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# Nexin - Medior / Senior BizTalk and .NET Developer

- **Company:** Nexin
Nexin
- **Location:** Brussel, Belgium (Remote available)
- **Experience:** Experienced
- **Salary:** €41,400.0 - €74,160.0
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, XML Schema, Artificial Intelligence, Microsoft Azure, Microsoft Biztalk Servers, C Sharp (Programming Language), Code Review, Continuous Integration, Software Debugging, Monitoring of Systems, Windows Communication Foundation, JSON, Microsoft Visual Studio, Microsoft SQL Server, Routing, Windows PowerShell, Broadcom, Simple Object Access Protocol (SOAP), Software Engineering, SQL Stored Procedures, SQL Databases, Systems Integration, Extensible Markup Language (XML), Extensible Stylesheet Language Transformations (XSLT), Data Logging, File Transfer Protocol (FTP), Enterprise Software Applications, SAP Integration Solutions, SOAPAPI, Git, Atlassian Tools, Restful APIs, Api Management
- **Published:** October 20, 2026
- **Apply:** https://www.ictjob.be/en/job/nexin-medior-senior-biztalk-net-developer/1-343193

## About the Role

> 5 years experience Bachelor (3 years)
English and (French or Dutch), To strengthen the internal IT team, our client is looking for a Medior / Senior BizTalk & .NET Developer (minimum 5 years of experience)., * At least 5 years of professional experience in software development, including proven experience developing and supporting Microsoft BizTalk and C#/.NET solutions, ideally with BizTalk Server 2020.

 * Strong C# and .NET Framework skills, with hands-on experience in Visual Studio.
 * Practical knowledge of BizTalk messaging, routing, promoted properties, MAPS, orchestrations and pipelines.
 * Experience with XML/XSD, XSLT, JSON, REST/SOAP services and adapters such as sFTP and WCF-SQL.
 * Solid SQL Server skills and experience troubleshooting integration or application issues in production.
 * Experience with GIT, testing and structured deployment practices.
 * Ability and willingness to combine development work with daily application support.
 * Proven use of AI tools in software development, such as coding assistants for implementation, testing, debugging and documentation, with critical review of generated output and respect for data confidentiality.
 * Fluent in Dutch or French, with a good working command of English.

Additional assets

 * Experience with SAP integrations, EDI/AS2 or other enterprise systems.
 * Knowledge of modern .NET, ASP.NET Core, Azure Logic Apps, Service Bus or API Management.
 * Experience with CI/CD, PowerShell, monitoring tools, or Jira and Confluence.
 * Knowledge of Broadcom Automic for scheduling and monitoring automated jobs and workflows.

Soft skills

 * An analytical mindset and a methodical approach to troubleshooting.
 * Ownership of issues through to resolution, with clear communication and a focus on business needs.
 * Ability to manage priorities calmly, collaborate with colleagues and document solutions clearly.

Work environment

 * Multicultural team
 * Flat organizational structure
 * Short decision-making lines
 * Strong collaboration culture
 * Fun culture
 * On-site presence in Belgium required (with homeworking)

## Description

* Design, develop and maintain integrations using Microsoft BizTalk Server 2020 and C#/.NET.
 * Create and maintain schemas, MAPS, orchestrations, pipelines, ports and adapter configurations.
 * Develop .NET components, services and REST/SOAP integrations; work with XML, XSD, XSLT and JSON.
 * Write and optimize SQL Server queries and stored procedures, and implement validation, error handling and logging.
 * Translate business requirements into technical solutions with business analysts and application owners.

Day to day support

 * Monitor interfaces and application health; investigate failed exchanges, suspended messages and processing delays.
 * Handle daily support requests and production incidents, prioritize business impact and keep users informed.
 * Diagnose issues across BizTalk, .NET, SQL Server and connected systems; coordinate resolution with IT teams and external partners.
 * Restore processing safely, including controlled message resubmission, and investigate root causes to prevent recurring incidents.
 * Maintain support procedures, runbooks and incident records; turn recurring problems into permanent improvements.

Quality and delivery

 * Test integrations and .NET changes, including failure scenarios, and contribute to code reviews.
 * Manage source code in GIT and support deployments with environment-specific configurations and rollback procedures.
 * Document interfaces and technical changes, and share knowledge with colleagues.

You will collaborate closely with business stakeholders and operational teams. As a BizTalk and .NET developer, you will work in tandem with another colleague