum of 5 years recent experience in Sitecore back-end development with a security and performance focus.
• 5+ years of professional experience in back-end development with C#/.NET.
• Proven experience with Sitecore XM 10.2 (installation, pipelines, configuration, patching, and performance optimization).
• An excellent knowledge of English with knowledge of Dutch and/or French
• Knowledge of Sitecore XM Cloud is a plus
• Strong knowledge of web application security principles (OWASP, secure headers, encryption, CSRF, XSS prevention).
• Experience with DevOps & CI/CD pipelines for Sitecore deployments (Azure DevOps, GitHub Actions, or similar).
• Experience with working with Sitecore XM 10.2 on-premises with manual deployment procedure
• Hands-on experience with SQL Server performance tuning and Sitecore content delivery scaling.
• Experience with WAF/CDN configurations in combination with Traditional Sitecore XM 10.2 on-premises (e.g., F5, Azure Front Door, Cloudflare).
• Practical knowledge of application observability tools such as Application Insights, Seq, Kibana, or similar software.
• Excellent collaboration skills; ability to work effectively with architects, DevOps, and security teams.
• Strong documentation and communication abilities in English (both written and verbal).
• TOGAF 10.2 understanding and document writing skills

Additional information:

• Work regime: fulltime
• Location: Brussel
• Onsite presence: 2 days of physical presence on site / week by default is required
• Important: if the consultant will work in Belgium, for non-EU candidates, please present candidates who comply with the following criteria:
• Possess a work permit allowing the individual to work in Belgium.
• Hold a valid residence permit confirming the right of residence in Belgium.