Senior Dotnet Developer

Senior Software Engineer | .NET | AWS | Kafka | London | Hybrid | £110-£120k We're partnering with a high-growth Series B SaaS business that's transforming regulatory technology through a modern, cloud-native platform. As part of a major re-platforming initiative, they're looking for a Senior Software Engineer to help build the next generation of their core products using .NET, AWS, Kafka, and modern software architecture. This is an opportunity to join a collaborative engineering team where you'll have real ownership, work with the latest technologies, and help shape the future of a rapidly scaling platform. Working alongside Product, DevOps, Data Engineering, QA, and Regulatory teams, you'll deliver high-quality software that powers mission-critical services for global financial institutions. What You'll Be Doing

• Building scalable backend services using C# and .NET
• Developing within an event-driven architecture using Kafka
• Writing clean, maintainable, well-tested code
• Participating in code reviews and driving engineering best practices
• Building resilient, observable, cloud-native services on AWS
• Using AI-assisted development tools to improve delivery and code quality
• Collaborating across engineering and product teams to solve complex technical challenges What We're Looking For
• Strong commercial experience with C# and .NET
• Experience building event-driven, service-based applications
• Knowledge of DDD and modern software architecture
• Strong engineering fundamentals including testing, CI/CD and observability
• Hands-on experience with AWS
• Experience using AI development tools such as Copilot, Claude Code or Codex
• A proactive mindset with ownership of delivery and software quality Nice to Have
• Experience modernising legacy platforms
• FinTech, RegTech or other regulated industry experience
• Experience with large-scale SaaS platforms Why Apply?
• Join a fast-growing, private equity-backed SaaS business
• Play a key role in a major platform transformation
• Work in an engineering team actively embracing AI-assisted development
• Excellent opportunities for progression in a collaborative, high-performing environment
• Flexible hybrid working, strong benefits, and a culture focused on ownership, innovation and continuous improvement Senior Software Engineer | .NET | AWS | Kafka | London | Hybrid | £110-£120k