Senior .NET Developer

Senior .NET Developer (Contract) At a Glance

• Senior .NET Developer, 12 month contract, outside IR35
• £450 per day, immediate start available
• Based in Belfast, 90% remote working
• Enterprise-scale platform build using C#, .NET Core and Azure
• Genuine autonomy on a high-visibility, technically demanding programme

Our client is a large, established organisation delivering critical digital platforms at enterprise scale. They operate across multiple regions and support a substantial user base, with a technology function that is investing heavily in modernising its core systems. The engineering culture is collaborative and delivery-focused, with a strong track record of retaining contractors on long-term engagements.

This is a senior-level contract role for an experienced .NET developer to join a team working on enterprise-scale platforms. You will work alongside senior engineers, architects and product owners to deliver robust, scalable solutions on a 12 month engagement. The role suits someone comfortable operating with minimal oversight, able to make sound technical decisions and confident contributing to architecture as well as hands‑on delivery.

• Design and build scalable backend services using C# and .NET Core
• Lead technical delivery on key components of the enterprise platform
• Collaborate with architects to shape solution design and technical direction
• Own code quality through testing, code review and sound engineering practice
• Build and maintain cloud‑native services deployed on Azure
• Troubleshoot and resolve complex production issues across the platform
• Mentor less experienced developers within the team
• Work closely with product owners to translate requirements into technical solutions

• 5+ years' experience developing with C# and .NET Core
• Proven experience delivering enterprise-scale platforms or systems
• Strong experience with Azure cloud services
• Solid grasp of RESTful API design and microservices architecture
• Right to work in the UK, based in or able to travel to Belfast for on‑site days
• Available for an immediate start

• Experience with event‑driven or message‑based architectures (e.g. Service Bus, Kafka)
• Exposure to Azure Dev Ops and CI/CD pipeline management

• £450 per day, outside IR35
• 12 month contract with strong likelihood of extension
• 90% remote working, with only occasional time on‑site in Belfast
• Immediate start available
• Work on a genuinely enterprise‑scale platform with real technical challenge
• Collaborative, senior engineering team with autonomy to make technical decisions

If this sounds like your next contract, get in touch with Aaron Somers at or connect on Linked In to find out more.