Senior .NET Developer (Contract)

Ocho People; Belfast City District; Hybrid; GBP 77,490 - 88,560; Part time

Job summary

Ocho People is seeking a Senior .NET Developer for a 12-month contract based in Belfast with 90% remote work. The role focuses on enterprise-scale platforms using C#, .NET Core and Azure.

The candidate will work with senior engineers and product owners, delivering robust back-end services and cloud-native solutions on Azure.

Qualifications

• 5+ years' experience developing with C# and .NET Core.
• Proven delivery of enterprise-scale platforms.
• Strong experience with Azure cloud services.
• Knowledge of RESTful APIs and microservices architecture.
• Right to work in the UK; Belfast-based on-site days.
• Available for an immediate start.

Responsibilities

• Design and build scalable backend services using C# and .NET Core.
• Lead technical delivery on enterprise platform components.
• Collaborate with architects on solution design.
• Maintain code quality through testing and reviews.
• Develop cloud-native services on Azure and fix production issues.
• Mentor junior developers and translate requirements into solutions.

Skills

C# .NET Core

Azure cloud services

RESTful APIs & microservices

Enterprise-scale platforms

Right to work in UK / Belfast travel

Immediate start

Job description

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

About the Company

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.

The Role

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.

Key Responsibilities

• 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

What You'll Need

Essential:

• 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

Desirable / Nice to Have:

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

Why Apply?

• £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

Next Steps

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