MRJ Recruitment
Senior .NET Developer

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Senior.NET Developer
£65,000
Permanent
MRJ have partnered with one of the UK's leading technology businesses as they continue to invest in their engineering capability following the successful migration to their own proprietary platform.
The Role
We're looking for an experienced Senior.NET Developer who enjoys solving complex engineering challenges and delivering high-quality software within a modern Agile environment.
You'll work across the full software development lifecycle, building scalable backend services, APIs and integrations while collaborating closely with Product, QA and Platform Engineering teams. This is a hands-on engineering role where you'll have ownership of features from design through to production, contributing to engineering standards, platform improvements and continuous delivery practices.
Key Responsibilities
- Design, develop and maintain scalable applications using C# and .NET.
- Deliver new features and enhancements across a large-scale customer platform.
- Build and maintain RESTful APIs, backend services and third-party integrations.
- Write clean, reusable and maintainable code following engineering best practices.
- Own developments from initial design through to production deployment and ongoing support.
- Collaborate closely with Product Managers, QA Engineers and Platform teams throughout the delivery lifecycle.
- Contribute to the evolution of CI/CD pipelines and development automation.
- Ensure solutions are fully testable through unit, integration and performance testing.
- Optimise application performance across SQL and NoSQL environments.
- Support continuous improvements across architecture, engineering standards and development processes.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
Start with a chat, not a search bar
Grad scheme, placement, apprenticeship? Not sure what you want yet — that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.
Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
See breakdownIt searches the market for you
Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.
Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
Person Requirements
- Significant commercial experience developing applications with C# and .NET.
- Strong understanding of Object-Oriented Programming principles and software design patterns.
- Experience building Web APIs, Web Services and distributed applications.
- Experience working with SQL and NoSQL databases.
- Knowledge of N-Tier Architecture and service-oriented design.
- Experience using Git within collaborative development teams.
- Experience working within Agile or Kanban delivery environments.
- Strong understanding of software architecture and engineering best practice.
- Excellent problem-solving skills with a proactive approach to delivery.
- Strong communication skills with the ability to collaborate across technical and non-technical teams.


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Desirable Experience
- Experience with WinForms or WPF.
- Experience working within betting, gaming or other high-volume transactional environments.
- Previous ownership of a product, platform or subsystem.
- Exposure to Microsoft Orleans, Windows Services, messaging platforms or caching technologies.
Tech Stack
C# | .NET | SQL | NoSQL | Web API | WCF | Microsoft Orleans | Git | Windows Services | CI/CD | Agile
Next Steps
If you're a.NET Developer who enjoys building scalable software, solving complex technical challenges and working on products used by millions of customers, we'd love to hear from you.
Apply today or get in touch with the MRJ team for a confidential conversation.
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Jessica, London
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