Integration Developer C# .Net (SC Cleared)

Salary: £? - ? per yearRequirementsExperience designing and implementing integration solutions using C#, .NET, or similar programming languagesExperience building RESTful APIs and backend servicesExperience with integration platforms such as Azure Logic Apps, Azure Data Factory, SSIS, or other middleware toolsExperience with API tools such as Postman, Swagger, and API gatewaysExperience working with REST and/or SOAP APIs, including authentication, authorization, and secure data exchangeExperience with data transformation between formats such as JSON, XML, and CSVExperience with unit, integration, and end-to-end testing of integration workflows and APIsExperience debugging issues using tools such as Fiddler, Postman, and application logsExperience documenting API contracts, integration configurations, and solution architectureAbility to collaborate with business stakeholders, IT teams, external partners, developers, data engineers, QA teams, and business analystsAbility to communicate technical designs, project updates, and roadblocks to technical and non-technical stakeholdersCommitment to keeping up to date with integration frameworks, cloud technologies, and development best practicesPreferred candidate from HM Revenue & Customs (HMRC), Department for Work and Pensions (DWP), Home Office, Ministry of Defence (MOD), Ministry of Justice (MOJ), HM Treasury, Department for Education (DfE), Department for Transport (DfT), Department of Health and Social Care (DHSC), Department for Environment, Food & Rural Affairs (DEFRA), Department for Science, Innovation & Technology (DSIT), or Foreign, Commonwealth & Development Office (FCDO)ResponsibilitiesCollaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflowsDesign data mappings, transformations, APIs, and message schemas to support secure and efficient data exchange between systemsDesign, develop, test, and deploy integration solutionsBuild RESTful APIs and backend services to support integration needsConfigure connectors and implement error handling and retry mechanisms to ensure reliability and data integrityOrchestrate data flows and integrate diverse systems using integration platforms and middleware toolsBuild and maintain APIs, including REST and SOAP servicesIntegrate internal and third-party APIs to support service-oriented and event-driven architecture across systemsImplement data transformation logic between different formats and schemasPerform unit, integration, and end-to-end testing of integration workflows and APIsDebug issues and continuously improve performance and reliability through code refactoring and system tuningDocument API contracts, integration configurations, and solution architectureProvide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycleWork closely with software developers, data engineers, QA teams, and business analysts to align integration work with project goalsParticipate in knowledge-sharing sessions and contribute to continuous improvement of integration standards and code qualityTechnologiesAPIAzureBackendC#CloudFiddlerSupportJSONPostmanRESTSOAPSSISSwaggerXMLASP.NETFlowMoreWe are seeking an Integration professional to support secure and efficient data exchange between systems. You will work across business and technical teams to design, build, test, and maintain integration solutions, APIs, and data flows. You will use tools and platforms such as Azure Logic Apps, Azure Data Factory, SSIS, Postman, Swagger, and API gateways, while contributing to documentation, reporting, collaboration, and continuous improvement. GCS is acting as an Employment Business in relation to this vacancy.last updated 40 week of 2026

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