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.