C#.NET Core Backend Engineer

C#.NET Core Backend Engineer | Greenfield Payments Platform | £130,000 + Bonus + Benefits | Hybrid (London) Read on to fully understand what this job requires in terms of skills and experience If you are a good match, make an application.

Join a brand-new Payments Engineering team within a leading financial group as they build a modern, event-driven payments platform completely from scratch.

As a Backend C#.NET Core Engineer, you'll be part of a small, high-impact team designing scalable, reliable services that power real-time payment flows, settlements, and reconciliations across the business. This is a greenfield project with plenty of ownership and visibility from day one.

What You'll Be Doing

• Designing and developing C#.NET Core microservices and APIs for payments, settlements, and orchestration
• Building event-driven components with Kafka, RabbitMQ, or Azure Service Bus for real-time processing
• Owning system performance, reliability, and scalability - including monitoring, tuning, and fault tolerance
• Collaborating with Product, Platform, and Security teams to build compliant, scalable payment systems
• Driving engineering excellence - CI/CD, testing, observability, and automation across the stack

Tech Stack

• C#.NET Core, REST/gRPC, microservices architecture
• Kafka, RabbitMQ, or Azure Service Bus (event-driven systems)
• Azure / AWS, Docker / Kubernetes, IaC, CI/CD (Azure DevOps, GitHub Actions)
• SQL Server / PostgreSQL, caching / NoSQL experience welcome
• xUnit / NUnit, contract testing, OpenTelemetry, Grafana / Prometheus, ELK Stack

• Strong backend engineering experience using C#.NET Core
• Solid knowledge of event-driven architectures and message brokers (Kafka, RabbitMQ, etc.)
• Deep understanding of distributed systems, scalability, and resilience
• Background in payments, fintech, or other high-throughput, regulated environments is a big plus
• Self-starter who enjoys autonomy, collaboration, and greenfield problem-solving

• £130,000 base salary + strong bonus + excellent benefits
• Hybrid working - typically 3 days per week in the London office
• Join a brand-new Payments team with huge impact and full technical ownership
• Great culture with collaboration, innovation, and genuine career growth

Interested?