Senior .NET Developer - £650-£700 per day (Inside IR35) Hybrid, Manchester (2-3 days/week)Start: ASAP Energy Sector My client is looking for an experienced Senior .NET Developer to support and enhance a complex application estate. This is a backend-heavy role working across data models, systems integration, APIs, and migrations. You''ll take ownership of business-critical systems and must be able to hit the ground running from day one. Key Skills C# / .NET Core (10+ years)Azure (Functions, Web Apps, DevOps, CI/CD)SQL Server, data modelling, schema migrationsEF Core (code-first, migrations)REST APIs, microservices, resilience patternsCI/CD: YAML pipelines, Terraform, Git Nice to Have RabbitMQ / Azure Service BusReact or AngularETL / data integrationTDD / automation What We''re Looking For Strong self-starter, able to deliver quicklyExperience with complex data systemsEnergy/utilities background (highly desirable)Strong communicator and technical leader Working Model Hybrid: Manchester HQ, 2-3 days/weekAgile/Scrum, modern Azure-native tooling Guidant, Carbon60, Lorien and SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.