Freelance: Integration .NET developerbr/ Location: Brussels (city centre)br/ Start Date: ASAPbr/ Contract Type: Freelance or Employee (12-month mission, with possible extension)br/ Work Mode: Hybrid (on-site and remote)br/ br/ h2Mission context objectives /h2 br/ My client is seeking an Integration .NET Developer to support the digital transformation of its internal systems.br/ The candidat will begin the mission within the central integration team, learning and applying the company's development standards and integration best practices. Once onboarded, they will be assigned to a business IT department to support ongoing projects and help strengthen the .NET integration expertise within the team.br/ br/ h2Role responsibilities /h2 ul li Design, implement and test new software components, enhancements, and fixes.br/ /li li Work on integration solutions involving internal systems, external packages, and cross-technology platforms.br/ /li li Write clear and structured documentation.br/ /li li Participate in troubleshooting and incident resolution.br/ /li li Coordinate deployments to test, staging, and production environments via the company's release processes.br/ /li li Collaborate with functional analysts, business stakeholders, and infrastructure teams.br/ /li /ul br/ h2Required skills experience /h2 br/ Technical skills - mandatory (2 to 5 years)br/ ul li Development with .NET C# (Framework 4.0 and above)br/ /li li Experience with WCF web servicesbr/ /li li REST APIs (JSON, Swagger/OpenAPI)br/ /li li XML technologies: XSD, XSLT, XPathbr/ /li li Microsoft development stack: Visual Studio, TFS / VSTS (Azure DevOps)br/ /li /ul br/ Technical skills - preferredbr/ ul li Integration with batch schedulers (e.g., Control-M)br/ /li li Exposure to Mainframe (z/OS) applicationsbr/ /li li Experience with authentication protocols (SAML, OAuth)br/ /li li SQL Server SSISbr/ /li li Microsoft BizTalkbr/ /li li Dynamics CRMbr/ /li li Automated performance and load testingbr/ /li /ul br/ Functional experience - mandatory (2 to 5 years)br/ ul li Solid understanding of integration architecture and common integration patternsbr/ /li li Experience designing integration workflowsbr/ /li /ul br/ Soft skills - mandatorybr/ ul li Autonomous and proactivebr/ /li li Solution-oriented with a pragmatic mindsetbr/ /li li Adaptable and collaborativebr/ /li li Strong communication skillsbr/ /li /ul br/ Business experiencebr/ ul liMandatory: Proven experience in software/application development using .NET, especially in API and/or batch system integration. /li liPreferred: Experience in the insurance or financial services sectors /li liLanguage requirements: ul liEnglish - basic /li liFrench - fluent /li liDutch - fluent /li /ul /li /ul br/ The developer must be fluent in either French or Dutch, with at least basic knowledge of the other language.br/ br/ h2Additional information /h2 ul li Duration: 12 months (extension possible depending on project evolution)br/ /li li Location: Brussels city centre (easy access by public transport)br/ /li li Workload: Full-timebr/ /li /ul