Back-End Developer – Sitecore XM 10.2 (Security \& Platform Stability)
We are looking for an experienced
Back-End Developer with deep expertise in Sitecore XM 10.2
, focused on
security, performance, and platform stability
. In this role, you will help strengthen the resilience of large-scale digital platforms and ensure a smooth transition toward
Sitecore XM Cloud
.
You will work closely with
solution architects, DevOps engineers, and IT security teams
to implement secure coding practices, improve performance, and ensure compliance with strict security and governance standards. This is a critical role in maintaining business continuity during a major CMS cloud migration.
Key Responsibilities
Maintain, stabilize, and secure an existing
Sitecore XM 10.2
environment until cutover to
XM Cloud
Implement and continuously improve
secure development practices
for Sitecore and .NET
Perform
vulnerability scanning, patching, and remediation
across Sitecore instances, pipelines, and custom modules
Conduct
code reviews
with a strong focus on security, scalability, and performance
Optimize platform performance through:
Caching strategies
SQL Server tuning
CDN and WAF optimizations
Improve
observability
by enhancing monitoring, logging, and alerting (e.g. Application Insights, Azure Monitor, or similar tools)
Contribute to the definition and adoption of
SLA/OLA
, incident management, and change management processes
Ensure
coexistence readiness with Sitecore XM Cloud
, including:
Content parity validation
Cache and purge coordination
Unified incident communication
Enforce
feature freeze policy
on the legacy platform (only security, compliance, and stability fixes unless approved via CAB)
Stay up to date with
Sitecore updates, .NET frameworks, and web security standards
Document all technical and security changes according to governance and audit requirements
Support the project team currently executing the
Sitecore XM Cloud migration
Requirements
Bachelor’s or Master’s degree in Computer Science, IT, or equivalent experience
5+ years of recent experience
in Sitecore back-end development with a focus on security and performance
5+ years of professional experience
with C# / .NET
Proven hands-on experience with
Sitecore XM 10.2
:
Installation
Configuration \& patching
Pipelines
Performance optimization
Strong knowledge of
web application security
(OWASP, secure headers, encryption, CSRF/XSS prevention)
Experience with
DevOps \& CI/CD pipelines
for Sitecore (Azure DevOps, GitHub Actions, or similar)
Experience with
on-premises Sitecore XM 10.2 deployments
, including manual deployment procedures
Strong skills in
SQL Server performance tuning
and Sitecore content delivery scaling
Experience with
WAF/CDN solutions
in combination with traditional Sitecore XM (e.g. F5, Azure Front Door, Cloudflare)
Practical knowledge of
application observability tools
(Application Insights, Seq, Kibana, or similar)
Familiarity with
Sitecore XM Cloud
is a strong plus
Understanding of
TOGAF 10.2
and strong technical documentation skills
Excellent communication skills in
English
(spoken and written); knowledge of
Dutch and/or French
is an asset
Strong collaboration skills and ability to work effectively with architecture, DevOps, and security teams
Additional Information
Work regime:
Full-time
Location:
Brussels
On-site presence:
2 days per week on-site (default requirement)
Freelancer is also possible