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Integration Developer (SC Cleared)
Added 08/10/2026
Reference: SM081026_1791461900

System Integration Developer | SSIS | APIs | C#/.NET | SC ClearedWe are looking for an experienced System... Read more

System Integration Developer | SSIS | APIs | C#/.NET | SC Cleared

We are looking for an experienced System Integration Developer / Engineer to join a client project requiring strong, recent hands-on experience delivering system integrations using SSIS and APIs.

The successful candidate will have a proven background in system integration projects, with their recent experience clearly demonstrating practical use of SQL Server Integration Services (SSIS) and API integrations, alongside exposure to C# and/or .NET technologies.

Key ResponsibilitiesDesign, develop and deliver system integration solutionsBuild and maintain integrations using SSIS (SQL Server Integration Services)Develop and support API-based integrations, including REST/API servicesWork across multiple applications and systems to ensure reliable data and service integrationTroubleshoot integration issues and support testing and deployment activitiesWork with technical and business stakeholders throughout the integration lifecycleEssential ExperienceStrong recent hands-on SSIS experienceStrong recent API integration experienceProven experience delivering system integration projectsExperience working with C# and/or .NET technologiesAbility to demonstrate the above experience within recent roles/projectsActive or lapsed SC Clearance is essentialDesirable ExperienceRESTful APIs / Web APIsSOAP / Web ServicesMicrosoft SQL ServerIntegration testing and troubleshootingExperience working within secure or government environmentsClearance

Candidates must hold active or previously held/lapsed SC Clearance to be considered.

Interested?

If you have recent hands-on experience with SSIS, API integrations and C#/.NET and hold active or lapsed SC Clearance, please apply with your latest CV detailing your recent system integration project experience.

GCS is acting as an Employment Business in relation to this vacancy.

Read less
£500.00 - £800.00
Per day

Exeter, England, United KingdomContractRemote

Integration Developer (SSIS, SQL) (SC Cleared, Public Sector)
Added 05/10/2026
Reference: 1234567_1791191323

your recent hands-on SSIS experience, especially where you have used SSIS for system-to-system integration, rather than mainly reporting... Read more

your recent hands-on SSIS experience, especially where you have used SSIS for system-to-system integration, rather than mainly reporting or data warehousing.

Be prepared to explain:

Which systems you integrated using SSISHow data moved between the systemsWhat transformations/mappings you performedHow frequently the integration ranHow you handled errors and validate

Integration Design:
Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows. Design data mappings, transformations, APIs, and message schemas to facilitate the secure and efficient exchange of data between systems.Integration Platforms and Tools:
Utilize integration platforms such as Azure Logic Apps, Azure Data Factory, SSIS, or other middleware tools to orchestrate data flows and integrate diverse systems. Experience with tools such as Postman, Swagger, and API gateways is highly desirable.API and Service Integration:
Build and maintain APIs (REST and/or SOAP), working with authentication, authorization, and secure data exchange. Integrate internal and third-party APIs to facilitate service-oriented and event-driven architecture across systems.Data Transformation and Mapping:
Implement data transformation logic to convert between formats like JSON, XML, and CSV. Design reusable components and mappings to streamline data flow between systems with different schemas or protocols.Testing and Debugging:
Perform unit, integration, and end-to-end testing of integration workflows and APIs. Debug issues using tools such as Fiddler, Postman, and application logs. Continuously optimize performance and reliability through code refactoring and system tuning.Documentation and Reporting:
Document API contracts, integration configurations, and solution architecture to support maintainability. Provide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycle.Collaboration and Communication:
Work closely with software developers, data engineers, QA teams, and business analysts to align integration work with broader project goals. Clearly communicate technical designs, project updates, and roadblocks to both technical and non-technical stakeholders.Continuous Learning:
Keep up-to-date with integration frameworks, cloud technologies, and development best practices. Actively participate in knowledge-sharing sessions and contribute to the continuous improvement of integration standards and code quality

GCS is acting as an Employment Business in relation to this vacancy.

Read less
£600.00 - £650.00
Per day

London, England, United KingdomContractRemote

Integration Developer C#,.Net (SC Cleared, Public Sector)
Added 23/09/2026
Reference: 9875130_1790178824

Integration Design: Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows.... Read more

Integration Design:
Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows. Design data mappings, transformations, APIs, and message schemas to facilitate the secure and efficient exchange of data between systems.Development and Implementation:
Design, develop, test, and deploy integration solutions using C#, .NET, or similar programming languages. Build RESTful APIs and backend services to support integration needs. Configure connectors and implement robust error handling and retry mechanisms to ensure reliability and data integrity.Integration Platforms and Tools:
Utilize integration platforms such as Azure Logic Apps, Azure Data Factory, SSIS, or other middleware tools to orchestrate data flows and integrate diverse systems. Experience with tools such as Postman, Swagger, and API gateways is highly desirable.API and Service Integration:
Build and maintain APIs (REST and/or SOAP), working with authentication, authorization, and secure data exchange. Integrate internal and third-party APIs to facilitate service-oriented and event-driven architecture across systems.Data Transformation and Mapping:
Implement data transformation logic to convert between formats like JSON, XML, and CSV. Design reusable components and mappings to streamline data flow between systems with different schemas or protocols.Testing and Debugging:
Perform unit, integration, and end-to-end testing of integration workflows and APIs. Debug issues using tools such as Fiddler, Postman, and application logs. Continuously optimize performance and reliability through code refactoring and system tuning.Documentation and Reporting:
Document API contracts, integration configurations, and solution architecture to support maintainability. Provide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycle.Collaboration and Communication:
Work closely with software developers, data engineers, QA teams, and business analysts to align integration work with broader project goals. Clearly communicate technical designs, project updates, and roadblocks to both technical and non-technical stakeholders.

Continuous Learning:
Keep up-to-date with integration frameworks, cloud technologies, and development best practices. Actively participate in knowledge-sharing sessions and contribute to the continuous improvement of integration standards and code quality

Preffred candiadte should be from

HM Revenue & Customs (HMRC)Department for Work and Pensions (DWP)Home OfficeMinistry of Defence (MOD)Ministry of Justice (MOJ)HM TreasuryDepartment 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)Foreign, Commonwealth & Development Office (FCDO)

GCS is acting as an Employment Business in relation to this vacancy.

Read less
£600.00 - £650.00
Per day

Exeter, England, United KingdomContract

.Net Integration Developer (SC Cleared)
Added 01/09/2026
Reference: 987567_1788256748

ROLE PURPOSEAs an Integration Developer, your primary responsibility is to design, develop, and maintain data integration solutions that... Read more

ROLE PURPOSE

As an Integration Developer, your primary responsibility is to design, develop, and maintain data integration solutions that enable seamless communication and data exchange between disparate systems. You will collaborate with stakeholders to understand integration requirements, design integration workflows, and implement scalable and robust solutions. A strong emphasis will be placed on development experience, especially in building and consuming APIs using C# or similar modern programming languages. Your role involves working with integration platforms, tools, and technologies to ensure the reliable and efficient flow of data across the organization.

PRINCIPAL ACCOUNTABILITIES

Integration Design:
Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows. Design data mappings, transformations, APIs, and message schemas to facilitate the secure and efficient exchange of data between systems.Development and Implementation:
Design, develop, test, and deploy integration solutions using C#, .NET, or similar programming languages. Build RESTful APIs and backend services to support integration needs. Configure connectors and implement robust error handling and retry mechanisms to ensure reliability and data integrity.Integration Platforms and Tools:
Utilize integration platforms such as Azure Logic Apps, Azure Data Factory, SSIS, or other middleware tools to orchestrate data flows and integrate diverse systems. Experience with tools such as Postman, Swagger, and API gateways is highly desirable.API and Service Integration:
Build and maintain APIs (REST and/or SOAP), working with authentication, authorization, and secure data exchange. Integrate internal and third-party APIs to facilitate service-oriented and event-driven architecture across systems.Data Transformation and Mapping:
Implement data transformation logic to convert between formats like JSON, XML, and CSV. Design reusable components and mappings to streamline data flow between systems with different schemas or protocols.Testing and Debugging:
Perform unit, integration, and end-to-end testing of integration workflows and APIs. Debug issues using tools such as Fiddler, Postman, and application logs. Continuously optimize performance and reliability through code refactoring and system tuning.Documentation and Reporting:
Document API contracts, integration configurations, and solution architecture to support maintainability. Provide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycle.Collaboration and Communication:
Work closely with software developers, data engineers, QA teams, and business analysts to align integration work with broader project goals. Clearly communicate technical designs, project updates, and roadblocks to both technical and non-technical stakeholders.

Continuous Learning:
Keep up-to-date with integration frameworks, cloud technologies, and development best practices. Actively participate in knowledge-sharing sessions and contribute to the continuous improvement of integration standards and code quality

GCS is acting as an Employment Business in relation to this vacancy.

Read less
£600.00 - £650.00
Per day

London, England, United KingdomContract

Integration Developer C#,.Net (SC Cleared, Public Sector)
Added 07/07/2026
Reference: 987654_1783425262

Integration Design: Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows.... Read more

Integration Design:
Collaborate with business stakeholders, IT teams, and external partners to gather integration requirements and define workflows. Design data mappings, transformations, APIs, and message schemas to facilitate the secure and efficient exchange of data between systems.Development and Implementation:
Design, develop, test, and deploy integration solutions using C#, .NET, or similar programming languages. Build RESTful APIs and backend services to support integration needs. Configure connectors and implement robust error handling and retry mechanisms to ensure reliability and data integrity.Integration Platforms and Tools:
Utilize integration platforms such as Azure Logic Apps, Azure Data Factory, SSIS, or other middleware tools to orchestrate data flows and integrate diverse systems. Experience with tools such as Postman, Swagger, and API gateways is highly desirable.API and Service Integration:
Build and maintain APIs (REST and/or SOAP), working with authentication, authorization, and secure data exchange. Integrate internal and third-party APIs to facilitate service-oriented and event-driven architecture across systems.Data Transformation and Mapping:
Implement data transformation logic to convert between formats like JSON, XML, and CSV. Design reusable components and mappings to streamline data flow between systems with different schemas or protocols.Testing and Debugging:
Perform unit, integration, and end-to-end testing of integration workflows and APIs. Debug issues using tools such as Fiddler, Postman, and application logs. Continuously optimize performance and reliability through code refactoring and system tuning.Documentation and Reporting:
Document API contracts, integration configurations, and solution architecture to support maintainability. Provide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycle.Collaboration and Communication:
Work closely with software developers, data engineers, QA teams, and business analysts to align integration work with broader project goals. Clearly communicate technical designs, project updates, and roadblocks to both technical and non-technical stakeholders.Continuous Learning:
Keep up-to-date with integration frameworks, cloud technologies, and development best practices. Actively participate in knowledge-sharing sessions and contribute to the continuous improvement of integration standards and code quality.

GCS is acting as an Employment Business in relation to this vacancy.

Read less
Negotiable

Greater London, United KingdomContractRemote

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