KDR Talent Solutions
Dotnet Developer
Get notified of more jobs like this · No spam, ever
How your CV stacks up
Upload your CV to see how well it fits this job role
?%
Senior.NET Developer (Financial Services) – Contract (Outside IR35)
Role
Senior.NET Engineer
Engagement
Contract (Outside IR35 – deliverables-focused, SDS provided)
Duration
6 Months initial (scope for extension)
Location
Hybrid – Leeds City Centre (2 days per week onsite, 3 days remote)
Day Rate
up to £425/day (depending on depth of payments/cloud experience)
Start Date
Immediate
Project Overview
We are seeking a senior, deeply hands-on .NET Developer to join a critical, fast-moving payments resilience programme.
In this contract, you will help design and build a brand-new, Azure-hosted payment capability from the ground up. The platform handles mission-critical payment processing, resilient downstream communication, automated recovery, and robust reconciliation. We need a pragmatic technical contractor who takes direct ownership of work streams, works closely with Architecture, Security, Cloud/DevOps, and QA, and moves swiftly from design whiteboard into production-grade C# code.
Key Deliverables & Outcomes
- Architect, build, and deploy new transactional APIs and resilient worker services using modern C# and ASP.NET Core.
- Engineer robust resilience mechanisms, including idempotency keys, duplicate-payment prevention, automated retries, circuit breakers, and dead-letter handling.
- Build backend workflows for end-of-day and real-time transaction reconciliation with external payment gateways and banking networks.
- Implement strict security best practices, configuring OAuth 2.0 / OpenID Connect, JWT validation, Azure Key Vault, and Managed Identities.
- Containerize services using Docker and target modern hosting infrastructure (Azure Container Apps / AKS).
- Configure observability, tracing, and operational alerting across transactional boundaries using Azure Application Insights and OpenTelemetry.
- Maintain rigorous test coverage through comprehensive unit, integration, and contract testing.
Reasons to use Rodeo
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.
It 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.
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.
Required Experience & Technical Skills
- Core.NET: Deep expertise in modern C# / ASP.NET Core, asynchronous programming, clean DI patterns, and SOLID engineering fundamentals.
- Resilient Systems: Proven track record tackling the complexities of transactional systems: distributed state, concurrency, idempotency, retry policies, and fault recovery.
- Data Persistence: Advanced Entity Framework Core and SQL Server / Azure SQL skills (schema design, index optimization, distributed locking, transactional integrity).
- Modern Azure Stack: Hands-on experience with:
- Docker / Containerized microservices
- Azure Container Apps (or App Services / AKS)
- Azure Key Vault & Managed Identity (secure, secretless architecture)
- Azure Application Insights / structured distributed tracing
- Identity & Security: Solid understanding of OAuth 2.0, OpenID Connect, and token-based API security.
- Testing & Quality: Practical experience writing effective unit and integration tests (e.g., xUnit, Testcontainers, WireMock/Moq) within automated CI/CD pipelines.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
Highly Desirable
- Direct domain experience in Payments, Fintech, Core Banking, or High-Volume Transaction Processing.
- Familiarity with message brokers/event streaming (Azure Service Bus, Event Hubs, or Kafka).
- Exposure to modern front-end frameworks (specifically React) for administrative/monitoring tooling.
Working Arrangements & Selection Process
Working Pattern
Hybrid working — 2 days per week onsite in their Leeds City Centre office (short walk from Leeds Station), with 3 days remote.
Interview Process
A concise, contractor-friendly process focused on direct technical contribution. We want to discuss systems you have personally designed, written, and debugged rather than high-level team management. Shortlisted candidates may be asked to complete a focused practical coding exercise.
To Apply
Please submit your current CV detailing recent payments/high-resilience .NET projects, your limited company status, and your availability.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
Location