C# .NET Integration Engineer - API & Azure Specialist

GCS; Exeter; On-site; GBP 60,000 - 90,000; Full time

Job summary

GCS in the United Kingdom is seeking an Integration specialist to design, build, test and maintain integration solutions and APIs across systems.

You will collaborate with business and IT teams, implement data transformations, REST and SOAP services, and apply best practices for security, reliability, and documentation. The role uses Azure Logic Apps, Azure Data Factory and other middleware tools.

Qualifications

• Experience designing and implementing integration solutions.
• Experience building RESTful APIs and backend services.
• Experience with integration platforms and middleware.
• Experience with API tooling (Postman, Swagger).
• Experience with REST/SOAP APIs and secure data exchange.
• Ability to coordinate with multiple stakeholders.
• Preferred candidates from HMRC, DWP, Home Office, MOD, MOJ, HM Treasury, or other government departments.

Responsibilities

• 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 support secure and efficient data exchange between systems.
• Design, develop, test, and deploy integration solutions.
• Build RESTful APIs and backend services to support integration needs.
• Configure connectors and implement error handling and retry mechanisms to ensure reliability and data integrity.
• Orchestrate data flows and integrate diverse systems using integration platforms and middleware tools.
• Build and maintain APIs, including REST and SOAP services.
• Integrate internal and third-party APIs to support service-oriented and event-driven architecture across systems.
• Implement data transformation logic between different formats and schemas.
• Perform unit, integration, and end-to-end testing of integration workflows and APIs.
• Document API contracts, integration configurations, and solution architecture.
• Provide progress updates, technical summaries, and risk reports to stakeholders throughout the project lifecycle.

Skills

Integration design

RESTful API design

Stakeholder collaboration

Communication

Testing

Documentation

Problem solving

Tools

Azure Logic Apps

Azure Data Factory

SSIS

Postman

Swagger

API gateways

Fiddler

JSON

XML

SOAP

REST

ASP.NET

C#

Job description

GCS in the United Kingdom is seeking an Integration specialist to design, build, test and maintain integration solutions and APIs across systems.

You will collaborate with business and IT teams, implement data transformations, REST and SOAP services, and apply best practices for security, reliability, and documentation. The role uses Azure Logic Apps, Azure Data Factory and other middleware tools.