Middle .NET Backend Engineer ( Banking)

We’re recruiting for our technology partner, a UK bank, to hire a Middle Backend Engineer. This is a fully remote, long-term B2B contract on UK hours.

You’ll design and evolve scalable backend systems in a modern .NET ecosystem, building customer-focused platforms with onboarding workflows, orchestration, and integrations across internal and external systems in a microservices architecture.

What you will do

• Build and maintain backend APIs and services using C# and .NET
• Work within a clean architecture and microservices ecosystem (UseCases, repositories, domain entities)
• Design and implement backend workflows and REST APIs
• Write maintainable, testable, production-ready code
• Participate in code reviews and technical discussions
• Work with SQL databases, Entity Framework and transactional workflows
• Collaborate with frontend engineers on multi-step workflows and API contracts

Must-have

• 3+ years of backend engineering experience
• Strong C# and .NET
• REST APIs, Entity Framework, SQL and relational databases
• Clean or layered architecture; microservices on Azure and/or AWS
• Experience in banking, fintech or financial products, with an understanding of basic banking concepts (for example, interest rates)
• Strong problem-solving and debugging skills
• English B2 or above, able to participate in all ceremonies actively and meetings

Nice to have

• Experience with lending or savings products (strong bonus)
• CRM or onboarding platforms
• Concurrency, idem potency and workflow orchestration
• Distributed systems and cloud-native services

Work format

• Fully remote, UK working hours (Mon to Fri, 8/9:00 to 17/18:00 UK time)
• UK or Portugal based is ideal; other EU countries are possible with commitment to the UK time zone
• B2B contract, no fixed end date